152results about How to "High softening temperature under load" patented technology

The invention relates to a mafic-magnalium compound spinel brick and a preparation method thereof. The raw materials comprise 20-55% of high iron magnesia sand with granularity of 5-3mm, 10-45% of high iron magnesia sand with granularity of less than 2mm, 20-45% of high iron magnesia sand with granularity of less than 0.088mm, 4-35% of magnalium spinel with granularity of not more than 5mm, and 2-4% of bonding agent. The preparation method comprises the following steps of: weighing the raw materials, wet milling, shaping, drying and sintering; drying the brick blank for 8-24h at the temperature of 110-160 DEG C; heating to the temperature of 1600-1700 DEG C; warming for 3-12h at the temperature of 1600-1700 DEG C and taking out. The product comprises the main components of 73-95% of MgO, 3-15% of Al2O3 and 2-12% of Fe2O3. The mafic-magnalium compound spinel brick has good product performance, high load softening temperature, high pressure resistance intensity, good thermal shaking stability and good alkali corrosion resistance, and is an ideal material for cement kiln high temperature belts. The mafic-magnalium compound spinel brick can substitute the current magnesia-chromite fire-proof material and is a new environmentally-friendly alkali fire-proof material.

The invention discloses a high-strength steel fibre castable which is prepared by the following raw materials in parts by weight: 2.5 parts of bauxite material with the granularity of 8-5mm, 2.3 parts of bauxite material of which the granularity is more than 0.075mm and is less than 5mm, 2 parts of brown aluminium oxide particle material with the granularity of 3-1mm, 0.8 part of bauxite material of which the granularity is less than or equal to 0.075 mm, 0.4 part of alumina submicron powder of which the granularity is less than or equal to 0.025 mm, 0.6 part of carborundum powder of which the granularity is less than or equal to 0.075 mm, 0.3 part of silica micropowder of which the granularity is less than 0.019 mm, 0.6 part of CA-70 cement, 0.5 part of brown aluminium oxide powder of which the granularity is less than 0.053 mm, 0.2 part of No. 446 heat-resistant steel fiber, 0.02 part of anti-explosion steel fiber, sodium tripolyphosphate accounting for 0.1% of total material weight and sodium hexametaphosphate accounting for 0.08% of total material weight. The product has high compression strength, high breaking strength, high refractoriness under load and favorable thermal shock resistance stability, has the characteristic of microdilatancy at high temperature and has the advantages of favorable wear-resisting property and the like.

The invention relates to pleonaste-hercynite bricks and a preparation method thereof. The pleonaste-hercynite bricks are prepared from the following raw materials in percentage by weight: 55 to 98 percent of high-iron magnesia with a particle size of less than or equal to 5 millimeters, 2 to 45 percent of hercynite with a particle size of less than or equal to 5 millimeters and 2 to 4 percent of binding agent. The preparation method comprises: weighing raw materials; rolling wet materials; forming; drying; firing; drying the fired bricks at 110 to 160 DEG C for 8 to 24 hours; heating the bricks to 1,550 to 1,700 DEG C; keeping the temperature for 3 to 15 hours; and taking the bricks out of kiln. The pleonaste-hercynite bricks have high performance, high refractoiness under load, high thermal shock resistance, high alkaline corrosion resistance and high kiln-crust sticking performance, are free from hydration and easy to transport, are ideal materials for the high-temperature zone of acement kiln and can be used in place of the conventional magchrome refractory material.

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 relates to a method for preparing a refractory shed plate, belonging to the technical field of refractory materials. The method comprises the steps of dosing, molding and sintering; coarse and fine material collocation; isostatic pressing and high temperature sintering. In the preparing process, the product has the advantages of difficulty in cracking and deformation, high production efficiency, high yield and low manufacturing cost; and the prepared product has the advantages of uniform organization structure, no internal crack, high strength at high temperature, high refractoriness under load, good thermal shock resistance and long service life; and kiln furniture consumption is largely reduced.

The invention discloses a manufacturing method of a refractory brick. According to the manufacturing method, low-and-medium-grade andalusite (the contents of Al2O3 are 53%, 55% and 57%) are used as main raw materials, large and intermediate andalusite particles are replaced with large mullite particles and intermediate cordierite particles, and corundum, alpha-Al2O3 micropowder and SiO2 micropowder and combining clay and waste paper pulp are added. The preparation method comprises the following steps of: mixing the ingredients in a wet pan mill evenly and then discharging out of the mill; forming by a frictional brick press; drying the formed green blanks in a dryer; calcining the dried blanks in a calcining kiln, wherein the highest calcining temperature ranges from 1370DEG C to 1400DEG C. The refractory brick obtained by adopting the method can effectively solve the problems of the conventional refractory brick, such as high manufacturing cost, low load softness, large creepage, poor anti-seismic property and short service life; the appearance defects of the refractory brick are fewer, and the refractory brick can be widely applied in a ceramic burner of an ironmaking blast-furnace hot blast stove.

The invention relates to a refractory material, in particular to a zirconium mullite red brick and a preparation technology thereof. According to the zirconium mullite red brick provided by the invention and a product prepared due to the adoption of the preparation technology, a refractory brick is prepared by adding a phosphoric acid solution; according to the refractory brick, the temperature of a kiln shell can be effectively reduced, the refractory brick is long in service life, resistant to abrasion and high in anti-erosion ability, and particularly the times of thermal shock resistance reach more than 40; the operating temperature range of the product is between 1400 DEG C and 1550 DEG C, and the maximum allowable temperature is 1600 DEG C; at a high-temperature operating state, the product has high strength, erosion resistance, high-wearing feature, high thermal shock resistance, low heat conductivity coefficient and higher refractoriness under load.

The invention discloses a high-strength thermal-shock-resistant refractory brick. The high-strength thermal-shock-resistant refractory brick is characterized by being prepared from the following raw materials in parts by weight: 16-20 parts of fused corundum powder, 12-16 parts of tabular corundum, 48-52 parts of aluminum oxide micro powder, 2-6 parts of magnesia fine powder, 2-6 parts of zirconium dioxide powder, 1-4 parts of silicon carbide, 1-4 parts of silica powder, 2-6 parts of sodium silicate, 2-6 parts of andalusite powder, 1-2 parts of a titanium boride additive, 5-15 parts of sillimanite fine powder, 5-8 parts of Guangxi clay, 10-15 parts of waste iron trough materials and 10-15 parts of waste silicon mullite bricks. The material proportion of the refractory brick is optimized, and the refractory brick is good in high temperature resistance, corrosion resistance and thermal shock resistance, improves refractoriness under load, is not liable to have cracks and damages in use, and prolongs the service life.

The invention discloses a fireproof composition product of cement rotary kiln transmitting belt through dried method, which comprises the following parts: 50-79% alumina clinker aggregate with Al2O3 not less than 90% and bulk density not less than 3.0g/cm3, 5-20% silicon carbide, 3-15% clay with Al2O3 not less than 32%, 3-15% alumina, wherein the silicon carbide, clay and alumina are added at 0.1-10mm fined powder pattern, which possesses 63-75% Al2O3,8-32.5% SiO2 and 4.5-19% SiC for sintered components.

The invention relates to a porous periclase-forsterite multiphase material and a preparation method thereof. The method comprises steps as follows: 48wt%-85wt% of a magnesium oxide raw material and 15wt%-52wt% of a silicon dioxide raw material are evenly mixed to form a mixed raw material, an additive accounting 3wt%-12wt% of the sum of mass percentages of raw materials is added, mixed mud is obtained after even stirring and poured in a mold to be mechanically pressed under 80-130 MPa, a blank is obtained, baked at 100-180 DEG C for 3-10 h and calcined at 1,500-1,750 DEG C for 1-16 h in a high-temperature furnace, and the porous periclase-forsterite multiphase material is prepared. A sintering in-situ pore forming technology is adopted, the production process is pollution-free, and the obtained product has the characteristics of high refractoriness under load, stable size, staggered pore structure, good thermal insulation effect and capability of being used at the high temperature of 1,500-1,700 DEG C for a long time.

The invention relates to a bauxite-based slight expansive high-alumina brick for ladles and a preparation method thereof and the material components and weight percentage are as follows: bauxite clinker between 5mm to 3mm accounting for 10 percent to 15 percent, bauxite clinker between 3mm to 1mm accounting for 20 percent to 30 percent, bauxite clinker between 1mm to 0mm accounting for10 percent to 20 percent, andanlusite less than 0.5mm accounting for 0 to 20 percent, sillimanite less than 0.088mm accounting for 0 to 15 percent, kyanite less than 0.2mm accounting for 0 to 10 percent, bauxite clinker less than 0.088mm accounting for 20 percent to 40 percent, Alpha-Al2O3 less than 320 mesh accounting for 0 to 5 percent and applied sulfurous acid paper pulp waste liquid accounting for 3 percent to 5 percent. The preparation method comprises the following steps: a. the bauxite clinker is crushed; b. the powders are magnetically selected; c. calendering is carried out on the bauxite clinker, the andanlusite, the sillimanite, the kyanite, the Alpha-Al2O3 and the applied sulfurous acid paper pulp waste liquid after mixing according to a ratio; d. the pug after calendering is shaped; e. the shaped pug is dried for 48hours; and f. the pug is sintered at the temperature of 1500 DEG C and the temperature is preserved for 6 to 8 hours. The preparation method can leads to the slight expansion of high-alumina bricks in use to avoid the flaking of bricks and the service life of bricks can be improved by 30 percent to 50 percent.

The invention provides a preparation method of a magnesium aluminate spinel brick, wherein the preparation method comprises the specific steps: A, mixing evenly magnesia particles, a corundum fine powder and a binder, then granulating, carrying out heat treatment, and screening to obtain a material A and a material B; B, mixing a magnesia fine powder, a corundum fine powder, a magnesium aluminate spinel fine powder and a binder evenly, carrying out heat treatment, then crushing and screening to obtain a material C and a material D; C, mixing evenly the material A, the material B, the material C, the material D, a magnesium aluminate spinel fine powder, a magnesia fine powder, a corundum fine powder and a binder, and then carrying out heat treatment, to obtain the magnesium aluminate spinel brick. The method is beneficial for close contact of all kinds of raw material particles, but also makes full use of structural characteristics of materials at different temperatures; the prepared magnesium aluminate spinel brick has excellent characteristics of high room-temperature compressive strength, high thermal shock stability, high load softening temperature, and low reburning line change rate.

The invention provides a fireproof material. The fireproof material is prepared from the following components in percentage by mass: 48-62 percent of andalusite, 20-35 percent of sillimanite, 4-8 percent of aluminum oxide, 5-15 percent of corundum, 2-6 percent of combined clay, 1-3 percent of silica powder, 0.5-1.5 percent of paper pulp powder and 0.1-0.3 percent of a water reducing agent. In the fireproof material prepared from the high-purity andalusite and sillimanite, the high-purity corundum and the high-purity aluminum oxide are also added for strengthening a base material so that a main crystal phase mullite in the base material is columnar, long column-shaped or needle-shaped and a special network structure is formed; meanwhile, the needle-column-shaped mullite in the base material forms an interlaced network structure with the andalusite and the sillimanite, so the fireproof material disclosed by the invention is extremely good in thermal shock resistance and stability, relatively high in refractoriness under load (higher than 1700 DEG C) and relatively low in creep rate (0.125%). The invention also provides a preparation method of the fireproof material and a fireproof brick.

An erosion-resistant high-temperature refractory brick for waste liquid incineration includes the following materials by the weight percentage: 10-35% of 5 mm-3 mm tabular corundum particles, 20-98% of 3 mm-1 mm tabular corundum particles, 5-25% of 1 mm-0 mm tabular corundum particles, 20-98% of 320 mesh tabular corundum powder, 5-30% of 80 mesh zirconia, 2-15% of chromium oxide green and 2-13% ofhigh temperature alpha-alumina micro-powder. The erosion-resistant high-temperature refractory brick has the advantages of high load softening temperature, good thermal shock resistance, high corrosion resistance at room temperature and high temperature, good wear resistance, good thermal conductivity, and excellent resistance to waste liquid erosion, and is especially suitable for solution molten slag corrosion invasion of a high temperature melting furnace.