30results about "Selenium/tellurium oxyacid salts" patented technology

A method for fabricating an IBIIIAVIA-group amorphous compound used for thin-film solar cells is provided. A mixture solution including elements of Group IB, IIIA, VIA or combinations thereof is provided. The mixture solution is heated and filtered. IBIIIAVIA-group amorphous powders are acquired after drying the heated and filtered mixture solution.

The invention discloses a method for separating selenium, tellurium, arsenic, copper, lead and silver and enriching gold from copper anode mud, and relates to the technical field of rare and preciousmetal metallurgy. The method comprises the following steps that roasted products obtained through low-temperature oxidization roasting of the copper anode mud and sodium hydroxide react to obtain selenium, tellurium and arsenic containing leaching liquor and alkaline leaching slag; the leaching liquor and whitewash react to obtain a selenium and tellurium containing solution and calcium arsenate slag; the alkaline leaching slag and sulfuric acid react to obtain copper sulfate and acid leaching slag; sulfuric acid and the selenium and tellurium containing solution react to obtain telluric acidand a selenium containing solution; the acid leaching slag and nitric acid react to obtain a silver nitrate solution and lead and gold slag; silver nitrate and hydrochloric acid react to obtain silverchloride and nitric acid; the lead and gold slag and a sodium carbonate solution react to obtain carbonization slag and a sodium sulfate solution; the carbonization slag and nitric acid react to obtain a lead nitrate solution and gold containing enrichment; and the lead nitrate solution and sulfuric acid react to obtain a lead sulfate and sulfuric acid solution. The method aims to solve the problems that existing methods for recycling metal from copper anode mud, the cost is high, recycled metal is single, and the comprehensive recovery effect is poor.

The method and process of treatment of selenium containing materials, including, but not limited to, different adsorbents, membranes, filters, bioreactor sludge obtained from water treatment, waste electronic devices, material obtained from mineral processing, different industrial wastes, metallurgical wastes, which allow reduction of total selenium content in the material and selenium recovery have been developed.

The invention particularly relates to a method for extracting mercury from heavy-metal-related acid mud, belonging to the technical field of resources and environment. The method comprises the following steps that step 1, the heavy-metal-related acid mud and hydrochloric acid are added into water and are heated; then potassium chlorate is added; reaction is performed at certain temperature to obtain a mixed liquid containing mercuric chloride; step 2, alkali is added in for neutralization to control pH, so that a mixed solution containing mercuric oxide sediment and Na2SeO3 is obtained; solid-liquid separation is performed, and a selenium-containing solution enters a selenium separation system for recycling selenium; step 3, the mercury oxide sediment obtained through separation in the step 2 is dried and is rectified by adopting a continuous vacuum rectification method; and generated mercury steam is condensed and recycled to obtained refined mercury. According to the method, a wet technique is adopted for processing, so that high-efficient separation of mercury and selenium is realized; then the high-purity mercury product is manufactured through continuous vacuum rectification; and smoke pollution caused by direct roasting of the acid mud is avoided.

A method of producing mineral-rich algae by growing algae with an algae biofilm growing apparatus, wherein the algae is fed a mineral-rich feed stock. Furthermore, the mineral-rich algae is harvested and used as a foodstuff for human and animal consumption.

The invention discloses a preparation method for preparing silver tellurite through subjecting a silver ammonia solution to a reaction with tellurite as well as provides novel crystalline solar cell positive pole silver paste by means of directly adding the silver tellurite prepared by the method and improved inorganic glass powder based on original raw materials and a method for preparing the crystalline solar cell positive pole silver paste. According to the invention, the design is ingenious; and through directly adding the silver tellurite and the high-selection-ratio corrosive inorganic glass powder, conditions are created for ohmic contact for silver and silicon, meanwhile, high-temperature conditions required for precipitating adequate silver tellurite from the glass powder are avoided, and the integrity of PN junctions cannot be affected by high temperatures, so that the contradiction is solved, and the window for sintering temperatures is widened.

The invention relates to a method for leaching selenium from cadmium selenide waste. The method adopts two-section oxygen pressure alkaline leaching; the cadmium selenide waste is subjected to first-section oxygen pressure alkaline leaching, and the leaching residue of the first-section oxygen pressure alkaline leaching is used as the raw material of second-section oxygen pressure alkaline leaching; the leaching liquid of the second-section oxygen pressure alkaline leaching returns to a leaching agent of the first-section oxygen pressure alkaline leaching; and the first-section oxygen pressure alkaline leaching and second-section oxygen pressure alkaline leaching are both performed in a high-pressure reaction kettle, and oxygen is introduced to both as an oxidizing agent. In the method provided by the invention, selenium in the cadmium selenide waste exists in the leachate totally in a form of sodium selenite, thereby being safe and environment-friendly; and the selenium recovery rate is high, and the cost is low.

The invention discloses a purple inorganic pigment based on a Mg3TeO6 structure as well as a preparation method and application thereof, the molecular formula of the purple inorganic pigment is Mg<3-2x>MnxLixTeO6, and x is more than or equal to 0.02 and less than or equal to 0.15; and the preparation method of the purple inorganic pigment comprises the following steps: mixing and grinding a magnesium-containing compound, a tellurium-containing compound, a manganese-containing compound and Li2CO3 in proportion, calcining at 750-900 DEG C, and cooling to obtain the purple inorganic pigment. The purple inorganic pigment is resistant to acid, alkali and high temperature, the preparation method is environmentally friendly, the raw materials are cheap and non-toxic, and the purple inorganic pigment can be applied to chemical production of paint, coatings, paintings, plastics and rubber.

The invention belongs to the technical field of new energy materials, and provides a flexible Bi2O2Se-based electrode material as well as a preparation method and application thereof in order to solve the problem that a Bi2O2Se flexible material and a Bi2O2Se flexible material serving as a negative electrode material cannot be applied to a flexible battery at present. The preparation method comprises the following steps: mixing and dissolving carbon nanotubes, bismuth salt and a selenium source, carrying out a liquid-phase oil bath heating reaction, drying to obtain powder, dispersing the powder and graphene in an ethanol aqueous solution for a composite reaction, carrying out suction filtration to form a film, and sintering to obtain the flexible Bi2O2Se-based electrode material. The flexible electrode material is prepared through liquid phase reaction and carbonization treatment, and has high reversible capacity, stable cycle performance and excellent rate capability. The flexible electrode can be directly used as a battery negative electrode without adding a binder, a conductive agent and a current collector, the process is simplified, and the development of the flexible electrode is facilitated. The prepared flexible sodium-ion battery negative electrode material has excellent flexibility, high specific capacity, high rate capability, excellent cycling stability and high yield, and can be used for electrodes of sodium-ion batteries, and is suitable for flexible sodium-ion battery negative electrode materials.

The application discloses a copper indium gallium diselenide treatment method, comprising the steps of adding sodium carbonate into copper indium gallium diselenide for sintering to obtain carbon dioxide and a sintered material, wherein the sintered material is a mixture of sodium selenite and copper indium gallium oxide; adding sulfuric acid to the sintered material for leaching, and filtering toobtain a mixed solution containing copper sulfate, gallium sulfate, indium sulfate and sodium selenite; subjecting the mixed solution containing copper sulfate, gallium sulfate, indium sulfate and sodium selenite to ion exchange through anion exchange resin to obtain copper indium gallium solution; desorbing the anion exchange resin to obtain high-purity selenium; treating the copper indium gallium solution to obtain copper, indium and gallium. The copper indium gallium waste mainly includes selenides; sodium carbonate sintering is performed to convert copper indium gallium diselenide into anoxide easily soluble in an acid; the consumption of acids and strong antioxidants is reduced.

The invention discloses a method for reextracting tellurium by using an alkali. The problem that the utilization rate of a raw material is low when a method in the prior art is applied to the tellurium extraction in tellurium ore is solved. The method comprises the following steps of (1), obtaining iron removed hydrochloric acid immersion liquor; (2), adding TBP (Tributyl Phosphate) with the volume fraction of 55 to 65 percent into the hydrochloric acid immersion liquor, extracting, and separating out an oil phase; (3), adding a sodium hydroxide solution with the concentration of 1.5mol / L to 2.5mol / L into the oil phase, and reextracting, so as to obtain a tellurium-containing product; (4), drying the tellurium-containing product to subsequently obtain a finished product. The method has theadvantages that the process route is relatively simple, the utilization rate of the raw material is high, the purity reaches 98 percent or above, the yield reaches 90 percent or above and the like.

The invention discloses a method for controlling the content of tellurium dioxide, the content of anhydrous tellurite and the content of trihydrate tellurite in a tellurite product. The method comprises the following steps that firstly, alkali metal hydroxide and tellurium dioxide are reacted in an aqueous solution with the mole ratio of 2.00:(1.00-1.15) to obtain a tellurite solution; secondly, alkali metal hydroxide is added in the tellurite solution, wherein the adding amount of alkali metal hydroxide accounts for X of alkali metal hydroxide in the first step by weight, different numerical value ranges are selected from X to control the content of tellurium dioxide, the content of anhydrous tellurite and the content of trihydrate tellurite in the tellurite product, and X is larger than zero and smaller than or equal to 8.00%. By means of the method, high-purity potassium tellurite can be prepared, and high-purity needle-like trihydrate potassium tellurite can also be prepared in an industrialized mode.

The invention belongs to the field of chemical separation, and relates to a preparation method of a cellulose acetate-based composite membrane. The method comprises the steps of preparing a metal salt and a precipitant into a solution according to a molar volume ratio of the metal salt to the precipitant to water being 1 mol: (1-2) mol: (50-80) mL, carrying out a hydrothermal reaction at the temperature of 70-150 DEG C for 8-12 h, cooling to room temperature, carrying out precipitate centrifugal washing, drying at the temperature of 60-80 DEG C for 5-12 h, and calcining in air at the temperature of 300-600 DEG C for 1-5 h; and then mixing the metal oxide, cellulose acetate, polyvinylpyrrolidone and polyethylene glycol, stirring at the temperature of 50-80 DEG C for 4-9 hours, standing and cooling, casting the mixed solution on the surface of a glass plate, and immersing the glass plate into a non-solvent, thereby obtaining the product. The prepared composite membrane is applied to dynamic separation and recovery of tellurium in a tellurium-containing solution. The preparation method disclosed by the invention is low in cost and simple to operate, and the obtained composite membrane has high separation efficiency, circularity, pollution resistance and stability, is applied to the field of chemical separation, and has important significance on recycling of scattered element resources and environmental protection.

The invention discloses a method and application for preparing sodium selenite from selenium dioxide containing bismuth and copper, and belongs to the technical field of recycling and reuse of non-ferrous metal metallurgy byproducts. According to the method, crude selenium dioxide generated from a recycled precious metal system is treated with processes of hydrolysis bismuth removal and vulcanization copper removal, then sodium selenite can be generated, chlorine and sulfur added in the bismuth removal and copper removal process are essential mineral elements in animal bodies and can join in substance metabolism inside the animal bodies, and if sodium selenite is used as a feed additive, the absorption effect of animal feed can be improved; bismuth and copper as impurities in crude sodium selenite can be effectively utilized. The method is short in process procedure, the whole process is a sealed circulation system, the environment is not polluted, and requirements of clean production can be met.

A compound medicine for treating acute and chronic hepatitis B, includes a polyphenolic selenium compound having a functional group of alkali metal ion and selenium coordination complex, which has functions of directly killing HBV and destroying replication template of HBV. Auxiliary formulas thereof include high-purity oxymatrine and glycyrrhizin sulfate. The oxymatrine has an effect of anti-HBV, and is capable of treating acute and chronic hepatitis B, regulating immune system and increasing leukocyte. Serving as a main hepatocyte membrane protective agent, the glycyrrhizin sulfate has not only an effect of anti-inflammation, but also it is capable of regulating immune system and protecting hepatocyte. The compound medicine has no toxicity or side effect.

The invention discloses a high-pressure preparation method of a quadrature-phase copper tellurium oxide, and belongs to the technical field of magnetic material preparation. The molecular formula of the copper tellurium oxide is Cu3TeO6, and the copper tellurium oxide has a monoclinic crystal structure. According to the preparation method, cubic-phase copper tellurium oxide formed by sintering copper oxide powder and tellurium dioxide powder is used as a precursor, synthesis is carried out on a high-pressure device, and the synthesis pressure is 17 GPa or above. The method disclosed by the invention is carried out in an anhydrous and modifier-free environment, so that unnecessary impurities can be avoided, and the purity of the obtained quadrature-phase copper tellurium oxide is high.

The invention particularly relates to a method for extracting mercury from heavy-metal-related acid mud, belonging to the technical field of resources and environment. The method comprises the following steps that step 1, the heavy-metal-related acid mud and hydrochloric acid are added into water and are heated; then potassium chlorate is added; reaction is performed at certain temperature to obtain a mixed liquid containing mercuric chloride; step 2, alkali is added in for neutralization to control pH, so that a mixed solution containing mercuric oxide sediment and Na2SeO3 is obtained; solid-liquid separation is performed, and a selenium-containing solution enters a selenium separation system for recycling selenium; step 3, the mercury oxide sediment obtained through separation in the step 2 is dried and is rectified by adopting a continuous vacuum rectification method; and generated mercury steam is condensed and recycled to obtained refined mercury. According to the method, a wet technique is adopted for processing, so that high-efficient separation of mercury and selenium is realized; then the high-purity mercury product is manufactured through continuous vacuum rectification; and smoke pollution caused by direct roasting of the acid mud is avoided.

The invention provides a method for reducing hexavalent selenium into tetravalent selenium, and relates to the technical field of chemical recovery. The method for reducing hexavalent selenium into tetravalent selenium comprises the following steps: dissolving a hexavalent selenium compound in water to form a hexavalent selenium solution, and heating the hexavalent selenium solution to 70-90 DEG C; and adding hydrochloric acid into the hexavalent selenium solution, performing stirring and reaction until the potential value of the solution is 900-960mv, and stopping the reaction. According to the method, the solution system reaches the reduction potential of selenium by utilizing the reducibility of hydrochloric acid, so that hexavalent selenium which is difficult to be reduced into elementary substance by a conventional reducing agent (such as sodium sulfite) is reduced into tetravalent selenium which is easy to be reduced into elementary substance, and the selenium can be effectively recovered into elementary substance.

The present invention relates to a method for removing radioactive element thorium in a rare earth mineral, comprising: mixing the rare earth mineral with selenium dioxide in water, reacting radioactive element thorium with selenium dioxide by hydrothermal method, cooling to form a crystal, and separating the crystal to remove the radioactive element thorium. In the invention, tetravalent element thorium is selectively bound to inorganic ligand selenium dioxide in a hydrothermal environment to form a crystal, thereby achieving removal of radioactive element thorium. The method has high crystallization rate and high decontamination efficiency, and removes thorium from trivalent lanthanide element by crystallization solidification under a uniform reaction condition. Compared to a conventional industrial method for thorium separation, the method has low energy consumption and high separation ratio, enables one-step solidification separation, and effectively avoids the disadvantages of redundant separation operations and a large amount of organic and radioactive liquid wastes.

The invention discloses a method for controlling the content of tellurium dioxide, the content of anhydrous tellurite and the content of trihydrate tellurite in a tellurite product. The method comprises the following steps that firstly, alkali metal hydroxide and tellurium dioxide are reacted in an aqueous solution with the mole ratio of 2.00:(1.00-1.15) to obtain a tellurite solution; secondly, alkali metal hydroxide is added in the tellurite solution, wherein the adding amount of alkali metal hydroxide accounts for X of alkali metal hydroxide in the first step by weight, different numerical value ranges are selected from X to control the content of tellurium dioxide, the content of anhydrous tellurite and the content of trihydrate tellurite in the tellurite product, and X is larger than zero and smaller than or equal to 8.00%. By means of the method, high-purity potassium tellurite can be prepared, and high-purity needle-like trihydrate potassium tellurite can also be prepared in an industrialized mode.

The invention discloses a method and application for preparing sodium selenite from selenium dioxide containing bismuth and copper, and belongs to the technical field of recycling and reuse of non-ferrous metal metallurgy byproducts. According to the method, crude selenium dioxide generated from a recycled precious metal system is treated with processes of hydrolysis bismuth removal and vulcanization copper removal, then sodium selenite can be generated, chlorine and sulfur added in the bismuth removal and copper removal process are essential mineral elements in animal bodies and can join in substance metabolism inside the animal bodies, and if sodium selenite is used as a feed additive, the absorption effect of animal feed can be improved; bismuth and copper as impurities in crude sodium selenite can be effectively utilized. The method is short in process procedure, the whole process is a sealed circulation system, the environment is not polluted, and requirements of clean production can be met.

The invention discloses a method for separating selenium, tellurium, arsenic, copper, lead, silver and enrichment of gold from copper anode slime, and relates to the technical field of rare and precious metal metallurgy. Sodium reacts to obtain selenium-tellurium-containing arsenic leaching solution and alkali leaching residue; the leaching solution reacts with lime water to obtain selenium-tellurium-containing solution and calcium arsenate residue; alkali leaching residue reacts with sulfuric acid to obtain copper sulfate and acid leaching residue; Reaction to obtain telluric acid and selenium-containing solution; react acid leaching residue with nitric acid to obtain silver nitrate solution and lead gold residue; react silver nitrate and hydrochloric acid to obtain silver chloride and nitric acid; react lead gold residue with sodium carbonate solution to obtain carbonized residue and sodium sulfate solution; react the carbonized slag with nitric acid to obtain lead nitrate solution and gold-containing enrichment; react lead nitrate solution with sulfuric acid to obtain lead sulfate and nitric acid solution. The purpose of the invention is to solve the problems of high cost, single recovered metal and poor comprehensive recovery effect in the existing method for recovering metal from copper anode slime.