129results about How to "Strong slag resistance" patented technology

The invention relates to a corundum-spinelle lithical concreting material containing nano magnesium carbonate and a preparation method. In the method, the corundum-spinelle lithical concreting material containing nano magnesium carbonate is prepared by taking the currently and commonly used corundum-spinelle lithical concreting material as the base, adding nano magnesium carbonate powder, and adopting high efficient dispersant and proper mixing technique. With the method adopted, not only the adverse impact of magnesium oxide hydration on the concreting material workability caused by adding magnesia to generate spinelle in situ is avoided, but also the dreg resistance and thermal shock resistance of the existing corundum-spinelle lithical concreting material are improved. The corundum-spinelle lithical concreting material containing nano magnesium carbonate prepared by the invention can be widely used in high temperature industries such as steel, nonferrous metal, ceramic, petrochemical and the like, and can also be used for refractory material products such as air bricks which are baked after concreting moulding.

The invention relates to a forsterite-C-containing MgO-SiC-C material refractory and a method for preparing the same. The technical scheme comprises firstly mixing the 25-40wt% of magnesia particles with a grain size of 3-1mm, 20-35wt% of magnesia particles with a grain size of 1-0mm, 5-40wt% of forsterite-C mixed fine powders and 0-35wt% of magnesia fine powders, adding a 4-10wt% of bonding agent accounting for the weight of the mixed material, stirring or mulling for 10-30 minutes, drying after pressing formation, sintering at a reductive atmosphere with a sintering temperature of 1450-1700 DEG C and a heat preservation time of 4-8 hours, getting the MgO-SiC-C material composite refractory. The MgO-SiC-C material refractory prepared by adding the forsterite and carbon not only can solve the problem of magnesia resource shortage, reduces the production cost, but also the SiC prepared by the reaction of magnesia and carbon at a high temperature can reinforce the conjugation inside the material, and be useful for improving the refractory performance. The invention can also adopt low grade magnesia.

The refractory sialon corundum brick material for blast furnace is prepared with corundum grain and powder 60-75 wt%, metal silicon powder 5-12 wt%, metal aluminum powder 10-15 wt%, titania powder 1-8 wt%, alumina powder 3-9 wt%, silica powder 0-2 wt%, clay 0-2 wt% temporary paper pulp or phnolic resin binding agent 2-5 wt%, and through mixing, forming, drying, sintering at nitrogen atmosphere. The refractory sialon corundum brick material has excellent alkali resistance, excellent slag resistance, high heat shock stability, high wear resistance and excellent molten iron fuse loss resistance. The refractory sialon corundum brick material may be used widely for large and medium sized blast furnaces.

The invention relates to MgO-SiC-C refractory material synthesized by forsterite-C and a method. The technical proposal to be adopted is as follows: firstly, forsterite mineral powder and industrial carbon powder are blended according to molar ratio of 1: (1-5); and then the mixture is added with 4 to 10 wt% of bonding agent, stirred or mulled for 10 to 30 minutes, pressed to be formed and dried; and finally under the Ar gas condition, the mixture is sintered in the sintering temperature of 1530 to 1800 DEG C with heat preservation for 2 to 8 hours to obtain MgO-SiC-C refractory material synthesized by forsterite-C. The invention is characterized by comparatively simple processing technique, low producing cost, high producing efficiency, wide raw material source and being capable of reducing energy consumption of high temperature synthesis reaction. The prepared MgO-SiC-C refractory material has the advantages of excellent high temperature performance, anti-corrosion and good durability.

The invention relates to a nano dolomite-containing corundum spinel castable and a preparation method thereof. On the basis of a corundum spinel castable which is commonly used at present, nano dolomite powder is added, spinel and calcium hexa-aluminate serving as seed crystals are introduced, and a high-efficiency dispersing agent and an appropriate mixing process are adopted, so that the nano dolomite-containing corundum spinel castable is prepared. The adverse effect of hydration of magnesia on the construction performance of the castable when spinel is generated in situ by adding the magnesia is avoided, and the slag resistance and thermal shock resistance of the corundum spinel castable which is used at present are improved; and the prepared nano dolomite-containing corundum spinel castable can be widely applied to the field of high-temperature industry such as steel industry, nonferrous metal industry, ceramic industry and petrochemical industry, and also can be applied to a fireproof material product formed by casting, forming and sintering a permeable brick and the like.

The chromium-free refractory material for RH vacuum furnace lining consists of one or several of magnetize, magnesia zirconia and magnesia zirconia silica 88-97 wt%, fine zirconia powder 1-6 wt%, fine zircon powder 0-9 wt%, and organic binding agent 1-3 wt%. It has the chemical composition of MgO 80-90 wt%, SiO2 1-4 wt%, and ZrO2 7-13 wt%. The organic binding agent is binding agent commonly for refractory material, such as sodium humate, calcium lignosulfonate, dextrin and Arabic gum. The MgO-SiO2-ZrO2 chromium-free refractory material has high slagging resistance and is significant for RH vacuum furnace to obtain long service life.

The invention discloses a non-phosphorus and low-carbon alumina-magnesia unburned brick for a stainless steel ladle and a manufacturing method of the brick. The non-phosphorus and low-carbon alumina-magnesia unburned brick comprises the following components by mass percentage: 15-20% of 5-3mm bauxite, 20-25% of 3-1mm bauxite, 10-15% of bauxite less than or equal to 1mm in particle size, 10-15% of 3-1mm fused magnesite, 5-10% of fused magnesite less than or equal to 1mm in particle size, 10-15% of emery powder, 15-20% of spinel powder, 2-5% of aluminum oxide micropowder less than or equal to 25 micrometers, 0.1-2% of silicon carbide additive, 0.1-2% of wetting agent and a phenolic resin binding agent. Compared with the prior art, the brick and the method have the prominent advantages that a burning technology in the conventional method is omitted, energy sources are saved, the brick is free from phosphorus; aluminum and magnesium perform spinel reaction at the high temperature; and the brick is subjected to machine molding in the absence of the phosphorus, has higher density, avoids pollution of molten stainless steel, and has a longer service life.

The invention discloses a blast furnace stemming for repairing and protecting an iron notch, which belongs to the field of refractory materials. According to the invention, the blast furnace stemming comprises the following components in parts by weight: 10-20 parts of corundum, 5-15 parts of homogenizing material, 10-20 parts of coal gangue, 10-25 parts of pyrophyllite, 10-20 parts of composite clay, 10-35 parts of composite powder, 5-20 parts of vanadium-titanium-iron powder, 1-8 parts of silicon nitride iron, 0.1-0.5 parts of wetting agent and 15-22 parts of addition bonding agent, whereinthe composite powder is the mixture of oxide and nonmetal carbide. The blast furnace stemming for repairing and protecting the iron notch, disclosed by the invention, has the advantages of no generation of toxic black smoke, no fractured iron, strong slag resistance, particular suitability for being used in the blast furnace in the later stage and capability of obviously prolonging the service life of the blast furnace; and problems of the traditional stemming, like poor adaptability, large quality fluctuation, short service life, serious pollution and the like, are effectively solved.

The invention relates to a composite long-life low-cost steel ladle air brick base brick. The composite long-life low-cost steel ladle air brick base brick comprises a base brick body, the base brick body comprises an upper body and a lower body which are molded by once casting of different cast materials. The upper body is 260 to 300 mm high, and the inner wall of the upper body is circumferentially provided with grooves uniformly distributed along the height direction. By the composite long-life low-cost steel ladle air brick base brick, cost performance is superior to that of an existing composite air brick base brick, corrosion speed is lower to more than 0.5 mm per furnace year on year, and service life is prolonged by more than ten times.

The invention belongs to the technical field of unshaped refractory materials, and specifically relates to a tundish magnesia coating material prepared by using waste magnesium aluminum spinel as a raw material and a method. The waste magnesium aluminum spinel is obtained in two ways: waste magnesium aluminum spinel bricks or preformed units produced in a production process of a refractory material enterprise are prepared into the waste magnesium aluminum spinel with the particle diameter of 3-0 mm through sorting and crushing; waste magnesium aluminum spinel bricks or preformed units after use by steel mills are prepared into the waste magnesium aluminum spinel with the particle diameter of 3-0 mm through deslagging, sorting and crushing; the waste magnesium aluminum spinels obtained through the two ways are mixed according to the ratio of (1.5:1) to (1:1.5), and then are sieved to obtain waste magnesium aluminum spinel particles of two kinds of particle diameters of 3-1 mm and 1-0 mm; the waste magnesium aluminum spinel particles are taken as a raw material to be added with a binder, a plasticizer, a water reducer, an anti-knock agent, and the like at the same time to develop the tundish coating material which is stable in performance, high in strength, excellent in construction performance and low in cost; the cyclic utilization of waste refractory materials is realized; the enterprise production cost is lowered.

The invention discloses castable for gun patching of a blast furnace lining and a preparation method for the castable. The castable is prepared from raw materials, i.e., 10wt% to 15wt% of bauxite particles, 40wt% to 50wt% of brown fused alumina particles, 10wt% to 20wt% of silicon carbide fine powder, 15wt% to 25wt% of corundum fine powder, 0.5wt% to 2wt% of metal silicon powder, 0.5wt% to 2wt% of pelleted pitch, 2wt% to 7wt% of alpha-Al2O3 micropowder and 0.2wt% to 2wt% of silica micropowder, and silica sol, of which the weight percentage is 8% to 15% that of the raw materials, wherein the silica sol serves as a binder. The method comprises the steps of proportionally preparing the raw materials, adding the raw materials in a stirrer, carrying out uniform stirring and mixing, and then, adding the silica sol as a gun patching wetting medium and the binder, thereby obtaining the castable for gun patching of the blast furnace lining. The castable is superior in slag resistance, high in strength, good in bonding performance and quick in construction and can be integrated with a patched face of the blast furnace lining through binding; and the preparation method is simple in operation, exposed furnace wall linings can be subjected to gun-patching lining forming under the circumstances that a stock level of a blast furnace is lowered, and the blast furnace lining is rapidly patched in a large area.

The invention provides a refractory castable for a molten iron tank. The refractory castable comprises the following components in percentage by weight: 50-65 percent of high-alumina particles, 10-30 parts of high-alumina powder, 1-10 percent of quartz sand, 1-20 percent of diaspore clay fine powder, 3-7 percent of calcium aluminate cement, 1-7 percent of silicon fine powder, 0-4 percent of alumina fine powder, 1-3 percent of zirconium silicate powder, 0.2-2 percent of heat-resistant steel fiber, 0.05-0.3 percent of metal aluminum powder and 0-0.3 percent of sodium tripolyphosphate. The refractory castable for a molten iron tank has the advantages of long service life, high slag resistance and low production cost, is suitable for a molten iron tank for receiving acid slag with high viscosity, is prevented from being eroded, and contributes to reducing adhesive slag.

The invention relates to an anti-slag-adhesion spray coating, which comprises the following raw materials in weight percent: 10%-13% of bauxite granules in grain size of 0-1mm, 20%-24% of bauxite powder in grain size of 325-800 meshes, 13%-18% of silica powder in grain size of 280-325 meshes, 35%-45% of silica powder in grain size of 600-1000 meshes, 1.5%-2.5% of metal silicon powder in grain size of 180-260 meshes, 0.5%-3% of zirconium oxide in grain size of 325-400 meshes, 2%-5% of silicon carbide in grain size of 180-280 meshes, 1.5%-3% of silica powder, 0.2%-0.5% of sodium tripolyphosphate, 0.3%-0.5% of sodium hexametaphosphate and 35%-40% of water. The anti-slag-adhesion spray coating has an excellent anti-slag-adhesion effect, a slag pot and a slag ladle are free from slag adhesion and the service life of the slag pot and the slag ladle is greatly prolonged.

The invention belongs to the technical field of a refractory material, and discloses a method for preparing regenerative magnesia-carbon bricks. The method comprises the following technical flow steps: piling in classification; sorting; removing impurities; preprocessing; pulverizing; dehydrating; screening; packing; and molding the bricks. Regeneration grains can be used for producing regenerated magnesia carbon bricks, aluminum-magnesium-carbon bricks, aluminum carborundum carbon bricks, tundish dry materials, aluminum-magnesium-carbon fireclay and slag-pot unfired bricks. The regeneration use rate of the carbonic crushed bricks can reach as high as 100 percent. The method saves resources, clears garbage and protects the environment.

The invention relates to an infrared temperature measuring pipe for continuously measuring temperature of molten steel and components, and a preparation method thereof. An internal hole of a temperature measuring pipe body is a shoulder hole; a heat conduction block is embedded in a hole with greater diameter at the lower end of the temperature measuring pipe body; a connecting pipe is fixed at the upper end of the temperature measuring pipe body; one part of the connecting pipe is arranged in the temperature measuring pipe body; and the other part of the connecting pipe is arranged outside the temperature measuring pipe. Chrome corundum fireproof casting materials of the pipe body has better thermal shock resistance, excellent slag resistance, stable high-temperature volume and high high-temperature strength; a heat conduction block is made of alumina-carbon and is processed by high temperature, thereby having high thermal conductivity, small thermal capacity and large blackness. Allraw materials used for manufacturing the temperature measuring pipe do not emit smoke gas and volatile during the temperature raising process; therefore, an optical passage of the temperature measuring pipe is always at a clean state, thus thoroughly solving the problem that the optical passage of the existing alumina-carbon based temperature measuring pipe can be polluted by the smoke gas and the volatile easily; and the veracity of the temperature measurement is ensured, and the response speed and the stability are improved.

The invention provides a low-creep andalusite composite refractory brick, which comprises main materials and additives. The main materials include, by weight, 6-12% of large particles of bauxite clinker, 14-27% of large particles of mullite, 14-27% of small particles of andalusite, 14-30% of small particles of mullite, 15-27% of fine powder of andalusite, 5-14% of kaolin micro-powder, 5-10% of mullite micro-powder and 2-5% of silica micro-powder. The mass of the additives is 4.5-5.5% of mass of the main materials. The invention also provides a preparation method and application of the above low-creep andalusite composite refractory brick. The low-creep andalusite composite refractory brick has reasonable combination of ingredients and has good thermal shock property, good thermostability and high refractoriness under load. Therefore, service life of a carbon baking furnace having flue walls lined with the low-creep andalusite composite refractory brick is prolonged.

The invention relates to a furnace bottom ramming material of an RH refining furnace. The furnace bottom ramming material consists of a dry material and an additional anchoring agent, wherein the dry material consists of the following components in percentage by weight: 70-80% of fused magnesite, 5-10% of magnesia-alumina spinel, 1-5% of Al2O3 micro-powder and 1-10% of metal powder, wherein the fused magnesite and the magnesia-alumina spinel are refractory aggregates, the Al2O3 micro-powder and the metal powder are refractory powder, the anchoring agent is an inorganic salt, and the addition amount of the anchoring agent is 1-5% of the weight of the dry material. A preparation method of the furnace bottom ramming material comprises the following steps: preparing various raw materials according to formula requirements, and preparing a dry-powder material in a forced stirring machine; putting the uniformly mixed material into a moisture-proof woven bag; storing and transporting the material at cool and dry places; and when the material is used, adding water and stirring. The furnace bottom magnesia-alumina spinel ramming material of the RH refining furnace, provided by the invention, reaches the same high-temperature performance and the same site construction conditions with a magnesium-chromite ramming material. The furnace bottom ramming material can replace the conventional magnesium-chromite ramming material and has strong environmental-friendliness property.

The invention discloses a yellow sintered landscape brick and a production method thereof. The yellow sintered landscape brick comprises 30 to 50 percent of fire clay and 50 to 70 percent of aggregate, wherein the sum of mass percent of all raw materials is not more than 100 percent. The production method comprises the steps of crushing, screening, blank mixing, blank preparation and roasting. According to the yellow landscape brick, aggregate is adopted as a main material, fire clay is adopted as an auxiliary material, and particularly hard fire clay and/or half-hard fire clay is adopted, so that the plasticity of the aggregate can be realized, and the blank is good in moldability; meanwhile, the raw materials are sintered at a high temperature of a specific range, the fire clay is thermally decomposed and toughened and covers and is bonded to the aggregate to present in faint yellow color and yellow color effects, so that the landscape brick has the characteristics of pure yellow color, relatively high pressure resistance and bending resistance and small deformation. The production method is pure in color, simple in process and stable in product quality.

The invention discloses a method for intensively producing a refractory material through coal tar pitch needle coke. Unutilized QI1 residues of the prior art, coal tar, delayed coking tower side oil products, a modifier and a nickel, vanadium and cobalt removing agent are subjected to separation, sedimentation, purification and oxidization modification to produce a refractory material adhesion agent with high softening point; the refractory material adhesion agent has the performances of high slag resistance, oxidation resistance and thermal shock resistance, is mixed with active agents such as white carbon black, ammonium humate, polyvinyl alcohol, carboxymethyl cellulose and the like and dry pressed to obtain the refractory material for a steel refining furnace, and the refractory material is better than phenolic resin; and the refractory material, carbon black, dimethylbenzene, benzofuran, polyethylene glycol and the like are dissolved, mixed and dissolved so as to obtain a liquid spraying adhesion agent for repairing the steel refining furnace, and the repairing strength of the liquid spraying adhesion agent is better than the repairing strength of common medium temperature pitch. The service lives of equipment such as converters, electric furnaces, calcinators and the like can be prolonged.

The invention provides a low-creep high-rcasting refractory brick. The low-creep high-rcasting refractory brick comprises a main material and an additive, the main material is mainly prepared from, by mass, 20%-40% of flint clay large particles, 20%-35% of flint clay small particles, 15%-25% of flint clay fine powder, 5%-15% of bonding clay fine powder and 5%-15% of bauxite clinker micro powder. The mass of the additive accounts for 4.5%-5.5% that of the main material. The invention further provides a preparation method and application of the low-creep high-rcasting refractory brick. The low-creep high-rcasting refractory brick is reasonable in component matching and has the thermal shock property, good thermal stability and high refractoriness under load, and therefore the service life of a carbon calcinatory with a flame path wall built by the low-creep high-rcasting refractory brick is prolonged.

The invention relates to a MgO-SiC-C fireproof casting material based on forsterite-C and a preparation method thereof. In the technical proposal, forsterite and C powder are mixed according to the mol ratio of (1 to 4) to (3 to 6), and a binder of 1 to 10 percent of the mixture by weight is added. After the mixture is beaten, moulded and dried, the mixture is synthesized into MgO-SiC-C material for two to eight hours at the temperature of 1450 to 1700 DEG C under the reducing atmosphere. 10-25 weight percent of 10-5mm granule, 15-25 percent weight of 5-3mm granule, 15-25 weight percent of 3-1mm granule, 10-20 weight percent of 1-0mm granule, 25-35 weight percent of 0.1-0mm fine powder are mixed with 2-8 weight percent of the binder, and are beaten uniformly, thus getting the MgO-SiC-C fireproof casting material. The manufacturing cost of the invention is low; the process is simple; and the fireproof casting material prepared has good performance, and is widely applied.

The invention relates to a preparation method of a solar heat absorption composite material, belonging to the technical field of solar energy. The preparation method prepares the solar energy heat absorption composite material by adding andalusite, silicon carbide and silicon nitride, wherein the andalusite is an aluminosilicate mineral; after the andalusite is heated to 1350 DEG C under normal pressure, the andalusite begins to be converted into acicular mullite parallel to original crystals; the mullized andalusite is resistant to quenching and shock heating, has large mechanical strength, strong thermal impact resistance, strong slag resistance, high load conversion point, extremely high chemical stability and extremely strong chemical corrosion resistance; silicon carbide bonded silicon nitride has good oxidation resistance. In addition to good wear resistance, the silicon carbide in the material has high thermal conductivity and low thermal expansion coefficient, so that the silicon nitride bonded silicon carbide has excellent thermal shock resistance and acts as an obstacle and delay role in the penetration of external erosion media, and the solar heat absorption composite material has good chemical stability.