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

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.

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 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 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 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.