14 results about "Andalusite" patented technology

The invention relates to the technical field of metallurgical coking, and provides a devitrification and CO erosion resistant zero-expansion silica brick and a preparation method thereof.The devitrification and CO erosion resistant zero-expansion silica brick is prepared from, by weight, 3-10 parts of nanoscale alpha-Al2O3, 15-35 parts of andalusite, 30-40 parts of high-purity fused mullite, 10-20 parts of superfine silica powder, 2-5 parts of silica sol binding agent and 3-5 parts of composite mineralizer. Through the synergistic effect of the design of the composite mineralizer and the stepped heat treatment process, the technical problems that the existing zero-expansion silica brick is easy to devitrify and crystallize fused quartz, poor in CO erosion resistance and lack of crystallization degree during long-term use at high temperature are solved; the thermal shock cycle index and the high-temperature breaking strength of the material can be improved, the formation of alpha-cristobalite crystallization peak is effectively inhibited, and the mass loss is reduced in a reducing atmosphere, so that the structural stability of the material is enhanced, and the service life of the material is prolonged.

This invention belongs to the field of refractory material preparation technology, specifically relating to a refractory brick and its preparation method. The refractory brick of this invention uses calcined bauxite and fused white corundum as the main raw materials, providing a high-strength refractory skeleton to ensure the basic compressive strength of the refractory brick. The addition of kyanite and andalusite, through a kyanite-andalusite composite, achieves gradient control of the expansion rate; kyanite rapidly responds to mid-temperature shrinkage, while andalusite sustains high-temperature expansion, synergistically achieving volume stability. Secondary alumina ash, hematite tailings, and serpentine tailings are also added to the raw materials to promote the formation of magnesium iron spinel and mullite phases; lanthanum oxide, yttrium aluminum garnet, titanium silicon carbide, and yttrium titanate are added to further improve the strength and crack resistance of the refractory brick; calcium hexaaluminate micron powder, p-Al2O3 micron powder, and deionized water are used as composite binders. Thus, the synergistic effect between the raw materials ensures that the prepared refractory brick has excellent strength and crack resistance.

The invention discloses a low-porosity, low-iron and low-creep clay brick and a preparation method thereof, and relates to the technical field of refractory materials, and the low-porosity, low-iron and low-creep clay brick comprises the following components in parts by weight: 30-45 parts of a mullite homogenized material, 12-20 parts of Anhui flint clay, 8-10 parts of sillimanite, 15-25 parts of kaolin, 10-20 parts of andalusite powder, 3-5 parts of raw silicon powder, 2-5 parts of potassium feldspar powder and 0.2-0.5 part of hydroxypropyl methyl cellulose. And 3-6 parts of an aluminum dihydrogen phosphate solution. The high-quality clay brick with low porosity, low iron, low creep deformation and high strength is successfully prepared by optimizing the raw material ratio and a composite binding agent system, and the high-quality clay brick is suitable for high-temperature industrial kilns with harsh performance requirements.

The invention relates to the technical field of refractory bricks, in particular to a microporous silicon carbide abrasive brick for a garbage high-temperature cracking furnace, which comprises the following components in percentage by weight: 10-20% of mullite; 10 to 15% of andalusite; 3 to 5 percent of alpha-Al2O3 micro powder; 8 to 12% of kaolinite; 7 to 9% of bauxite; 4-6% of modified phosphate tailing ceramsite; 1-3% of a binding agent; 0.5-1% of an infrared opacifying agent; silicon carbide: the balance; the preparation method of the microporous silicon carbide wear-resistant brick comprises the following steps: S1, preparing a material A, a material B and a material C; s2, preparing a pre-pressed brick; s3, preparing a molded brick; and S4, obtaining a finished product. According to the silicon carbide brick prepared by the invention, the modified phosphate tailing ceramsite is added, so that molten metal or furnace slag can be prevented from permeating at high temperature; the infrared opacifying agent is added, so that middle and far infrared radiation can be reflected, the heat efficiency of the hearth is improved, a structure with a compact surface layer and a porous middle part is formed through differential proportioning of the brick body, and strength and functionality are both considered.

The present invention relates to the technical field of refractory materials, and provides a tundish thermal insulation refractory material, which comprises the following raw materials by weight: 5-40 parts of alumina hollow spheres, 5-40 parts of hollow ceramsite, 5-30 parts of waste clay bricks, 10-20 parts of flint clay powder, 1-5 parts of refractory clay, 5-20 parts of andalusite powder, 5-20 parts of refractory cement, 0.1-0.5 part of a water reducing agent, 0.1-0.5 part of melamine, 0.5-1 part of alum, and 0.2-0.3 part of benzamidoxime. Through the technical scheme, the problem of insufficient strength of the refractory material for heat preservation of the tundish in related technologies is solved.

The invention discloses a andalusite high-temperature push plate and a preparation method thereof. The preparation method comprises the following specific steps: mixing the andalusite particles, the fused quartz particles, the andalusite fine powder, the cordierite fine powder, the activated aluminum oxide fine powder, the aluminum-silicon alloy powder and the rare earth composite yttrium-zirconium ceramic powder to obtain a premix; adding the modified aluminum sol into the premix, and stirring to obtain a mixture; carrying out compression molding on the mixture to obtain a green material; and drying and roasting the green body material, and cooling to room temperature to obtain the andalusite high-temperature push plate. Wherein the modified aluminum sol is obtained by uniformly mixing boric acid and aluminum sol. The preparation method is simple in technological process, low in sintering temperature and obvious in energy-saving benefit, the prepared andalusite high-temperature push plate is high in density, low in apparent porosity, high in high-temperature strength, good in thermal shock resistance and high in refractoriness under load, and the service performance of the high-temperature push plate is improved.

The application relates to the technical field of refractory materials, and discloses a kind of intermediate ladle heat preservation refractory materials, including the following weight parts component raw materials: alumina hollow ball 5~40 parts, hollow ceramic 5~40 parts, waste clay brick 5~30 parts, coke spar powder 10~20 parts, refractory clay 1~5 parts, andalusite powder 5~20 parts, refractory cement 5~20 parts, water reducing agent 0.1~0.5 parts, melamine 0.1~0.5 parts, alum 0.5~1 part, benzamide oxime 0.2~0.3 parts.Through the above technical scheme, the problem of insufficient strength of the intermediate ladle heat preservation refractory material in the related art is solved.

The invention belongs to the technical field of refractory materials, and relates to a comprehensive anti-carbon deposition method based on glass phase regulation and composite phase synergistic strengthening, which comprises the following steps: introducing a B2O3 source as a glass phase and andalusite as a synergistic strengthening phase in the preparation process of a refractory material, and mixing the B2O3 source and the andalusite to uniformly distribute a boron source and a composite phase in a green body; in the sintering and high-temperature service process, multiphase components in the system are subjected to a synergistic reaction, and a composite anti-carbon deposition system with chemical passivation and structure sealing functions is formed; the specific method comprises the following steps: mixing a refractory raw material, soft clay, a binding agent, a B2O3 source and andalusite, and reacting the B2O3 source with Fe2O3 and SiO2 components in a sintering stage to form a low-melting-point B2O3-Fe2O3-SiO2 eutectic glass phase; and andalusite is used as a second phase strengthening component. According to the invention, the systematic anti-carbon deposition strengthening of the alumina-based refractory material in the CO atmosphere from the chemical reaction level to the microstructure level is realized, and the anti-carbon deposition performance and the service stability of the material are obviously improved.

The application discloses an enhanced high-temperature wear-resistant and refractory castable, which comprises the following raw materials in parts by weight: high bauxite 84.5-93.6 parts, andalusite 21.4-25.3 parts, silicon oxide micro powder 32.5-37.8 parts, silicon nitride micro powder 23.8-26.2 parts, aluminum tripolyphosphate 6.8-9.2 parts, aluminum oxide micro powder 6.3-10.5 parts, attapulgite clay 1.5-3.2 parts, calcium aluminate cement 11.5-22.4 parts, modified short basalt fiber 15.6-18.4 parts, water reducing agent 5.7-6.5 parts, and silica sol 1.5-3.2 parts; and the application further discloses a preparation method of the enhanced high-temperature wear-resistant and refractory castable; the high bauxite and the andalusite are used as the aggregate, the weight and the thermal conductivity of the castable are reduced, the strength of the castable is improved, the modified short basalt fiber has the advantages of light volume weight, high temperature resistance, good thermal stability, low thermal conductivity, small heat capacity, good mechanical vibration resistance, small thermal expansion, and good heat insulation performance, and the compactness of the castable is further improved.

The invention discloses a mullite silicon carbon composite brick and a preparation method thereof. The mullite silicon carbon composite brick is prepared from 30 to 55 parts of mullite, 10 to 30 parts of sintered corundum, 5 to 20 parts of SiC, 10 to 35 parts of andalusite mineral, 3 to 10 parts of alpha-Al2O3, 3 to 7 parts of high-quality binding clay and 1 to 5 parts of composite antioxidant. The invention has the following beneficial effects: mullite is taken as a main component, so that the high-temperature-resistant mullite refractory material has excellent stability in a high-temperature environment, can be used for a long time at a temperature of 1550 DEG C or above, and does not generate performance reduction phenomena such as softening and creep deformation; by adding specific carbon, silicon and rare earth elements into the mullite silicon-carbon composite brick, the mullite silicon-carbon composite brick can effectively resist chemical erosion of molten steel and slag and protect a steel ladle lining from being damaged; the microcosmic ceramic structure formed in the preparation process of the mullite silicon-carbon composite brick is uniform and compact, so that the material is endowed with high mechanical strength and thermal shock resistance, and the mullite silicon-carbon composite brick can bear the pressure and impact of molten steel in a steel ladle.

The invention discloses a low-carbon magnesia-carbon refractory material with high thermal shock resistance and slag corrosion resistance and a preparation method thereof, and relates to the technical field of magnesia-carbon refractory materials. The refractory material comprises the following components in parts by mass: 40-45 parts of 3-5mm fused magnesite, 20-25 parts of 1-3mm fused magnesite, 10-15 parts of fused magnesite less than or equal to 1mm, 8-12 parts of silicon powder, 5-8 parts of a composite additive, 4-6 parts of crystalline flake graphite and 3-5 parts of phenolic resin, and the composite additive is prepared from the following raw materials: alumina powder, lanthanum oxide powder and low-grade andalusite. Impurity phases in the low-grade andalusite are directionally converted into high-melting-point spinel, mullite and rare earth lanthanum aluminate by utilizing the aluminum oxide powder and the lanthanum oxide powder, so that the problem that the low-grade andalusite is difficult to apply in a metallurgical refractory material is solved, and meanwhile, the low-grade andalusite and the andalusite are coordinated to regulate and control the ceramic phase structure and distribution of the refractory material; the thermal shock resistance and the slag corrosion resistance of the refractory material are obviously improved.

The present application relates to the field of oil and gas well cementing engineering, and discloses a cement strength stabilizing material, an oil well cementing cement slurry system and application thereof.The cement strength stabilizing material comprises 30-80 parts by weight of a first strength stabilizing material and 20-70 parts by weight of a second strength stabilizing material; wherein the first strength stabilizing material is a mixture of quartz sand and glass powder; and the second strength stabilizing material is a mixture of at least two selected from spodumene, andalusite, olivine, leucite, garnet, pyrope, almandine, grossular, epidote, nepheline, staurolite, spinel and graphite.The cement slurry system containing the cement strength stabilizing material of the present application is suitable for both high-temperature direct forming working conditions of deep wells and super-deep wells and low-temperature forming and high-temperature service working conditions of heavy oil steam production, has good comprehensive performance, and has a broad market application prospect.

The invention discloses a silicon carbide modified anti-seismic high-alumina brick and a preparation method thereof. The high-alumina brick is prepared from the following components: 50-70 parts of bauxite, 22-32 parts of andalusite fine powder, 3-8 parts of composite silicon carbide powder, 3-8 parts of hollow glass beads and 10-15 parts of an organic binding agent, the composite silicon carbide powder comprises silicon carbide as well as a SiO2 transition layer, an ester modified layer and a resin blend layer which are sequentially coated on the surface of the silicon carbide from inside to outside, according to the invention, the interface stability is improved through the SiO transition layer; the ester modified layer enhances interface bonding and buffers stress; and the resin blend layer efficiently dissipates vibration energy, so that the anti-seismic effect is improved. The three components cooperate to significantly improve the anti-seismic durability and fracture resistance of the high-alumina brick.

The preparation method comprises the following steps: mixing bauxite, white corundum, andalusite, aluminum oxide micro powder, nano silicon dioxide, pure calcium aluminate cement silicon micro powder and a water reducing agent to prepare a refractory matrix; mixing nanoscale silicon dioxide, nanoscale aluminum oxide, cerium oxide, lanthanum oxide and water, and stirring to obtain a second mixture; mixing nanoscale silicon dioxide, nanoscale aluminum oxide and water, and stirring to obtain a third mixture; aluminum oxide, silicon dioxide, silicon carbide, calcium oxide and water are mixed and stirred, a fourth mixture is obtained, in a mold, the second mixture, the third mixture and the fourth mixture are sequentially laid from bottom to outside, forming is conducted, and an anti-erosion heat insulation base body is obtained; and fixing the anti-erosion heat insulation substrates in the corresponding grooves, spraying and coating nano coatings on the refractory substrate and the anti-erosion heat insulation substrates, and curing to obtain the gradient structure composite board for the rotary kiln.