How does tall aluminous brick shape

Tall aluminous brick is a kind of of fireproof material commonly used firebrick, of firebrick shape craft is having close connection with a lot of respects. What place should say today is about tall aluminous brick shape.

 

 

Soft qualitative clay has better plasticity, accordingly, make tall aluminous brick use soft qualitative clay to serve as bond normally. But, the free Al2O3 in the free SiO2 in clay and tall aluminous aluminous grog produces Molaishi 2 times to convert reaction below 1200 ℃ , produce larger put oneself in another's position to expand, the porosity of silicon increases, intensity is reduced. Accordingly, the affiliation of pink of the clay in burden is measured with exceeding 5% advisable.

In addition, can use small pink of tall aluminous alumina to make small pink of bond; or will tall aluminous alumina and argillaceous pink be made up by certain proportion, preparation synthesizes Molaishi to make bond. With these bond all can make the tall aluminous brick that must expand 2 times.

Pug of tall aluminous brick is used normally thick, medium, fine 3 class burden. Thick grain upper limit is 2~3m normally, join a quantity to be 40~50%(to different goods, thick grain upper limit can reduce the intermediate grain to 2~1mm)1~0.1mm to add a capacity with 10-20% advisable the fine pink of;<0.1mm joins a quantity to should be controlled in 40~50% .

Manufacturing practice makes clear, increase thick particle size and amount to be able to increase the accumulation density of pug appropriately, and shape easily. Firing when, 2 Molaishi all round stock convert reaction weaker, easily agglomeration. But, enlarge particle size also has certain limit. If magnify 4~5mm, easy generation is short of an edge to drop horny phenomenon, and organize even degree to be affected. So, large particle size with 3mm advisable.

Fine pink is joined to be helpful for base substrate burning the agglomeration, density that adds product in burden. What arise when agglomeration as a result of fine pink is firing and contractive OK and abate or the bulk that offsets Molaishi changes reaction place to arise 2 times expands, join fine pink terribly to want so. But, fine pink adds a capacity overmuch, it is difficult to shape not only, and easy generation crackle, firing and contractive bigger, percent defective increases. Flourish Cheng Naicai thinks, fine pink adds a capacity with 40~50% advisable.

Intermediate grain both neither has the framework effect of thick grain, also do not have the agglomeration effect of fine pink. Accordingly, the affiliation of intermediate grain is measured normally limitation is in small amount. But, cannot cancel intermediate grain entirely. If cancel, after goods is burned easy generation chap, exterior quality is bad, and to stock processing brings certain difficulty. Generally speaking, intermediate grain adds a capacity with 10% advisable.

Improve the quality of tall aluminous brick, rise shape pressure, reduce the porosity of tall aluminous brick, to reduce the porosity of tall aluminous brick, from raw material choose, burden, till shape,mix, firing each working procedure should take corresponding step.

The bibulous rate of grog of chosen alumina of one class tall aluminium in order to be less than 5% advisable, 2 course material is bibulous lead in order to be less than 7% advisable. Be less than water content the soft qualitative clay of 4% and tall aluminous aluminous grog mix fine grind. Mix fine crocus burden with this kind, can reduce base brick porosity.

The grain when burden upgrades, thick in fine than be 4:2: 2Advisable, big grain should not exceed 5mm. The order of feed in raw material when batch mixing is as follows: Join thick grain first, rejoin sulphurous acid mixes 3min beforehand after pulp waste liquid, rejoin fine pink undertakes mixture. Flourish Cheng Naicai is forbidden thick, fine grained is joined at the same time grind inside the unit operation of cargo handling that adds waste liquid of sulphurous acid pulp again.

To reduce porosity, should instead of will bosseyed pressurization is double-faced pressurization, blow number also should differ according to quantity of feed in raw material and different. If use blaze pit firing, should adjust the position of aperture suction internal heat, make mid close, brim is rare, and close wicket goes out to be added appropriately close, make difference in temperature of difference in temperature of kiln furnace fluctuation, inside and outside is not more than 20 ℃ .

To common for tall aluminous brick, shape pressure should achieve what 137MPa; high density spends tall aluminous brick to shape pressure should be inside 176~215MPa limits. That is to say, the friction that introduces 250t above only presses bricky machine to form, ability obtains such result. Porosity of tall aluminous adobe should achieve following requirements: 2 level of 21%; of ≤ of brick of one class tall aluminium are high 3 level of 23%; of aluminous brick ≤ are high aluminous brick ≤ 22% .

Before shaping, want to examine model dimension. Common model of tall aluminous brick puts feet rate: 3.0%; of face of press press of medium, bottom is not upside 1.5%; press press face 1.5%

The adobe moisture content after shaping all is in commonly 3.5% above, cannot enter pit instantly firing, need to pass dry in order to reduce moisture content.

Shape with handiwork, wind hammer pounds dozen of base substrate that shapes with vibration to should have nature first dry. Through natural and dry base substrate, accessibility desiccator undertakes dry. Desiccator sirocco inlet temperature is temperature of waste gas of 100~120 ℃ ; to be 60~80 ℃ .

Pass after dry the tall aluminous brick after can enter kiln of high temperature channel to undertake periodic agglomeration shapes directly.