35 results about "Silica fume" patented technology

The invention belongs to the technical field of a refractory castable, and particularly relates to a castable for a blast-furnace tapping channel and a preparation method thereof. The castable comprises the following components: 55-80wt% of fused brown corundum, 8-21wt% of silicon carbide, 0.01-5wt% of carbon source, 2-8wt% of alpha-alumina micro powder, 1-7wt% of fused white corundum, 0.5-5wt% of silica powder, 1-5wt% of calcium aluminate cement, 0.3-4wt% of elemental silicon powder, 0.01-0.4wt% of water reducing agent, 0-0.2wt% of organic fibers and 0-0.2wt% of aluminum powder. The preparation method comprises the steps of dry-blending the components for 10-180 seconds, additionally adding water accounting for 4-6wt% of the raw materials, and stirring for 1-8 minutes so as to obtain the castable. Carbon nanotubes are introduced to the castable for the tapping channel so as to partially or totally replace spherical asphalt and be uniformly distributed in the castable, and can be filled into tiny gaps so as to improve the compactness of the castable, so that the anti-erosion and anti-scouring properties of the castable are improved, toxic smog formed in the process of baking the spherical asphalt is reduced, and the body injury of workers and the environmental pollution caused by the toxic smog are reduced; the castable has the characteristics of excellent properties, long service life and environmental friendliness.

The invention belongs to the technical field of building material coating, and particularly relates to a saltpetering-prevention sulphoaluminate cement product and a preparation method thereof. The saltpetering-prevention sulphoaluminate cement product is characterized by being prepared from the following ingredients in parts by weight: 50 to 80 parts of sulphoaluminate cement, 8 to 15 parts of fly ash, 7 to 12 parts of silica fume, 8 to 12 parts of glass fiber, 30 to 90 parts of water, 2 to 5 parts of retarding agents, 3 to 5 parts of water retention agents, 3 to 5 parts of thickening agnets and 5 to 8 parts of saltpetering inhibitors. The saltpetering-prevention sulphoaluminate cement product has the advantages that the formula is reasonable; the use is convenient; the surface of the saltpetering-prevention sulphoaluminate cement product is smooth; anti-seepage performance and water-resistant performance are good; saltpetering cannot occur in the long-time use process.

The invention relates to a high temperature heat treatment furnace, especially relates to a refractory composition for a pure hydrogen atmosphere high temperature furnace. The refractory composition is prepared by letting raw materials be subject to mixing, high-pressure forming and high temperature nitridation sintering, wherein the raw materials comprise 10-30 % of silicon powder, 0.1-5 % of medium-low temperature sintering agent, 1-10 % of binder, and the balance of refractory aggregate. The Si3N4-conjugated silicon carbide refractory material provided by the invention can be used in pure hydrogen atmosphere at the ambient temperature of higher than 1300 DEG C.

The invention provides a foaming-ceramic heat insulating board. The foaming-ceramic heat insulating board is characterized by being prepared from, by weight, 25-30 parts of fusible clay, 6-12 parts of diatomaceous earth, 6-12 parts of alkalifeldspar, 5-10 parts of dolomite, 2-5 parts of starch, 6-12 parts of nano-scale silica fume, 6-12 parts of cement, 6-12 parts of lime, 1-2 parts of anionic surfactant, 0.5-3 parts of foaming agent, 1-4 parts of reinforcing elements, 0.1-0.5 part of triton X-100 and 100-190 parts of water; the reinforcing elements are titanium-system reinforcements or aluminum-system reinforcements or boron-system reinforcements or silicon-system reinforcements. The foaming-ceramic heat insulating board is low in heat conductivity coefficient, high in breaking strength, low in density and not prone to water permeation, and can be widely used for wall materials, heat insulating materials and underground engineering materials. As the triton X-100, the anionic surfactant and the starch are combined to be used, the porosity rate of the board is increased, and bubbles can be more evenly distributed.

The invention discloses a coating material for sealing the coal wall of a gob-side coal roadway. The coating material comprises 100 parts of cement, 3-6 parts of an environmentally-friendly interfacepolymer solid material and 10-15 parts of a mineral mixture and other additives, the environmentally-friendly interface polymer solid material comprises, by mass, 100 parts of an acrylate polymer solid and 8-9 parts of polyethylene synthetic resin, and the mineral mixture and other additives comprise, by mass, 5-10 parts of silica fume, 10-15 parts of common fly ash or slag, 1-2 parts of a superplasticizer and trace parts of basalt chopped fibers. The coating material is a novel composite material for guniting, and meets the requirements for plugging the coal wall of the gob-side coal roadway.

The invention discloses a preparation method of a large-sized compact silicon carbide ceramic plate, and relates to the technical field of reaction sintering silicon carbide ceramics. The preparationmethod comprises the steps of mixing raw materials, carrying out spray granulation, carrying out hot-press forming, humidifying and drying, processing, drying at high temperature and carrying out reactive sintering; a super-conventional silicon carbide ratio is used, humidifying and drying are carried out after the spray granulation and the hot-press forming; during the reactive sintering, siliconpowder is added, and an oxygen-free environment is maintained, wherein the adding amount of the silicon powder is 200-300% of the weight of a blank body, so that the sintered silicon carbide ceramicplate is enabled not to crack and to be compact, uniform in density and high in yield; the preparation method overcomes the technical obstacles in a sintering process of large-sized silicon carbide ceramic plates which have the lengths of 600-800mm, the widths of 400-600mm and the thicknesses of 40-60mm, fills the domestic gap, successfully substitutes for imported goods, and lowers the use cost of the application field.

The invention discloses a method for recycling silicon powder from crystalline silicon cutting waste. The method for recycling the silicon powder from the crystalline silicon cutting waste comprises the following steps: S1, pretreating the crystalline silicon cutting waste to obtain mixed powder of silicon and silicon carbide; S2, adding a solvent into the mixed powder of silicon and silicon carbide, and blending into mixed solution with the pH value of 6-9; S3, putting the mixed solution into a supergravity grading device to be subjected to separation, thus obtaining silicon-enriched phase solution and silicon carbide-enriched sedimentary phase; and S4, regulating the pH value of the silicon-enriched phase solution to be 1-3, filtering, and drying, thus obtaining the silicon powder. According to the method for recycling the silicon powder from the crystalline silicon cutting waste, by virtue of difference of two particles, namely silicon particles and silicon carbide particles, the relationship between surface electric potential and the pH value is combined, most of silica powder in the mixed solution can be in a suspended state by virtue of the supergravity grading device, and silicon carbide particles with relatively large particle size can be rapidly precipitated at a bottom layer, so that separation of silicon carbide and silicon is realized, and the silicon powder can beconveniently recycled.

The invention discloses a method of synthesizing a nano zinc silicate light emitting material by using waste silicon powder by a hydrothermal method. The method comprises the following steps: (1) dissolving Zn(CH3COO)2.2H2O, Mn(NO3)2.4H2O and hexadecyl trimethyl ammonium bromide in deionized water, adding the waste silicon powder, stirring for 15 minutes, adding sodium hydroxide or ammonium water with concentration being 25%, and stirring for 10 minutes to obtain a mixed solution; (2) putting the mixed solution prepared in the step (1) in a reaction kettle with the liner being polytetrafluoroethylene, sealing the reaction kettle, putting the kettle in an oven at 130-200 DEG C to react for 12-48 hours, taking, naturally cooling to room temperature, washing the product by distilled water. carrying out centrifugal separation, and naturally drying to obtain the zinc silicate light emitting material. By using waste silicon powder as a raw material, the method disclosed by the invention expands the range of reactants and can fully utilize industrial leftovers and achieve the purpose of recycling resources. Furthermore, the method disclosed by the invention which is a hydrothermal one-step reaction is simple and feasible and low in energy consumption.

The invention discloses concrete anti-seismic impact-resistant anti-cracking agent. The anti-cracking agent is a mixture of the following materials in parts by weight: 13-17 parts of industrial aluminum sulfate, 2-5 parts of high-strength imitated steel wire fiber, 0.1-0.4 part of lauryl sodium sulfate, 7-13 parts of silica fume, 34.5-45 parts of anhydrite, 23-30 parts of sulfoaluminate clinker and 3-7 parts of active excitant; during a concrete preparation process, the weight of cementing material doped in the concrete is 6%-8%, so that the shrinkage of the concrete is compensated at a plastic stage and each stage after the hardening stage, and therefore, the anti-bending anti-folding capacity of the concrete can be increased, the anti-seismic impact-resistant performances and anti-cracking seepage-proofing performances of the concrete are improved and the durability of the structure is greatly strengthened.

The invention discloses a high-temperature resistant anti-corrosion clay special for an acid pressure oxidative leaching high-pressure autoclave, which is characterized by being prepared from the following raw materials in percentage by weight: 20-40 percent of vinyl epoxy synthetic resin and 60-80 percent of padding, wherein the padding contains the following raw materials in percentage by weight: silica fume, glass flake, titanium dioxide powder, graphite powder, aluminum oxide and barium sulfate. A preparation method of the high-temperature resistant anti-corrosion clay special for the acid pressure oxidative leaching high-pressure autoclave comprises the following concrete process: adding the vinyl epoxy synthetic resin and the padding into a reaction kettle, heating, and stirring andrubbing in vacuum sufficiently until no dry powder or bubbles exist, and finally obtaining the high-temperature resistant anti-corrosion clay special for the acid pressure oxidative leaching high-pressure autoclave. The clay prepared by the invention can meet the requirements of high temperature resistance, anticorrosion, abrasion resistance, low permeability and extremely high heat stability when carrying out direct acid pressure oxidative leaching on zinc sulfide concentrate in the high-pressure autoclave and is simple in process and convenient to manufacture.

The invention relates to a solid waste-based baking-free environment-friendly hollow brick and a preparation method thereof, and belongs to the field of solid waste utilization environmental protection and the field of hollow bricks. Red mud, mineral powder, industrial by-product gypsum, fly ash, silica fume, aluminum ash, carbide slag, wastewater and other solid wastes and waste liquids are usedas main raw materials. The hollow brick comprises the raw materials in parts by mass: 35-50% of red mud, 30-45% of mineral powder, 10-20% of industrial by-product gypsum, 5-15% of a reinforcing agent,0.5-3% of a cementing agent and the balance of sewage or wastewater, wherein the reinforcing agent is prepared by mixing 15-23% of silica fume, 10-25% of aluminum ash, 20-30% of fly ash, 15-30% of carbide slag, 5-10% of zeolite powder and 5-15% of asphalt. Large-scale resource utilization of solid waste is achieved, the occupied area of the solid waste is reduced, environmental pollution is reduced, no natural mineral resources are consumed during preparation, multiple solid waste and waste liquid are used as main raw materials of the baking-free hollow brick, and the product has the advantages of high strength, low cost, environmental protection, energy conservation, simple and convenient process and easiness in popularization and application.

The invention relates to a composite material for a ceramic sealing ring and a preparation method thereof, relates to a composite material and a preparation method thereof, and is used for solving the problems that the traditional ceramic sealing ring does not have the characteristics of corrosion resistance, wear resistance, low friction coefficient and thermal impact resistance. The first scheme is as follows: the composite material is composed of 5-15 parts of graphite, 80-90 parts of silicon carbide and 5 parts of silica fume by volume. The second scheme is as follows: the preparation method comprises the following steps: (1) uniformly mixing graphite powder and silicon carbide powder in a ball milling tank; (2) pressing in a steel mold to obtain powder green compact of the sealing ring, wherein the pressure is 150-200 MPa; (3) infiltrating the powder green compact in molten silicon liquid for 1-3 hours, applying 0.5-10 MPa argon gas pressure on the surface of the molten silicon liquid during the infiltration process, and taking out infiltrated powder green compact; and (4) sintering the powder green compact in a sintering furnace at the temperature of 1700-1800 DEG C for 2-5 hours. The composite material is used for manufacturing the sealing ring.

The invention belongs to the technical field of road sheet material processing, and provides a baking-free pavior brick and a preparation method thereof. The baking-free pavior brick comprises the following components: 10-15 parts of fly ash, 30-47 parts of waste potter's clay, 6.5-9.2 parts of silicon powder, 2-6 parts of sodium meta aluminate, 4-9 parts of air floatation algae slag, 0.03-2.7 parts of a binder, and 0.02-0.18 parts of a gallant. The pavior brick is produced by preparing a blank material, moulding a base substrate and preparing the product. The method adjusts a formula of the pavior brick, fly ash, waste potter's clay, zinc powder, sodium meta aluminate, the air floatation algae slag, the binder and the gellant are combined for substituting the cement, and the prepared pavior brick has strong frost resistance and intensity. The production method has convenient operation, the compressive strength of the produced pavior brick can reach as high as 35 MPa, the frost resistance is strong, the waste materials can be used with a maximum degree, the roasting is not required, the energy is saved, the air pollution is reduced, and the method is worth of popularization.

The invention relates to the field of building materials, and particularly discloses a shield grouting material and a preparation method thereof. The shield grouting material is prepared from the following raw materials in parts by weight: 80 to 120 parts of cement, 180 to 300 parts of fly ash, 200 to 350 parts of sand, 50 to 80 parts of bentonite, 2 to 4 parts of a thickening agent, 0.5 to 1.5 parts of an expanding agent and 0.5 to 3 parts of a water reducing agent, the thickening agent is prepared from silica fume, hydroxypropyl methyl cellulose and diallyl phthalate; the shield grouting material prepared by the invention has a relatively high condensation speed.

The invention relates to a method for preparing silicon alloys by using waste silicon mud, comprising the following steps: a. melting the mixture of silicon carbide and silicon powder after preliminary separation of waste silicon mud at high temperature, pouring the molten silicon metal liquid in the upper layer into the preheated b. Put part of the silicon back into the furnace, raise the temperature of the furnace to 1550°C, add iron powder while stirring, wait for the iron powder to melt, add covering agent, and keep warm for later use; c. Pour the remaining silicon into the furnace , the furnace temperature rises to 850°C, add aluminum powder, add covering agent, and keep warm for later use; d. Add manganese elemental metal, ferrosilicon alloy, and copper elemental metal in batches, heat up, and turn on the ultrasonic device for reaction at the same time; e. Put the molten metal in Into the mold extrusion molding. The silicon alloy prepared by the method has the characteristics of low density, high thermal conductivity, good electrical conductivity, high hardness, excellent thermomechanical stability, high compactness, etc., the whole production process realizes zero emission, and solves the outstanding environmental protection problems in this field.

The invention belongs to the technical field of silicon tube sputtering target materials, and particularly relates to a preparation method of a silicon tube sputtering target material. The silicon tube sputtering target material comprises metallic silicon and a metal element additive, wherein the mass parts of the components are as follows: 96-98 parts of metallic silicon, and 2-4 parts of metal element additive. The preparation method further comprises the following steps of: S1, cleaning the metallic silicon by using ultrasonic equipment, and ball-milling the metallic silicon twice to obtainsilicon powder; S2, uniformly mixing the metallic silicon and the metal element additive by using a mixing device to obtain mixed powder; and S3, filling the mixed powder into a tubular cavity of a cold isostatic pressing mold, pressing the silicon powder into a tubular shape through a three-time static pressure process, then removing the cold isostatic pressing mold to obtain a silicon tube blank, and trimming the end head and the outer surface of the silicon tube blank. The silicon tube sputtering target material is scientific and reasonable in structural design, has more excellent specificresistance, stress and corrosion resistance to a base material, and is more reliable in use.

The invention belongs to the field of application of high-performance building materials and solid wastes in high-performance concrete, and particularly relates to low-volume-weight iron tailing powder reactive powder concrete and a preparation method thereof. The low-volume-weight iron tailing powder reactive powder concrete is prepared from the following raw materials in parts by weight: 200 to 220 parts of cement, 50 to 60 parts of silica fume, 112 to 126 parts of quartz sand coarse sand, 66 to 74 parts of quartz sand medium sand, 36 to 40 parts of quartz sand fine sand, 70 to 76 parts of iron tailing powder, 36 to 44 parts of water, 32 to 38 parts of steel fiber and 2 to 4 parts of a water reducing agent. The cost of the reactive powder concrete can be reduced, the problem that a large number of iron tailings are piled up can be solved, in addition, the compressive strength and breaking strength of the reactive powder concrete are improved through replacement of the iron tailings, and the volume weight of the reactive powder concrete is reduced. The iron tailing powder reactive powder concrete disclosed by the invention is considerable in compressive strength and breaking strength, relatively simple in preparation process and low in volume weight, and can be applied to anti-collision walls, sidewalks and cable cover plates.

The invention provides fiber-reinforced high-strength foam concrete. The fiber-reinforced high-strength foam concrete comprises the following raw materials in parts by weight: 50-100 parts of ordinary Portland cement, 5-20 parts of silica fume, 10-30 parts of mineral powder, 5-10 parts of stainless steel slag powder, 50-70 parts of quartz sand, 1-5 parts of polypropylene fibers, 1-2 parts of a composite admixture, 2-5 parts of a foaming agent and 23-50 parts of water. The concrete provided by the invention improves the strength of the whole concrete system while reducing the volume weight, and can be applied to load-bearing members.

The application discloses a manufacturing method of high-performance marine concrete. The method comprises the following steps: Step 1, weighing the following raw materials (by weight): 35-50 parts of cement, 9-15 parts of medium-coarse sand, 10-11 parts of crushed stone, 20-26 parts of blast furnace slag, 13-19 parts of coal ash, 2-5 parts of silica fume, 1.5-3 parts of a rebar corrosion inhibitor and 0.5-2 parts of a water reducing agent; Step 2, taking out medium-coarse sand and washing off dirt on the surface, taking out cleaned medium-coarse sand and airing to remove moisture; Step 3, taking all cement, putting cement into an agitator and stirring; Step 4, continuously adding crushed stone, blast furnace slag, coal ash and silica fume into the agitator, and uniformly stirring the mixture; Step 5, continuously adding the rebar corrosion inhibitor into the agitator, and adding a few amount of water; and Step 6, continuously adding the water reducing agent into the agitator, and stirring for 1 min so as to prepare the high-performance marine concrete. The concrete has low apparent density, strong corrosion resistance and good stability. By the use of lots of medium-coarse sand and crushed stone, apparent density of the concrete product is reduced. The product is applicable to severe environments such as a maritime environment.

The invention relates to ultra-high performance concrete containing metakaolin and a preparation method of the ultra-high performance concrete. The concrete comprises the following components in parts by mass: 750-800 parts of cement, 40-50 parts of silica fume, 450-480 parts of metakaolin powder, 1800-2000 parts of machine-made sand, 25-35 parts of a water reducing agent and 195-205 parts of water, wherein the specific surface area of metakaolin is not less than 800m < 2 >/kg, the ignition loss is not more than 2.5%, the 28d activity index is not less than 115%, and the concrete is obtained by stirring and mixing the raw materials according to the mass parts. Compared with the prior art, the flowability and strength of the freshly mixed concrete are obviously improved, and the durability of the concrete is obviously improved.

The invention relates to the technical field of concrete, in particular to concrete, which is prepared from the following raw materials: a geopolymer, an activating solution, artificial bones, eggshells, sea sand, silicon powder, graphene powder, fly ash, a concrete reinforcing agent and water. The geopolymer is prepared by the following method of: selecting metakaolin as a raw material, performing heating to 500-600DEG C in a closed container, and then performing natural cooling; and grinding and crushing the cooled metakaolin into powder, and taking the heat treatment products with particlesizes of 0.3-3mm and 5-8mm. The concrete is reasonable in formula, the geopolymer is adopted to effectively replace cement, and the whole concrete production cost is reduced, so that the whole building cost is reduced, the economic benefit is improved, and wide popularization and application are facilitated.

The invention discloses a light-weight medium-high pressure mold and a preparation method thereof. The light-weight medium-high pressure mold comprises the following raw materials by weight: cement, wherein the cement is P.O42.5 and above ordinary Portland cement; ceramsite, wherein the density grade of the ceramsite is greater than or equal to 700, and the particle diameter is 8-12 mm; sand, wherein the sand is medium-coarse sand, and the modulus of the sand is 2.4-3.3#; a water reducing agent, wherein the water reducing agent is a polyhydroxy acid high-efficiency water reducing agent, and the mixing amount is 0.5-1%; and silica fume powder, wherein the particle size of the silica fume powder is less than 5 [mu]m, the water/binder ratio is 0.3-0.35, the ratio of the cement to the silica fume to the ceramsite to the sand is 48-52:1.5-3.5:16-20:55-60, the compressive strength of the mold is 40-45 Mpa, and the density of the mold is 1500-1600 kg/m<3>. On the premise that the compressivestrength is kept, the weight of the mold can be reduced by about 30%.

The invention discloses a ceramic steel material. The ceramic steel material is characterized by comprising the following raw materials in parts by weight: 80-100 parts of kaolin, 25-30 parts of ironoxide, 2-3 parts of copper oxide, 10-15 parts of aluminum oxide, 10-12 parts of nano iron powder, 20-30 parts of nano zinc oxide, 22-30 parts of quartz sand, 2-5 parts of anorthite, 10-15 parts of talc powder, 12-15 parts of mica powder, 3-5 parts of zircon, 5-10 parts of silicon dioxide, 1-2 parts of silica fume, 3-5 parts of titanium dioxide, 2.5-4 parts of steel fibers, 5-7 parts of ceramic fibers and 3-5 parts of barium sulfate. According to the ceramic steel material provided by the invention, adopted components are reasonably blended with each other, and the prepared ceramic steel material has the advantages of excellent performance, good stability, high-temperature resistance, corrosion resistance, good waterproof property, high strength and the like, and can be applied to various fields.

The invention discloses a preparation method of a water-resistant gypsum emulsion. The preparation method comprises the following steps: step 1, mixing gypsum, silica fume, borax, activated carbon, cement and a stearic acid emulsion, and conducting stirring and mixing for 1-3 h to obtain an emulsion system A; step 2, adding aluminum oxide and hydroxypropyl methyl cellulose into the emulsion system A obtained in the step 1 under a stirring condition at 60-80 DEG C, and continuing stirring after the aluminum oxide and the hydroxypropyl methyl cellulose are added so as to obtain an emulsion system B; step 3, adding polyacrylamide into the emulsion system B obtained in the step 2 under a stirring condition at 85-95 DEG C, continuing stirring after the polyacrylamide is added, and performing natural cooling to room temperature; and step 4, centrifugally separating the system after cooling in the step 3 to obtain the water-resistant gypsum emulsion. The gypsum emulsion prepared by the method disclosed by the invention has stable and long-lasting water resistance, can be applied to the building industry, is simple in components and low in cost, and can effectively save raw materials and protect the environment.

The invention discloses a fireproof core plate and a production method thereof; the fireproof core plate is produced from, by weight, 50-60 parts of deionized water, 30-40 parts of magnesium chloride, 5-15 parts of magnesium chloride, 0.5-1 part of polyacrylonitrile-based carbon fiber, 0.5-1 part of polypropylene fiber 10-15 parts of calcium carbonate, 1-2 parts of a modifier, 5-10 parts of silica fume, 10-20 parts of a plant foaming agent, 5-10 parts of sodium carboxymethyl cellulose, and 1-2 parts of phosphoric acid. Various flame retardants are reasonably used so that fireproof capacity of a door core is improved; the production steps and related conditions are reasonably arranged, and therefore the production process is saved and compatibility of related flame retardants is improved.