192results about "Elemental selenium/tellurium" patented technology

The invention provides a preparation method and application of red nano-selenium particles, and relates to the technical field of nano-medicines.The preparation method comprises the steps that sodium selenite is dissolved in ultrapure water, silicate microspheres containing copper, zinc and aluminum are added, the pH value is 4.8, 1.5 M of ascorbic acid solution is dropwise added while stirring, the temperature is increased till solid ascorbic acid is added, the pH value is adjusted through NaOH, and nano-selenium suspension liquid is obtained through stirring reaction; the preparation method comprises the following steps: mixing and stirring a nano-selenium suspension, a sodium alginate sulfydryl graphene oxide mixture and a chitosan oligosaccharide citric acid buffer solution, centrifugally washing, and freeze-drying to obtain red nano-selenium particles, and preparing the copper-zinc-containing aluminosilicate microspheres through mesoporous template calcination and copper-zinc co-doping. The red nano-selenium particles prepared by the method have a core-shell structure, uniform particle size, high oxidation resistance and remarkable interface bonding strength.

The invention discloses a method for cascade recovery of tellurium from a complex tellurium-containing material. The method comprises the steps of acid pickling, reduction neutralization, pyrogenic transformation, leaching and neutralization. According to the method, through cooperative treatment of a wet process and a pyrogenic process, the problem of slag phase wrapping is effectively solved, and tellurium with different valence states in a complex tellurium-containing material is converted into high-quality tellurium neutralization slag in a gradient mode. The selenium removal rate is not lower than 95%, the tellurium recovery rate reaches up to 90% or above, efficient separation of selenium and tellurium is achieved, and the produced tellurium dioxide neutralization slag can be used for further purification and refining.

The invention provides an iron-selenium double-monatomic nitrogen-doped carbon-based composite material and a preparation method and application thereof, the composite material comprises an N-doped carbon matrix, and Fe monatomic and Se monatomic distributed on the N-doped carbon matrix, and the Fe monatomic and the Se monatomic are anchored on the N-doped carbon matrix. The method comprises the following steps: preparing a Fe / Se / N-doped carbon-based precursor, and carrying out high-temperature carbonization on the Fe / Se / N-doped carbon-based precursor to obtain the iron-selenium double-monatomic nitrogen-doped carbon-based composite material. The preparation method overcomes the technical bottlenecks of low specific capacity, poor cycling stability, poor rate capability, complex preparation process, no environmental protection and the like of the existing sodium-ion battery negative electrode material. The composite material has high reversible capacity, excellent cycle stability and good rate capability, comprehensively improves the comprehensive electrochemical performance of the sodium-ion battery, provides a competitive high-performance material solution for the field of sodium-ion batteries, and practically meets the urgent demand of the current new energy field on high-performance battery materials.

The invention relates to a method for recovering tellurium from copper anode slime through cooperation of ultrasound and hydrogen peroxide, and belongs to the field of wet metallurgy of scattered metal. The method comprises the following steps: drying and grinding copper anode slime to obtain copper anode slime powder; the method comprises the following steps: adding copper anode slime powder into a sulfuric acid solution, mixing to obtain copper anode slime slurry, adding hydrogen peroxide into the copper anode slime slurry, carrying out ultrasonic enhanced leaching for 20-160min, and carrying out solid-liquid separation to obtain a leaching solution containing copper and tellurium and high-grade valuable metal leaching residues. According to the method, hydrogen peroxide is effectively promoted to be decomposed by ultrasound to generate hydroxyl radicals, the oxidation potential of a system is regulated and controlled, copper and tellurium are selectively converted into copper ions, tellurate radicals enter a solution, and valuable elements such as gold, silver and selenium are enriched in slag; necessary heat is provided for the reaction by utilizing the heat effect of ultrasonic and heat released by chemical reaction, and extra heating is not needed; strong jet flow generated by ultrasound effectively destroys raw material inclusion and secondary wrapping, reaction mass transfer is enhanced, and the leaching rate of tellurium is increased. The method disclosed by the invention is simple in leaching process operation, low in cost and high in reaction speed.

The invention discloses a method for separating and recovering selenium and mercury from acid mud containing selenium and mercury. The method comprises the following steps: mixing the acid mud containing selenium and mercury with water, performing wet ball milling, filtering and drying to obtain a ball milling material; adding a hydrogen peroxide solution into the ball-milled material, adding hydrochloric acid to adjust the acidity, carrying out oxidation acid leaching, and carrying out solid-liquid separation to obtain selenium-containing mercury liquid and selenium-removed mercury slag; adding thiourea into the selenium-containing mercury liquid for selective reduction, and performing solid-liquid separation to obtain crude selenium and reduction liquid; zinc powder is added into the reduction liquid for mercury replacement and precipitation, and crude mercury and precipitation liquid are obtained after solid-liquid separation; wherein the selenium-removed mercury slag and the precipitation solution are subjected to centralized treatment. The method is simple in process, convenient to operate and easy to process, selenium and mercury in the acid mud containing selenium and mercury can be removed at a time, efficient separation and recovery of selenium and mercury in the acid mud containing selenium and mercury are achieved, harmless treatment of hazardous waste and effective utilization of resources are achieved, and the method conforms to the concept of green sustainable development.

The invention discloses a method for recovering selenium and mercury from acid-making acid mud, and relates to the field of non-ferrous metal metallurgy. The method comprises the following steps: slurrying acid mud produced in a purification process in a sulfuric acid production process and concentrated sulfuric acid, roasting at low temperature to realize preliminary separation of mercury and selenium, distilling roasting residues to realize recovery of mercury in the acid mud, and returning distillation residues to a lead system to recover lead in the acid mud. The method can realize efficient separation of mercury and selenium in acid-making acid mud, has the characteristics of echelon recovery of selenium, mercury and lead, environmental friendliness and the like, is simple to operate, and has good economic benefits.

The invention relates to a method for preparing small-particle-size red nano-selenium particles and application of the small-particle-size red nano-selenium particles, and belongs to the technical field of selenium compounds. The nano-selenium particles contain nano-selenium and a lipoic acid oligomer. The preparation method comprises the following steps: respectively preparing nano-selenium and a lipoic acid oligomer, and uniformly mixing the nano-selenium and the lipoic acid oligomer to obtain the nano-selenium particles. The nano-selenium particles have good stability; the content of total protein and fat in highland barley grains to which the nano-selenium particles are applied is remarkably increased through detection, the nano-selenium particles become an effective means for selenium enrichment of crops, the nano-selenium particles are well applied to selenium-enriched planting of highland barley, and the application of the nano-selenium particles to the highland barley grains is developed by combining development of new selenium-enriched crop varieties and research of a new selenium fertilizer application technology. And a powerful promotion effect is achieved on the development of selenium-enriched ecological agriculture.

The invention discloses a method for recovering valuable metals from copper anode slime step by step, and belongs to the technical field of metallurgy and chemical industry. According to the method, through control over the oxidation-reduction potential, the oxidation-reduction potential is high in the leaching stage, and it is guaranteed that gold, selenium, tellurium and the like can be oxidized to enter a leaching solution; in the reduction stage, gold, selenium and tellurium products are reduced step by step according to the difference of gold, selenium and tellurium in reduction potentials; in the leaching stage, soluble chlorine salt is added while enough oxidation potential is guaranteed, enough chloride ions are provided for the solution, and therefore gold can enter the solution in the form of AuCl4-(tetrachloroauric acid); meanwhile, in the oxidation leaching stage, a small amount of silver enters the solution in the form of silver sulfate or silver complex, and under the condition that enough chloride ions are provided, silver is precipitated and retained in residues in the form of silver chloride, so that separation of gold and silver is achieved, and meanwhile dispersion of gold and silver in the leaching process is reduced. According to the method, valuable metal is efficiently separated and recycled.

A hydrometallurgical process for recovering a plurality of metals from a complex rare and precious material, comprising the following steps: step 1: adding a complex rare and precious material to a hydrochloric acid solution, adding an oxidant for reaction, and then performing filtration to obtain a chlorination liquid and a chlorination residue; step 2: using two-stage counter-current gold loading to obtain a gold-loaded liquid and a post-loading liquid, reducing the gold-loaded liquid, performing clarification to obtain an organic phase, and filtering a precipitate to separate a post-reduction liquid and sponge gold; performing evaporation and concentration on the post-reduction liquid to produce a concentrate 1 and a condensate; and cooling and crystallizing the concentrate, performing filtration to obtain residual oxalic acid, and returning the residual oxalic acid to the reduction process and a post-crystallization liquid to gold loading; step 3: performing low-temperature distillation on the post-loading liquid to obtain a concentrate 2; step 4: performing high-temperature distillation on the concentrate 2 to obtain a concentrate 3; step 5: performing directional crystallization and centrifugal filtration on the concentrate 3 to obtain a crystallization residue and selenous acid; and step 6: washing the crystallization residue by using cold water or a low-acid-level condensate produced in step 3, and performing filtration to obtain a tellurium residue and a palladium-platinum-rhodium-rich liquid.

The invention belongs to the field of nanometer materials, and particularly discloses an ultrathin platinum-based hollow nanorod with the wall thickness smaller than 4 nm and a preparation method and application of the ultrathin platinum-based hollow nanorod. The preparation method comprises the following steps: adding a tellurium precursor and a selenium precursor into a solution containing a reducing agent, continuously magnetically stirring, and then carrying out solid-liquid separation to obtain the tellurium-selenium nanorod, then adding a hydrogen peroxide solution into an aqueous solution containing an intermediate product, carrying out a reaction for a preset time, carrying out solid-liquid separation after the reaction is finished so as to obtain a precipitate, and finally, preparing the ultrathin platinum alloy hollow nanorod. If other noble metal precursors are not added when the platinum precursor is added, the ultrathin platinum hollow nanorod can be obtained. The reaction rate of the noble metal precursor and the tellurium-selenium template is controlled mainly through ethylene glycol and polyvinylpyrrolidone, and the unreacted tellurium-selenium template is removed through hydrogen peroxide etching, so that the prepared ultrathin platinum-based hollow nanorod has the wall thickness smaller than 4 nm.

The invention relates to the technical field of non-ferrous metal smelting, and discloses a combined treatment method of copper anode slime and lead anode slime, which comprises the following steps: step 1, pretreatment: mixing the copper anode slime and the lead anode slime, and then sequentially carrying out ball-milling crushing and water-washing desalination, the ball-to-material ratio of the ball-milling crushing is 4: 1-6: 1, and the particle size D50 of the crushed material is 8-25 [mu] m; the pretreated raw materials and a leaching agent are mixed and react for 1.5-3 h at the temperature of 60-75 DEG C under ultrasonic field and constant potential control, the potential range of constant potential control is 0.90-1.10 V, and the leaching agent comprises, by mass, 35-45 parts of thiourea, 8-12 parts of sodium chloride, 4-6 parts of ammonium persulfate, 3-5 parts of citric acid and 12-18 parts of sulfuric acid. By adopting the technical scheme of the synergistic effect of electrochemical potential gradient regulation and control and a complexing competitive mechanism, the defect that the leaching rate of precious metal is insufficient due to overlapping of oxidation-reduction potentials is overcome.

The invention discloses a purification method of high-purity tellurium, and belongs to the technical field of non-ferrous metallurgy. The method sequentially comprises the steps of raw material ultrasonic mechanical activation, ultrasonic selective recrystallization, smelting reduction refining, vacuum rectification purification and tellurium ingot forming, and volatile impurities such as selenium and sulfur are effectively removed by oxidizing calcination of a crude tellurium raw material; then, primary separation of impurities is realized in a manner of combining alkaline dissolution and oxidation precipitation, and then repeated purification is performed through low-temperature crystallization, so that the purity of tellurium is remarkably improved; metal impurities are further removed through smelting reduction treatment under the inert atmosphere, and preliminarily purified tellurium ingots are formed; step distillation separation is carried out by utilizing vapor pressure difference between tellurium and impurities under a high vacuum condition, and a pure tellurium component is enriched; and finally, melting in an inert atmosphere, cooling and forming to obtain the high-purity tellurium ingot. The method is stable in technological process, suitable for industrial application and capable of meeting the requirements of high-end fields such as semiconductors and photoelectric materials for high-purity tellurium materials.

The invention discloses a tellurium copper slag comprehensive treatment technology and a multi-element collaborative recovery method, and relates to the technical field of non-ferrous metal metallurgy and solid waste recycling, and the tellurium copper slag comprehensive treatment technology comprises the following steps: pretreatment and arsenic volatilization removal, selective acid leaching copper extraction, tellurium enrichment through alkaline oxidation, tellurium reduction and arsenic recycling. According to the method, by combining the advantages of a wet process and a pyrogenic process, the defects that in the prior art, arsenic cannot be effectively recycled in the tellurium-copper slag treatment process and the process is complex are overcome, efficient copper and tellurium separation is achieved through coordinated regulation and control of an acid / alkali medium and an oxidizing agent, arsenic is recycled in an industrial raw material form, and the limitation that only tellurium and copper are concerned in a traditional process is broken through.

The present application relates to the technical field of anode slime treatment, and discloses a method for removing antimony and tellurium from anode slime by multi-stage pressurization and chlorine-free process, which comprises the following steps: S1, anode slime pretreatment, S2, multi-stage pressurization treatment, S3, separation of antimony and tellurium from the anode slime, S4, preparation of sodium antimonate, S5, tail gas treatment, S6, waste liquid treatment, S7, post-treatment. The method is characterized by the following: one-stage pressurized thiourea transformation is used for deep copper removal, and two-stage pressurized sulfuration is used for chlorine-free antimony and tellurium removal. The process flow does not involve chlorine-containing substances, and the pressurized leaching of alkaline medium does not produce substances with strong corrosivity, thereby reducing the damage to the equipment. In the process of removing antimony and tellurium, the harmful substances generated during the reaction can be treated by waste gas and waste liquid treatment, and the by-products, precipitates, incompletely removed heavy metal ions, trace pollutants and the like in the tail liquid can be removed or converted into harmless substances, so that the tail liquid meets the discharge standard and the environmental pollution caused by the tail liquid discharge is reduced.

The application provides a method for separating selenium tellurium from high-selenium tellurium dioxide through multistage conversion, and belongs to the technical field of non-ferrous metallurgy. The method comprises the following steps: a, material preparation; b, primary conversion leaching: selectively reducing selenium in a solution containing a reducing agent at pH 8-11 to obtain a selenium tellurium-containing residue and a primary leaching solution; c, secondary conversion leaching: selectively leaching tellurium in a strong alkaline solution containing a reducing agent to obtain elemental selenium and a secondary leaching solution; and d, neutralization treatment: combining the two leaching solutions and adding acid to obtain high-purity tellurium dioxide. The method is simple to operate, short in production cycle, and realizes efficient separation of selenium tellurium. The purity of the obtained elemental selenium is greater than or equal to 95%, the purity of the obtained tellurium dioxide meets the requirements of electrodeposition for producing 4N tellurium, and the method is suitable for large-scale production.

The invention relates to the technical field of purification, in particular to vacuum distillation zone smelting purification equipment for deeply removing high-purity tellurium impurities and a production process. The vacuum distillation zone smelting purification equipment comprises a purification tank cover and a purification tank body; a movable bracket is arranged in the purification tank body; an induction line group is fixedly mounted on the movable bracket; a raw material cylinder is arranged in the purification tank body; a clamping mechanism and a turnover mechanism are arranged on the mounting plate; the clamping mechanism can clamp the raw material barrel; a reciprocating heating mechanism is arranged in the purification tank body and can drive the movable bracket to do reciprocating translation so as to drive the induction line group to move along the length direction of the raw material barrel; when the induction line group moves to the tail end of the stroke, the turnover mechanism can drive the turnover raw material barrel; through mutual cooperation of the reciprocating heating mechanism and the turnover mechanism, the process of heating mineral aggregate by the induction line group is relatively continuous (the interval time is short), impurities are gathered on one side of the raw material cylinder, and the product loss can be effectively reduced, so that the purification efficiency is indirectly improved.

The utility model relates to the field of tellurium production of tellurium-zinc-cadmium purification, in particular to a distillation preposed preheating device for tellurium purification of tellurium-zinc-cadmium, which comprises a box body and a heating device, the box body comprises a front side plate, a rear side plate, a bottom plate and a top plate, a feed port is arranged on the front side plate, a discharge port is arranged on the rear side plate, and the heating device is arranged on the bottom plate. The bottom plate is provided with an S-shaped rail groove communicated with the feeding port and the discharging port, a first partition plate and a second partition plate are arranged in the box body and divide the interior of the box body into a first cavity, a second cavity and a third cavity, the heating device comprises a hot chamber, a burner, a draught fan and an air outlet pipe, the burner is communicated with the interior of the hot chamber, and the draught fan is communicated with the interior of the hot chamber. The air outlet pipe comprises a main pipe, a first branch pipe and a second branch pipe, the first branch pipe and the second branch pipe are communicated with the main pipe, the first branch pipe is communicated with the right side end of the first cavity, the second branch pipe is communicated with the left side end of the second cavity, the second branch pipe is connected with a third branch pipe, and the third branch pipe is communicated with the upper end of the third cavity. And the discharge port is rotationally connected with a second baffle plate.

The invention discloses a high platinum group metal copper anode slime treatment method which comprises the following steps: placing high platinum group metal copper anode slime in dilute sulphuric acid, blowing air, heating, oxidizing and leaching copper and nickel in the high platinum group metal copper anode slime, and carrying out solid-liquid separation to obtain a first filtrate and a first filter cake; dispersing the first filter cake in dilute sulfuric acid, carrying out heating and pressurizing reaction in an oxygen atmosphere, dissolving out part of metal in the first filter cake, carrying out solid-liquid separation to obtain a second filtrate and a second filter cake, mixing the second filter cake, calcium oxide and coke powder, pressing into blocks, smelting at 1450-1550 DEG C for a set time, atomizing the smelted alloy to obtain fine particles, and recycling the fine particles. Gold-platinum-palladium alloy powder is obtained; and after the second filtrate is subjected to flash evaporation and rapid cooling, ferrous sulfate is added into the second filtrate for palladium precipitation, the filtrate obtained through filtering is sequentially subjected to the steps of silver precipitation and selenium and tellurium precipitation, thiourea is added into the remaining filtrate, a reaction is conducted at high temperature and high pressure, thiourea complex precipitation is generated, solid-liquid separation is conducted, third filtrate and a third filter cake are obtained, and platinum family concentrate is obtained.

According to the red nano-selenium and the preparation method thereof, sodium selenite is used as a selenium source, and ascorbic acid is used as a reducing agent. The reaction medium is impacted by mechanical force in the high-speed crusher and refined, so that the surface area is increased, the reaction is accelerated to achieve a nano effect, and a red nano-selenium mixture is formed. The molar ratio of sodium selenite to ascorbic acid serving as reaction media is increased, the particle size of the nano-selenium is controlled to be 10-50nm, the agglomeration phenomenon of the nano-selenium is reduced, and the stability of the nano-selenium is improved. Ascorbic acid is used as a reducing agent to completely replace traditional toxic reagents such as hydrazine hydrate and thiourea, so that harmful substance residues are avoided. The product can be directly applied without washing, and agglomeration of the nano-selenium material in washing and drying is avoided. Solid-phase mechanochemical reduction is achieved through high-speed smashing equipment, and the strict dependence of a traditional liquid phase on the temperature and the pH value is broken through. The preparation method is low in investment, simple to operate, free of emission of three wastes and suitable for small-batch and industrial production.

The invention discloses a method for preparing copper and tellurium by reducing copper tellurite slag through rice, and belongs to the field of metallurgical energy conservation and emission reduction and comprehensive utilization. The method provided by the invention comprises the following steps: washing, chopping and air-drying rice straws; fully mixing the treated crushed rice straw with the copper tellurite slag by using a ball mill; putting the mixed substances into a hydraulic tablet press, and pressing the mixed disintegrating slag into balls; carrying out two-stage vacuum pyrolysis reaction on the pretreated spherical mixture, wherein the first-stage reaction temperature is 350-500 DEG C; the reaction temperature of the second stage is 800-900 DEG C; and preparing to obtain metal copper and metal tellurium. The method overcomes the bottlenecks of pollution gas generation, pollution waste acid water generation, strong acid addition, long flow, complex process and the like in the traditional separation means of copper and tellurium in copper tellurite, realizes the separation of copper and tellurium in industrial grade copper tellurite compared with the traditional pyrolysis mode, and has the characteristics of environmental friendliness, low cost, stable product quality, easy realization of industrialization, and the like. And the like.

The application relates to an ultrasonic treatment method of high-impurity copper anode slime. The ultrasonic treatment method is realized through hierarchical ultrasonic strengthening and synergistic leaching. In the first-stage leaching, hydrogen peroxide-oxygen-rich air composite oxidants are combined with ultrasonic cavitation effects to realize efficient oxidation leaching of arsenic, antimony and bismuth; in the second-stage leaching, sulfuric acid-sodium sulfite mixed leaching agents are used to remove harmful impurities such as arsenic, antimony and bismuth under ultrasonic strengthening, and to efficiently enrich valuable metals such as gold, silver, selenium and tellurium, so that the treatment period is shortened, energy consumption and reagent consumption are reduced, resource comprehensive utilization is improved, and the method is suitable for efficient separation and resource recovery of high-impurity copper anode slime containing refractory impurities such as arsenic, antimony and bismuth and valuable metals such as gold, silver, selenium and tellurium.

A production device and method for preparing 6N high-purity tellurium by horizontal vacuum distillation. The production device includes a horizontal tube; a first heater, a second heater, and a heat-insulating cover are provided outside the horizontal tube, corresponding to a first heating zone, a second heating zone, and a heat-insulating zone, respectively; a graphite sleeve, a first-stage condenser, and a second-stage condenser are provided in sequence inside the horizontal tube; a graphite boat is located in the first heating zone; and a tellurium material is loaded in the graphite boat. The present invention also includes a production method. The present invention achieves efficient separation of metallic tellurium from low-boiling impurities and high-boiling impurity elements, thereby achieving the preparation of 6N high-purity tellurium; the use of horizontal vacuum distillation to prepare high-purity tellurium has a driving force that is less affected by gravity, weakening the influence of the gravitational field, resulting in a short process and high impurity removal efficiency; the test process is convenient for loading and removing samples, and the operation is easy.

The present application belongs to the field of metallurgy, and relates to a method for producing antimony white by directly oxidizing crude antimony, comprising the following steps: S1, mixing crude antimony with crude antimony alloy, and reacting under an oxygen-containing atmosphere, to obtain oxidized slag and a melt after the reaction is completed; S2, adjusting the temperature of the melt, and then introducing compressed air to react, to produce antimony trioxide-containing flue gas, and to obtain antimony oxide slag after the reaction is completed. The present application makes full use of impurities such as sodium sulfide, sodium hydroxide and sodium thiosulfate contained in crude antimony, and innovatively uses these components for arsenic removal reaction, which not only avoids the cumbersome steps of adding various auxiliary materials in the traditional process, but also enables the original sodium sulfide, sodium hydroxide and sodium thiosulfate in the crude antimony to fully play a synergistic role, showing excellent performance in arsenic removal effect, thus simplifying the process flow, significantly reducing the production cost, and realizing the dual improvement of economic benefit and process efficiency.

This invention relates to the field of electrocatalysis technology, specifically to a single-element selenium-nickel-iron alloy composite electrocatalyst, its preparation method, and its application. Using nickel chloride, ferrous sulfate, urea, ammonium fluoride, and selenium dioxide as precursors, a two-step hydrothermal method is employed. In the first step, a nickel-iron alloy is prepared in situ on a foamed iron substrate using nickel chloride, ferrous sulfate, urea, and ammonium fluoride precursors. In the second step, selenium dioxide is used as a selenium source to composite elemental selenium with the nickel-iron alloy, resulting in the in-situ growth of a single-element selenium-nickel-iron alloy block catalyst on a foamed iron substrate. The electrocatalyst of this invention exhibits excellent catalytic activity and stability in the electrocatalytic water desorption oxygen reaction, meeting the requirements for large-scale industrial applications.

The invention provides a preparation method of selenium nanoparticles based on polyvinylpyrrolidone modification, which comprises the following steps: S1, reduction reaction: under the protection of inert gas, carrying out reduction reaction on a selenium source and sodium borohydride in an aqueous solution at room temperature to generate a sodium hydrogen selenide intermediate; s2, stabilizing reaction: adding a polyvinylpyrrolidone aqueous solution into the reaction system obtained in the step S1, and continuing to carry out stabilizing reaction under the protection of inert gas, so that polyvinylpyrrolidone is modified on the surfaces of the generated selenium nanoparticles; s3, purification and collection: purifying the reaction liquid obtained in the step S2, removing small molecular impurities, and then freeze-drying to obtain selenium nanoparticle solid powder based on polyvinylpyrrolidone modification. The preparation method of the selenium nanoparticles based on polyvinylpyrrolidone modification, provided by the invention, has the advantages of safer raw materials, simpler process, purer product and the like.

The utility model relates to a superfine selenium powder preparation device which comprises a gasification furnace, a connecting pipeline I is communicated with the gasification furnace, the other end of the connecting pipeline I is communicated with a vapor deposition furnace, a smoke exhaust port is formed in the top of the vapor deposition furnace, a discharge port is formed in the bottom of the vapor deposition furnace, and the superfine selenium powder preparation device further comprises a side blowing guide pipe. And a side blowing guide pipe is arranged beside the connecting pipeline I on the vapor deposition furnace. The device is simple in structure, low in cost and easy and convenient to operate, selenium steam is sufficiently and uniformly quenched by nitrogen, selenium powder products with consistent crystal granularity are obtained, the granularity of the prepared selenium powder can be applied to the high-end fields of photoelectricity, chemical medicine and the like, and uncrystallized selenium steam and impurities can be effectively recycled.

To provide a method for recovering selenium from an acidic aqueous solution containing selenous acid and ruthenium by suitably suppressing the incorporation of ruthenium in the precipitation recovery of selenium.SOLUTION: A method for recovering selenium comprises adding dimethyl sulfoxide to an acidic aqueous solution containing selenous acid and ruthenium, heating the acidic aqueous solution to a liquid temperature of 65°C or higher, adding a reducing agent to precipitate selenium, stopping the reduction, and then recovering the precipitated selenium.SELECTED DRAWING: None

A positive electrode material is disclosed, represented by the formula LiaNixCoyMn1-x-yMbO2-cQc, where 0.2≤a≤1.2, x≥0.6, y>0, b>0, and c>0. M comprises a high-valence cation and Q comprises an anion. The doping of a high-valence cation and an anion in a nickel-rich ternary material stabilizes the bulk structure during lithium deintercalation, reduces side reactions, lattice oxygen release, and transition metal dissolution, and improves cycling stability, high-temperature storage, and rate capability. The outer surface of the positive electrode material may further include a selenium-containing coating layer that reacts with residual lithium compounds and binds released lattice oxygen to suppress electrolyte oxidation. A conductive coating layer may be formed on the selenium-containing layer to prevent direct contact with the electrolyte and inhibit side reactions.

The invention discloses a method for separating inorganic selenium from a selenoprotein primary product. The technical problem of separating inorganic selenium from the existing selenoprotein primary product is solved, the selenoprotein is purer, the organic selenium content (99.99%) is higher, the biological activity and effectiveness of selenium are improved, absorption and utilization of life bodies are facilitated, and the side effects of the selenium are reduced. Based on the characteristics that inorganic selenium is larger than organic selenium in density and higher in electric conductivity, the technical scheme of combining a precipitation method, an ultrafiltration method, a reverse osmosis method and a dialysis method is adopted, the inorganic selenium existing in selenoprotein is separated out, and a purer selenoprotein product is obtained. After selenium protein powder, selenium yeast powder, selenium mushroom powder, selenium algae powder and other organic selenium primary products are separated through the process steps, high-purity (95%-99.99%) selenium protein, inorganic selenium and purified water are obtained. Environmental protection requirements are considered preferentially, zero emission is achieved in the separation process, and the method is extremely environment-friendly. The selenium protein is pure, selenium supplementation is not limited any more, and selenium supplementation popularization becomes possible.

The present invention provides a SnO2 / Se nanocomposite material, a preparation method, and an application thereof. The SnO2 / Se nanocomposite material comprises Se nanowires and SnO2 nanosheets, wherein the SnO2 nanosheets are dispersed between the Se nanowires and / or supported on the Se nanowires. The SnO2 / Se nanocomposite material is obtained by allowing ultrathin SnSe nanosheets obtained by liquid exfoliation to stand in an aqueous solution to undergo self-transformation. The preparation process is stable and controllable and can be controlled by adjusting the size of the SnSe nanosheets, the standing time, the standing temperature, and the alkalinity of the aqueous solution. The resulting SnO2 / Se nanocomposite material is applied to photodetectors and exhibits excellent light response performance. The resulting SnO2 / Se nanocomposite material can also be used in fields such as gas sensors, energy storage devices, and mode-locked lasers.