91 results about "Chromium phosphate" patented technology

The invention discloses a low-dielectric high-temperature-resistant phosphate-silicon dioxide coating, with the mass percentage content between the components and the raw material as follows: 50-80% of percentage content of inorganic compound binder, 15-50% of high-temperature filler, 0.5-1.5 wt% of curing agent, 2-5 wt% of thickener, and 0.3-1.5wt% of surfactant; the inorganic compound binder is the mixture of aluminum phosphate or aluminium-chromium phosphate and silicon collosol; the high-temperature resistant filler is the mixture of fused quartz powder and refined quartz powder or alpha-Al2O3 power; the curing agent is MgO; the thickener is fumed silica; the surfactant is non-ionic surfactant. The phosphate binder is firstly prepared, followed by phosphate/silicon collosol compound binder; then the non-ionic surfactant and the high-temperature resistant filler are added to the compound binder, followed by the thickener and the curing agent, then the mixture is evenly mixed. The invention can be used for the surface protection of porous inorganic materials or non-porous inorganic materials and is typically used as wave-transparent material for aerospace crafts.

The invention discloses a method for resource utilization of various metals in electroplating sludge, relates to recycling utilization of sludge containing various metals, and particularly discloses a method of extraction separation and high-value utilization of chromium, copper, nickel and zinc in chromium-containing electroplating sludge. The method is characterized by performing chromium precipitation in raffinate to obtain a chromium precipitation material of chromium phosphate after extracting copper from leachate of the electroplating sludge, removing phosphate radicals by using NaOH alkali liquor, then, re-dissolving chromic hydroxide obtained by filtering and separating, performing evaporative crystallization, preparing chromium sulfate basic, and recycling the alkali liquor, wherein copper, nickel and zinc are separated and recycled stepwise in the process. An environment-friendly electroplating sludge high-value utilization hydrometallurgy technology with simple processes and short flows is provided.

The invention discloses a method for manufacturing a high insulation resistor FeSiCr metal soft-magnetic material. The method includes melting; gas and water combined atomization; screening; powder classification matching; mixing; powder passivating; stirring and coating; pelletizing; compression moulding; and sintering. (6) powder passivating: preheating powder to the temperature of 75-90 DEG C, adding a mixed solution of 0.1-0.35 wt% of manganese phosphate and 0.1-0.35 wt% of chromium phosphate with respect to the powder, performing stirring for 10-15 min, performing drying at the temperature of 120 DEG C for 2 hours, and performing screening through a 100-mesh screen. The method can effectively overcome the defects that the insulation resistance is low, the withstand voltage is low, and the coating layer is not even and is not compact in the conventional processes; and according to the high insulation resistor FeSiCr metal soft-magnetic material acquired by the method, the insulation resistance IR is greater than 1G Ohm, the withstand voltage is greater than 100 V, and the magnetic conductivity is 60 (1+/-20%).

Disclosed herein are a metal(III)-chromium-phosphate complex represented by a formula of M(III)_xCr(HPO₄)_y(H₂PO₄)_z and the use thereof. More particularly, disclosed are an organic/inorganic composite electrolyte membrane comprising said complex, an electrode comprising said complex, a membrane-electrode assembly (MEA) comprising said organic/inorganic composite electrolyte membrane and/or electrode, and a fuel cell comprising said membrane-electrode assembly.

The invention relates to a fiber-reinforced zinc and aluminum phosphate matrix composite and a preparation method thereof, relating to a fiber-reinforced composite and a preparation method thereof. The invention solves the problems of high curing temperature of the prior aluminum phosphate material or the carcinogenicity of chrome in a chrome and aluminum phosphate material. The fiber-reinforced zinc and aluminum phosphate matrix composite of the invention is prepared from the fiber-reinforced material and a gelation material of zinc and aluminum phosphate; the preparation method comprises the following processes that under condition of 200 to 600 DEG C, heat treatment is carried out for the fiber-reinforced material for 10 minutes to an hour; then the fiber-reinforced zinc and aluminum phosphate matrix composite is prepared according to a compression molding technology; the process parameters are the molding temperature of 85 to 300 DEG C, the molding pressure of 2 to 15MPa, and the molding time of 6 to 35 hours. The product of the invention has high temperature resistance and good mechanical properties, without toxic substance; the product of the invention can be cured under 170 DEG C, with the bending strength under the room temperature up to 70 to 140MPa; the thermal weight loss is less than 8 percent when the composite is heated to 600 DEG C. The method of the invention is simple in technology, easy in material obtaining, low in cost, easy in popularization and utilization, and suitable for large-scale industrial production.

Disclosed is an aqueous solution of a chromium salt, in which the oxalic acid content is 8% by weight or less relative to chromium. In the aqueous solution of the chromium salt, the total organic carbon content is 4% by weight or less relative to chromium. The chromium salt is preferably a chromium chloride, a chromium phosphate, or a chromium nitrate. The chromium chloride preferably contains a basic chromium chloride represented by the composition formula Cr(OH)_xCl_y (wherein 0<x≦2, 1≦y<3, and x+y=3). The chromium phosphate is preferably one represented by the composition formula Cr(H_3−3/nPO₄)_n (wherein n is a number satisfying 2≦n≦3). The chromium nitrate is preferably a basic chromium nitrate represented by the composition formula Cr(OH)_x(NO₃)_y (wherein 0<x≦2, 1≦y<3, and x+y=3).

The invention discloses a preparation method of corundum honeycomb ceramic with slag resistance. The method comprises the following steps: following raw materials of bauxite, kaolin, soapstone and feldspar are added in a ball mill according to proportion and are mulled into mixed material, then the mixed material is added in a kneader, then a proper amount of water and adhesive agent are added in the kneader, then the triteness, the pug milling, the drying, the cutting and the high-temperature sintering are performed after kneading to obtain a honeycomb ceramic, aluminium-chromium phosphate solution is coated on the surface of the inner wall of a corundum honeycomb ceramic hole, then the corundum honeycomb ceramic is dried and then baked at 1380 DEG C, and the aluminium-chromium phosphate is dehydrated, cured and stuck on the surface of the inner wall of the corundum honeycomb ceramic hole. The prepared honeycomb ceramic not only has high specific surface area, high porosity and good heat storage property; since an aluminium-chromium phosphate compound protective layer is coated on the surface of the inner wall of the honeycomb ceramic hole, the protective layer does not react with the ferrous oxide in the iron scale and is not stuck with the liquid-phase residue formed by the iron scale at the high temperature to ensure that the honeycomb ceramic hole is not blocked, the slag resistance of the corundum honeycomb ceramic is enhanced and the service life of the corundum honeycomb ceramic is prolonged.

The invention relates to a silicon carbide ramming material high in abrasion resistance, which comprises the following components in part by weight: 55-78 parts of superfine silicon carbides, 5-15 parts of alpha type silicon nitrides, 5-10 parts of zirconium corundum, 1-7 parts of aluminum oxide powder and silicon dioxide powder, 9-13 parts of aluminum chromium phosphates, 0.5-5 parts of coagulation accelerators, 0-2.5 parts of iodine bismuth oxyiodide tannates and 0.3-0.7 parts of anti-explosion fibers, wherein the mixture of active rho-aluminum oxide and magnesium oxide is taken as the coagulation accelerators, and the diameter of the anti-explosion fibers is 1.5-2.5 microns. The silicon carbide ramming material high in abrasion resistance, which is provided by the invention, is high instrength after being naturally dried, is excellent in abrasion resistance at high temperature, is high in heat transfer coefficient, is low in linear contractibility rate and is long in service life.

The invention discloses a thermal spraying coating sealing agent, a preparation method and a use method, comprising aluminum chromium phosphate and filler in a weight ratio of 10:1-3; the aluminum chromium phosphate comprises 95-105 parts by weight of phosphoric acid , 23-26.5 parts of aluminum hydroxide, 9.5-11.5 parts of chromic anhydride and 4-6 parts of methanol, and the filler is Cr ₂ o ₃ . Mix phosphoric acid and chromic anhydride, stir in water bath at 70-90°C until fully dissolved; then add aluminum hydroxide and stir until fully dissolved; then slowly drop methanol to make it fully react, and bathe in water at 70-90°C for 15- 25min, obtain dark green viscous aluminum chromium phosphate solution; Add Cr ₂ o ₃ The filler is uniformly dispersed in the aluminum chromium phosphate solution to obtain the sealing agent. After the system is solidified, as the temperature continues to rise, there will be no thermal effect in the system within 1000 ° C. Aluminum chromium phosphate has good high temperature resistance. The raw material of the sealing agent of the invention is cheap and easy to obtain, the application process is simple, the operation is convenient, and the sealing period is short.

The invention discloses a preparation method of a mullite whisker in-situ toughened chromium phosphate aluminum wave-transmitting material. The method is characterized by the following steps of: dissolving a phosphorus-containing compound into absolute ethyl alcohol or water, adding an aluminum-containing compound and a chromium-containing compound at the temperature of 50-100 DEG C while stirring for reacting, and adding ammonia water, citric acid or methanol for reacting to obtain a chromium phosphate aluminum precursor; putting the chromium phosphate aluminum precursor, the aluminum-containing compound, a silicon-containing compound, aluminum fluoride and water or alcohol into a ball milling device for performing ball milling to obtain a mixture; and drying the mixture, grinding, sieving, performing press forming on the minus sieve, i.e., sintering precursor powder, and calcining in an enclosed container at the temperature of 1,200-1,500 DEG C for 1-24 hours to obtain the mullite whisker in-situ toughened chromium phosphate aluminum wave-transmitting material. The method has the advantages of in-situ growth of mullite whiskers, uniform distribution of the whiskers, dense substrate sintering, good toughening effect, high performance of the wave-transmitting material, applicability of the wave-transmitting material to antenna covers of flying vehicles, radar antenna covers and the like.

The invention provides a no-waste utilization method of heavy metal-contained sludge. The heavy metal-contained sludge includes copper, chromium and iron elements; and the no-waste utilization method comprises the following steps: (S1) acidophilia microorganisms are added in the heavy metal-contained sludge for biological leaching treatment and solid-liquid separation to prepare leaching slag and leaching liquid; (S2) hydroxamic extracting agent solution with selectivity on copper is adopted to extract the leaching liquid prepared in the step (S1) to prepare copper-contained extracting liquid capable of singly recovering copper and raffinate A; (S3) sulfite is added in the raffinate A to adjust the solution pH value of not more than 2.0, is heated, and is added in phosphate to prepare chromium phosphate precipitates capable of singly recovering chromium; and (S4) remained solution B after chromium precipitation in the step (S3) is treated by an oxidizing agent; the solution pH value is adjusted within 1.0-1.5; and sodium sulfate is added under the condition of 80-95 DEG C to prepare sodium jarosit capable of singly recovering iron. The no-waste utilization method has the advantages of comprehensive sludge utilization, high utilization rate and no pollution.

The invention discloses a method for separating and refining iron and chromium from polymetallic hazardous waste. The phosphate radicals carried by sludge are utilized to precipitate Fe<3+> selectively for preparing iron phosphate and isolating Fe<3+> from Cr<3+>, and since Cr<3+> can be precipitated by the phosphate radicals, a method of excessive Fe<3+> is adopted to prevent the formation of chromium phosphate precipitation in the process; the residual Fe<3+> can be reduced to Fe<2+> by scrap iron, then an alkaline solution is added to adjust the pH to a certain value so as to selectively precipitate Cr<3+> for preparing chromium hydroxide, and further separation of iron and chromium can be achieved. According to the method for separating and refining iron and chromium from the polymetallic hazardous waste, no heating is needed during the whole process, ferric ions and the phosphate radicals in the hazardous waste are comprehensively utilized, and thus the cost is low; meanwhile, no waste water and waste residues are produced, and thus the method is environment-friendly; iron phosphate and chromium hydroxide can be obtained from respective extraction, wherein iron phosphate has high economic values and can be used in battery materials, ceramics and other raw materials, and chromium hydroxide can be used in pigments, chemicals and other industry raw materials.

An acidic aqueous solution containing a water soluble trivalent chromium compound is provided with a additive for improving corrosion resistance and reducing precipitation of trivalent chromium over time. A suitable additive is nitrilotris (methylene) triphosphonic acid (NTMP).

The invention discloses a method for producing anisole by catalyzing phenol and methanol. According to the method, a fixed bed reactor is adopted, carriers such as zinc phosphate, iron phosphate, copper phosphate and chromium phosphate load modified components such as cerium nitrate, zirconium nitrate, lanthanum nitrate, cobalt nitrate and nickel nitrate and assistants such as potassium fluoride,cesium fluoride and sodium fluoride to serve as a catalyst, the anisole is efficiently synthetized, the phenol conversion rate and anisole selectivity are high, and the catalyst is simple in preparation process, low in cost, high in stability and long in service life, and meets the application requirements of industrial catalysts.

A method for manufacturing an aluminum heat exchanger includes the steps of: obtaining a heat exchanger tube 2 by forming a Zn thermally sprayed layer on a surface of an aluminum flat tube core so as to adjust Zn adhesion amount to 1 to 10 g/m²; obtaining a heat exchanger core by alternatively arranging the heat exchanger tube 2 and an aluminum fin 3 and brazing the heat exchanger tube and the fin with end portions of the heat exchanger tube connected to aluminum headers in fluid communication; and forming a chemical conversion treatment coat (corrosion resistance coat) on a surface of the heat exchanger core by subjecting the surface of the heat exchanger core to chemical conversion treatment using at least one chemical conversion treatment agent selected from the group consisting of phosphoric acid chromate, chromic acid chromate, phosphoric acid zirconium series, phosphoric acid titanium series, fluoridation zirconium series, and fluoridation titanium series. The obtained heat exchanger has a long last good corrosion resistance and can prevent occurrence of fin detachment and pit corrosion.

The invention relates to the field of resource utilization of electroplating sludge, in particular to a recycling treatment method of electroplating sludge. The recycling treatment method comprises the following steps: carrying out oxidation alkaline leaching on electroplating sludge after leaching, copper extraction and impurity removal, wherein the oxidation alkaline leaching is carried out in sodium hydroxide and an oxidizing agent, and the terminal alkalinity of the oxidation alkaline leaching is 10-80 g/L in terms of sodium hydroxide. According to the method, high-quality crystallized copper salt, crystallized nickel salt, crystallized zinc salt, crystallized sodium salt, chromium phosphate, sodium phosphate and other products can be produced, detoxified gypsum can be used for cement and brick making, ferric hydroxide and aluminum hydroxide can be sent to a steel plant or an aluminum plant for use, and no waste residues are discharged in the whole technological process. All process wastewater is recycled, so that zero discharge of wastewater can be realized. Copper, nickel, zinc, chromium, phosphorus and the like in the electroplating sludge are all efficiently recovered, the technological process is simple, the production efficiency is high, industrialization is easy to achieve, the equipment composition is simple, the product quality is good, and the recovery rate is high.

The invention relates to a method for recycling ceramic-grade iron phosphate for multi-metal dangerous waste. The method comprises the steps that phosphorization wastewater treatment sludge containingmulti-metal is matched with sludge containing Fe3+, acid pickling is conducted, iron phosphate sediment is generated under pH of 2.0-2.5 and separated from other kinds of metal, dissolution and reduction are conducted, and a small number of copper ions are removed; the pH is adjusted to 3.5-3.8, and a small amount of chromium is removed through a chromium phosphate form; finally, hydrogen peroxide is added for generating iron phosphate whit Fe3+ and phosphate groups, the pH of diluted acid is adjusted to 2.1-2.5, stirring and filtering are conducted, and filter cake is ceramic-grade iron phosphate. According to the method, a full-wet-method process is adopted, heating is not needed, the equipment and the operation method are simple, and the cost is low; the medical agent is monotonous inkind and environmentally friendly; the extracted ceramic-grade iron phosphate products are high in additional value and can be directly applied to raw materials of industries such as ceramics, adhesive, pigment and chemical engineering.

The invention discloses a preparation method of inorganic suspension coating which is prepared by the mixing of phosphate binder and metal ceramic composite powder. The phosphate binder comprises the following components according to proportion: the concentration of AL(H2PO4)3 is 30-60 percent, and the concentration of CrO3 is 60-80g/l; and the composite powder comprises the following components according to mass percentage: 1-25 percent of Ti, 1-15 percent of Si, 5-25 percent of BN, and the balance of Al. The preparation method comprises the following steps: firstly preparing aluminium-chromium phosphate solution, then preparing the metal ceramic composite powder, and finally uniformly mixing the phosphate binder with the metal ceramic composite powder in a mechanical blending manner to prepare the inorganic suspension coating. The coating prepared by the method has the characteristics of being low in cost, easy for maintenance and adjustment, free from thermal influence on substrate during coating, good in obturage effect and the like, can meet the low temperature and obturage requirements of various aircraft engine parts, and has wide application prospect.