260 results about "Sillimanite" patented technology

A dry refractory composition having superior insulating value. The dry refractory composition also may have excellent resistance to molten metals and slags. The composition includes filler lightweight material, which may be selected from perlite, vermiculite, expanded shale, expanded fireclay, expanded alumina silica hollow spheres, bubble alumina, sintered porous alumina, alumina spinel insulating aggregate, calcium alumina insulating aggregate, expanded mulllite, cordierite, and anorthite, and matrix material, which may be selected from calcined alumina, fused alumina, sintered magnesia, fused magnesia, silica fume, fused silica, silicon carbide, boron carbide, titanium diboride, zirconium boride, boron nitride, aluminum nitride, silicon nitride, Sialon, titanium oxide, barium sulfate, zircon, a sillimanite group mineral, pyrophyllite, fireclay, carbon, and calcium fluoride. The composition also may include dense refractory aggregate, which may be selected from calcined fireclay, calcined Chamotte, a sillimanite group mineral, calcined bauxite, pyrophyllite, silica, zircon, baddeleyite, cordierite, silicon carbide, sintered alumina, fused alumina, fused silica, sintered mullite, fused mullite, fused zirconia, sintered zirconia mullite, fused zirconia mullite, sintered magnesia, fused magnesia, sintered spinel, and fused spinel refractory grog, a heat activated bonding agent, and a dust suppressant.

The invention relates to sagger with coatings capable of resisting high-temperature lithium battery corrosion and a method for preparing the sagger, and belongs to the field of refractory materials. Thesagger with the coatings capable of resisting high-temperature lithium battery corrosion comprises a sagger blank, and is characterized in that a layer of glaze with the coatings capable of resisting high-temperature lithium battery corrosion is impregnated on the surface of the sagger blank, and then the sagger blank is baked in a high-temperature furnace to obtain the sagger; the glaze with the coatings capable of resisting high-temperature lithium battery corrosion comprises dry materials and solvents which are mixed with one another, and the solid content of the glaze is 30-40vol%; the dry materials comprise, by weight, 20-50% of Al2O3, 20-50% of SiO2, 15-35% of ZrO2, 10-25% of MgO and 5-16% of Li2O. Micro-powder is further added into the sagger blank, and the weight percentage of the micro-powder is 2-10%; the micro-powder comprises one of andalusite, kyanite and sillimanite or mixture of more than two of the andalusite, the kyanite and the sillimanite. The sagger has the advantage that erosion of the sagger due to lithium ion solution can be effectively prevented.

The invention discloses a sillimanite brick used in the large blast furnace stove and a production method thereof. The raw material of the sillimanite brick contains 30 to 60 percent of mullite, 30 to 60 percent of sillimanite or / and andalusite and 10 to 40 percent of common milling powder, and additionally, a binder, whose weight accounts for 2 to 5 percent of the total weight of the above raw materials, is added into the above raw materials. The production method of the brick comprises mulling, aging, molding, drying and firing processes; and green bricks are heat preserved for 8 to 12 hours under 1480 to 1520 DEG C to be fired, and are taken out of the kiln after being cooled naturally. The creep rate of the sillimanite brick is only 0.179 percent in the conditions of 1450 DEG C and 50 hours, the compressive strength reaches 76.2 Mpa, and the service life of the product is long. Thus, the product can completely meet the performance requirements of the sillimanite brick used in the blast furnace stove, and the product surpasses the performances of the same kind products at home and abroad and ends the history that the product has been imported from foreign countries all the time.

The invention discloses a fireproof material. The fireproof material is prepared from the following raw materials in parts by weight: 35 to 70 parts of black mud powder or 10 to 45 parts of furnace slag or mixture of the black mud powder and the furnace slag, 10 to 50 parts of red silica powder or quartzitic sandstone power, 5 to 15 parts of kyanite powder or andalusite powder or sillimanite powder, 1 to 4 parts of zirconium silicate powder or yttrium-stabilized zirconia powder, 5 to 15 parts of cement, 3 to 5 parts of sodium hexametaphosphate, 3 to 5 parts of fibers, 0.5 to 1 part of aluminum sol or yttrium sol, and the balance being water and animal composite foaming agent. The invention also provides a preparation method for the fireproof material, and a fireproof door made from the fireproof material. The fireproof material is high in refractory temperature, low in manufacturing cost and simple in preparation method. The fireproof door is simple in structure, easy to produce, longin refractory time, high in refractory temperature, low in production cost and stable in quality.

The invention discloses a zirconium oxide sandwich composite calcining-endure plate. The zirconium oxide sandwich composite calcining-endure plate comprises a matrix mullite calcining-endure plate and zirconium oxide paint. The matrix mullite calcining-endure plate comprises the following raw materials in percentage by mass: 20 to 25 percent of andalusite with thickness degree between 1 and 1.5 mm, 5 to 10 percent of andalusite with thickness degree between 0.5 and 1 mm, 5 to 8 percent of andalusite with thickness degree less than 0.5 mm, 10 to 15 percent of plate-shaped corundum with thickness degree between 0.5 and 1 mm, 5 to 10 percent of plate-shaped corundum with thickness degree less than 0.5 mm, 5 to 10 percent of electrical melting mullite with thickness degree between 0.5 and 1 mm, 8 to 12 percent of sillimanite powder, 15 to 20 percent of alpha-aluminium oxide (Al2O3) powder, 2 to 3 percent of silica micropowder, 3 to 4 percent of clay and 3 to 4 percent of binding agent. The zirconium oxide paint comprises the following raw materials in percentage by mass: 75 to 80 percent of zirconium oxide with granularity less than or equal to 600 meshes and 20 to 25 percent of silicasol. In addition, the invention also provides a process for preparing the zirconium oxide sandwich composite calcining-endure plate. The zirconium oxide sandwich composite calcining-endure plate has the advantages of high-temperature resistance, high mechanical strength, stable chemical properties, high stability of thermal shock resistance, long service life and high anti-stripping property.

The invention discloses a mullite setter plate with high thermal shock resistance and a preparation method thereof. The preparation method comprises the following steps: mixing sillimanite, alpha-Al2O3 powder, micro-silicon powder, clay and aluminum fluoride in a ball mill according to mass percentages; then evenly mixing andalusite particles, sheet-like corundum particles and mullite particles in a mixer based on mass percentages, adding a binding agent yellow dextrin solution for stirring, and then adding powder evenly mixed in the ball mill for even stirring, sealing material package, and shock shaping by double-surface pressurization on a shock press, and obtaining the mullite setter plate by high-temperature burning. The setter plate prepared in the high-temperature mullitization process by adopting andalusite aggregate and the sillimanite has the advantages of good stability and high strength of thermal shock resistance, good temperature resistance, long service life, simple preparation process and low cost, and is suitable for mass production; and when high-grade electronic components are calcined by the setter plate, the setter plate has stable performance, the sintered electronic components have higher yields and better electrical property.

The invention discloses a corundum-mullite zircon fire-proofing material. The corundum-mullite zircon fire-proofing material comprises the following materials according to certain weight percentage, the particle size and the purity: plate-shaped corundum, white corundum, brown corundum, mullite, sillimanite, zirconite, alpha-Al2O3, silicon powder and Guangxi clay, and is formed by adding a binding agent. The invention also discloses a preparation method of the fire-proofing material. The fire-proofing material prepared by the invention is widely used in a high-blast-temperature internal combustion stove ceramic burner and has the advantages of high refractoriness under load, good anti-seismic performance under the high temperature, high compression strength, good creep resistance and the like.

Spherical and rod-shaped proppants and anti-flowback agents made from sillimanite minerals possess high strength and high conductivity. The sillimanite minerals may be selected from the group consisting of kyanite, sillimanite, and andalusite and may be used alone or in combination with other materials, such as bauxite, kaolin, meta-kaolin, pure or technical grade alumina (about 98%-99.9% alumina by weight), alumina-containing slag, zirconia, silica, iron, alkali elements (such as calcium, magnesium, and sodium), and virtually any other mineral containing alumina. The starting material may optionally be milled to achieve better compacity and crush resistance in the final proppant or anti-flowback agent. A fracturing fluid may comprise the rods or spheres alone, or in combination with each other or other proppants or anti-flowback agents of different shapes.

The invention discloses a high-refractoriness under load thermal shock-resistant refractory brick, which is prepared from the raw materials of high alumina bauxite, electrically-fused corundum, synthetic mullite, sillimanite, bonding agent, additive and water according to the following mixture ratio by weight portion: 10 to 15 percent of high alumina bauxite granule, 10 to 15 percent of electrically-fused corundum granule, 35 to 45 percent of synthetic mullite granule, 10 to 15 percent of sillimanite powder, 5 to 10 percent of bonding agent, 6 to 10 percent of additive and a proper amount of water; and the brick is prepared by the method comprising the following steps: placing the weighed high alumina bauxite, electrically-fused corundum, synthetic mullite granule into a mixing mill for mixing; after the mixture is mixed uniformly, adding the sillimanite powder, the bonding agent, the additive and the proper amount of water into the mixing mill for mixing for 8 to 12 minutes and obtaining pug of which water content is controlled to be 3 percent; pressing the well mixed pug into green bricks on a brick molding press and placing molded green bodies of which the density is controlled to be 2.808kg / cm<3> into a tunnel kiln for drying; firing the green bricks at 1,460 to 1,480 DEG C and keeping the temperature for 8 to 10 hours; and obtaining finished bricks. The brick has a long service life and can prolong the service life of the kiln.

The invention relates to a honeycomb heat accumulator made of silicon carbide-corundum composite materials, which comprises the following main raw materials: 20-30wt% of silicon carbide powder, 4-8wt% of zirconia corundum powder, 20-30wt% of corundum powder, 15-20wt% of porzite powder, 15-30wt% of composition of kyanite, andalusite and sillimanite, 4-8wt% of kaolin and 2-5wt% of cellulose powder. The preparation method of the honeycomb heat accumulator comprises the following steps: adding the main raw materials into a ball mill for ball milling; adding stearic acid of which the weight is not greater than 1% of the total weight of the main raw materials for ball milling, and then, sieving to obtain a mixture; respectively adding tung oil of which the weight is not greater than 1% of the weight of the mixture and glycerol of which the weight is not greater than 1% of the weight of the mixture for mixing, aging and vacuum pugmill to form pug segments; carrying out extrusion forming in a mold, and drying; and insulating at the temperature of 1400-1450 DEG C for 4-8 hours, and then, calcining. The honeycomb heat accumulator of the invention has the characteristics of high fire resistance, good thermal shock resistance, strong corrosion resistance, large heat exchange area, small gas flow resistance, high heat accumulating efficiency, small floor space and long service life which can be more than two years, and is widely used for heat accumulating type heating furnaces of black and non-ferrous smelting, thermal power generation, petrochemical industry, ceramics, glass, machining, civil cookers and the like.

The invention relates to the technical field of 3D printing sand mold casting and in particular to a water based flow coating for a 3D printing sand mold and a preparation method of the water based flow coating. The water based flow coating is prepared from zircon powder, white corundum, high-aluminum fine powder, ferrochrome mineral powder, pyrophyllite powder, sillimanite powder, cyanite powder, andalusite powder, spodumene powder, sodium bentonite, sea-foam stone powder, polyvinyl alcohol, polyvinyl acetate emulsion, phosphate, silica sol, sulfonated dioctyl succinate sodium salt, preservative, a defoaming agent, fluorite, iron oxide red and water. The water based flow coating for the 3D printing sand mold has the advantages of excellent mobility, appropriate permeability, good leveling property, high-efficiency suspension stability, appropriate coating thickness, super strong anti-burn-on property, environment protection, no pollution and high efficiency.

The invention provides a manufacturing method of a seal cover for an operation observation aperture on a carbon calciner fire wall. Raw materials consist of three parts of aggregate, matrix and additive. The aggregate comprises three or more components selected from: granular mullite, high aluminium corundum, bauxite chamotte, flint clay and andalusite; the matrix comprises fine-powdered mullite,bauxite chamotte, andalusite or kyanite or sillimanite, alumina, high-alumina cement, silicon micro powder and high temperature heat resistant steel fiber; the additive is a mixture comprising two ormore components selected from sodium tripolyphosphate, sodium hexametaphosphate, CMC, FDN and sodium lignosulfonate. The manufacturing method includes steps of: proportioning raw materials; mixing bya mixer; adding water with stirring; putting into a die; partitioning into blocks and moulding; carrying out natural maintenance; and drying at 110 DEG C-300 DEG C for 24-48h. The invention has beneficial effect that the seal cover produced by the method has excellent physical and chemical performance indexes, such as high high-temperature flexural strength, good thermal shock stability and refractoiness under load.

The invention discloses raw materials for preparing an anti-corrosion mullite brick, comprising calcium hexaluminate, andalusite, sillimanite, alumina, cordierite, pyrophyllite, kaolin, refractory oxide, foaming agent and binding agent. The preparation method includes the following steps: the sillimanite, alumina, cordierite, pyrophyllite, kaolin, refractory oxide and binding agent are added into a grinding machine to be ground after material preparation, so as to obtain base material; the calcium hexaluminate and andalusite are added into a kollermill to be mixed and milled for 5-10 minutes, water is added until the surface is wetted, so as to obtain particle aggregate, and the base material is added into the kollermill to be mixed, milled and stirred with the particle aggregate, so as to obtain mixture; and water is injected into the mixture and stirring is carried out to form muddy mixture and green brick is obtained, and the green brick is placed into a kiln to be sintered into the anti-corrosion mullite brick finished product. The mullite brick prepared by the raw materials and preparation method has the advantages of low thermal conductivity, good thermal insulation property and strong corrosion resistance.

The heat insulating corundum-mullite brick has the material composition comprising fused white corundum powder finer than 325 mesh 30-40 wt%, alpha-alumina powder finer than 325 mesh 20-30 wt%, gamma-alumina powder finer than 10 microns 20-30 wt%, sillimanite powder finer than 120 mesh 10-20 wt%, No. 1 Suzhou clay powder finer than 280 mesh 8-15 wt% and water 25-30 wt%, as well as foamed polystyrene balls of 0.5-2 mm size and saw dust in 0-0.5 mm size in certain amount. The heat insulating corundum-mullite brick has long service life, capacity of resisting high temperature up to 1700 deg.c, high resistance to various kinds one atmosphere, low heat conductivity, low heat capacity and excellent heat shock stability.

A heat shock resistant refractory brick with long service life is prepared from high-Al powder, mullite, sillimanite, cordierite, andalusite, argil and mud as adhesive through grinding, shaping and sintering.

The invention relates to a high-strength high thermal-shock-resistance low-aluminium mullite brick, which comprises the following components in percentage by weight: 15-50% of raw material sintered mullite, 5-15% of electric melted mullite, 10-40% of superfine flint clay, 10-30% of sillimanite, 10-30% of andalusite, 2-10% of activated alumina, 2-15% of zirconite, 2-12% of silica and 3-10% of bond clay. The high-strength high thermal-shock-resistance low-aluminium mullite brick provided by the invention made from the above raw material components has the advantages of high refractoriness under load (larger than or equal to 1500 DEG C) and heated volume stability, high thermal-shock resistance (larger than or equal to 50 times under water cooling at 1100 DEG C), low creep rate (smaller than or equal to 0.15 in 20-50 hours), good compressive strength (larger than or equal to 70Mpa), good volume stability and low impurity content at high temperature and the like; and at the same time, the CO corrosion resistance of the product provided by the invention is unaffected, so that the product provided by the invention can meet the use requirements of the medium and large blast furnace hot blast stove and other high-temperature kilns.

The invention provides a bauxite-based low-creep mullite product, which belongs to the field of fire-resistant materials. The bauxite-based low-creep mullite product is prepared by the following steps of: adding quartz sand, a sillimanite mineral, corundum, industrial aluminum oxide, kaolin and the like into high-alumina bauxite serving as a base material; proportioning, homogenizing, mixing, shaping and drying the mixture; and sintering the mixture at the temperature of 1,650 DEG C under the normal pressure to obtain the low-cost and high-grade bauxite-based low-creep mullite fire-resistant product. In the preparation, a composite technology route is adopted, the mineral composition is optimized and the mullitization during the production and use is effectively controlled, so the high-grade fire-resistant material product can be obtained, the superior high temperature performance of the mullite is brought into full play and the creep is small and the expansion is slight in the use of the product; and the preparation of the product can fully utilize the available resources of China, improve the comprehensive utilization value of the resources and optimize the product structure. The product can be widely applied to the parts, such as heat storage chambers, small furnaces, feeding ports, material passage systems and the like, of glass melting furnaces and other high temperature industrial furnaces.

The invention discloses an artificial quartz stone sheet and a preparation method thereof. The artificial quartz stone sheet comprises the following components in parts by weight: 30-90 parts of 6-80mesh calcined quartz sand, 30-70 parts of 325mesh quartz powder, 5-15 parts of broken glass, 3-10 parts of 30-50mesh tourmaline, 3-12 parts of 50-100mesh sillimanite powder, 3-12 parts of 100-200mesh zirconium silicate powder, 5-10 parts of unsaturated resin, 0.3-2 parts of a silane coupling agent, 0.3-2 parts of a curing agent and 0.1-1 part of a pigment. By the calcined quartz sand, the hardness of the artificial quartz stone sheet is increased so that the artificial quartz stone sheet resists wear and is difficult to be scratched; tourmaline is added so as to increase the antimicrobial property of the artificial quartz stone sheet and meanwhile, sillimanite powder and zirconium silicate powder are added to improve the fireproof performance of the artificial quartz stone sheet.

The invention discloses a multi-layer composite runner brick and a production method thereof. The multi-layer composite runner brick comprises a brick base body, wherein the brick base body is provided with a steel liquid flow passage; a combining layer and a working layer are sequentially compounded onto the surface of the steel liquid flow passage; the brick base body is prepared from main materials including flint clay, pyrophyllite, third-level alumina clinker and clay, and a small amount of added sillimanite, andalusite and potassium feldspar; the working layer is prepared from main materials including corundum, mullite and alpha-Al2O3 micropowder, and a small amount of added sillimanite, silicon micropowder, clay and andalusite; the raw materials of the working layer are compounded into slurry, the slurry is sprayed onto the surface of the steel liquid flow passage and is fired, and the working layer reacts with a base body layer to form a mullite-based combining layer, thereby forming a whole; in a steel casting process, the working layer, the combining layer and the base body layer are closely combined together, so as to avoid the separation of the working layer. The multi-layer composite runner brick has the advantages that the cost is low, the high-temperature property is good, the anti-scouring erosion capability is strong, the market competition advantage is obvious, the thickness of the working layer can be adjusted through design, and the multi-layer composite runner brick is suitable for smelting different types of special steel.

The invention discloses a special type composite low alumina mullite brick which is prepared by raw materials by weight percent: 10-30% of mullite with granularity of 3-1mm, 20-40% of flint clay with granularity of 3-1mm, 10-20% of flint clay with granularity of 1-0mm, 5-15% of flint clay with granularity of -200 meshes, 10-30% of sillimanite or andalusite, and 15-25% of additive. The materials weighed according to the mixture ratio are mixed and ground, processed by ageing, extruded to be molded, dried and finally sintered, so that the special type composite low alumina mullite brick can be obtained. The special type composite low alumina mullite brick has the advantages of low apparent porosity and impurity, high strength and refractoriness under load, micro-expanded product, high mullite phase and the like, and has the function of one brick for multiple purposes. The application of the special type composite low alumina mullite brick can save a great deal of maintenance costs and energy conservation cost for steel users, thus having remarkable social and economic benefits.

The invention discloses a stone needle ceramic tile and a preparation method thereof. The stone needle ceramic tile is prepared from the following raw materials in parts by weight: 35-45 parts of a silica micropowder, 25-35 parts of obsidian, 20-30 parts of sillimanite, 15-25 parts of sea sand, 18-26 parts of flint clay, 12-24 parts of magnesia, 6-14 parts of a bamboo charcoal powder, 10-15 parts of a stone needle powder, 5-10 parts of a magnetic powder, 22-34 parts of modified clay, 4-8 parts of red mud, 3-6 parts of phosphorus ore slag, and 5-10 parts of volcano ash. The stone needle powder, the bamboo charcoal powder and the magnetic powder are added into the ceramic tile, so that the ceramic tile has higher health care value, can produce far infrared rays, ultrasonic pulses, magnetic fields and negative ions, not only can promote blood micro-circulation, regulates metabolism, improves human body immunity, also can adsorb and decompose various free harmful substances, kills bacteria, purifies air, and improves a living environment; and the prepared ceramic tile has the characteristics of high strength, low water absorption rate, good abrasion resistance, good weather resistance and the like, and is durable in use.

The invention discloses a mullite-based castable used for a tundish cover and a production method thereof. The mullite-based castable used for a tundish cover is prepared from main materials and additives, wherein the main materials include the following components in weight percentage: 40-60% of mullite particles, 10-30% of corundum particles, 5-20% of corundum fine powder, 2-10% of alpha-AI203 micropowder, 1-5% of SiO2 micropowder, 5-10% of raw material (kyanite, sillimanite and andalusite), and 3-10% of cement. The additives include the following components in weight percentage: 1-3% of No.446 steel fiber, 0.5-2.0% of a water reducing agent, 0.02-0.5% of aluminium powder, 0.05-0.5% of organic anti-explosion fiber, and 5.5-6.5% of water. A tundish cover produced by using the castable ishigh in normal and high temperature strength, good in thermal shock stability, remarkable in the effect of prolonging the service life of the tundish cover, and obvious in economic benefit.

A long afterglow ceramic with non-cracking glazed surface and preparation process are disclosed, the long afterglow ceramic with non-cracking glazed surface comprises a ceramic body and glaze materials, wherein the glaze materials include following raw materials: low temperature glaze water, long afterglow aluminate material, wherein low temperature glaze water includes the following raw materials: Australian spodumene, talc, limestone, borax, boric acid, Dehua quartz, sillimanite, kaolin, zinc oxide, wherein the Australian spodumene and sillimanite that constitute the raw materials of the lowtemperature glaze water have a very small thermal expansion coefficient, and the thermal expansion coefficient of the glaze materials can be reduced by the combination of the Australian spodumene andsillimanite, so that the thermal expansion coefficient is smaller than the thermal expansion coefficient of the ceramic body. During preparation process, firstly use the low temperature glaze water together with the long afterglow aluminate material, and frits formed by calcination can effectively reduce the firing temperature of the glaze to ensure the sintering temperature of the glaze is between 790 and 810 DEG C and to ensure the long afterglow effect of the luminous material in the glaze.

The invention relates to an ultrahigh strength thermal shock resistance corundum / mullite product and a manufacture method thereof. The manufacture method comprises steps of stirring 8-mesh white corundum, 80-mesh white corundum, 320-mesh tabular corundum, 24-mesh capacitance synthetic mullite, 36-mesh capacitance synthetic mullite, 280-mesh andalusite, 180-mesh sillimanite, 800-mesh aluminum oxide powder, 200-mesh kaolin and yellow dextrin for 1-3 hours, then adding 8% water so as to wring, stacking and ageing for 10 days, stirring for 15 minutes again, then molding through jolt-squeeze, naturally drying in shade, then firing for 6-8 hours at 1600 DEG C-1620 DEG C so as to obtain the ultrahigh strength thermal shock resistance corundum / mullite product. According to the manufacture method, the raw material chemical components and granularity ratio are optimized, the product is sintered fully, and the prepared corundum / mullite product has low porosity, large volume density, good strength, good thermal shock resistance, good integrated quality, and long service life up to 4-6 months.

The invention discloses an artificial quartzite plate and a manufacturing method thereof. The artificial quartzite plate is composed of the following components in parts by weight: 30-90 parts of 3-80-mesh quartzite, 30-70 parts of 325-mesh quartz powder, 5-15 parts of cullet, 3-10 parts of 30-50-mesh tourmaline, 3-12 parts of 50-100-mesh sillimanite powder, 3-12 parts of 100-200-mesh zirconium silicate powder, 0.1-2 parts of antioxidant, 5-10 parts of unsaturated resin, 0.3-2 parts of silane coupling agent, 0.3-2 parts of curing agent and 0.1-1 part of pigment. The antioxidant is added to the raw materials, thereby enhancing the oxidation resistance and ultraviolet resistance of the artificial quartzite plate. The tourmaline is added to the raw materials to effectively enhance the antibacterial property of the artificial quartzite plate, and thus, the artificial quartzite plate has long antimicrobial effect. The sillimanite powder and zirconium silicate powder, which are favorable refractory materials with very high melting point and hardness, can enhance the refractory temperature of the artificial quartzite plate, prolong the refractory time and increase the compression strength.

The invention discloses a special casting material for a 12000D / T kilneye, belonging to the field of refractory materials. The special casting material contains the following components in percentage by weight: 15-25% of mullite, 10-20% of sillimanite, 25-30% of tabular corundum, 5-10% of strontium titanate powder, 5-8% of zirconium oxide powder, 1-3% of gahnite powder, 3-5% of boron nitride, 5-10% of aumina micro-powder, 4-6% of calcium aluminate cement, 0.2% of polylactic acid fiber and sodium hexametaphosphate serving as an additive, wherein the addition amount of sodium hexametaphosphate accounts for 0.1% of the total weight of other components. The special casting material has high strength and the thermal shock resistance, high temperature resistance, volume stability and wear resistance of the material are improved; by use of the casting material, such defects of the kilneye as poor wear resistance and poor thermal shock resistance are overcome so that the service life of the kilneye of a cement kiln is prolonged from about 10 months at present to two years and longer.

The invention discloses a manufacturing process of iron oxide red transmutation glazed porcelain. The iron oxide red transmutation glazed porcelain comprises a green body and an iron oxide red glaze,wherein the green body is prepared from the following raw materials: Dehua feldspar, Dehua quartz, Dehua kaolin, sillimanite, szaibelyite, boehmite, sphalerite, zinc oxide and zirconium oxide. By limiting the composition of the green body and improving the basic formula of the glaze, a plurality of orange plaques with the sizes of broad beans and peas are distributed on the glaze surface of the fired iron oxide red transmutation glazed porcelain.

The invention provides a dry-quenched mullite brick and a preparation method thereof. The dry-quenched mullite brick comprises the following components in percentage by weight: 5wt%-10wt% of special grade high aluminum, 45wt%-55wt% of sintered mullite, 5wt%-15wt% of andalusite, 5wt%-10wt% of white flint clay, 12wt%-18wt% of sillimanite, 2wt%-6wt% of alumina and 2wt%-8wt% of clay. According to the preparation method, special grade high aluminum, sintered mullite, white flint clay and andalusite are taken as aggregates, and microcracks in an organization structure of the dry-quenched mullite brick are toughened, so that the thermal shock stability is improved; furthermore, by virtue of primary mullitization and secondary mullitization of andalusite and sillimanite at different temperatures, the high-temperature volume stability and high-temperature performance of the dry-quenched mullite brick are improved. According to the dry-quenched mullite brick, the apparent porosity is lower than 16%, the compression strength is higher than 90MPa, the wear resistance is smaller than 4cm<3>, and the thermal shock property is higher than 40 times.

The invention relates to a large blast furnace main iron runner castable, and belongs to the field of refractory castables. The large blast furnace main iron runner castable is prepared from, by weight, 5-8 parts of 8-5 mm chromium nitride, 15-20 parts of 5-3 mm chromium nitride, 10-15 parts of 3-1 mm sillimanite, 8-15 parts of 1-0 mm calcium chromate, 2-5 parts of partial clay powder, 3-7 parts of cobaltous oxide aluminum powder, 5-10 parts of cutting powder, 3-8 parts of amorphous graphite powder, 1-2 parts of composite charcoal powder, 0-3 parts of molybdenum trioxide powder, 3-5 parts of alumina micro powder, 1-5 parts of magnesium oxide iron powder, 1-3 parts of rho-aluminum oxide, 0-5 parts of electric smelting pure calcium aluminate cement and an addition agent, wherein the addition agent is prepared from, by weight, 0.1-0.2 part of calcium lignosulphonate, 0.01-0.05 part of nanometer potato powder, 0.01 part of malic acid and 0.1 part of C12H14N4O5S2. A blast furnace iron runner made of the castable has the advantages of being good in thermal shock resistance, high in corrosion resistance, large in iron exchanging amount and long in life.