Brick of Mo Laishi heat preservation is with Molaishi (the expensive aluminous simple fireproof stuff that 3Al2O3 · 2SiO2) gives priority to brilliant photograph. General alumina content is in 65% ～ 75% between. Mineral composition divides Molaishi outside, contain alumina among them inferior person still contain a few glass photographs and Fang Shiying; to contain alumina taller person still contain a few corundum. Brick of Mo Laishi heat preservation can be used at liner of furnace of high temperature kiln directly, use extensively already at the liner of shuttle type kiln, roller path kiln, glass and petro-chemical kiln furnace at present.
What does goods of Mo Laishi heat preservation have?
The different and main component of brick of Mo Laishi heat preservation according to density weighs qualitative Molaishi to be mixed gently character brick, according to using temperature different and main component is: 1350, 1450, 1550 Mo Laishi bricks.
Mo Laishi gets together brick of light heat preservation is with agglomeration clay of alumina of Mo Laishi grog, industry, union is mixed float bead make up pug, classics machine presses figuration. Mo Laishi gets together because brick of light heat preservation is had fireproof stability of degree of tall, thermal shock good, coefficient of thermal conductivity is low and characteristic, come with it directly at present build by laying bricks or stones builds the kiln furnace liner such as shuttle type kiln, use is more and more extensive.
Mo Laishi gets together light brick, also call Molaishi heat preservation brick, have effect of favorable heat preservation heat insolation, system is secret little weight is light also be one of its characteristic. Use extensively at structure of upside of vitreous frit kiln to expect at present brick, change board, treatment is structure of kiln furnace upside, firing device of kiln furnace, fusion kiln furnace, fine, heat the heat preservation thermal insulation of facilities of device, labor waiting for heat.
Because Molaishi gets together,brick of light heat preservation has taller porosity, big load cannot have borne when using brick of Mo Laishi heat preservation, avoid even metal, as slaggy as melt reach contact of dirt of high temperature furnace; When build by laying bricks or stones builds brick of Mo Laishi heat preservation, the brick is seamed and expand seam should decorate correctly, lest push put oneself in another's position of bad build by laying bricks or stones because of expanding. Brick of Mo Laishi heat preservation should not suffer sharp machine to shake, bump and chafe;
The function of brick of Mo Laishi heat preservation reachs his to apply: Fireproof degree taller, can amount to above of 1790 ℃ . Loading bate begins temperature ℃ of 1600 ～ 1700. Intensity of normal temperature compression 70 ～ 260 MPa. Heatproof shake sex is good. Have agglomeration Mo Laishi brick and electric frit Mo Laishi brick two kinds. Agglomeration not comes stone brick is main raw material with tall aluminous aluminous grog, join a few clay or unripe alumina to make bond, via shaping, firing and make.
Electric frit not comes stone brick is raw material with alumina of tall alumina, industry and fireproof clay, join charcoal or coke granule to make reducer, law of reductive report frit is used to make after shaping. The crystallization of electric frit Mo Laishi is bigger than agglomeration Mo Laishi, heatproof shake sex is better than agglomeration goods. Their high temperature capability basically depends on the uniformity that the content of alumina and glass of Mo Laishi get along with distributing. Basically use at lining of blind angle of system of splitting decomposition of kiln of agglomeration of regenerator of kiln of frit of shaft of hot-blast stove roof, blast furnace and hearth, glass, pottery and porcelain, oil to wait.
Mo Laishi pledges gently the manufacturing technology of heat preservation brick
Use at present production of brick of heat preservation of light qualitative Mo Laishi notes an oar commonly usedly to shape law, natural conserve comes after drawing of patterns, immigrant forced in desiccator dry, pass high temperature next firing, firing base substrate is finished product namely through mechanical burnish treatment.
Order of the feed in raw material in agitate process is:
Join fireproof raw material first, after mix is even, join sawdust white again mix is even, add water next. The affiliation of water measures ordinary control to be in 50% the left and right sides, make oar body maintains better liquidity, facilitate shape, in the meantime, unapt moisture is overmuch, affect conserve time. In agitate compound process, join the additive such as intensifier of the agent that decrease water, green compact to wait even. After waiting for pug to mix slop, join additive A, mix again even. The slop infuse that will made shapes in the model, quiet place conserve falls in room temperature, make slop medium redundant moisture disperses and evaporate, general left and right sides of quiet place 24h is OK drawing of patterns, right now the moisture of slimy base is in 35% the left and right sides. Fall when moisture to 25%~30% when, dry car enters desiccator to undertake enforcing on base substrate dry, dry temperature Gao Ke in order to achieve 110 ℃ ; after dry 24~48h, divide when base substrate water under 2% when, go up kiln is firing. Firing undertake in the kiln of type of shuttle burning gas of 20m3, firing temperature 1
300 ℃ , heat preservation 4h, cease-fire hind drops in temperature to give pit below to 200 ℃ , firing the semifinished product after passes mechanical burnish precision work, finished product is namely after certificate of proof. Product exterior is white, air hole is the small air hole that 1mm controls more. Compare with the product exterior photograph that is the agent that make hole with EPS grain ball, air hole is smaller evener, quality of a material is more exquisite.
Alone use sawdust serves as the agent that make hole, use note an oar to shape law, add the additive of certain amount, can produce the Molaishi with a good performance brick of light qualitative heat preservation. This craft is simple, suit batch production, and do not use EPS raw material, already managing cost environmental protection. The pure sawdust Mo Laishi that production gives pledges density of heat preservation brick is controlled for 0.57g · Cm-3 gently, coefficient of thermal conductivity is 400 ℃ 0.16W · (M · K)-1, excel of index of product coefficient of thermal conductivity is general product, energy-saving effect rises apparently, have very good economic benefits and social beneficial result.
In the choice Molaishi pledges gently heat preservation brick when same need considers agglomeration Mo Laishi brick and electric frit Mo Laishi the sexual price of these two kinds of Mo Laishi bricks compares the brick, use brick of Mo Laishi heat preservation according to particular kiln furnace case.
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