In big country of our country and even current very much industry, in a lot of production industries such as building materials, metallurgy, chemical industry, environmental protection, use rotary kiln to undertake manufacturing operation widely. Rotary kiln is to point to rotate to calcine kiln (common weighs kiln coming back) , belong to building materials equipment kind. Rotary kiln differs by processing stock can divide for kiln of cement kiln, metallurgy chemical industry and limekiln.
Fireproof material is the important material that makes sure rotary kiln moves normally, the yield of the locomotive rate of its function and service life to kiln and grog quality has very big effect.
Choose fireproof material to need to wait a few conditions a moment to decide according to the temperature of to calcine stock, chemistry, have the to calcine of need superhigh temperature of some of material, choose fireproof material to cannot be used common fireproof; Those who have stock of some of corporeal to calcine is caustic stronger, need fireproof material to have very strong anticorrosion performance.
Following the sort that is the commonly used fireproof material in rotary kiln of current our country.
1. Phosphate combines brick of tall aluminous qualitative line
Phosphate combines brick of tall aluminous qualitative line to include two kinds of products, one kind is qualitative brick of phosphatic union tall aluminium (abbreviation phosphate brick) , another kind is brick of qualitative wear-resisting of tall aluminium of phosphoric acid union (abbreviation wear-resisting brick) .
2. Magnesia brick
The magnesian content of magnesia brick not less than 91% , oxidation calcic content is more than 3% , with Fang Mei stone is main and mineral alkalescent and refractory products.
3. Brick of magnalium pointed spar
Brick of magnalium pointed spar is to improve the thermal shock stability of magnesia brick, alumina is joined in burden and produce with magnalium needle spar is main and mineral magnesium qualitative brick.
4. Combine magnesian chromic brick directly
Inside large kiln, kiln is lukewarm in 1700 ℃ above, common magnesium chromic brick is competent hard already, chromic brick of direct union magnesium is produced to get used to cement namely large change and development rises, high quality magnesian chromium is qualitative fireproof material.
5. Common magnesium chromic brick
Magnesian chromic brick contains MgO55%-80% , cr2O3 ≥ 8% , main and mineral for pointed spar of square magnesian Shi Hege, silicate photograph is magnesian olivine and calcic magnesian olivine.
6. Get together phosphoric acid natrium combines magnesia brick
This brick is magnesia brick of a kind of chemical union, its are comprised is with tall calcic synthesis magnesia makes aggregate, get together phosphoric acid natrium makes bond, pulp waste liquid makes to hydrate depressor.
7. Alkali resistance brick
It is the brick of alkali resistance clay of Al2O3 content 25-28% , those who make kiln gas medium is alkaline produce chemical reaction quickly after the agglutinate on bricky face with bricky face, form the glair facing of a tall viscosity, closed alkaline a narrow passage providing the only means of access to a certain place that continues to erode to bricky system interior, prevented thereby " alkaline crack " .
8. Heat-insulating material
Heat-insulating material is the adiabatic product that becomes with pledging fireproof stock is made gently. Its breed has brick of light qualitative to calcine, fireproof adiabatic concrete, thermal insulation board and pottery and porcelain fireproof fiber.
9. High-powered fireproof and pouring makings
Because cement raw material is medium harmful impurity the action of circular rich market of alkaline, chloric, sulfur, make the place such as next the cone of intake air heater, ascendant flue, makings brae easy produce chemical reaction with raw material, generation writtens guarantee the skin jams, make stock moves suffocate suffocate, in these place cleared knot skin jams very difficult, affect normal production. Be aimed at this one circumstance, domestic development goes those who apply to kiln mouth and place of gush coal canal is high-powered fireproof and pouring makings, and kiln end fights knot skin and high temperature alkali resistance character with SiC pouring makings.
10. Tall aluminous qualitative brick
Tall aluminous qualitative brick is in for alumina content the siliceous aluminous refractory products of 48% above. Mineral composition is corundum, Molaishi and vitreous photograph.
It is important that rotary kiln comparatives in the action of industrial domain, the needle is fireproof to rotary kiln when we are building rotary kiln the choice of material also needs science comprehensive. Such ability assure the use result of rotary kiln quite, also can lengthen kiln furnace service life, avoid resource loss waste.
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