95results about How to "Good volume stability at high temperature" patented technology

The invention discloses an andalusite self-flow castable, comprising andalusite, fused mullite, silicon carbide, mullite hollow balls, pure calcium aluminate cement, aluminum oxide micro-powder, zirconium silicate, tripolycyanamide, and polycarboxylic acid FOX-8H. The castable further comprises nano calcium carbonate, sodium hexametaphosphate and anti-explosion fiber. According to the andalusite self-flow castable disclosed by the invention, raw materials, such as the high-quality andalusite, silicon carbide, various additives and the like are selected. The andalusite self-flow castable is formed by regulating according to repeated tests and feedback after being used by a manufacturer. As the andalusite is transformed to be the mullite at a high temperature, and the vast majority of residual SiO2 in the andalusite is located in mullite crystals. Under a high temperature state, the SiO2 softened in the mullite crystals can absorb the volume variation of the mullite, which is caused by the temperature variation, so that the structure of the mullite formed by the andalusite has better high-temperature volume stability and thermal shock stability.

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 invention discloses a steel ladle cover light mullite castable material including an aggregate and a matrix and including the components in parts by weight: the aggregate comprising 30-70 parts of light mullite balls, and the matrix comprising 0-15 parts of tabular corundum, 0-15 parts of mullite particles, 5-15 parts of an alumina micro powder, 5-15 parts of a mullite micro powder, 0-8 parts of a silicon micro powder, 5-15 parts of a binder, and 0.1-0.4 part of a water reducer. The invention also discloses a preparation method of the steel ladle cover light mullite castable material, wherein the preparation method comprises the following steps: firstly, mixing the matrix parts evenly; and then adding the light mullite balls, and then mixing evenly and packing. The steel ladle cover light mullite castable material has the advantages of simple production, high production efficiency, convenient field construction, low volume density, low thermal conductivity coefficient, excellent thermal shock resistance, high strength, and good high temperature volume stability and the like, and has the use temperature reaching up to 1550 DEG C.

The invention relates to ladle kerb casting material and a ladle kerb preparation method by the ladle kerb casting material. The casting material comprises the following components in weight percentage: 60-82% of ladle lining waste having a grain size of 1-8mm, 10-20% of bauxite grain size of 0.044-1mm, 2-10% of silicon dioxide superfine(less than or equal to 0.02mum), 5-10% of magnesium oxide fine powder grain size of 0.044-0.088 and 0.01-1% of sodium polyphosphate. The preparation method comprises ladle kerb lining waste selecting, crushing, mixing evenly and adding water while stirring, casting, maintaining, baking and the like. The waste ladle kerb casting material is recycled by the preparation method so that the production cost of the fireproof materials and the steel-making cost can be obviously reduced, the economic benefit is improved and the social meaning of protecting environment and saving energy can be realized; the ladle kerb prepared by the ladle kerb casting material has the advantages of good high-temperature volume stability, enough common/ medium/ high temperature strength, strong anti-slag corrosion and anti erosion-corrosion, thus satisfying the requirements for maintaining the normal running of the ladles.

The invention discloses a ceramic roller with the thermal shock resistance and the high-temperature volume stability. The ceramic roller is prepared by selecting kaolin, refractory clay, cordierite, talcum powder, magnesite, silica powder, alumina powder, a corundum-mullite roller clinker, zirconium silicate, barium carbonate and cobalt oxide as main raw materials. According to a finished productof the ceramic roller, the thermal shock resistance (1100 DEG C to room temperature) is greater than or equal to 20 times for no cracking, the bending strength at normal temperature is greater than orequal to 50 MPa, the bending strength at high temperature (1100 DEG C) is greater than or equal to 45 MPa, the thermal expansion coefficient is 3.0-4.0*10<-6>/DEG C (1000 DEG C), and the outer diameter change rate of the roller (1100 DEG C refiring) is less than or equal to 0.1%. The ceramic roller has the advantages that the problem that the bending deformation of a corundum-mullite ceramic roller is easily generated in a quenching zone or an area with great temperature difference can be solved, the thermal shock resistance is good, the high-temperature volume stability is high, the thermalexpansion coefficient is low, the deformation resistance is strong, and the ceramic roller can be widely applied to the quenching zone of a roller kiln.

The invention relates to a silicon carbide brick and a preparation method thereof. According to the silicon carbide brick, silica is used as a main raw material, and is divided into silica powder, silica coarse powder and silica fine powder according to grain diameters. The graphene silicon carbide brick is prepared from silica powder, silica coarse powder, silica fine powder, graphene, composite mineralizer and binding agents including nano-sized chromic oxide and nano-sized titanium oxide. The silicon carbide brick is a graphene silicon carbide brick with excellent thermal shock resistance, strong slag and alkaline metal corrosion resistance, excellent washing resistance, excellent heat-isolation and insulation performance and good high-temperature volume stability; the contact inside the silicon carbide brick is closer due to the graphene, so that the stress generated by expansion when the brick is burnt can be reduced, and the brick is prevented from loosening or cracking; and due to the high strength of the graphene, the excellent mechanical performance of the silicon carbide brick is guaranteed, and the acid and alkali corrosion resistance of the silicon carbide brick can be improved.

The invention discloses an iron-storage type casting material for an iron tapping channel. The casting material is composed of brown corundum, dense corundum, silicon carbide, ball asphalt, alpha-Al2O3, pure calcium aluminate cement, silica micropowder, silicon metal powder, Guangxi white mud, aluminium metal powder, an explosion-proof fiber and FDN. The invention also provides a preparation method of the iron-storage type casting material for the iron tapping channel. The method comprises the steps of mixing the above-mentioned raw materials according to a proportion; stirring the mixture for 10 minutes in a stirring machine; discharging the mixture and packaging. Compared with a conventional technology, the method has the beneficial effects that the casting material is manufactured by employing Al2O3-SiC-C material and a carbon-containing polymer, and has good high-temperature wear resistance, good slag-resistant chemical corrosion performance, high and good oxidation resistance, good thermal shock-resistant stability, good high-temperature volume stability, good explosion resistance, high iron content, high safety coefficient and high slag resistance, sticks no slag iron, is convenient for production, and reduces labor intensity.

The invention discloses a preparation method of calcium hexaluminate. The method includes the following steps that firstly, 40-80 wt% of industrial aluminum oxide powder and 20-60 wt% of aluminate cement are evenly mixed, mixed powder is obtained, the mixed powder is subjected to secondary balling fabrication processing, and green balls are obtained; secondly, after the green balls are dried, the green balls are sintered for 1-5 hours at the temperature of 1650-1800 DEG C, and then the calcium hexaluminate is obtained through smashing and screening. The preparation method of the calcium hexaluminate has the advantages that the technology is simple, cost is low, the production cycle is short, and large-scale industrial production can be achieved. The prepared calcium hexaluminate is high in purity and stable in performance. After the calcium hexaluminate is added into an amorphous fire-resistant material product, the volume density of a fire-resistant material can be effectively reduced, and accordingly the fire-resistant material has the advantages of being good in high-temperature volume stability, heat-preserving and heat-isolation performance, alkali resistance and the like.

The present invention relates to an anticorrosion silicon carbide shelf plate and a preparation method thereof, wherein the anticorrosion silicon carbide shelf plate comprises the following raw materials by mass: silicon carbide particles, silicon carbide coarse powder, silicon carbide fine powder, silicon carbide micro-powder, graphene, a composite antioxidant, a composite binding agent, molybdenum disulfide and a lubricating grease. According to the present invention, the product has characteristics of excellent thermal shock resistance, strong anti-oxidation property, strong slag erosion resistance, strong alkali metal erosion resistance, excellent erosion resistance, excellent thermal insulation and good high temperature volume stability; and the highly uniform dispersion inside the shelf plate can be achieved, the sintering can be promoted, the shelf plate can have the uniform structure, and the strength and the thermal shock resistance of the product can be improved.

The invention discloses special kilneye plastic refractory for cement kilneye, which comprises sillimanite, andalusite, silicon carbide, pure calcium aluminate cement, boron carbide, nanosilicon dioxide, active micro silicon powder and alumina micro powder. The kilneye plastic refractory further comprises aluminum powder, explosion-proof fiber, P530 high efficiency water reducing agent and plasticizing agent. The kilneye plastic refractory selects the raw materials of high-grade sillimanite, andalusite, various additives and the like and is prepared through adjustment based on various experiments and the feedback of factories. As the temperature of mullite converted by sillimanite and andalusite at high temperature is different, densities of substance before and after conversion are different, the volume is changed, and the structure of the mullite formed by sillimanite and andalusite has good high temperature volume stability.

The invention relates to a sandwich type long nozzle sealing piece and a manufacturing method of the sandwich type long nozzle sealing piece. According to the technical scheme, raw materials including 15-55wt% of mullite, 45-85wt% of corundum, 10-50wt% of water glass and 15-35wt% of complex binding agents are evenly mixed and molded by casting, and a rough body (1) formed after casting is shaped like a horn mouth and is naturally dried; then graphite paper (2) is pasted on the inner surface and the outer surface of the dried rough body (1) to form the sandwich type long nozzle sealing piece. The complex binding agent is a mixed solution of resin and ethyl alcohol, and the mass ratio between the resin and the ethyl alcohol is 1/ (4-1). The resin is phenolic resin or epoxy resin or furan resin or polyester resin. The thickness of the graphite paper is 0.2-1.5 mm. The manufactured sandwich type long nozzle sealing piece has the advantages of being good in sealing performance, high in strength, good in high-temperature volume stability, good in erosion resistance and easy to detach.

The invention discloses zirconium silicate-mullite composite wear-resisting castable and a preparation method thereof. The castable is prepared from the following components in parts by mass: 18 to 24 parts of mullite with the size of 1mm to 8mm, 5 to 10 parts of andalusite particles with the size of 3mm to 5mm, 5 to 10 parts of compound ore powder with the grain diameter less than 0.075mm, 5 to 8 parts of ZrO2 with the grain diameter less than 1mum, 3 to 8 parts of silicon micro-powder with the grain diameter less than 1mum, 3 to 5 parts of Al2O3 micro-powder with the grain diameter less than 1.2mum, 3 to 7 parts of calcium aluminate cement, 0.15 to 0.2 part of sodium hexametaphosphate, 0.08 to 0.12 part of a flatting agent, 0.5 to 1.6 parts of heat-resisting steel fibers and 0.2 part of explosion-proof fibers. The zirconium silicate-mullite composite wear-resisting castable disclosed by the invention has the characteristics of high strength, high temperature resistance, good thermal shock resistance, wearing resistance and uneasiness of being cracked; in the aspect of the preparation method, a traditional construction manner is changed and a self flow mode is adopted; the problems of castable segregation and the like, which are possibly caused by vibration construction, are avoided; the zirconium silicate-mullite composite wear-resisting castable is applicable to abnormal-shape parts which are not easy to vibrate, such as coal injection pipes and kiln openings.

The present invention relates to a composite silicon brick and a preparation method thereof, wherein silica rock is adopted as a main raw material, the main raw material silica rock is divided into silica rock particles, silica rock powder, silica rock coarse powder and silica rock fine powder according to the particle size, and the composite composition comprises silica rock particles, silica rock powder, silica rock coarse powder, silica rock fine powder, graphene, nanometer silica, a composite mineralization agent, a binder and nanometer zirconia. According to the present invention, the composite silicon brick has characteristics of excellent thermal shock resistance, strong slag erosion resistance, strong alkali metal erosion resistance, excellent erosion resistance, excellent thermal insulation and good high temperature volume stability; with the graphene, the internal contact of the brick is close so as to reduce the stress generated by expansion during the firing and prevent the product from loosening or cracking; and with the high strength of the graphene, the excellent mechanical property of the silicon brick is ensured, and the acid-alkali corrosion resistance of the silicon brick can be enhanced.

The invention discloses a method for laying the bottom of a prefabricated block ladle by using small building blocks. The method comprises the following steps of: vertically laying the bottom with small upright prefabricated blocks after an inner lining of the wall of the ladle is laid; reserving a gap of 40 to 50mm between the periphery of the bottom and the wall; and filling the gap with corundum-spinel castable and laying two layers of bricks along an annular joint of the bottom and the wall after the bottom is laid. The method has the advantages that: 1, the upright small prefabricated blocks are fired at high temperature, have high strength and low residual moisture, are suitable for rapid baking and quicken the turnover of the ladle; 2, because the bottom of the ladle is formed by laying a plurality of upright small fabricated blocks, the thermal stress can be uniformly dispersed during use and the bottom of the ladle has high high-temperature volumetric stability; 3, a comprehensive laying process is flexibly used to prolong the comprehensive ladle life of the ladle; 4, the bottom of the ladle is convenient to disassemble and maintain, and partial maintenance or replacement is realized; and 5, the use safety of the ladle is improved and a steel drilling accident of the bottom is prevented.

The invention relates to the technical field of lost foam casting, in particular to low-carbon-residue high-temperature-creep-resisting lost foam casting water-based paint with a nanophase ceramic powder solution enhancement function and a preparation method of the water-based paint. According to the paint, high-alumina bauxite and microporous light mullite which are different in particle size are mixed as refractory aggregate, and good air permeability, the low heat conduction coefficient and good high-temperature volume stability are achieved; by means of a mixed suspending agent prepared from a transparent nanophase ceramic powder solution, clay powder, sodium carboxymethylcellulose and other materials, the suspension property of the materials is improved, and the effects of enhancement, toughening and the like are achieved; and added nano ceric oxide has the oxygen storage capacity, oxygen can be released in the pouring process, the oxidization combustion efficiency of plastic is improved, and carbon residues are reduced. The prepared paint is compact and smooth in coating, resistant to high-temperature creep, stable in forming, not likely to collapse or break and easy to clean, and a prepared casting is fewer in impurity on the surface and better in quality.

The invention discloses a wear resistant pouring material for a garbage treatment kiln and a preparation method thereof, wherein the wear resistant pouring material includes the following components by mass: 30-50 parts of 15-0mm A88 spinel, 15-25 parts of 10-5mm A95 spinel particles, 5-10 parts of composite inorganic powder with the particle size of 0.076-0.088mm, 5-8 parts of zirconium gel powder with the particle size of 2-100mu m, 3-8 parts of silicon micro powder with the particle size less than 1 mu m, 3-5 parts of Al2O3 micro powder with the particle size less than 1.2 mu m, 1-3 parts of Portland 625 cement, 3-8 parts of magnesium sol, 0.12 part of sodium pyrophosphate, 0.15 part of a defoaming agent, 0.3 part of explosion-proof fiber and 0.2 part of aluminum carbonate; and the composite wear resistant pouring material has the characteristics of uniform structure, high strength, high temperature resistance, good thermal shock resistance and easy construction.

The invention relates to a method for preparing a light periclase-magnesium aluminate spinel composite material in an in-situ decomposition manner. The technical scheme is as follows: firstly 85wt% to 98wt% of magnesium-aluminum hydrotalcite, 2wt% to 12wt% of water and 0 to 4wt% of binding agent are mixed, uniformly stirred and then molded; then a molded green body is dried for 4h to 24h under the condition of 110DEG C, thermally insulated for 1-8h under the condition of 1000DEG C to 1800DEG C and then cooled to obtain the light periclase-magnesium aluminate spinel composite material, wherein the granularity of the magnesium-aluminum hydrotalcite is less than or equal to 0.5mm, and the content of Mg(4-6)Al2(OH)(12-16)(CO3).4H2O is more than or equal to 90 percent by weight. The preparation process is simple. By adopting the method, the light periclase-magnesium aluminate spinel composite material with a uniform organization structure can be obtained. The prepared composite material has the characteristics of small volume density, high strength, excellent corrosion resistance, good high-temperature volume stability and excellent thermal-shock stability, can be used as a raw material for producing high-temperature ceramics and fire-resistant materials and can also be used as a light excellent fire-resistant material.