38 results about "Chromium sesquioxide" patented technology

The invention relates to a preparation method of coarse-grained chromium carbide powder. The preparation method comprises the following steps: firstly, carrying out preliminary stirring, ball milling, pre-drying, low-temperature drying and medium-temperature pyrolysis on chromium sesquioxide powder, a dispersing agent and glycerol, so that the glycerol is pyrolyzed into solid carbon, and coating the surface of chromium sesquioxide with the solid carbon to form first-stage carbon source coated powder; mixing the powder with graphite powder and glycerol, carrying out pre-drying and low-temperature drying and shaping to obtain a two-stage carbonization column, carrying out gradient heating carbonization under a protective atmosphere to enable chromium sesquioxide and carbon to fully react to generate a chromium carbide phase mainly comprising Cr3C2, and then carrying out post-treatment to obtain the coarse-grained chromium carbide powder. According to the invention, glycerol is introduced as a main carbon source in the early stage and microcosmic coating is realized, so that the contact between the carbon source and chromium sesquioxide is more sufficient, and the reaction efficiency is improved; and meanwhile, the graphite powder is subjected to independent ball milling in advance to control the granularity, so that carbon source demolding is avoided, and better granularity control is realized. The method is flexible in process, and the product is coarse, uniform and stable in granularity.

The invention belongs to the technical field of target material production, and discloses a ZMO target material which is prepared from zinc oxide, magnesium oxide and doped metal oxide. Wherein the doped metal oxide is selected from at least one of tantalum pentoxide, cerium dioxide, titanium dioxide, niobium pentoxide, manganese sesquioxide and chromium sesquioxide, the mass ratio of metal elements in zinc oxide to metal elements in magnesium oxide is (73-91): (9-27), and meanwhile, the metal elements in the doped metal oxide account for 1000-10000 ppm of the total mass of the metal elements in the target material. Through the design, on one hand, the relative density of the target material is improved, and on the other hand, higher carrier concentration or more excellent carrier migration capability is provided for the target material by doping the metal oxide, so that the resistivity of the target material is reduced; in addition, the invention also discloses a preparation method of the ZMO target material.

The invention provides near-infrared adjustable double-perovskite type mechanoluminescence fluorescent powder as well as a preparation method and application of the near-infrared adjustable double-perovskite type mechanoluminescence fluorescent powder. The expression general formula of the double perovskite type mechanoluminescence fluorescent powder is Sr2M1-xSbO6: xCr < 3 + >, wherein M is Al, Ga, Sc, In or Y; x is equal to 1%-7%. The preparation process of the fluorescent powder comprises the following steps: a, weighing strontium carbonate, an oxide of M, antimony pentoxide and chromium sesquioxide according to the element proportion in the chemical general formula Sr2M1-xSbO6: xCr < 3 + >; b, mixing the weighed raw materials, and uniformly grinding to obtain a mixture; and c, carrying out high-temperature calcination on the obtained mixture to obtain the near-infrared adjustable double perovskite type mechanoluminescence fluorescent powder. By regulating and controlling the components of the substrate, the emission main peak can be adjusted from 780nm to 946nm. The fluorescent powder provided by the invention can show a self-recovery near-infrared stress luminescence characteristic without pre-irradiation under continuous stress stimulation, is simple to prepare and convenient for industrial batch production, and has a wide application prospect.

The invention discloses a method for preparing high-purity chromium metal through carbon reduction, which comprises the following steps: proportioning chromic oxide, carbon powder, starch and water according to a certain proportion, and carrying out primary compaction to obtain a wet blank; adding the wet blank into an electric arc furnace, and smelting and melting to obtain bulk carbon chromium; after being manually and coarsely crushed, the molten and cooled large carbon chromium blocks are sequentially fed into a jaw crusher and a column mill to be crushed; adding chromic oxide, starch and water into the crushed carbon chromium, mixing, and carrying out secondary compaction to obtain a briquette-like material; feeding the coal-like spherical material into a drying box, gradually heating, fully drying a green body, and then cooling; and after drying, loading the blank into a vacuum reduction furnace layer by layer, and carrying out vacuum reduction on chromium sesquioxide and carbon chromium in a four-side heating manner to obtain the high-purity metal chromium. According to the method, preparation of high-purity metal chromium is achieved, and the conversion rate of preparing metal lattice powder from chromium oxide can be greatly increased; and the content of impurities in the metal chromium is reduced.

The invention relates to a method for preparing vanadium, chromium, aluminum and silicon products through gradient separation of vanadium shale. According to the technical scheme, silicon in the vanadium shale alkaline leaching solution is removed through a sulfuric acid precipitation method, and a desilicication solution and a siliceous precursor I are obtained; washing the siliceous precursor I with sulfuric acid, washing with water and calcining to obtain white carbon black; carrying out vanadium-chromium co-extraction on the desilicication liquid by adopting an amine extraction agent to obtain a vanadium-chromium organic phase; carrying out vanadium-aluminum extraction separation on the washing liquid by adopting an amine extraction agent to obtain a vanadium-rich organic phase and an aluminum-containing raffinate; the vanadium-rich organic phase and the vanadium-chromium organic phase are mixed, vanadium-chromium separation is achieved through step-by-step reverse extraction, and vanadium-rich liquid and chromium-rich liquid are obtained; adjusting the pH value of the aluminum-containing raffinate to precipitate aluminum hydroxide, and calcining to obtain aluminum oxide; carrying out ammonium salt vanadium precipitation on the vanadium-rich liquid to obtain ammonium polyvanadate, and calcining to obtain vanadium pentoxide; and reducing the chromium-rich liquid, adjusting the pH value, precipitating chromium hydroxide, and calcining to obtain chromium sesquioxide. The method is high in leaching rate, small in slag amount, high in product purity and high in recovery rate.

The invention discloses a low-toxicity cuprous oxide semiconductor coating material and a preparation method thereof, and in the composition of raw materials for preparing the low-toxicity cuprous oxide semiconductor coating material, copper oxide powder CuO and copper powder Cu are used as main components; at least two metal oxides are used as additives and at least comprise Cr2O3 and Fe2O3; kaolin, feldspar powder and quartz sand are used as mineralizing agents, and deionized water is used as a solvent; the raw materials comprise the following components in percentage by mass: 35-45% of copper oxide powder CuO; 8 to 12 percent of copper powder Cu; 7 to 9 percent of ferric oxide (Fe2O3); 7 to 9 percent of chromium sesquioxide (Cr2O3); 5% to 8% of feldspar powder 3Al2O3. 2SiO2-Al2O3; 18 to 22 percent of quartz sand SiO2; 5 to 7 percent of kaolin; the sum of the mass proportions of the components is 100%. According to the technical scheme, the problem that the existing semiconductor coating material taking Cu2O as a main material does not have the capability of adopting spraying processing due to the fact that Cu2O has high toxicity is solved.

The invention relates to the field of refractory materials, in particular to a high-erosion-resistance refractory material based on boron nitride modification and a preparation method of the high-erosion-resistance refractory material. The problem that an existing refractory material is poor in erosion resistance is solved. The refractory material is prepared by taking zirconium dioxide, silicon dioxide, calcium oxide, ferric oxide and aluminum oxide as matrixes and adding samarium lanthanum magnesium aluminum composite gel powder and boron nitride loaded chromium sesquioxide, magnesium nitrate, aluminum nitrate, samarium nitrate, lanthanum nitrate and citric acid form gel, high-temperature treatment is performed to obtain the samarium lanthanum magnesium aluminum composite gel powder, and the samarium lanthanum magnesium aluminum composite gel powder is added to the boron nitride loaded chromium sesquioxide. Boron nitride is loaded with chromium sesquioxide after being treated by tannic acid, the corrosion resistance of the material is enhanced through the synergistic effect of all the components, and the material is suitable for high-temperature furnaces, high-temperature reactors and other industrial environments needing high-temperature resistance and high corrosion resistance.

The invention discloses a petuntse composition, ceramic and application, and relates to the technical field of ceramic. The ceramic disclosed by the invention is obtained by sequentially carrying out ageing treatment, sieving treatment, injection molding, airing, drying and sintering treatment on a petuntse composition. The petuntse composition comprises a ceramic waste material A, a ceramic waste material B and modified particles with gallium-coated cuprous oxide as a core and aluminum oxide as a shell in a specific proportion. And the components such as a high-entropy oxide solid solution generated by the reaction of hafnium oxide, tantalum pentoxide, niobium pentoxide, titanium dioxide, zirconium dioxide, chromium sesquioxide and carbon powder, and chromium heptacarbide are introduced, so that the ceramic prepared from the ceramic waste has excellent fracture toughness, bending strength, wear resistance, high temperature resistance and self-repairing ability. Therefore, the method has a wide application prospect.

The invention discloses a nano coating with high radiation heat exchange capacity and a preparation method of the nano coating, and belongs to the technical field of nano coatings. Comprising 10 to 15 parts of cordierite micro powder, 4 to 8 parts of ferric oxide, 5 to 10 parts of silicon carbide, 5 to 10 parts of chromium sesquioxide, 3 to 8 parts of titanium dioxide, 5 to 10 parts of aluminum oxide, 1 to 5 parts of nickel oxide, 8 to 12 parts of self-made modified silicon dioxide mixed suspension, 18 to 28 parts of a composite binder, 0.4 to 1.2 parts of a dispersant, 0.1 to 0.2 part of an antifoaming agent, 0.3 to 0.5 part of a leveling agent and 12 to 22 parts of deionized water. According to the technical scheme, the self-made modified silicon dioxide mixed suspension is introduced into the nano coating, and an imidazole rigid group with relatively large steric hindrance is introduced into the modified silicon dioxide, so that the movement capability of each chain segment in the coating in a high-temperature environment can be reduced, and the temperature resistance of the coating is further improved.

The invention relates to the field of fused zirconia corundum bricks, and discloses a production method for regulating and controlling internal stress of fused zirconia corundum bricks, which comprises the following steps: preparing raw materials; melting in an electric furnace: putting the prepared raw materials into the electric furnace for melting; ventilating in stages in the melting process; preparing a mold for casting; after casting is completed, demolding and annealing are conducted; the raw materials comprise the following components in parts by weight: 50-65 parts of aluminum oxide; 25 to 35 parts of zirconium oxide; 8 to 12 parts of silicon dioxide; 0.5 to 2 parts of chromium sesquioxide; 0.5 to 1.5 parts of magnesium oxide; and 3-5 parts of scandium oxide. By adding scandium oxide and utilizing the characteristic that scandium oxide stabilizes a tetragonal phase, high-temperature phase change of zirconium oxide is effectively inhibited, and stress is reduced. Meanwhile, scandium oxide is used for refining grains, enhancing the grain boundary strength and reducing high-temperature stress concentration, so that the high-temperature stability of the fused zirconia corundum brick is improved, brittle fracture is avoided, and the thermal stability and durability are enhanced.

The invention belongs to the technical field of solid waste recycling and wastewater treatment, and particularly relates to a method for treating chromium-containing wastewater by adopting organic amine flue gas desulfurization residues. According to the method, the organic amine flue gas desulfurization slag is adopted as a reducing agent, hexavalent chromium is reduced into trivalent chromium, the trivalent chromium is separated from water in a precipitate form, and the precipitate is roasted to obtain chromium sesquioxide powder with relatively high purity in supernate; hexavalent chromium and total chromium can reach the national standard. According to the method, the treatment cost of the hexavalent chromium wastewater and the flue gas desulfurization slag is remarkably reduced, and meanwhile, the resource utilization of the flue gas desulfurization waste in a waste-to-waste manner is also realized.

The invention belongs to the technical field of plastic waste treatment, and particularly relates to a degradation and recovery method of a polyester material. The degradation and recovery method of the polyester material provided by the invention comprises the following steps: mixing the polyester material, a catalyst and a hydrogen donor, and then carrying out ball milling to obtain dimethyl terephthalate; the catalyst comprises copper chromite or chromium sesquioxide; the hydrogen supply reagent is methanol. According to the invention, copper chromite or chromium sesquioxide is taken as a catalyst, methanol is taken as a hydrogen donor, molecular chains can be activated, molecular chain breakage and strong mixing of reactants can be promoted under the action of mechanical force of ball milling, and the activation energy of reaction can be reduced due to good catalytic performance of the catalyst, so that efficient degradation of the polyester material under mild conditions is promoted. The degradation and recovery method provided by the invention does not need additional heating, is simple in process and low in energy consumption, can highly selectively degrade the polyester material into dimethyl terephthalate, and has remarkable high efficiency and economical efficiency.

The invention relates to the technical field of hydrometallurgy, in particular to a vanadium and chromium separation method for a vanadium and chromium solution. The method comprises the following steps: adjusting the pH value of the vanadium-chromium solution to 2-4; adding a reducing agent into the vanadium-chromium solution; adding tetraalkylammonium into the obtained solution, stirring, and filtering to obtain a vanadium-containing precipitate and a chromium-containing solution; washing, drying and calcining the vanadium-containing precipitate to obtain vanadium pentoxide; adding alkali into the chromium-containing solution, stirring, filtering to obtain chromium hydroxide precipitate, washing, drying and calcining the chromium hydroxide precipitate to obtain chromium sesquioxide. According to the method, Cr (VI) is selectively reduced into Cr (III) through a reducing agent, vanadium in the solution exists in the form of polyvanadate anions and chromium exists in the form of Cr < 3 + >, then tetraalkylammonium is selected for vanadium precipitation, the radius of tetraalkylammonium ions is larger than that of NH4 < + > in a traditional vanadium precipitation agent, the tetraalkylammonium ions can be combined with the polyvanadate anions more easily to repel Cr < 3 + >, and therefore the vanadium precipitation effect is improved. Therefore, the separation of vanadium and chromium is simply, conveniently and efficiently completed.

The invention discloses a preparation method of a double perovskite oxide Sr2CrReO6 with high purity. According to the method, strontium carbonate and rhenium heptoxide are taken as raw materials and are subjected to high-temperature reaction under the protection of argon to synthesize an intermediate product; then mixing with chromium sesquioxide and elemental chromium powder, and carrying out high-temperature reaction under a vacuum tube sealing condition to obtain a crude product; and finally, carrying out heat treatment for multiple times in an inert atmosphere, and removing an impurity phase to obtain high-purity Sr2CrReO6 powder. By optimizing the temperature and time of the high-temperature reaction and introducing the heat treatment step, the impurity content is remarkably reduced, and the product purity is improved. According to the compact ceramic prepared from the high-purity powder through a spark plasma sintering technology, the antisite defect is 13.5%, the Curie temperature reaches 610 K, and the saturation magnetization is 0.84 microB / f.u. The method is easy and convenient to operate, low in equipment requirement, high in safety and suitable for laboratory-scale high-quality material preparation.

The utility model discloses roasting equipment for producing chromium sesquioxide from chromium-containing waste, which comprises a support frame, a plurality of support legs arranged at the bottom end of the support frame, a chimney arranged in the middle of the support frame, a roasting furnace arranged at the bottom end of the chimney, a material conveying pipe arranged on one side of the roasting furnace, and a feeding hopper arranged at the other end of the material conveying pipe. A bin door is arranged at one end of the roasting furnace, an observation window is arranged in the middle of the bin door, an ignition gun is arranged on the other side of the roasting furnace, an exhaust port is formed in the top end of the chimney, and a filtering device is arranged at the top end of the exhaust port. An air inlet is formed in one side of the air chamber, a slag discharging opening is formed in the middle of the bottom end of the air chamber, a partition plate is arranged at the top end of the air chamber, and a plurality of filtering holes are formed in the surface of the partition plate. Through the arrangement of the air chamber, the air chamber is fixedly connected to the bottom end of the roasting furnace during use, and then sufficient oxygen is provided for the roasting furnace through the air inlet, so that substances in the roasting furnace are combusted more sufficiently, and the production rate of chromic oxide is further increased.

The invention relates to the field of electronic materials, and particularly discloses a low-gradient zinc oxide varistor and a preparation method thereof. The invention relates to a low-gradient zinc oxide piezoresistor disc, which is prepared from the following raw materials in parts by weight: 88 to 96 parts of zinc oxide, 1.5 to 3 parts of antimony trioxide, 2 to 5 parts of bismuth trioxide, 0.2 to 1.8 parts of nickel oxide, 0.1 to 0.9 part of cobalt sesquioxide, 0.1 to 0.4 part of manganese oxide, 0.02 to 0.07 part of chromium sesquioxide, 0.15 to 0.18 part of lithium acetate, 1.2 to 1.8 parts of dispersing agents, 1.8 to 2.5 parts of binding agents, 0.12 to 0.15 part of aluminum nitrate and 0.001 to 0.003 part of silver nitrate. Under the synergistic effect of all the components, by adjusting the use ratio of all the components, the potential gradient of the resistor disc can be reduced, the large-current endurance capacity of the resistor disc is improved, and the change of electrical performance after impact is reduced.

The invention discloses a method for preparing a sodium sulfate solution and chromic oxide of different grades from chromium-containing sodium hydrogen sulfate, which comprises the following steps: calcining the chromium-containing sodium hydrogen sulfate at high temperature to obtain a solid product and a gas product; putting the solid product into a pulping tank, adding water, pulping and dissolving until the solid product is completely dispersed, preparing a feed liquid, and carrying out filter pressing to obtain a primary filter-pressed filter cake and an acidic solution; adding alkali into the acidic solution for neutralization, preserving heat and curing, and then carrying out filter pressing to obtain a secondary filter-pressed filter cake and a slightly acidic solution; washing and filter-pressing the primary filter-pressed filter cake, and calcining to obtain low-grade chromium sesquioxide; and washing the secondary filter-pressed filter cake, carrying out filter pressing, and calcining to obtain the high-grade chromium sesquioxide. The invention provides the method for efficiently recycling the by-product chromium-containing sodium hydrogen sulfate in the production process of chromic anhydride, the problem of poison of wastes is solved, the process is simple and easy to operate, environmental protection benefits and economic benefits are considered, and the method is suitable for industrial production.

The invention belongs to the technical field of welding materials and laser welding processes, particularly discloses a SiC / Al-based composite material laser welding method based on active agent micro-filling and preset titanium foil assistance, and further provides a welding active agent which comprises the following components in percentage by mass: 1%-10% of titanium dioxide, 1%-10% of aluminum oxide, 1%-10% of aluminum oxide, 1%-10% of aluminum oxide and the balance of aluminum oxide. 5%-15% of cerium oxide; 26%-36% of sodium hexafluoroaluminate; 16%-26% of chromium sesquioxide; and 23%-55% of spherical silicon powder. And a better welding effect can be obtained when the welding rod is matched with a micro-filling material titanium foil for use. According to the method, the aluminum-based composite material and the base material are preset at the weld joint, the weldability of the aluminum-based composite material can be effectively improved, the required laser heat input is reduced, the tensile strength of the obtained joint reaches 54.4% of that of the base material, the process steps are simplified, the requirements for equipment and base material pretreatment are reduced, and the method has remarkable industrial application value.

The invention provides high-temperature reduction flame iron body porcelain and a preparation method thereof, and the iron body porcelain is prepared from the following chemical components in percentage by mass: 66.8 to 72.6 percent of silicon dioxide, 15.5 to 21.7 percent of aluminum oxide, 1.77 to 7.82 percent of total iron, 1.04 to 2.59 percent of magnesium oxide, 0.04 to 1.67 percent of calcium oxide, 0.06 to 0.1 percent of sodium oxide, 1.28 to 3.58 percent of potassium oxide, 0.1 to 0.85 percent of titanium dioxide, 0.02 to 0.03 percent of manganese oxide, 0.02 to 0.15 percent of scale pentoxide and barium oxide. 0.02% of chromium sesquioxide, and 1t of chromium sesquioxide; 0.006%, the content of nickel is 1t; the aluminum alloy comprises the following components in percentage by weight: 0.002% of aluminum, 0.002%-0.003% of copper, 0.006%-0.008% of strontium and 0.02% of zirconium, and the ignition loss is 4.05%-8.42%. According to the high-temperature reduction flame iron body porcelain and the preparation method thereof, the chemical composition is accurately controlled, so that the high-temperature reduction flame iron body porcelain has good physical and chemical properties, and meanwhile, a porcelain body is endowed with relatively high hardness and heat resistance; due to the proper iron content, the porcelain body has unique color and luster, the strength of the porcelain body is enhanced, and the problems of cracking, deformation and the like are effectively reduced.

The invention discloses an Nb-Cr-Al ternary intermediate alloy and a preparation and application method thereof. The Nb-Cr-Al ternary intermediate alloy is prepared by taking aluminum as a reducing agent, niobium pentoxide and chromium sesquioxide as oxidants, calcium fluoride as a slag former and potassium chlorate as a heat generating agent through smelting by adopting a metallothermic reduction method; the Nb-Cr-Al ternary intermediate alloy is evenly mixed with sponge titanium, aluminum shots and Cr70Al alloy in proportion and pressed into an electrode block, then a plasma beam welding box is used for welding the electrode block, a primary electrode is manufactured, vacuum consumable electric arc melting is conducted through a vacuum consumable electric arc furnace, Ti-Al-Nb-Cr alloy is obtained, and the Ti-Al-Nb-Cr alloy is obtained. The high-melting-point Nb-Al intermetallic compound is effectively prevented from appearing in the cast ingot, the uniformity of chemical components of the cast ingot is guaranteed, the stability of the structure and performance of the alloy is guaranteed, and the metallurgical quality and the yield of the cast ingot are effectively improved.

The invention belongs to the technical field of solid waste recycling and wastewater treatment, and particularly relates to a method for combined treatment of organic amine flue gas desulfurization residues and chromium-containing wastewater. According to the method, organic amine flue gas desulfurization residues are used as a reducing agent, phosphoric acid is used for controlling the pH value of wastewater, hexavalent chromium is reduced into trivalent chromium under the acidic condition, meanwhile, desulfurization ash is converted into a melamine phosphate flame-retardant material, and trivalent chromium is separated from water in a precipitation form under the neutral condition; and roasting the precipitate to obtain chromium sesquioxide powder with relatively high purity, and separating and recovering excessive phosphate radicals from the wastewater in the form of calcium phosphate. While the flue gas desulfurization slag and the chromium-containing wastewater are treated, melamine phosphate, chromium trioxide and calcium phosphate byproducts can be recovered, the treatment cost of the wastewater and solid wastes is reduced, and cyclic utilization of resources is realized.

The present invention discloses an antibacterial and antiviral ceramic glaze and a method for preparing a ceramic product, belonging to the technical field of ceramics. The antibacterial and antiviral ceramic glaze comprises the following components: silicon oxide, aluminum oxide, iron oxide, magnesium oxide, potassium oxide, sodium oxide, titanium oxide, manganese oxide, phosphorus pentoxide, sulfur trioxide, barium oxide, zinc oxide, cobalt tetroxide, nickel oxide, chromium sesquioxide and lithium oxide. The prepared antibacterial and antiviral ceramic product has excellent antibacterial and antiviral properties and excellent glaze strength.

The invention discloses an antibacterial and antiviral ceramic glaze and a method for preparing a ceramic product, and belongs to the technical field of ceramics. The antibacterial and antiviral ceramic glaze comprises the following components: silicon oxide, aluminum oxide, iron oxide, magnesium oxide, potassium oxide, sodium oxide, titanium oxide, manganese oxide, phosphorus pentoxide, sulfur trioxide, barium oxide, zinc oxide, cobaltosic oxide, nickel oxide, chromium sesquioxide and lithium oxide. The prepared antibacterial and antiviral ceramic product has excellent antibacterial and antiviral performance and excellent glaze strength.

The invention relates to the field of drying agents special for braking, and particularly discloses a composite bonding composition of a drying agent special for braking and application of the composite bonding composition. The invention relates to a composite bonding composition of a drying agent special for a brake. The composite bonding composition comprises the following components in parts by weight: 15-30 parts of halloysite; 65 to 85 parts of attapulgite; 1-5 parts of silica sol; 1.8-3 parts of a rare earth mixture; the rare earth mixture is a mixture of nickel oxide, cobalt oxide and chromium sesquioxide. The composite bonding composition of the drying agent special for the brake can have a good restraining effect on formation and extension of microcracks in a frequent and violent temperature change environment, stable bonding performance can be kept, and the service life of the drying agent special for the brake is prolonged.

The present application relates to the technical field of firebrick, in particular to a kind of chrome-zirconia corundum composite brick for waste incinerator grate furnace, the composite brick includes the following components by weight parts: white corundum powder 60-75 parts, chromium sesquioxide 7-14 parts, zirconia-silicon carbide composite powder 12-20 parts, magnesium oxide 2-5 parts, kaolin 3-6 parts, binder 1-4 parts;The zirconia-silicon carbide composite powder is made from the following raw materials by weight parts: tetraethyl orthosilicate 0.8-2 parts, anhydrous ethanol 2.5-6 parts, nano zirconia 0.8-1.5 parts, sucrose 2-3 parts, trimethoxysilane 0.4-1 part, deionized water 5.5-6.5 parts.The composite brick of the present application has high density, few internal defects, excellent refractory performance, small deformation under high temperature environment, excellent corrosion resistance, and the damage of incineration slag to the composite brick is small, which can effectively reduce the occurrence of fracture phenomenon and improve the service life of incinerator.

The application discloses a phosphoric acid-containing graphene oxide modified high-temperature anticorrosion ceramic coating material and a high-temperature anticorrosion ceramic coating and belongs to the technical field of high-temperature ceramic coating. The coating material preparation raw material comprises a high-temperature anticorrosion ceramic masterbatch and a phosphoric acid-containing graphene oxide dispersion solution, and the masterbatch components are as follows: 20-30% of silicate adhesive; 10-20% of nano-aluminum nitride; 5-10% of boron nitride; 1-5% of talcum powder; 5-10% of zirconium boride; 10-25% of chromium sesquioxide; 10-20% of aluminum oxide; 1-5% of cerium oxide; and the balance of water. The phosphoric acid-containing graphene oxide dispersion solution is directly applied to the high-temperature ceramic coating material, on the one hand, the problem of utilization of wastewater containing phosphoric acid prepared by a chemical method is solved, and on the other hand, the graphene oxide is used as a hydrophilic two-dimensional network structure to improve the properties of the coating, such as high-temperature resistance, oxidation resistance, high strength, high-temperature gas erosion resistance and the like, in cooperation with the high-temperature anticorrosion ceramic masterbatch.

The invention discloses a method for preparing a chromic oxide and sodium sulfate solution from chromium-containing sodium hydrogen sulfate, which comprises the following steps: preparing chromium-containing sodium hydrogen sulfate into a sheet by a sheet preparation machine, and calcining to obtain a calcined product; adding the calcined product into water to prepare a feed liquid, then adding sodium hydroxide for neutralization to prepare a mixed solution of chromic hydroxide and sodium sulfate, carrying out heat preservation and curing, then carrying out filter pressing to obtain a filter cake, then washing and carrying out filter pressing on the filter cake to obtain a chromic hydroxide filter cake, and carrying out filter pressing to obtain a filtrate which is a sodium sulfate solution; and calcining the chromium hydroxide filter cake to obtain chromium sesquioxide. According to the resource utilization method for the by-product chromium-containing sodium hydrogen sulfate in the chromic anhydride production process, the chromium-containing sodium hydrogen sulfate is converted into chromium sesquioxide and sodium sulfate solutions with high additional values, the problem of poison of waste is solved, and efficient recycling of chromium and sodium hydrogen sulfate is achieved; in addition, the method is simple in process, low in cost and suitable for industrial production.

The invention relates to the field of metallurgy, and provides a vanadium-chromium precursor alloy for hydrogen storage and a preparation method thereof.The method comprises the steps that vanadium pentoxide, chromium sesquioxide, aluminum particles and a slag former are mixed to obtain a mixed furnace burden; the mixed furnace burden is put into a furnace body to be smelted in advance, ignition smelting and electrified refining are carried out, and an alloy cake is obtained; and putting the alloy cake into a water tank for water quenching, soaking for a preset time, and then crushing and screening to obtain the vanadium-chromium precursor alloy. According to the method, the aluminothermic reduction formula and process are deeply optimized, and the high-quality vanadium-chromium alloy is directly prepared from the oxide. The oxygen content and the impurity level in the alloy can be effectively reduced, the alloy purity is remarkably improved, accurate regulation and control of vanadium and chromium components can be achieved, the subsequent hydrogen storage alloy synthesis requirement is met, rich slag generated after refining can be returned to the technological process to be reused, the resource utilization rate is greatly increased, and the production cost is reduced.

The present application belongs to the technical field of ceramic surface treatment, and particularly relates to a ceramic surface protective agent and a preparation method and use method thereof. The ceramic surface protective agent comprises, in parts by weight, 79-92 parts of a condensate, 2-5 parts of an intermediate, 1-3 parts of an emulsifier, 3-8 parts of a zirconium sol, 0.5-2 parts of a nano filler, and 1-3 parts of a hardening agent. The condensate is solid paraffin, the intermediate is glycerol or 1,2-propanediol, the nano filler is a mixture of one or more of zirconium oxide, yttrium sesquioxide and chromium sesquioxide, and the hardening agent is polyethylene wax. The present application aims to develop a new type of ceramic protective agent and a preparation method and use method thereof, greatly improve the corrosion resistance of ceramic plates, and simultaneously have excellent antifouling performance.

The invention relates to the technical field of preparation of high-purity chromium metal, in particular to a preparation method of high-purity chromium metal. The method comprises the following steps: (1) preparing a chromium trichloride solution; (2) purification: purifying the prepared chromium trichloride solution by an ion exchange method; (3) performing spray pyrolysis to prepare chromium sesquioxide; (4) gas-solid separation; and (5) chromium sesquioxide is reduced to prepare high-purity metal chromium. The method comprises the following steps: preparing a chromium trichloride solution by using metal chromium of 3N5, purifying the chromium trichloride solution by using an ion exchange method to remove heavy metal impurities in the chromium trichloride solution, and performing spray pyrolysis on the purified chromium trichloride solution to prepare high-purity chromium sesquioxide powder. Metal and interstitial element impurities such as oxygen, nitrogen and the like and low-melting-point metal impurities in the chromium sesquioxide are removed through a reduction method, and the purity of the prepared high-purity metal chromium reaches 99.999% or above. The preparation method is simple in process and few in control parameters, and the prepared chromium metal is high in purity.