CN103539468B - High-alumina high-temperature refractory castable for power station boiler - Google Patents
High-alumina high-temperature refractory castable for power station boiler Download PDFInfo
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Abstract
The invention discloses a high-alumina high-temperature refractory castable for a power station boiler, which is prepared from the following components in parts by weight: 60-80 parts of high-alumina aggregate, 5-12 parts of special-grade kaolin, 5-12 parts of binder, 2-8 parts of silicon micro-powder, 2-10 parts of alumina micro-powder and 1-5 parts of water, wherein in the 60-80 parts of high-aluminum aggregate, coarse aggregate accounts for 30-40%, medium aggregate accounts for 35-45%, and fine aggregate accounts for 20-30%; the binder is prepared from the following components in parts by weight: 20-40 parts of magnesium silicate and 80-60 parts of phosphate. The high-alumina high-temperature refractory castable disclosed by the invention has the beneficial effects that the boiler box temperature can be increased by 60-250 DEG C, the thermal efficiency can be improved to 8%, and the service life of the boiler body is prolonged.
Description
Technical field
The invention belongs to technical field of refractory materials, particularly relate to a kind of High-alumina high-temperature refractory castable for power station boiler.
Background technology
Compared with qualitative refractory product, with refractory castable be that the unshape refractory of representative has that technical process is short, production energy consumption and cost is low, easy to use, applied widely, globality and the advantage such as result of use is good, thus worldwide obtain and develop rapidly, its proportion shared in whole refractory materials is more and more higher.In the country of some refractory technologies advanced person, the output of unshape refractory is close to the output even having exceeded setting goods.Such as, the ratio that current Japanese unshape refractory output accounts for whole refractory materials reaches about 60%; The U.S. be about 50%; English, moral, Fa Deng state are 40% ~ 50%.Nowadays, refractory castable has been widely used in the high temperature service of the industrial circles such as metallurgy, building materials, electric power, chemical industry, such as, in quality coal in cement kiln systems, has now widely applied the refractory castable of various material.
Unshape refractory by the granular of rational gradation composition and powder-material and bonding agent jointly form without being shaped and burn till direct for refractory materials.The essentially consist of unshape refractory is granular and refractory material that is powdery, according to its service requirements, can being made up of various material, in order to make these refractory materials be combined into entirety, generally all adding the bonding agent of suitable kind and quantity.The kind of unshape refractory is a lot, can classify according to the material of refractory material used, as siliceous, clayey, High-Alumina, magnesia, rhombspar matter, chromium matter, containing zirconium matter etc.General unshape refractory has the features such as preparation process is easy, yield rate is high, heat energy consumption is lower.Meanwhile, there is conformability strong during use, can be made into firm Integral construction thing.
But its aluminium sesquioxide content of existing High-Alumina unshape refractory is general all below 60%, it is high temperature resistant, wear-resisting, resistance to antihunt action is slightly inadequate, in its batching, composition is more single simultaneously, the composite performance of multiple resistance to material can not be provided, the structure density of product and erosion resistance poor, and sclerosis condensation slower.Now, all kinds of with coal, electricity, oil, gas is in the energy, the high-temperature zone of high temperature kiln or the inboard wall of burner hearth (refractory wall and metallic surface) of combustion chamber all need to carry out integrated poured with unshape refractory, thicken, Bonded Repair, the particularly cast of the steel rolling furnace wall of metallurgy industry, repair, the transformation of boiler roof sealing and Thermal Power Generation Industry water-tube boiler burner hearth wall with refractory lining, refracto, the abrasionproof of abrasionproof and walling of flue around nozzles, boiler roof sealings etc. utilize common single High-Alumina unshape refractory to be difficult to reach wear-resisting, high temperature resistant, antidetonation, energy-saving and cost-reducing effect.
Summary of the invention
In view of this, for the deficiency that the above prior art exists, there is provided that to have aluminium sesquioxide content high, can on kiln inwall the overall a kind of High-alumina high-temperature refractory castable for power station boiler forming the refractory masses that density is high, wear-resisting, high temperature resistant, erosion resistance, shock resistance are good.
A kind of High-alumina high-temperature refractory castable for power station boiler, makes by comprising following parts by weight component: bauxites aggregate 60 ~ 80, superfine kaolin 5 ~ 12, binding agent 5 ~ 12, silicon powder 2 ~ 8, alumina powder 2 ~ 10, water 1 ~ 5.Wherein, in the number of bauxites aggregate 60 ~ 80, coarse aggregate accounts for 30% ~ 40%, and middle aggregate accounts for 35% ~ 45%, and fine aggregate accounts for 20% ~ 30%.Binding agent comprises following parts by weight component and makes: Magnesium Silicate q-agent 20 ~ 40, phosphoric acid salt 80 ~ 60.
The invention has the beneficial effects as follows: 1, owing to being integrated poured, strengthen heat-insulating property, fire box temperature 60 ~ 250 DEG C can be improved and reach 8% with raising thermo-efficiency, and burner hearth is less, cast area larger, improve furnace temperature and thermal effect benefit higher, apparatus of thermo-electric power boiler completely can de-oiling burn; 2, because aluminium sesquioxide content improves, and add silicon powder and alumina powder, the anticorrosion antiwear performance of pouring layer is improved, protection body of heater, extend body of heater and reach 6 times work-ing life.
Embodiment
The technical solution adopted in the present invention is that after a certain proportion of bauxites aggregate, superfine kaolin, binding agent, silicon powder, alumina powder, water being mixed, namely ageing mixture makes High-alumina high-temperature refractory castable for power station boiler.Concretely:
A kind of High-alumina high-temperature refractory castable for power station boiler, makes by comprising following parts by weight component: bauxites aggregate 60 ~ 80, superfine kaolin 5 ~ 12, binding agent 5 ~ 12, silicon powder 2 ~ 8, alumina powder 2 ~ 10, water 1 ~ 5.Wherein, in the number of bauxites aggregate 60 ~ 80, coarse aggregate accounts for 30% ~ 40%, and middle aggregate accounts for 35% ~ 45%, and fine aggregate accounts for 20% ~ 30%.Binding agent comprises following parts by weight component and makes: Magnesium Silicate q-agent 20 ~ 40, phosphoric acid salt 80 ~ 60.Wherein, bauxites aggregate, superfine kaolin, silicon powder have effect that is high temperature resistant, wear-resisting, erosion resistance, and superfine kaolin, binding agent have the effect being beneficial to construction, bonding and strengthening sticking power, can improve density and the anti-seismic performance of pouring layer entirety.
Further say: bauxites aggregate is superfine, one-level aluminium vanadine, and described superfine high-aluminium vanadine is the high-aluminium vanadine of aluminium sesquioxide content more than 85%, and one-level high-aluminium vanadine is the high-aluminium vanadine of aluminium sesquioxide content between 80% ~ 85%; Bauxites aggregate through crusher in crushing, be screened into required carse, medium and small aggregate, coarse aggregate size scope is 4.0 ~ 2.0mm, and middle aggregate size is 1.5 ~ 1.0mm, and fine aggregate particle diameter is 0.5 ~ 0.064mm; Alumina powder is the mixing of Reactive alumina, calcining aluminium micro mist arbitrary proportion; Phosphoric acid salt can be aluminum phosphate.
Below illustrate above-mentioned High-alumina high-temperature refractory castable for power station boiler:
Embodiment 1
(1) parts by weight for the preparation of High-alumina high-temperature refractory castable for power station boiler raw material are: bauxites aggregate 60 parts, superfine kaolin 10 parts, binding agent 10 parts, silicon powder 8 parts, alumina powder 10 parts, 2 parts, water.Wherein, account for 30% at the coarse aggregate of bauxites aggregate, middle aggregate accounts for 45%, and fine aggregate accounts for 25%; 20 parts, binding agent mesosilicic acid magnesium, phosphoric acid salt 80 parts, coarse aggregate size scope is 4.0 ~ 3.0mm, and middle aggregate size is 1.2 ~ 1.0mm, and fine aggregate particle diameter is 0.3 ~ 0.064mm.
(2) bauxites aggregate, superfine kaolin, silicon powder carry out premix, binding agent, alumina powder continuation batch mixing is added to full and uniform evenly, be dry mixed 2 minutes, then add clean water mix 5 ~ 6 minutes after ageing mixture both High-alumina high-temperature refractory castable for power station boiler.
Its physical performance index is: after 110 DEG C × 24h dries, folding strength is 8 ~ 9MPa, and compressive strength is 80 ~ 90MPa; After 1100 DEG C × 3h high temperature reheating, the folding strength of sample is 25 ~ 35MPa, and compressive strength is 95 ~ 120MPa, and volume density is 2.00 ~ 6.12g/cm
3, Linear change rate is 0.1 ~ 0.6%.
Embodiment 2
(1) parts by weight for the preparation of High-alumina high-temperature refractory castable for power station boiler raw material are: bauxites aggregate 70 parts, superfine kaolin 5 parts, binding agent 8 parts, silicon powder 12 parts, alumina powder 2 parts, 3 parts, water.Wherein, account for 25% at the coarse aggregate of bauxites aggregate, middle aggregate accounts for 45%, and fine aggregate accounts for 30%; 25 parts, binding agent mesosilicic acid magnesium, phosphoric acid salt 75 parts, coarse aggregate size scope is 4.0 ~ 3.0mm, and middle aggregate size is 1.1 ~ 1.0mm, and fine aggregate particle diameter is 0.1 ~ 0.064mm.
(2) bauxites aggregate, superfine kaolin, silicon powder carry out premix, binding agent, alumina powder continuation batch mixing is added to full and uniform evenly, be dry mixed 5 minutes, then add clean water mix 8 ~ 9 minutes after ageing mixture both High-alumina high-temperature refractory castable for power station boiler.
Its physical performance index is: after 110 DEG C × 24h dries, folding strength is 10 ~ 11MPa, and compressive strength is 90 ~ 100MPa; After 1100 DEG C × 3h high temperature reheating, the folding strength of sample is 40 ~ 55MPa, and compressive strength is 100 ~ 130MPa, and volume density is 6.00 ~ 8.12g/cm
3, Linear change rate is 0.3 ~ 0.6%.
As described above, be only preferred embodiment of the present invention, when not limiting scope of the invention process with this, the simple equivalence namely generally done according to the present patent application the scope of the claims and invention description content changes and modifies, and all still remains within the scope of the patent.
Claims (4)
1. a High-alumina high-temperature refractory castable for power station boiler, it is characterized in that: this High-alumina high-temperature refractory castable for power station boiler is made by comprising following parts by weight component: bauxites aggregate 60 ~ 80, superfine kaolin 5 ~ 12, binding agent 5 ~ 12, silicon powder 2 ~ 8, alumina powder 2 ~ 10, water 1 ~ 5; Wherein, in the number of bauxites aggregate 60 ~ 80, coarse aggregate accounts for 30% ~ 40%, and middle aggregate accounts for 35% ~ 45%, and fine aggregate accounts for 20% ~ 30%; Binding agent comprises following parts by weight component and makes: Magnesium Silicate q-agent 20 ~ 40, phosphoric acid salt 80 ~ 60.
2. High-alumina high-temperature refractory castable for power station boiler according to claim 1, is characterized in that: phosphoric acid salt is aluminum phosphate.
3. High-alumina high-temperature refractory castable for power station boiler according to claim 1, is characterized in that: coarse aggregate size scope is 4.0 ~ 2.0mm, and middle aggregate size is 1.5 ~ 1.0mm, and fine aggregate particle diameter is 0.5 ~ 0.064mm.
4. High-alumina high-temperature refractory castable for power station boiler according to claim 1, is characterized in that: alumina powder is the mixing of Reactive alumina, calcining aluminium micro mist arbitrary proportion.
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| CN101444840A (en) * | 2007-11-27 | 2009-06-03 | 大连核心铸造技术工程研究所 | Casting powder for casting magnesium aluminum alloy |
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