JP4235318B2 - Processing method for dehydrated cake of crushed stone powder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a crushed stone dehydrated cake suitable for reusing as a resource a crushed stone dehydrated cake recovered from the wastewater treatment process by performing a wet treatment for washing the crushed stone in a quarry, a quarry or a sand quarry. It relates to the processing method.
[0002]
[Prior art]
Quarry, a large amount of crushed stone powder dehydrated cake wet processing to from the wastewater treatment profile processes such as washing the crushed stone in quarries or manufacturing Sand like occurs. The dewatered cake of crushed stone powder is sandy fine particles having an extremely fine particle size, and is easily disposed of in landfill as industrial waste because of its property of being easily muddy by rainwater or the like.
[0003]
[Problems to be solved by the invention]
However, disposal of the crushed dehydrated cake requires a large amount of processing cost, and in recent years it has been difficult to secure a disposal site itself, and there is room for reconsideration from the viewpoint of effective use of resources.
[0004]
In addition, attempts have been made to recycle as a useful construction material by adding solidification materials such as cement and lime to the crushed stone powder dehydrated cake, but the crushed stone powder dehydrated cake still contains a lot of water. However, in order to dehydrate and solidify, a considerable amount of solidifying material is required, and the cost of the solidifying material is included.
[0005]
This invention makes it a subject to provide the processing method of the crushed stone powder dehydrated cake which processes so that the crushed stone powder dehydrated cake which is an industrial waste can be effectively utilized as a low-cost resource in view of said point.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present inventors have performed a dry process using a sieve or wind power in a quarry, a quarry, etc. without performing a wet process for selecting a crushed stone. Although the crushed stone powder was generated and the crushed stone powder was used for road pavement materials, etc., it was also focused on searching for other uses, and we thought that this dried crushed stone powder could be used. Therefore, as a result of diligent research, crushed stone powder dehydrated cake, dried crushed stone powder, and solidified material were supplied to the mixer, and mixed and crushed to granulate and produce even if the amount of solidified material was reduced. It was found that the granulated material can be used as a construction material.
[0007]
Moreover, if this manufactured granulated material is compacted by rolling and crushing after hardening, it can be used more suitably as a construction material.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
According to the method for treating a crushed stone powder dehydrated cake according to the present invention, a massive crushed crushed stone powder dehydrated cake, a dried powdered crushed stone powder, and a solidifying material such as cement are supplied into a mixer. When the crushed stone powder dehydrated cake, dried crushed stone powder and solidified material are mixed and stirred in the mixer for a predetermined time, the moisture contained in the crushed stone powder dehydrated cake is dehydrated by the dried crushed stone powder, As the surface is covered with crushed stone powder, the viscosity of the dewatered cake of crushed stone powder decreases, and further, the solidified material is finely crushed while being mixed and stirred, and gradually granulated.
[0009]
This manufactured granulated product is a granular material with low viscosity, so it is easy to mix with earth and sand, etc. and is easy to handle, and has sufficient strength to withstand use as a roadbed material, etc. In addition, it has a property that does not become muddy with rainwater. In addition, since the magnitude | size and intensity | strength of this granulated material change with the mixing ratio of a crushed stone powder dehydrated cake, a crushed stone powder, and a solidification material, a mixing ratio is determined suitably according to a use use.
[0010]
In this way, both the dehydrated cake of industrial crushed stone and the crushed stone powder that has been used for the purpose are used effectively to make use of both, and a part of expensive solidified materials such as cement. Can be replaced with cheap crushed stone powder, and the cost can be reduced.
[0011]
Further, the produced granulated material is spread to an appropriate thickness and compacted by rolling, and allowed to stand for several days to be cured, and then crushed with a crusher, and the crushed material is sieved, Use granular materials as construction materials. This crushed material has a higher strength than the above-mentioned granulated material, and can be more suitably used as a construction material such as a roadbed material.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described in detail.
[0013]
An example of a mixer 1 suitable for carrying out the method of the present invention is shown in FIGS. The mixer 1 passes through two parallel mixing shafts 3, 3 ′ in a mixing tank 2 and is rotatably supported by a bearing 4 fixed to the mixing tank 2. A mixing motor 3 is driven by a drive motor 5. 3 'is rotated in the opposite direction indicated by the arrow in FIG. Arms 6 and 7 are arranged radially on the mixing shafts 3 and 3 ′, crushing blades 8 for crushing a lump at the tip of the arm 6, and a mixing tank at the tip of the arm 7. A scraping blade 9 is provided to take up the action of scraping the material adhering to 2.
[0014]
The crushing blade 8 has a shape in which a mass to be crushed is bitten into the gap with the inner wall 10 of the mixing tank 2 and pressed strongly against the inner wall 10. The scraping blade 9 is a crushing blade. 8 scrapes off the material that has been crushed by 8 and adheres to the inner wall 10 of the mixing tank 2, and the scraped material can be fed out in the axial direction of the mixing shafts 3, 3 ′. By repeating the crushing action and the scraping action on the lump supplied into the tank 2 many times, the lump is mixed with a solidifying material or the like while finely crushing, and can be granulated.
[0015]
Next, experimental data obtained by actually mixing the crushed stone powder dehydrated cake, the dried crushed stone powder, and the solidified material using the mixer 1 will be described.
[0016]
The dehydrated cake of crushed stone powder (water content 4%), dried crushed stone powder and solidified material are mixed and stirred at different mixing ratios and mixing times, and the properties of the granulated product obtained under each condition are granulated. Comparison was made by diameter, strength, and the like. As the solidifying material, various solidifying materials such as cement-based solidified material, quick lime, slaked lime, and gypsum can be used.However, in the experiment, the use is assumed to be roadbed material, and the granulated material has a large strength. Cement to be developed was used.
[0017]
Moreover, in measuring the particle size of the granulated product, the produced granulated product was passed through sieve meshes having different mesh sizes, and the weight of the granulated product passing through each mesh size sieve mesh was calculated as a passing weight percentage. In measuring the strength, the granulated material was subjected to a destructive test, and the compressive strength at that time was calculated.
[0018]
First, as shown in the graph of FIG. 3, with the addition amount of cement and the mixing time being constant, the weight mixing ratio of the crushed stone powder dehydrated cake only and the crushed stone powder dehydrated cake and the dried crushed stone powder Comparing the particle size of the granulated product produced when mixed as 7: 3 and 5: 5, the weight mixing ratio is 5: 5 compared to the granulated product having a weight mixing ratio of 7: 3. It can be seen that the particles have a finer particle size. In addition, the granulated material manufactured only with the crushed stone powder dehydrated cake was too coarse to be sieved. From the above, it can be seen that the higher the weight mixing ratio of the dried crushed stone powder to the crushed stone powder dehydrated cake, the finer the particle size of the granulated product produced.
[0019]
Moreover, the result of having measured the compressive strength of each said granulated material was shown in the graph of FIG. As can be seen from this graph, it can be seen that the higher the weight mixing ratio of the dried crushed stone powder to the crushed stone powder dehydrated cake, the higher the compressive strength of the granulated product produced.
[0020]
Next, as shown in the graph of FIG. 5, the weight mixing ratio of the crushed stone powder dehydrated cake and the dried crushed stone powder is 7: 3, the mixing time is constant, and the amount of cement to be added is the crushed stone powder dehydrated cake and The particle diameters of the granulated materials when compared with 5, 10 and 20% by weight with respect to the total weight of the dried crushed stone powder were compared. Then, when the cement amount is 5 and 10%, there is not much difference in the particle size of the granulated material, but when the cement amount is 20%, the particle size of the granulated material is larger than that of 5 and 10%. It can be seen that the particle size of the granulated product is fine only for the size of 1 to 10 mm.
[0021]
Next, as shown in the graph of FIG. 6, the weight mixing ratio of the crushed stone powder dehydrated cake and the dried crushed stone powder is 5: 5, the amount of cement added is constant, and the mixing and stirring time is 60 seconds. Although the case where it was set to 120 second was compared, there was almost no difference in the particle size of both granulated materials. From this, it can be seen that apart from the minimum time required for granulation, the length of the subsequent mixing time does not significantly affect the particle size of the granulated product.
[0022]
Moreover, the result of having measured the compressive strength of said 2 types of granulated material was shown in the graph of FIG. As can be seen from this graph, it can be seen that the longer the mixing time, the higher the compressive strength of the granulated product.
[0023]
Summarizing the above results, if it is desired to use a granulated product with a finer particle size, the mixing ratio of the dried crushed stone powder to the crushed stone powder dewatered cake is increased and the amount of solidified material such as cement mixed in is increased. It turns out that it is better to increase. In addition, if the strength of the granulated product is required, it goes without saying that the amount of solidified material should be increased, but from experimental data, the mixing ratio of dried crushed stone powder is increased and the mixing time is increased. You can see that
[0024]
Based on the above experimental data and properties such as the moisture content of the crushed stone powder dehydrated cake, the mixing ratio of the crushed stone powder dehydrated cake and the dried crushed stone powder, and the solidified material, and the mixing time should be determined appropriately. The most suitable properties can be freely granulated according to the use of the granulated product.
[0025]
The granulated material thus produced is a low-viscosity, easy-to-handle granular material, which is easy to mix with other earth and sand, etc., and stabilized with solidifying material, so mud from rainwater etc. also occurs In addition, depending on the mixing method, sufficient strength can be exhibited, and it can be suitably used as a construction material. In addition, since this granulated material itself is not mutually firmly couple | bonded, it is especially suitable for the roadbed material etc. of a road which may be dug up again.
[0026]
In this way, it is possible to recycle at a time by mixing the dewatered cake of crushed stone powder, which is industrial waste, and the crushed stone powder that was searching for applications, and the amount of expensive solidification material can be reduced. It is possible to provide effective materials at low cost, and the economic effect is great.
[0027]
Next, a method for increasing the strength of the granulated product produced by mixing and pulverizing the crushed stone powder dehydrated cake, the dried crushed stone powder, and the solidified material, and making it more suitable as a roadbed material will be described.
[0028]
First, the produced granulated material is spread in a mold with an appropriate thickness, and this is compacted by rolling with a rolling roller, and allowed to stand for several days to be cured. Next, this hardened material is roughly divided, and this is put into a crusher and crushed into a size suitable as a construction material such as a roadbed material. This crushed material is sieved, and one having a predetermined particle size is used as construction material. Since the crushed material is compacted, the strength is higher than that of the above-described granulated material, and the crushed material is more suitable as a roadbed material.
[0029]
In the present embodiment, the mixer as described above is described as an example of the mixer for the crushed stone powder dehydrated cake, the dried crushed stone powder, and the solidified material. However, the present invention is not limited to this. Of course, shaft continuous or batch stirrers and other suitable mixers can be used.
[0030]
【The invention's effect】
As described above, according to the method for treating a crushed stone powder dehydrated cake according to the present invention, the crushed stone powder dehydrated cake, the dried crushed stone powder, and the solidified material are supplied to a mixer, mixed and crushed and granulated. After that, this granulated material is spread to a predetermined thickness, compacted by rolling, allowed to stand for several days and cured, then crushed with a crusher, and the crushed material is sieved to construct a product with a predetermined particle size. Because it is used as a material, it is possible to effectively use both crushed stone powder dehydrated cake, which is an industrial waste that has been difficult to dispose of in the past, and crushed stone powder that has been sought for use at a low cost as a resource. The granulated product can be easily mixed with other earth and sand and is excellent in handling and can maintain sufficient strength, and its economic effect is great.
[Brief description of the drawings]
FIG. 1 is a front view showing a mixer used for carrying out a method for treating a crushed stone powder dehydrated cake according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is a graph showing the particle size of the granulated product produced by the method for treating a dewatered cake of crushed stone powder according to the present invention according to the mixing ratio of dried crushed stone powder.
FIG. 4 is a graph showing the compressive strength of the granulated product produced by the method for treating a dewatered cake of crushed stone powder according to the present invention according to the mixing ratio of the dried crushed stone powder.
FIG. 5 is a graph showing the particle size of the granulated product produced by the method for treating a crushed stone powder dehydrated cake according to the present invention according to the mixing ratio of cement.
FIG. 6 is a graph showing the particle size of the granulated product produced by the processing method of the crushed stone powder dehydrated cake according to the present invention according to mixing time.
FIG. 7 is a graph showing the compressive strength of the granulated product produced by the method for treating a crushed stone powder dehydrated cake according to the present invention by mixing time.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mixer 2 ... Mixing tank 3, 3 '... Mixing shaft 8 ... Crushing blade | wing 9 ... Scraping blade | wing

Claims (1)

After supplying crushed stone powder dehydrated cake, dried crushed stone powder, and solidifying material to the mixer, mixing and pulverizing and granulating , this granulated material is spread to a predetermined thickness and compacted by rolling, A method for treating a dewatered cake of crushed stone powder, characterized in that the crushed material is crushed by a crusher after being left to cure for several days, the crushed material is sieved, and a material having a predetermined particle size is used as a construction material .

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