In firebrick, aluminous content is more than of 48 it is tall aluminous brick with respect to what say, 55 tall aluminous bricks attribute bid of look forward to brick of 3 class tall aluminium, also be 55 clay brick for what the client says, code name N1, specific gravity 2.2, single block weighs 3.7 kilograms, a ton 270 or so.
Tall aluminous alumina makes the main raw material of tall aluminous brick, its technological process basically the method of brick of clay of continue to use. Firing the physics of the process one chemical reaction, basically be aluminous stone of kaolinite, water decompose and not come 2 times petrifaction process.
In agglomeration process, 2 times Molaishi converts reaction is raw material to calcine and the crucial segment that make tall aluminous brick. The spare part SiO2 that kaolinite and pyrophyllite generate Molaishi and corundum react the Molaishi that form calls Molaishi 2 times each other, 2 times Molaishi changes the volume that has 10 ％ about to expand. 2 times Molaishi changes reaction to begin at 1200 ～ 1300 ℃ , react terminative temperature depends on the condition that resultant achieves a balance. If kaolinite (pyrophyllite) stone can smash adequately and can distributing equably with water aluminium, criterion in 1400 ～ 1500 ℃ can tend finish; Conversely, with former a to calcine, both distributing not divide evenly, cannot establish sufficient reaction condition, it is not easy that 2 times Molaishi changes a course be over, the Yi Da in making brick and use long-term hot history even is less than reaction to balance. For example, contain ％ the tall aluminous brick of 75 ％ of 70 ～ , answer by content of theoretical calculation corundum very little, but real product middling contains 20 ％ ～ 30 ％ corundum, this that is to say, 2 times Molaishi changes reaction unfinished complete.
Grade of tall aluminous brick differentiates: Ⅰ : Al2O3 content: 75-80% ; Ⅱ : Al2O3 content 60%~75% ; Ⅲ : Al2O3 content 48%~60% ;
Of tall aluminous firebrick and argillaceous brick shape production methods is basic and identical, it is some craft parameter only somewhat difference. Also have smash - mix refine - shape - dry - firing - examine - pack wait for process. It is better that its press stress to bear below microtherm but when high temperature somewhat the bring down piles up in kiln so under 1 meter. Tall aluminous firebrick and the manufacturing technology of many clinker clay brick are similar and different lie to be able to be as high as 90% ～ higher at scale of the grog in burden 99% grog are in broken before need to classification choose and screening are divided iron is firing temperature is like Ⅰ , Ⅱ higher to wait tall.
Tall aluminous brick basically is used at build by laying bricks or stones to build liner of roof of blast furnace, hot-blast stove, electric stove, blast furnace, reverberator, rotary kiln. In addition, tall aluminous firebrick still uses brick of mouth of the head of a place of strategic importance that becomes checker brick of type of open-hearth furnace accumulation of heat, gating system to use, water to wait widely.
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