Brick of Mo Laishi heat preservation gives priority to the light simple fireproof stuff of brilliant photograph with Molaishi. 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; Contain alumina taller person still contain a few corundum.
Light qualitative Molaishi effect of bricky quality light heat preservation is good, press product demand proportion, join organic and compound filler, high temperature burns the product of light qualitative Mo Laishi that combines, not come gently character Shi Zhuangen occupies different specifications, aluminous content is different.
1, rate of low heat conduction, have effect of very good adiabatic heat preservation;
2, lead as a result of low heat conduction, mo Laishi series pledges gently the heat energy with adiabatic brick very few save up, energy-saving in intermittent operation effect is apparent;
3, matter content is low have the oxide content such as low-down iron and alkali metal, accordingly, fireproof degree tall; The higher volume that contain aluminium makes its still maintain good performance below reducing atmosphere;
4, intensity of hot condition compression is high;
5, exterior dimension essence is accurate, accelerate build by laying bricks or stones to build career, reduce fireproof mud to use an amount, assured the intensity of body of build by laying bricks or stones and stability, prolong the life of liner thereby;
6, can process special form. Seam in order to reduce number of brick of build by laying bricks or stones and build by laying bricks or stones.
The classification of brick of Mo Laishi heat preservation: Weigh qualitative Molaishi to be mixed gently character according to the different and main component of density brick, according to using temperature different and main component is: Bricks of bricks of 1350 Mo Laishi heat preservation, 1450 Mo Laishi heat preservation, 1550 Mo Laishi bricks.
Characteristic of brick of Mo Laishi heat preservation: Fireproof degree taller, can amount to 1790 ℃ above. Loading bate begins temperature 1700 ℃ of 1600 ～ . Intensity of normal temperature compression 70 ～ 260MPa. 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.
The heat preservation performance that how improves brick of Mo Laishi heat preservation the progress as content of the Al2O3 in Mo Laishi brick, function of its high temperature progresses, and frit dosage grow in quantity, high temperature function is reduced. Accordingly, control content of foreign matter oxide strictly, especially the content of K2O, Na2O and Fe2O3, it is to obtain tall function the important step of Mo Laishi brick. In contain alkaline of kind of composition slaggy or gas atmosphere is medium use, to not coming the brick all has stone to corrode action austerely.
The Fe2O3 below high temperature has fixed firm dissolve to spend in Molaishi and corundum, fashion finite solid solution. Its solid dissolve in corundum is spent ratio those who be in Molaishi is tall, because of the formation of solid solution, make Molaishi and the crystal lattice of corundum grown. Fe2O3 to Al2O3 one SiO2 is material only then content of the Al2O3 in the influence of frit temperature and system perhaps says with Al2O3 ／ SiO2 ratio is concerned, when Al2O3 ／ SiO2, only then frit temperature is 1380 ℃ , when Al2O3 ／ SiO2>2. 55 when, only then frit temperature progresses 1460 ℃ , therewith A12O3 content progresses and progress gradually. Below reducing atmosphere, fe2O3 by reductive into FeO Tuo Rong enters vitreous phase, make of the system only then frit temperature drops, drop to be mixed to 1240 ℃ respectively 1380 ℃ .
Mo Laishi contains the foreign matter oxide such as TiO2, Fe2O3, CaO, MgO, K2O and Na2O normally in heat preservation brick, the matter content in the Molaishi that natural raw material produces should compare artificial synthesis raw material is tall. These foreign matter oxide have flux effect in Molaishi, the formation that reduces frit fluid temperature and viscosity, increase the inherent amount of fluid photograph, ascensive frit fluid is mixed to the deliquescent speed of solid photograph deliquescent amount, but the effect that each impurity oxide has loses by force level is different, form temperature to fluid photograph with K2O and Na2O among them the impact is big, k2O and Na2O make its nod temperature to reduce 513 ～ without variable respectively 724 ℃ , return an intention that discloses Molaishi at the same time. In these foreign matter oxide, the impact of TiO2 is little, make nod temperature to reduce 101 ～ without variable only 107 ℃ . When TiO2 when content is less, besides the branch solid dissolve fashions finite solid solution in Molaishi, stimulative Molaishi is brought up inherently with crystal development outside, still the branch enters fluid photograph to form vitreous body below high temperature.
The note has taller porosity as a result of brick of Mo Laishi heat preservation, 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
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