Tall aluminium gets together brick of light heat preservation belongs to fireproof material, also belong to insulation material, have good high temperature capability, heat preservation heat proof quality is good, manufacturing technology introduces below, interested friend can understand together below.
Light qualitative tall aluminous brick is the important heat-insulating material of furnace of hot project kiln, alumina content is more than 48% , the light qualitative fireproof material that basically constitutes by Molaishi and glass or corundum. Cubage density is 0.4~1.359/cm3. Interstitial rate is 66%~73% , compressive strength is 1~8MPa. Heat-resisting shake sex is better; Logical choice and make light qualitative tall aluminous brick, to reasonable use the sources of energy, carry out policy of national energy resources correctly to have important sense. In brick of of all kinds light qualitative heat insolation, light qualitative tall aluminous brick is fireproof the gender is good, unit weight is little, raw material is rich, firebrick price is low, it is better heat-insulating material. Differ according to manufacturing technology, can use bubble method or add character legal system to make light qualitative tall aluminous brick. Tall aluminium gets together although brick of light heat preservation uses temperature taller, but the contradiction as a result of intensity, unit weight and heat proof quality, restricted its application in area of a few high temperature, cannot use as directly accordingly structural insulation material. As a result of the reason in preparation process, created a problem that at present tall aluminous heat-insulating material exists generally: Unit weight small intensity is poorer, and high capacity heat proof quality is poorer. How to find small opening of excel in of tall aluminium of a kind of preparation so the beautiful method of heat-insulating material, make one of main way that fireproof material studies.
The preparation technology that passes to a few kinds light qualitative data undertakes comparative, discover foaming can preparation gives the tall aluminous qualitative small opening that has rate of tall closed pore and alveolus diameter regulation heat-insulating material, and the heat-insulating material appearance of foaming preparation is diversiform, preparation craft is simple.
It is burden mixes. The inhomogenous mixture meeting of stock and foaming agent solution affects the uniformity that the stoma in stock distributings, affect the epispastic rate of stock even. When farinaceous raw material and foaming agent solution mix directly, foaming agent churns in impeller the bubble with next meeting many generation, the local meeting that the water in foaming agent solution churns in impeller forms bubble, cannot mix adequately with all and farinaceous raw material, successive water film cannot be formed in makings oar, generation slop slants analyse. Because makings oar is medium existence water film is discontinuous phenomenon, the air in making agitate enters makings oar cannot be lapped and diffuse outwards, make the aeriform bulk that leaves in makings is reduced eventually, lowered the epispastic rate of foaming agent.
Mix to make raw material and vesicant sufficient even, reach the great value of epispastic rate, foaming preparation the mixture craft cent of light qualitative insulation material is 3 measure. Should make sure powdery makings mixes first even and even. The concrete step of this experiment is: Mix all powdery makings together, for many times sift out, reoccupy ball mill undertakes the ball of 0.5h is ground, mix in order to ensure pink expects even. 2 it is to should make sure the mixture of powdery makings and water is even. Put powdery stuff into beater first, add water agitate 1~2min, mix raw material and water equably into mud. Gather to prevent powdery body to be in those who expect the oar is medium, OK and proper affiliation divides powder. With water too much, not only can reduce base substrate intensity, still can cause bubble to be not stabilized, should add the right amount agent that decrease water so, in order to reduce its dosage. 3 it is to should make sure oar makings and foamy mix even. Add the foaming agent solution that already had matched in size, come with fixed speed mix bubbly, ceaseless agitate makes size and bubble mix even, make bubble size shape.
2 it is to shape. To assure the epispastic rate of the light qualitative insulation material that foaming produces, the water content in slop is higher. Shape differently through a few kinds the method compares discovery, undertake to the material with slop high moisture content the oar shapes noting only, and cannot give the base substrate with larger volume with figuration of the law that note an oar; The law that note an oar can make sure the stoma inside base substrate distributings already even, can make make a technology again simple, decide to use the law that note an oar to shape eventually.
3, dry with fire because moisture content of the base substrate after figuration is higher, it is very important that because this is dry,craft makes sure to preventing base substrate to be out of shape craze is mixed base substrate interior is stomatic and whole. The big question that epispastic legal system has in pledging heat-insulating material is produced gently, exist is dry process trival, cycle is long, dry when base substrate opens fission body easily. To simplify foaming preparation pledges gently the dry technology of heat-insulating material, make its are operated easily in actual production, this experiment chooses common sweatbox dry, classics is pouring the room temperature after the oar expects is dry and constant after time, with last film is sealed, put into microtherm sweatbox, shape till base substrate solidify, eliminate lasts film, drawing of patterns, in putting sweatbox again slow heat, divide complete eduction till water.
With test block of muffle furnace agglomeration. Normally, the agglomeration process of fireproof material is solid photograph agglomeration, the change immigrate of the interface between the bead of migratory He Jing that basically relies on energy of stock chart face is finished. Of material firing the sort of temperature and raw material, granuality about. Same raw material, grain jumps over fine easier agglomeration, firing temperature is lower. With α - Al2O3 is raw material, use the data of a variety of different bead diameter, joined have high temperature to aid the MgO that burns action, make its firing temperature achieves 1500 ℃ .
Combustible accretion determines this method still can add combustible in mud, make bulk density be the light firebrick of 0.8. Be used combustible add character to have sawdust, rice husk, coke pink, anthracitic etc. Easy burn oneself out of combustible accretion requirement, ash content content is low, and harmful matter content is low in ash content. Normally multi-purpose sawdust, rice husk, dosage is in commonly 30~40% . Sawdust should pass screening, rice husk can be ground together with tall aluminous alumina make. Mud and flammable accretion is in wet 4~5min mixes in the machine that press mud, or through helix extruder extruding becomes mud. The water content of clay is 40~50% . After pug mixes practice, can shape in wooden model. Mu Moxian uses water to soak, brush with sawdust, reload mud, the drawing of patterns after strickle. After semifinished product classics is dry, fire has below formulary temperature.
Tall aluminium gets together when fire of brick of light heat preservation, often contain foreign matter oxide, be like RO, RO, fe2O3. They fall to make fluid appearance with Al2O3 and SiO2 reaction in high temperature. When using Al2O3-SiO2-R2O system, what fluid photograph measures the growth rate below high temperature to follow temperature is elevatory and accelerate. Accordingly, as a result of firing of temperature elevatory, fluid photograph quantity increases substantially, fluid photograph viscosity drops, meet those who cause a brick to be out of shape, reduce bricky high temperature capability. Accordingly, with the agglomeration craft that fluid photograph agglomeration gives priority to, appropriate is used inferior firing temperature, extend heat preservation time. Actual application makes clear, tall aluminous brick all can use one class, 2 level identical firing temperature. Use blaze kiln fire, general 1430 ℃ , heat preservation 40 hours; The ℃ of 1390~1420 of temperature of tall aluminous qualitative brick such as Ill. Issue combustion of use channel kiln with 1450 Celsius in 1550 Celsius respectively. Tall aluminous brick uses fire of weak oxidation atmosphere commonly.
In the light of different grade the quality of tall aluminous brick asks, choose the aluminous raw material of different grade, be helpful for reasonable use, product essence matchs, do not use as far as possible mix the raw material with serious step. The quality of clinker depends on calcination temperature, to ensure clinker is sufficient agglomeration is mixed as far as possible high bulk density, should be achieved normally or the calcination temperature of alumina of summary prep above, make in calcination process Molaishi is changed 2 times with agglomeration contractive action is finished.
Fireproof material occurrence craze, fall off, easy how to wear away to do? Want to solve a problem thoroughly, need to be dug from germ, the analysis gives real reason, flourish Cheng Naicai is engaged in be able to bear or endure service of timber production, research and development is old, can solve all sorts of difficulty problems of liner of furnace of high temperature kiln, welcome broad new old friend to seek advice reach technical communication.
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