Of firebrick of heavy qualitative Mo Laishi advocate brilliant photograph is Molaishi, fireproof degree be in 1850 the left and right sides, loading bate temperature is high, rate of high temperature creep is low, heatproof shake sex is good, acid-proof sex is slaggy erode. Brick of heat preservation of light qualitative Mo Laishi calls Molaishi adiabatic firebrick, basically be the fireproof material that gives priority to mine photograph character with siliceous aluminium, have good heat preservation heat proof quality.
Performance of qualitative heat preservation of light qualitative Mo Laishi is good, it is high grade fireproof insulation material, press the proportion that the product asks to need, add organic and compound filler, pass vacuum extrusion, the product of light qualitative Mo Laishi that below high temperature agglomeration makes, flourish Cheng Naicai produces light qualitative Molaishi by different specifications, its content is 50%-80% .
The manufacturing technology of brick of heat preservation of light qualitative Mo Laishi uses brick of existing heat preservation of light qualitative Mo Laishi to produce the commonly used law that note an oar, come via natural conserve after drawing of patterns, immigrant forced in desiccator dry, classics high temperature is firing base substrate, become finished product namely via mechanical burnish. The stock when mixing joins order to be as follows: Join fireproof material above all, after mix is even, join sawdust white, mix is even, add clear water next. Add water to measure ordinary control to be in 50% the left and right sides, make oar body maintains better liquidity, facilitate shape, in the meantime, because water is divided,won't pass much and influence conserve time. In addition, still can add the additive such as intensifier of the agent that decrease water, green compact in agitate process. After waiting for mud and mud to mix, join additive A, mix again divide evenly. Shape the serous infuse moulding that has made, quiet place conserve falls in room temperature, make the redundant moisture in size evaporates dispersedly, general 24h is controlled can drawing of patterns, right now the water content of slimy base is about 35% . Drop to fall to the circumstance of 25%~30% in water content, the dry car on base substrate enters desiccator to undertake enforcing dry, dry temperature can amount to 110 ℃ , dry 24~48h, be in when base substrate moisture content 2% the following when undertake going up kiln. In the fire in kiln of type of 20m3 gas shuttle, firing 1300 ℃ , heat preservation 4h, the refrigeration after cease-fire gives pit below to 200 ℃ , via examining the fine of burnish of machinery of semifinished product classics after, finished product is namely after certificate of proof. White of this product exterior, air hole is the small air hole that 1mm controls more. Make the product of the agent that make hole at EPS grain ball relatively, stomatic and lesser, even, grain is exquisite. Sheet makes the lotion that make hole with wood chip, shape with the law that note an oar, add the additive of certain amount, the Molaishi that can make performance is superior pledges gently heat preservation brick. This law operation is simple, apply to mass production, need not EPS raw material, save cost, environmental protection. Produces pure sawdust Mo Laishi pledges density of heat preservation brick is 0.57g · Cm-3 to control gently, coefficient of thermal conductivity is 400 ℃ 0.16W · (M · K)-1, excel of index of product coefficient of thermal conductivity is common product, energy-saving effect is apparent, have very good economic benefits.
Firebrick of high quality Mo Laishi produces a technology to be similar to the method of tall aluminous qualitative firebrick. Expect in order to synthesize Mo Laishi grog for bead, fine pink is grog of synthetic Mo Laishi, or make up what comprise into equivalent and Molaishi to mix fine powder with pink of white corundum quartz, pure clay. Have groovy product by item characteristics. Low creep tastes the frit that reach report Mo Laishi brick. Mo Laishi firebrick is by bead makings and fine pink mix to mix and be become in proportion, deserving commonly usedly to compare is: Bead makings 45%~55% , fine pink (<0.088mm)55%~45% . Mix is even, high pressure shapes. ℃ of combustion temperature 1550~1600. When with synthesis of electric frit law Mo Laishi grog is a makings, its are firing temperature should be more than 1700 ℃ . Use andalusite to make low creep Molaishi brick, it is pink of stone of line of pink of stone of line of aggregate, silicon, silicon with andalusite. Industrial oxidation aluminium powder. Mix abrade pink earth to be able to make agglomeration Mo Laishi brick. Burden scale is: Collect makings: In grain: Granule =50:12:38. Add compound bond, with 260t attrition presses a brick to shape. Be less than body drying to incomplete water rate 1% , install at pouring the fire inside blaze kiln. Fire temperature 1490 ℃ , heat preservation 19h, the porosity of the product is 17.15% , bulk density 2.53g/cm3, compression intensity 136.5MPa, loading 1627 ℃ . Below 50 ℃ , creep rate can be achieved when 50 ℃ 0.87% . Be like fire temperature 1450 ℃ , lengthen heat preservation time to be able to realize agglomeration to 26h. But index of its physics function relatively the product of 1490 ℃ fire wants a few lower. Be like 1450 ℃ , the creep rate of 50h is 0.98% .
Mo Laishi brick basically uses low creep at sirocco roof. Blast furnace body and hearth. Regenerator of vitreous frit kiln. Kiln of agglomeration of pottery and porcelain. Lining of system of oil splitting decomposition. This report frit Molaishi the brick is with tall aluminium alumina is raw material, make up Molaishi with different alumina (3Al2O3 · 2SiO2, quality comparing is Al2O372%.SiO228%) . Fused temperature makes an appointment with 2300 ℃ , below 1850 ℃ pouring sand mold, undertake anneal next, eliminate stress. Crystal photograph is given priority to with Molaishi, corundum, with vitreous photograph fill. It compares agglomeration model it is better to fight vitreous fluid corrode, but not as fireproof as other report frit material. Add a few (2 zirconia of 7%~8.5%) , can make not come decrescent of stone brilliant photograph, bricky organization is compact, the quantity increases Mo Laishi to 60%~70% , vitreous appearance content drops relatively, and crackle is reduced. The brick heats up electric frit Molaishi coefficient of expansion is small, heatproof shake performance is good, fight vitreous fluid aggressivity strong. Frit of the report that make Molaishi when the brick, in cooling process first brilliant of separate out corundum, next crystal of separate out Mo Laishi. The others a few SiO2.Al2O3.Fe2O3.CaO.MgO.Na2O became vitreous appearance later. In brick, the proportion of vitreous photograph is achieved 25% . Because contain material of many low melting point, its fight corrode sex relatively brick of other report frit is poor. Existence bleb and reductive content are returned in vitreous photograph, because this is using liquid of glass of pollution of the meeting in the process.
The recipe can determine Al2O3 content according to use condition, at present more commonly used burden method is: ① synthesizes Molaishi (of agglomeration or of electric frit) the makings that it is collect + synthesize Mo Laishi pink; ② synthesizes Molaishi (agglomeration or electric frit) the makings that it is collect + synthesize Mo Laishi pink + Al2O3 fine pink + high pure argillaceous pink; ③ synthesizes Molaishi (agglomeration or electric frit) with electric frit Bai Gangyu is aggregate + synthesize Mo Laishi pink + Al2O3 fine pink + high pure argillaceous pink. Should according to " both sides is big, among small " burden principle, deserve to compare. Sulfite waste liquid or get together chloric aluminium or much pvc colophony are bond, via mixing adequately, high pressure shapes, within high temperature kiln firing, firing temperature basis of content of the Al2O3 in firebrick different, it is commonly between 1600~1700 ℃ . Mo Laishi firebrick contains the foreign matter oxide such as TiO2.Fe2O3.CaO.MgO.K2O and Na2O normally, by the Molaishi that natural raw material makes, its matter content wants prep above to synthesize material artificially. Oxide of this kind of impurity is having flux effect of Molaishi, the formation that reduced frit fluid temperature and viscosity, increased fluid photograph to make an amount; Increase fluid to be opposite the deliquescent rate in solid photograph and deliquescent quantity, but the action intensity of each impurity oxide has difference, in the meantime, the impact that K2O and Na2O form temperature to fluid photograph is very big, k2O and Na2O make its are not had respectively change dot temperature drops 513~724 ℃ , also can decompose Molaishi at the same time. Among them, tiO2 is very small to the influence of foreign matter oxide, have 101~107 ℃ only without change dot temperature drops.
When TiO2 content is inferior, fashion finite solid solution in Molaishi except partial solid dissolve, of stimulative Molaishi generate and crystallization development grows, the part below high temperature enters fluid photograph to form vitreous body. Taller Fe2O3 has certain solid dissolve to spend in Molaishi and corundum, fashion finite solid solution. Its solid dissolve is spent in comparing corundum taller, this is the formation as a result of its solid solution, make Molaishi and corundum crystal lattice grown. The scale of the initiative melting point that to A12O3 one SiO_2 is material and A12O3 content or A12O3/SiO2 concerns Fe2O3, the circumstance of 2.55 is less than to fall in A12O3/SiO2 content, initiative melting point is 1380 ℃ , be more than when A12O3/SiO__2 2.55 when, initiative melting point is elevatory to 1460 ℃ , as the addition of A12O3 content, content lifts gradually. Next Fe2O3 reductive arrive for Tuo Rong in vitreous photograph, make initiative temperature of the system is reduced thereby 1240 ℃ and 1380 ℃ . The result makes clear, as the addition of A12O3 content, the high temperature capability of Mo Laishi brick gets ameliorative, frit dosage increases, high temperature capability drops. Accordingly, control content of foreign matter oxide strictly, especially K2O.Na2O and content, it is the important step that produces firebrick of high-powered Mo Laishi. The Bu of slaggy or gaseous annulus of alkaline to containing composition, have to Mo Laishi brick erode action badly.
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