CN112225485A - Nucleating agent, copper tailing autoclaved aerated concrete product, preparation method and application - Google Patents
Nucleating agent, copper tailing autoclaved aerated concrete product, preparation method and application Download PDFInfo
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- CN112225485A CN112225485A CN202011078575.7A CN202011078575A CN112225485A CN 112225485 A CN112225485 A CN 112225485A CN 202011078575 A CN202011078575 A CN 202011078575A CN 112225485 A CN112225485 A CN 112225485A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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Abstract
The invention relates to the technical field of building materials, and particularly discloses a crystal nucleating agent, a copper tailing autoclaved aerated concrete product, a preparation method and application, wherein the crystal nucleating agent comprises the following raw materials: blast furnace slag, nano calcium carbonate, fly ash, needle-shaped wollastonite powder, polycarboxylic acid, triterpenoid saponin and sodium silicate. The crystal nucleus agent provided by the invention can be used for preparing the autoclaved aerated concrete block by using the characteristics of early strengthening and inducing the crystallization of tobermorite, and by generating enough tobermorite to be interpenetrated in CSH gel, the compressive strength is effectively improved, the shrinkage of a product is reduced, the dry density is low, and the problems of low compressive strength, high volume weight and large shrinkage of a product produced when the autoclaved aerated concrete block is prepared by using copper tailings as a raw material in the prior art are solved; the provided preparation method is simple, can quickly and efficiently prepare the crystal nucleating agent, and has wide market prospect.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a nucleating agent and copper tailing autoclaved aerated concrete product, a preparation method and application.
Background
With the continuous development of science and technology, the attention degree of people to environmental problems is also continuously improved. Among them, copper tailings (waste residues) are also called copper tailings, which are composed of fine sand particles left after the ore is crushed and selected, and if not processed in time, environmental problems are easily caused.
Generally, besides a small amount of copper tailings serving as fillers of old mines, most of the copper tailings are treated in a stacking mode, so that a large amount of land is occupied, the ecological environment is easily polluted, and contained heavy metal ions are easily infiltrated into underground water and river water to harm the health of people.
At present, in the prior art, there is a copper tailing treatment method for preparing an autoclaved aerated concrete block by using copper tailings as a raw material, but the above technical scheme has the following defects in actual use: because the content of silicon dioxide in the copper tailings is lower than that of natural river sand, most of the silicon dioxide is 70 wt% or less, and the water demand is higher than that of the natural river sand, when the copper tailings are used as raw materials to prepare the autoclaved aerated concrete block, the effective components participating in hydrothermal synthesis are low, the water-to-gel ratio is higher, and for products produced by using the copper tailings as siliceous raw materials of the autoclaved aerated concrete block with large mixing amount, the problems of lower compressive strength, higher volume weight, larger shrinkage and the like exist.
Disclosure of Invention
The embodiment of the invention aims to provide a crystal nucleating agent to solve the problems of low compressive strength, high volume weight and large shrinkage of a product produced by using copper tailings as a raw material to prepare an autoclaved aerated concrete block in the prior art.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the crystal nucleating agent comprises the following raw materials in parts by weight: 10-30 parts of (ground) blast furnace slag, 8-22 parts of nano calcium carbonate, 12-36 parts of fly ash, 25-65 parts of needle-shaped wollastonite powder, 1-5 parts of polycarboxylic acid (water reducing agent), 0.01-0.05 part of triterpenoid saponin and 1-6 parts of sodium silicate.
As a further scheme of the invention: the crystal nucleus agent comprises the following raw materials in parts by weight: 15-25 parts of (ground) blast furnace slag, 10-20 parts of nano calcium carbonate, 15-35 parts of fly ash, 30-60 parts of needle-shaped wollastonite powder, 1-3 parts of polycarboxylic acid (water reducing agent), 0.01-0.03 part of triterpenoid saponin and 1-5 parts of sodium silicate.
Another object of an embodiment of the present invention is to provide a method for preparing a crystal nucleating agent, including the following steps:
1) weighing (grinding) blast furnace slag, nano calcium carbonate, fly ash, polycarboxylic acid (water reducing agent) and triterpenoid saponin according to a proportion, and uniformly mixing to obtain a mixture;
2) weighing the needle-shaped wollastonite powder and the sodium silicate according to the proportion, adding the needle-shaped wollastonite powder and the sodium silicate into the mixture obtained in the step 1), and uniformly mixing to obtain the nucleating agent.
Another object of the embodiments of the present invention is to provide a crystal nucleating agent prepared by the above method.
The embodiment of the invention also aims to provide a copper tailing autoclaved aerated concrete product, which is prepared by adopting the nucleating agent as a reinforcing agent.
Another object of the embodiments of the present invention is to provide an application of the crystal nucleating agent in the processing of concrete products.
The embodiment of the invention also aims to provide an application of the copper tailing autoclaved aerated concrete product in building construction.
Compared with the prior art, the invention has the beneficial effects that:
the crystal nucleus agent provided by the embodiment of the invention is particularly suitable for preparing the autoclaved aerated concrete block based on the copper tailings, can be used as a reinforcing agent to induce CSH gel to be quickly converted into tobermorite in the preparation process of the autoclaved aerated concrete block by utilizing the characteristics of early strengthening and crystallization induction of the tobermorite of the crystal nucleus agent, further can prepare the autoclaved aerated concrete block by mixing a large amount of copper tailing waste residues, can make up the defect of insufficient silicon dioxide content, can produce enough tobermorite to be penetrated in the CSH gel, effectively improves the compressive strength of a product, reduces the shrinkage of the product, has low dry density, effectively improves the utilization rate of the copper tailings, reduces the environmental pollution, and solves the problems that the product produced by using the copper tailings as a raw material to prepare the autoclaved aerated concrete block in the prior art has low compressive strength, high volume weight, low cost and the like, The problem of large shrinkage; the provided preparation method is simple, can quickly and efficiently prepare the crystal nucleating agent, and has wide market prospect.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The nucleating agent provided by the embodiment of the invention comprises the following raw materials in parts by weight: 10-30 parts of (ground) blast furnace slag, 8-22 parts of nano calcium carbonate, 12-36 parts of fly ash, 25-65 parts of needle-shaped wollastonite powder, 1-5 parts of polycarboxylic acid (water reducing agent), 0.01-0.05 part of triterpenoid saponin and 1-6 parts of sodium silicate.
As another preferred embodiment of the present invention, the crystal nucleus agent comprises the following raw materials in parts by weight: 15-25 parts of (ground) blast furnace slag, 10-20 parts of nano calcium carbonate, 15-35 parts of fly ash, 30-60 parts of needle-shaped wollastonite powder, 1-3 parts of polycarboxylic acid (water reducing agent), 0.01-0.03 part of triterpenoid saponin and 1-5 parts of sodium silicate.
Preferably, the crystal nucleus agent comprises the following raw materials in parts by weight: 20 parts of (ground) blast furnace slag, 15 parts of nano calcium carbonate, 25 parts of fly ash, 45 parts of needle-shaped wollastonite powder, 2 parts of polycarboxylic acid (water reducing agent), 0.02 part of triterpenoid saponin and 3 parts of sodium silicate.
The crystal nucleus agent provided by the embodiment of the invention is particularly suitable for preparing the autoclaved aerated concrete block based on the copper tailings, and can be used as a reinforcing agent to induce CSH gel to be quickly converted into tobermorite in the preparation process of the autoclaved aerated concrete block by utilizing the characteristics of early reinforcement and induction of crystallization of tobermorite, so that the autoclaved aerated concrete block can be prepared by carrying out large-dosage copper tailing waste residues; by adding the crystal nucleus agent product, the water-gel ratio of the copper tailings autoclaved aerated concrete can be reduced, the formation of early CSH gel is promoted, the CSH gel is induced to be rapidly converted to tobermorite, the defects that the content of silicon dioxide in the copper tailings is insufficient, the effective components participating in hydrothermal synthesis are low, the water-gel ratio is large, and the product produced by using the copper tailings as siliceous raw materials of the autoclaved aerated concrete block with large doping amount has the problems of low compressive strength, high volume weight, large shrinkage and the like when the copper tailings are used as raw materials to prepare the autoclaved aerated concrete block can be overcome, meanwhile, the utilization rate of the copper tailings is effectively improved, the environmental pollution is reduced, and the problems of low compressive strength, high volume weight and large shrinkage of products produced by using the copper tailings as a raw material to prepare the autoclaved aerated concrete block in the prior art are solved.
As another preferred embodiment of the present invention, the (ground) blast furnace slag is a product of grinding granulated blast furnace slag having a specific surface area of more than 100m2Per kg; the granulated blast furnace slag is a raw material for producing cement, and specifically is granulated blast furnace slag obtained by quenching and granulating a melt which is obtained by smelting pig iron in a blast furnace and contains silicate and aluminosilicate as main components.
As another preferred embodiment of the invention, the fly ash is class I fly ash, and the class I fly ash is fly ash with the fineness of not more than 12.0%, the water demand of not more than 95% and the loss on ignition of not more than 5.0%.
As another preferred embodiment of the present invention, the crystal nucleating agent can induce the rapid conversion of CSH gel into tobermorite.
As another preferred embodiment of the present invention, the CSH gel (hydrated calcium silicate) is a C-S-H gel that is a product of a hydration reaction of cement during hydration of portland cement.
The embodiment of the invention also provides a preparation method of the crystal nucleating agent, which comprises the following steps:
1) weighing (grinding) blast furnace slag, nano calcium carbonate, fly ash, polycarboxylic acid (water reducing agent) and triterpenoid saponin according to a proportion, and uniformly mixing to obtain a mixture;
2) weighing the needle-shaped wollastonite powder and the sodium silicate according to the proportion, adding the needle-shaped wollastonite powder and the sodium silicate into the mixture obtained in the step 1), and uniformly mixing to obtain the nucleating agent.
Preferably, the preparation method of the crystal nucleus agent comprises the following steps:
1) weighing (grinding) blast furnace slag, nano calcium carbonate, fly ash, polycarboxylic acid (water reducing agent) and triterpenoid saponin according to a proportion, and stirring for 2-3 minutes by using a stirrer to obtain a mixture;
2) weighing the needle-shaped wollastonite powder and the sodium silicate according to the proportion, adding the needle-shaped wollastonite powder and the sodium silicate into the mixture obtained in the step 1), and continuously stirring for 2-3 minutes to obtain the nucleating agent, wherein the nucleating agent can be packaged and applied.
The embodiment of the invention also provides the crystal nucleating agent prepared by the preparation method of the crystal nucleating agent.
The embodiment of the invention also provides a copper tailing autoclaved aerated concrete product, which adopts the crystal nucleating agent as a reinforcing agent so as to induce the CSH gel to be quickly converted into tobermorite during the preparation of the copper tailing autoclaved aerated concrete product.
As another preferred embodiment of the invention, the copper tailing autoclaved aerated concrete product comprises the following raw materials in parts by weight: 1-2 parts of the nucleating agent, 10-20 parts of ordinary portland cement, 15-20 parts of (ground) quicklime powder, 3-4 parts of dihydrate gypsum, 50-60 parts of copper tailings and 10-20 parts of river sand.
As another preferred embodiment of the present invention, the portland cement is selected from any one of portland cements with strength grades 42.5, 42.5R, 52.5 and 52.5R.
Preferably, the Portland cement is a 42.5 grade (strength grade) Portland cement.
As another preferred embodiment of the present invention, the (ground) quicklime powder is a powdery material obtained by grinding blocky quicklime with appropriate duration, and may be an existing product, and is specifically selected according to the requirement, and is not limited herein.
The embodiment of the invention also provides a preparation method of the copper tailing autoclaved aerated concrete product, which comprises the following steps: weighing 42.5-grade (strength grade) ordinary portland cement, (finely ground) quicklime powder, dihydrate gypsum, copper tailings, river sand and the nucleating agent as main raw materials according to a proportion, adding a proper amount of a gas former, a regulator and a bubble stabilizer, and carrying out processes of burdening, stirring, pouring, standing, cutting, high-pressure steam curing and the like to obtain the copper tailing autoclaved aerated concrete product.
As another preferred embodiment of the present invention, the copper tailing autoclaved aerated concrete product may specifically be a copper tailing autoclaved aerated concrete block, that is, the preparation method may be the same as that of a conventional production process (generally, the autoclaved aerated concrete block is a porous concrete product prepared by using fly ash, lime, cement, gypsum, slag and the like as main raw materials, adding a proper amount of a gas former, a regulator and a bubble stabilizer, and performing processes of blending, stirring, pouring, standing, cutting, high-pressure steam curing and the like), and the nucleating agent is added along with powder such as ordinary portland cement, and is not described herein again.
The embodiment of the invention also provides application of the crystal nucleating agent in processing of concrete products. Specifically, the concrete block can be used for preparing products made of concrete (including mortar) as a basic material, such as aerated concrete blocks, autoclaved aerated concrete blocks, concrete solid bricks, concrete porous bricks, environment-friendly permeable pavement bricks, antique blue bricks, building heat-insulation integrated modules, multi-prevention inspection well covers, two-layer well covers, antiskid steps, safety rainwater well grates, linear drainage U-shaped grooves (narrow grate rainwater openings), light foamed concrete, road anti-collision citron heads, four-prevention exclusion sealing covers, concrete hanging plates, concrete floors, concrete bricks and the like. The crystal nucleating agent is particularly suitable for autoclaved aerated concrete blocks based on copper tailings, and by utilizing the characteristics of early strengthening and inducing crystallization of tobermorite, the autoclaved aerated concrete can be prepared by using large-amount copper tailing waste residues, so that the utilization rate of the copper tailings is effectively improved, and the environmental pollution is reduced.
The embodiment of the invention also provides application of the copper tailing autoclaved aerated concrete product in building construction.
The technical effects of the crystal nucleus agent of the present invention will be further described below by referring to specific examples.
Example 1
A preparation method of a crystal nucleus agent comprises the following steps:
weighing (grinding) 10 kg of blast furnace slag, 8 kg of nano calcium carbonate, 12 kg of fly ash, 1 kg of polycarboxylic acid (water reducing agent) and 0.01 kg of triterpenoid saponin, and stirring for 2 minutes by using a stirrer to obtain a mixture;
2) weighing 25kg of needle-shaped wollastonite powder and 1 kg of sodium silicate, adding the needle-shaped wollastonite powder and the sodium silicate into the mixture obtained in the step 1), and continuously stirring for 2 minutes to obtain the nucleating agent, wherein the nucleating agent can be packaged and applied.
Example 2
A preparation method of a crystal nucleus agent comprises the following steps:
weighing (grinding) 30 kg of blast furnace slag, 22 kg of nano calcium carbonate, 36 kg of fly ash, 5kg of polycarboxylic acid (water reducing agent) and 0.05 kg of triterpenoid saponin, and stirring for 3 minutes by using a stirrer to obtain a mixture;
2) weighing 65 kg of needle-shaped wollastonite powder and 6 kg of sodium silicate, adding the needle-shaped wollastonite powder and the sodium silicate into the mixture obtained in the step 1), and continuously stirring for 3 minutes to obtain the nucleating agent, wherein the nucleating agent can be packaged and applied.
Example 3
A preparation method of a crystal nucleus agent comprises the following steps:
weighing (grinding) 20 kg of blast furnace slag, 20 kg of nano calcium carbonate, 30 kg of fly ash, 1 kg of polycarboxylic acid (water reducing agent) and 0.04 kg of triterpenoid saponin, and stirring for 2-3 minutes by using a stirrer to obtain a mixture;
2) weighing 45 kg of needle-shaped wollastonite powder and 3 kg of sodium silicate, adding the needle-shaped wollastonite powder and the sodium silicate into the mixture obtained in the step 1), and continuously stirring for 2-3 minutes to obtain the nucleating agent, wherein the nucleating agent can be packaged and applied.
Example 4
A preparation method of a crystal nucleus agent comprises the following steps:
weighing (grinding) 15-25 kg of blast furnace slag, 10-20 kg of nano calcium carbonate, 15-35 kg of I-grade fly ash, 1-3 kg of polycarboxylic acid (water reducing agent) and 0.01-0.03 kg of triterpenoid saponin, and stirring for 2-3 minutes by using a stirrer to obtain a mixture;
2) weighing 30-60 kg of needle-shaped wollastonite powder and 1-5 kg of sodium silicate, adding into the mixture obtained in the step 1), and continuously stirring for 2-3 minutes to obtain the nucleating agent, wherein the nucleating agent can be packaged and applied.
Example 5
A preparation method of a crystal nucleus agent comprises the following steps:
weighing (grinding) 15 kg of blast furnace slag, 10 kg of nano calcium carbonate, 15 kg of fly ash, 1 kg of polycarboxylic acid (water reducing agent) and 0.01 kg of triterpenoid saponin, and stirring for 3 minutes by using a stirrer to obtain a mixture;
2) weighing 30 kg of needle-shaped wollastonite powder and 1 kg of sodium silicate, adding the needle-shaped wollastonite powder and the sodium silicate into the mixture obtained in the step 1), and continuously stirring for 3 minutes to obtain the nucleating agent, wherein the nucleating agent can be packaged and applied.
Example 6
A preparation method of a crystal nucleus agent comprises the following steps:
weighing (grinding) 25kg of blast furnace slag, 20 kg of nano calcium carbonate, 35 kg of fly ash, 3 kg of polycarboxylic acid (water reducing agent) and 0.03 kg of triterpenoid saponin, and stirring for 3 minutes by using a stirrer to obtain a mixture;
2) 60 kg of needle-shaped wollastonite powder and 5kg of sodium silicate are weighed and added into the mixture obtained in the step 1), and the mixture is continuously stirred for 3 minutes to obtain the crystal nucleating agent, and the crystal nucleating agent can be packaged and applied.
Example 7
A preparation method of a crystal nucleus agent comprises the following steps:
weighing (grinding) 20 kg of blast furnace slag, 15 kg of nano calcium carbonate, 25kg of grade I fly ash, 2 kg of polycarboxylic acid (water reducing agent) and 0.02 kg of triterpenoid saponin, and stirring for 2.5 minutes by using a stirrer to obtain a mixture;
2) weighing 45 kg of needle-shaped wollastonite powder and 3 kg of sodium silicate, adding the needle-shaped wollastonite powder and the sodium silicate into the mixture obtained in the step 1), and continuously stirring for 2.5 minutes to obtain the nucleating agent, wherein the nucleating agent can be packaged and applied.
Example 8
A copper tailing autoclaved aerated concrete product comprises the following raw materials: 1 kg of the crystal nucleus agent prepared in example 7, 10 kg of ordinary portland cement, (ground) 15 kg of quicklime powder, 3 kg of dihydrate gypsum, 50 kg of copper tailings, and 10 kg of river sand; wherein the Portland cement is selected from Portland cements with the index of 42.5 strength grade.
In the embodiment of the invention, the preparation method of the copper tailing autoclaved aerated concrete product specifically comprises the following steps: according to the conventional production process, the ordinary portland cement, (finely ground) quicklime powder, dihydrate gypsum, copper tailings, river sand and a nucleating agent are weighed as main raw materials, and a proper amount of a gas former, a regulator and a bubble stabilizer are added, and the autoclaved aerated concrete product of the copper tailings is obtained through the processes of burdening, stirring, pouring, standing, cutting, high-pressure steam curing and the like.
Example 9
A copper tailing autoclaved aerated concrete product comprises the following raw materials: 2 kg of the crystal nucleus agent prepared in example 7, 20 kg of ordinary portland cement, 20 kg of (ground) quicklime powder, 4 kg of dihydrate gypsum, 60 kg of copper tailings, and 20 kg of river sand; wherein the Portland cement is selected from Portland cements with the index of 42.5 strength grade.
In the embodiment of the invention, the preparation method of the copper tailing autoclaved aerated concrete product specifically comprises the following steps: according to the conventional production process, the ordinary portland cement, (finely ground) quicklime powder, dihydrate gypsum, copper tailings, river sand and a nucleating agent are weighed as main raw materials, and a proper amount of a gas former, a regulator and a bubble stabilizer are added, and the autoclaved aerated concrete product of the copper tailings is obtained through the processes of burdening, stirring, pouring, standing, cutting, high-pressure steam curing and the like.
Example 10
The copper tailing autoclaved aerated concrete block comprises the following raw materials: 1 kg of the crystal nucleus agent prepared in example 7, 12 kg of ordinary portland cement, (ground) 18 kg of quicklime powder, 3 kg of dihydrate gypsum, 60 kg of copper tailings, and 10 kg of river sand; wherein the Portland cement is selected from Portland cements with the index of 42.5 strength grade. The preparation method of the copper tailing autoclaved aerated concrete product refers to example 9.
Example 11
The same procedure as in example 10 was repeated, except that the amount of the crystal nucleus agent used was changed to 2 kg as compared with example 10.
Example 12
The same as example 9, except that the Portland cement is selected from Portland cement having a 42.5R strength rating, as compared to example 9.
Example 13
The same as example 9, except that the Portland cement is selected from Portland cement having a strength rating of 52.5, as compared to example 9.
Example 14
The process is the same as example 9 except that the Portland cement is selected from Portland cement having a strength rating of 52.5R as compared to example 9.
Comparative example 1
The same procedure as in example 10 was repeated, except that no nucleating agent was added to the starting materials, as compared with example 10.
Comparative example 2
An autoclaved aerated concrete block comprises the following raw materials: 12 kg of ordinary portland cement, 18 kg of (ground) quicklime powder, 3 kg of dihydrate gypsum and 70 kg of river sand; wherein the Portland cement is selected from Portland cements with the index of 42.5 strength grade.
In the embodiment of the invention, the preparation method of the autoclaved aerated concrete product specifically comprises the following steps: according to the conventional production process, the ordinary portland cement, (finely ground) quicklime powder, dihydrate gypsum and river sand are weighed as main raw materials, and a proper amount of a gas former, a regulator and a bubble stabilizer are added, and the autoclaved aerated concrete product is obtained through the processes of burdening, stirring, pouring, standing, cutting, high-pressure steam curing and the like.
Performance testing
And (3) carrying out performance detection on the block samples obtained in the examples 10-11 and the comparative examples 1-2, specifically referring to the autoclaved aerated concrete block GB11968-2006, wherein the autoclaved aerated concrete block has the following product quality requirements: a 06-grade qualified product with a dry density of not more than 625kg/m3The compression strength is more than 3.5MPa, and the shrinkage rate is not more than 0.05 percent. Specific test results are shown in table 1.
Table 1 table of performance test results
As can be seen from the data in Table 1, the autoclaved aerated concrete block product prepared by the nucleating agent provided by the invention meets the quality requirements of autoclaved aerated concrete block products in the autoclaved aerated concrete block GB 11968-2006: dry density not greater than 625kg/m3The compression strength is more than 3.5MPa, and the shrinkage rate is not more than 0.05 percent. As can be seen from comparative example 1, the dry density of the product using copper tailings as a raw material without the addition of the nucleating agent was 655kg/m3And the compressive strength and the shrinkage rate are not in accordance with the requirements, so thatThe crystal nucleus agent provided by the embodiment of the invention utilizes the characteristics of early strengthening and inducing tobermorite crystallization of the crystal nucleus agent, can be used as a reinforcing agent to induce the CSH gel to be quickly converted into tobermorite during the preparation process of the autoclaved aerated concrete block, can reduce the water-to-gel ratio of the autoclaved aerated concrete of the copper tailings, promote the formation of early CSH gel, induce the CSH gel to be quickly converted into tobermorite, can make up for the defect of insufficient silicon dioxide content, produce enough tobermorite to be inserted in CSH gel, effectively improve the compressive strength of the product, reduce the shrinkage of the product, have low dry density, the performance of the crystal nucleus agent is almost the same as that of the product completely made of natural river sand, so that the crystal nucleus agent can be used for comprehensively utilizing the copper tailings on the basis of keeping the performance of the product, the environmental pollution is reduced, and the crystal nucleus agent has wide market prospect.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. The crystal nucleus agent is characterized by comprising the following raw materials in parts by weight: 10-30 parts of blast furnace slag, 8-22 parts of nano calcium carbonate, 12-36 parts of fly ash, 25-65 parts of needle-shaped wollastonite powder, 1-5 parts of polycarboxylic acid, 0.01-0.05 part of triterpenoid saponin and 1-6 parts of sodium silicate.
2. A crystal nucleus agent as claimed in claim 1, wherein the crystal nucleus agent comprises the following raw materials by weight: 15-25 parts of blast furnace slag, 10-20 parts of nano calcium carbonate, 15-35 parts of fly ash, 30-60 parts of needle-shaped wollastonite powder, 1-3 parts of polycarboxylic acid, 0.01-0.03 part of triterpenoid saponin and 1-5 parts of sodium silicate.
3. A crystal nucleator according to claim 1 wherein the crystal nucleator induces the conversion of CSH gel to tobermorite.
4. A method for preparing a crystal nucleus agent as described in any one of claims 1 to 3, comprising the steps of:
1) weighing blast furnace slag, nano calcium carbonate, fly ash, polycarboxylic acid and triterpenoid saponin according to a proportion, and uniformly mixing to obtain a mixture;
2) and weighing the needle-shaped wollastonite powder and the sodium silicate according to the proportion, adding the needle-shaped wollastonite powder and the sodium silicate into the mixture, and uniformly mixing to obtain the nucleating agent.
5. A crystal nucleus agent prepared by the method for preparing a crystal nucleus agent as claimed in claim 4.
6. The copper tailing autoclaved aerated concrete product is characterized in that the crystal nucleating agent as claimed in claim 1, 2, 3 or 5 is used as a reinforcing agent to induce the conversion of CSH gel into tobermorite during the preparation of the copper tailing autoclaved aerated concrete product.
7. The copper tailing autoclaved aerated concrete product according to claim 6, which is characterized by comprising the following raw materials in parts by weight: 1-2 parts of a crystal nucleating agent, 10-20 parts of ordinary portland cement, 15-20 parts of quicklime powder, 3-4 parts of dihydrate gypsum, 50-60 parts of copper tailings and 10-20 parts of river sand.
8. The copper tailing autoclaved aerated concrete product according to claim 7, wherein the Portland cement is selected from any one of Portland cements with the four strength grades of 42.5, 42.5R, 52.5 and 52.5R.
9. Use of a crystal nucleating agent as claimed in claim 1 or 2 or 3 or 5 in the processing of concrete articles.
10. Use of the copper tailings autoclaved aerated concrete product of claim 6, 7 or 8 in building construction.
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| CN114163156A (en) * | 2021-12-24 | 2022-03-11 | 南京永能新材料有限公司 | Formula of copper tailings modified concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114163156A (en) * | 2021-12-24 | 2022-03-11 | 南京永能新材料有限公司 | Formula of copper tailings modified concrete and preparation method thereof |
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