32results about How to "Improve alkali corrosion resistance" patented technology

The invention discloses a wear-resistant aluminum alloy which consists of the following components in percentage by weight: 11-13% of silicon, 4-6% of magnesium, 0.1-0.2% of chromium, 0.2-0.4% of titanium, 0.04-0.08% of manganese, 0.1-0.18% of ytterbium, 0.1-0.15% of tungsten and the balance of aluminum. By adopting the composition, the hardness of the wear-resistant aluminum alloy can be obviously improved by about 30% from about 490 before to about 620, and the alkali corrosion of the obtained alloy is obviously improved.

The invention provides thermal conductive graphite blocks for a blast-furnace bottom and a hearth, belonging to the technical field of carbon refractory. The raw materials of the graphite blocks comprise the following components in parts by weight: 11-15 parts of petroleum coke with grain size of more than 2mm and less than or equal to 4mm, 10-14 parts of petroleum coke with grain size of more than 1mm and less than or equal to 2mm, 53-60 parts of petroleum coke with grain seize of more than 0.075mm and less than or equal to 0.15mm, 34-40 parts of petroleum coke with grain seize of less than or equal to 0.075mm, and 22-25 parts of mesothermal asphalt. In the formula of the thermal conductive graphite blocks for the blast-furnace bottom and the hearth, high-quality needle cokes with higherintensity and easy graphitization are used, a small grain formula is adopted, and a high-pressure multi-soaking and multi-baking method is adopted, so that an impregnant can penetrate through the holes of the graphite blocks, thus reducing the porosity of the graphite blocks, improving the compactness, volume density and intensity of the products, improving the coefficient of heat conductivity and alkali-resistant corrodibility of the graphite blocks greatly, fundamentally solving the problem of low coefficient of heat conductivity of the graphite blocks, and meeting the requirement on quality of the graphite blocks with high thermal conductivity for large blast furnaces.

The invention discloses a sound absorption noise reduction thermal insulation wallboard. On the one hand, soybean straw fibers are subjected to high temperature steam pretreatment, then part of pectin is removed, acetic acid is added, acetylation treatment is carried out, free hydroxide radicals in cellulose are enclosed, the hydrophobic performance and the thermal stability of the material are raised, then a waterproof agent immersion method is employed for processing, the material water absorption is lowered, the alkali corrosion resistance of the material in a cement-based material is raised and the capability of resisting microorganisms from depolymerization is raised. On the other hand, river sludge, phosphogypsum powder and the like are modified, utilized, and blended with nano tin antimony oxide and polypropylene , granulation is carried out, the intensity and the toughness of the product are raised, the product is not easy to fracture, the thermal insulation wallboard prepared according to the method is low in cost, the added modified soybean straw fibers can absorb released energy when a cement-based material cracks, therefore extension of the crack in the cement-based material is stopped, namely, the toughness of the material is raised, the compression toughness index is raised, and the provided thermal insulation wallboard has advantages of high hardness, sound absorption, noise reduction, thermal insulation, good adsorbability and the like.

The invention discloses a high-wear-resistance Guimo brick and a preparation method thereof, belonging to the field of refractory materials. The high-wear-resistance Guimo brick is prepared from the following components in percentage by weight: 20-30% of bauxite with the particle size of smaller than 0.1mm, 5-15% of bauxite with the particle size of greater than or equal to 0.1mm and smaller than 1mm, 30-40% of bauxite with the particle size of greater than or equal to 1mm and smaller than 3mm, 5-8% of bauxite with the particle size of greater than or equal to 3mm, 15-20% of silicon carbide, 2-4% of alpha-Al2O3 micropowder, 3-4% of silicon micropowder and 3-5% of nano metal aluminum powder. The preparation method comprises the following steps: slurry making, forming, drying and firing. The high-wear-resistance Guimo brick has the advantages of balanced particle size proportion, compact structure, high bonding strength and firing strength, excellent wear resistance, favorable thermal shock resistance, low heat conductivity, high refractoriness under load and long service life.

The invention provides a preparation method of a prefabricated component at a kiln port used for a cement kiln, which can solve the problem of low service life of the current prefabricated component. The method comprises the following steps: stirring and mixing, casting and moulding, demoulding, maintaining, and processing under high temperature. The prefabricated component has the advantages of good volume stability, corrosion resistance and high temperature mechanical property, on-site assembling enables more simple and easier construction, steps of on-site stirring, casting or ramming can be directly omitted, construction time is saved, a construction field of a cement rotary kiln can not be influenced by construction environment and season due to installation of the prefabricated component at the kiln port, construction quality is ensured, and usage life of the kiln port can be effectively prolonged. The prefabricated component can be taken as an inner liner material, on-site construction disadvantage of pouring materials can be solved, construction quality can be fully ensured, quality problem due to nonstandard construction can be greatly reduced, and usage life of the kiln port can be greatly prolonged.

The invention discloses an aluminum alloy for heat exchange and a production method thereof, and belongs to the technical field of light alloy materials. The aluminum alloy is prepared from, by weight, not larger than 0.015%, not larger than 0.015% of Fe, not larger than 0.005% of Cu, 0.95% to 1.05% of Mg, 0.25% to 0.35% of Mn, 0.05% to 0.12% of Sn, 0.05% to 0.15% of Zr, 0.10% to 0.20% of Er, 0.05% to 0.10% of La, 0.10% to 0.15% of Ce and the balance Al and inevitable impurities. Smelting is carried out through a vacuum intermediate frequency coreless induction furnace, secondary foamed ceramic filtering is carried out under argon pressure maintaining, and the aluminum alloy is continuously cast and extruded into a needed heat exchange pipe with a 90-degree wrap angle in a quantitative CASTEX manner. The problem that due to the fact that metal ions of Cu, Cr, Zn, Ni, Ag, Hg, Pb, Co and other elements are contained in an existing aluminum alloy for a heat exchanger and complexly react with ammonia, the aluminum alloy cannot be applied to the heat exchanger with ammonia as a refrigerant is solved. The aluminum alloy has good corrosion resistance, plasticity and breaking tenacity, high thermal conductivity, long-term heat resistance and other properties. The aluminum alloy is widely used for industrial refrigeration with ammonia as the refrigerant, waste heat utilization, air conditioning, chemical industry, heat-pump water heaters and other heat exchangers.

The invention discloses wear-resistant aluminum alloy. The wear-resistant aluminum alloy comprises, by weight, 12-13% of silicon, 6-7.3% of magnesium, 0.2-0.27% of vanadium, 0.3-0.35% of titanium, 0.4-0.6% of cobalt, 0.6-0.76% of cerium, 0.1-0.15% of ytterbium and the balance of aluminum. The hardness of the wear-resistant aluminum alloy can be improved evidently by about 18% and is increased from the original about 490 to about 580, and alkali corrosion resistance of the wear-resistant aluminum alloy is also increased evidently.

The invention provides a wear-resisting aluminum alloy. The wear-resisting aluminum alloy is composed of the following elements of, by mass, 8-12% of silicon, 1.5-3.5% of copper, 2-4% of magnesium, 0.5-0.7% of zinc, 0.2-1% of boron, 0.5-1.2% of iron, 0.1-0.5% of titanium, 0.4-0.8% of manganese, 0.5-1% of antimony, 0.2-0.38% of osmium, 0.15-0.25% of iridium and the balance aluminum and impurities.All the elements in the wear-resisting aluminum alloy mutually synergistically act, the wear-resisting property and hardness of the aluminum alloy are enhanced, the hardness of the wear-resisting aluminum alloy is 590-610, and the alkali-corrosion-resisting property of the wear-resisting aluminum alloy is also remarkably improved.

The invention provides a wear-resistance aluminum alloy. The wear-resistance aluminum alloy consists of the following elements in percentage by mass: 5-10% of silicon, 1-3.5% of copper, 2-4% of magnesium, 0.5-0.7% of zinc, 0.2-1% of boron, 0.1-0.5% of cobalt, 0.4-0.8% of nickel, 0.1-0.5% of titanium, 0.4-0.8% of manganese, 0.5-1% of antimony, 0.2-0.38% of osmium, 0.15-0.25% of iridium, and the balance of aluminum and impurities. Through a synergistic effect of all the elements in the wear-resistance aluminum alloy, the wear resistance and the hardness of the aluminum alloy are improved; the hardness of the wear-resistance aluminum alloy is 492-540; and the alkali corrosion resistance of the wear-resistance aluminum alloy is prominently improved.

The invention discloses a wear-resistant alkali corrosion-resistant aluminum alloy which consists of the following components in percentage by weight: 11-13% of silicon, 4-6% of magnesium, 0.1-0.2% of chromium, 0.2-0.4% of titanium, 0.04-0.08% of manganese, 0.1-0.15% of tungsten, 0.1-0.18% of ytterbium, 0.02-0.03% of nickel, 0.5-0.7% of zinc and the balance of aluminum. By adopting the composition, the corrosion resistance and alkali corrosion resistance of a silicon-aluminum alloy can be obviously improved, the corrosion rate is reduced to 0.001-0.0025g / (m<2>.h) from 0.027-0.03g / (m<2>.h) before, and the hardness is improved to about 590 from about 490 before.

The present invention provides a with tertiary air duct curve prefabricated component for a cement kiln, and aims to resolve the problem of poor anti-erosion performance of the tertiary air duct curve of the prior art. The tertiary air duct curve prefabricated component for the cement kiln comprises the following components by weight parts of: 15-25 parts of 5-8mm black corundum, 15-20 parts of 3-5mm black corundum, 10-15 parts of 1-3mm black corundum, 10-15 parts of 0-1mm black corundum, 10-20 parts by 0-1mm of silicon carbide, 6-10 parts of silicon carbide powder not larger than 200 mesh, 5-10 parts of brown alumina powder not larger than 200 mesh, 4-7 parts of calcium aluminate cement, 3-5 parts of alumina powder, 4-6 parts of silica powder, 0.10-0.15 part of a water reducing agent, 0.01-0.02 part of explosion-proof fiber and 0.5-1 part of heat-resistant steel fiber. The invention uses black corundum and silicon carbide as the main materials for the tertiary air duct curve prefabricated component, and the black corundum can make the matrix and aggregate fully connect and cement at high temperature, effectively fill the pores of aggregate and significantly improve the high temperature properties of the material, thereby increasing the abrasion resistance and alkali erosion resistance of the tertiary air duct curve inner liner.

The invention discloses a high temperature resistant material and a preparation method thereof, the material includes the following components by weight: 78-80wt% of Al3O3, 15-19.5wt% of MgO and 7.2-11.5wt% of CaO. The high temperature resistant material is prepared from a raw material of dolomite mineral with wide distribution and low price, and can effectively use the MgO and the CaO components in the dolomite, and the obtained high temperature material has the advantages of light weight, high anti alkali corrosion performance and low cost.

The invention discloses an anti-corrosion aluminum alloy which consists of the following components in percentage by weight: 4-6% of silicon, 3-4% of magnesium, 0.1-0.2% of chromium, 0.2-0.4% of titanium, 0.04-0.08% of manganese, 0.1-0.15% of tungsten, 0.1-0.18% of ytterbium, 0.02-0.03% of nickel, 1.5-1.7% of zinc and the balance of aluminum. According to the anti-corrosion aluminum alloy disclosed by the invention, the corrosion resistance (particularly alkali corrosion resistance) of the aluminum alloy can be obviously improved, and the corrosion rate is reduced to about 0.0005g / (m<2>.h) from 0.032-0.037g / (m<2>.h).

The invention aims to overcome shortcomings in the prior art, and provides a high-temperature-resistance, high-wear-resistance and high-alkali-corrosion-resistance pouring material for a wall of a grate cooler of a middle-sized cement kiln. The other object of the invention is to provide a preparation method of the pouring material. According to the technical scheme, the pouring material is characterized by consisting of the following components in percentages by weight: 15-25% of 85 bauxite, 10-20% of silicon carbide, 23-30% of ferrochrome slag, 5-10% of zinc ferrite, 5-8% of magnesia-zirconia olivine, 1-3% of potassium magnesium titanate powder, 1-2% of trizirconium aluminum nitride, 3-5% of merwinite, 5-10% of alumina micro powder, 2-3% of zirconium calcium aluminate, 3-5% of high-alumina cement, 1% of additional Taiyuan Zihua waste rock, 0.5% of Ti3SiC2, 0.1% of methyl allyl alcohol polyethenoxy ether, 0.05% of isopentenol polyethenoxy ether, 0.1% of aluminium potassium sulfate dodecahydrate, and 0.05% of potassium chromium alum dodecahydrate.

The invention discloses a support device for an early-demolished formwork. The support device comprises a support device body. The support device body comprises a bottom fixed rod. A strut is connected to the top position of the bottom fixed rod. An outer thread is arranged in the position, close to the top, of the surface of the strut and is provided with an adjusting nut in a matched mode. A movable casing is arranged in the position, located at the top of the adjusting nut, of the surface of the strut. Support blocks are arranged on the left and right sides of the movable casing. Extendingblocks are arranged in the positions, close to the outer sides, of the top faces of the support blocks. First extending blocks are arranged in the positions, close to the inner sides, of the top facesof the support blocks. The support device is provided with the adjusting nut matched with the movable casing, thus convenience is provided during both installation and demolition, meanwhile, if one is different from others in height, fine adjustment can be conducted through a connection bolt, and the overall stability is improved through the arrangement of a fixed base. The strut is prepared fromaluminum alloy materials according to a conventional process.

The invention provides a tertiary air duct low-thermal-conductivity and high-wear-resistance brick and a processing technology thereof and relates to the technical field of refractory bricks. The composition comprises the following raw materials in parts by weight: 5-10 parts of high-alumina bauxite clinker with the particle size of 3-5mm, 20-30 parts of high bauxite clinker with the particle sizeof 1-3 mm, 10-20 parts of high-alumina bauxite clinker with the particle size of 0-1 mm, 10-20 parts of high-alumina bauxite clinker in 200 meshes, 5-20 parts of 90# silicon carbide fine powder in 160-200 meshes, 2-5 parts of bentonite, 1-3 parts of feldspar powder in 300-340 meshes and 0.5-2 parts of yellow dextrin. The processing technology comprises the steps of mixing, forming, drying, firingand cooling. The low-heat-conductivity and wear-resistant brick has excellent fire resistance and wear resistance and relatively high strength. The compressive strength is greater than or equal to 80MPa, the T0.6 load softening temperature is greater than or equal to 1580 DEG C, the heat conductivity coefficient is less than or equal to 1.3 W / (m*K) at 1000 DEG C, the alkali resistance is first level, and the wear resistance coefficient is less than or equal to 7.5 cm<3>. The process can effectively prolong the service life of the brick and prevent the top of the integral brick in the tertiary air duct from sinking or collapsing.

The invention provides a wear-resisting-type aluminum-silicon alloy. The wear-resisting-type aluminum-silicon alloy is composed of the following elements of, by mass, 12-15% of silicon, 1-3.5% of copper, 2-4% of magnesium, 0.5-0.7% of zinc, 0.2-1% of boron, 0.1-0.5% of vanadium, 0.4-0.8% of manganese, 0.5-1% of antimony, 0.2-0.38% of osmium, 0.15-0.25% of iridium and the balance aluminum and impurities. All the elements in the wear-resisting-type aluminum-silicon alloy mutually synergistically act, the wear-resisting property and hardness of an aluminum alloy are enhanced, the hardness of thewear-resisting-type aluminum-silicon alloy is 620-670, and the alkali-corrosion-resisting property of the wear-resisting-type aluminum-silicon alloy is also remarkably improved.

The invention is aimed at providing a high-temperature-resistant, high-wear-resistance and high-alkaline-corrosion-resistance castable for a grate cooler wall for overcoming the defects in the prior art, and is also aimed at providing a preparation method of the castable. According to the technical scheme, the castable is characterized by being prepared from, by weight, 15-25 % of tabular corundum, 10-20% of silicon carbide, 23-30% of ferrochrome slag, 5-10% of zinc ferrite, 5-8% of magnesia-zirconia olivine, 1-3% of potassium magnesium titanate powder, 1-2% of trizirconium nitride aluminide, 3-5% of silica powder, 5-10% of alumina micro powder, 2-3% of zirconium calcium aluminate, 3-5% of high-alumina cement, 1% of added Taiyuan purple flower recrement, 0.5% of Ti3SiC2, 0.1% of methallyl alcohol polyoxyethylene ether, 0.05% of isopentenyl alcohol polyoxyethylene ether, 0.1% of aluminium potassium sulfate dodecahydrate and 0.05% of chromium potassium sulfate.

The invention provides an abrasion-resisting aluminum silicon alloy. The abrasion-resisting aluminum silicon alloy comprises the following elements of, by mass, 12%-15% of silicon, 1%-3.5% of copper,2%-4% of magnesium, 0.5%-0.7% of zinc, 0.4%-0.8% of manganese, 0.5%-1% of antimony, 0.2%-0.38% of osmium, 0.15%-0.25% of iridium and the balance aluminum and impurities. According to the abrasion-resisting aluminum silicon alloy, all the elements are synergistic with one another, the abrasion-resisting property and hardness of an aluminum alloy is enhanced, the hardness of the abrasion-resisting aluminum silicon alloy is 610-650, and alkali corrosion resistance of the abrasion-resisting aluminum silicon alloy is also obviously improved.

The invention provides a high-temperature-resistant, highly wear-resistant and highly alkali-corrosion-resistant castable for a rotary kiln grate cooler wall and aims at overcoming the defects of the prior art. The invention also aims at providing a preparation method of the castable. According to the technical scheme, the castable is characterized by being composed of the following components in percentage by weight: 15-25% of sub-white corundum, 10-20% of silicon carbide, 23-30% of ferrochrome slag, 5-10% of zinc ferrite, 5-8% of magnesium-zirconium olivine, 1-3% of potassium magnesium titanate powder, 1-2% of trizirconium aluminide nitride, 3-5% of silica powder, 5-10% of alumina micro powder, 2-3% of calcium aluminate zirconate and 3-5% of high-alumina cement as well as additional 1% of Taiyuan purple flower-like gangue, 0.5% of Ti3SiC2, 0.1% of methylallyl alcohol polyoxyethylene ether, 0.05% of isopentenol polyoxyethylene ether, 0.1% of aluminum potassium sulphate dodecahydrate and 0.05% of chromium potassium sulphate dodecahydrate.

The invention relates to the technical field of castable production, and discloses a special castable with high temperature and alkali corrosion resistance for a smoke chamber of a rotary cement kiln. The invention relates to an explosion-proof spinel brick, which is prepared from the following components in percentage by weight: 30 to 40 percent of spinel micro powder, 10 to 18 percent of aluminate cement, 10 to 15 percent of tabular corundum fine powder, 6 to 18 percent of chromic oxide fine powder, 0.1 to 0.35 percent of polycarboxylate dispersing agent, 1 to 5 percent of zirconium oxide powder, 0.1 to 0.15 percent of water reducing agent, 0.05 to 0.15 percent of organic explosion-proof fiber and the balance of natural mullite with various particle sizes. The raw materials are subjected to grinding, mixing, vibration molding, maintenance and heat treatment to be processed into the castable. According to the invention, the tolerance of the castable to high temperature and alkaline corrosion can be enhanced, the service life of the castable is prolonged, and the use effect is ensured.

The invention discloses a light heat insulating castable for the lower part of a CFB circulating fluidized bed separator and a preparation method thereof. The castable comprises a light framework material, a wear-resistant heat-insulating material, a bonding sizing material, a composite additive and deionized water; the preparation method of the castable comprises the following steps: S1, carrying out coarse crushing, calcination and fine powder treatment on the light framework material to obtain powder; then adding part of deionized water into the powder, and extruding to obtain a light framework material precursor; and finally, drying and baking the light framework material precursor to obtain the light framework material. S2, calcining and crushing the wear-resistant heat insulating material to obtain a heat-treated material; s3, uniformly mixing the heat-treated material with a bonding sizing material, a composite additive and the rest of deionized water to obtain a premix; s4, stirring and fusing the premix and the light framework material obtained in the S1, and obtaining a casting material; the castable prepared by the method has the advantages of light weight, low thermal conductivity and strong wear resistance, and is suitable for large-scale popularization.

The invention aims at providing a castable for an air duct damper. The castable is provided aiming at the defects in the prior art, and is resistant to high temperature, high in wear resistance and high in alkali corrosion resistance. The other objective of the invention is to provide a preparation method of the castable. According to the technical scheme, the castable is prepared from, by weight, 15%-25% of tabular corundum, 10%-20% of silicon carbide, 23%-30% of ferrochromium slag, 5%-10% of zinc ferrite, 5%-8% of magnesia-zirconia olivine, 1%-3% of potassium magnesium titanate, 1%-2% of nitrogen zirconium aluminide, 3%-5% of clinoenstatite, 5%-10% of alumina micro powder, 2%-3% of zirconia calcium aluminate, 3%-5% of high-alumina cement, 1% of additional Taiyuan purple flower rock, 0.5% of Ti3SiC2, 0.1% of VPEG, 0.05% of TPEG, 0.1% of aluminum potassium sulfate dodecahydrate and 0.05% of potassium chromium alum dodecahydrate.

The invention belongs to the technical field of refractory materials, and relates to a lightweight hanging brick for a cement kiln grate cooler and a preparation method of the lightweight hanging brick. The lightweight hanging brick for the cement kiln grate cooler is prepared from 60-70 parts of alumina aggregate, 8-12 parts of alumina fine powder, 4-12 parts of Guangxi white mud fine powder, 1-3 parts of elemental Si powder, 5-10 parts of electrolytic cell side wall aggregate, 4-8 parts of alpha-Al2O3 micro powder and 3-10 parts of organic silicon waste liquid through mixing, ageing, forming, baking and calcining. The lightweight hanging brick prepared by the invention is excellent in thermal shock resistance and alkali corrosion resistance, small in density, low in heat conductivity coefficient, low in cost, simple and convenient in preparation process, capable of greatly prolonging the service life of a refractory material for a grate cooler and enhancing the structural integrity and stability of the part, and good in application prospect.

The invention discloses a wear-resistant aluminum alloy which consists of the following components in percentage by weight: 11-13% of silicon, 4-6% of magnesium, 0.1-0.2% of chromium, 0.2-0.4% of titanium, 0.04-0.08% of manganese, 0.1-0.18% of ytterbium, 0.1-0.15% of tungsten and the balance of aluminum. By adopting the composition, the hardness of the wear-resistant aluminum alloy can be obviously improved by about 30% from about 490 before to about 620, and the alkali corrosion of the obtained alloy is obviously improved.

The invention discloses a preparation method of a high-temperature-resistant brick. The preparation method includes the steps that 1, blending is carried out according to the following formula, wherein 89.1-91.2 wt% of Al3O3, 4.1-5.6 wt% of MgO and 4.5-6.8 wt% of CaO are involved in the formula; 2, the ingredients are mixed and ground; 3, water, adhesive and a pore forming agent are added into the ground ingredients for stirring and mixing; 4, slip casting is carried out; 5, the finished product is obtained after drying and sintering. The obtained high-temperature-resistant material is light in weight, high in alkali erosion resistance and low in cost.