82results about "Selenium/tellurium oxides/hydroxides" patented technology

The invention discloses a novel high-impurity copper anode mud treatment technology. The novel high-impurity copper anode mud treatment technology includes the following steps that firstly, copper anode mud is subjected to sulphating roasting and selenium removing, and copper is leached and removed; secondly, a side-blown converter is used for reduction smelting, wherein a slagging agent and a reducing agent are added to the copper anode mud obtained after sulphating roasting and selenium removing and copper removing, even mixing is conducted, a mixed material is obtained and subjected to melting, slagging and a reduction reaction, and smoke, dross on the upper layer and melt-shaped noble lead on the lower layer are formed; thirdly, vacuum distillation is conducted; and fourthly, gold and silver electrolysis and lead and bismuth recovery are conducted, wherein a Dore alloy is put into an intermediate-frequency furnace to be cast into a silver anode plate for silver electrolysis, and lead electrolysis is conducted after a lead and bismuth alloy is cast into a lead plate. The novel high-impurity copper anode mud treatment technology has the beneficial effects that reaction smelting and vacuum distillation are conducted through the side-blown converter, precious metal and valuable metal are recovered to the maximum degree, and the amount of precious metal left in the technology is reduced to the minimum.

The invention relates to a device and a method for removing impurities in mercury-containing crude selenium. The device comprises an oxidizing furnace, a crystallizer, a separator, a spraying tower, afilter, an ion exchange column and a reduction tank, wherein an oxygen gas conveying device and a temperature measuring device are arranged at the top part of the oxidizing furnace; an air outlet atthe upper part of the oxidizing furnace is connected with an air inlet at the upper part of the crystallizer; an air outlet at the upper part of the crystallizer is connected with an air inlet at theupper part of the separator; the lower part of the crystallizer is provided with a material outlet; an air outlet of the separator is connected with an air inlet at the lower part of the spraying tower through a water sealing device and an induced draft fan; a water tank at the bottom part of the spraying tower is connected with the top part of the spraying tower through a spraying pump; a water outlet of the water tank is connected with the filter; the filter is connected with an inlet at the lower part of the ion exchange column; an outlet at the upper part of the ion exchange column is connected with the reduction tank. The invention also discloses the method for removing the impurities in the mercury-containing crude selenium. The device and the method have the advantages that the device and the method are simple, the selenium separating effect is good, the cost is low, and the device and the method are suitable for industrialized production.

The invention discloses a high-purity tellurium dioxide preparation method and device. The method includes the steps: a, oxidizing reaction: oxidizing 4N tellurium powder by hydrogen peroxide, accurately controlling the adding quantity and the adding rate of the hydrogen peroxide by a flow pump and controlling the concentration of the hydrogen peroxide to range from 10% to 25%; b, purification: adding 2g/L of purifying agents into solution obtained after oxidizing reaction, stirring the solution and then standing for 20-30 minutes; c, concentration and crystallization: distilling and crystallizing the purified and settled solution at high temperature; d, high-temperature cracking: cracking crystals at high temperature to obtain high-purity tellurium dioxide. The usage and the concentration of the hydrogen peroxide are accurately controlled, so that peroxidation is avoided, the purity of products is ensured, and production efficiency and product yield are effectively improved.

The invention provides a tellurium copper slag treatment method which includes the steps of S1, subjecting tellurium copper slag to acidic oxidation and leaching through acid solution and oxidizing agent to obtain acid leachate; S2, subjecting the acid leachate to solid-liquid separation to obtain liquid phase, regulating pH value of the liquid phase to be 12-14 with sodium hydroxide, raising temperature until the liquid is boiled to complete reaction to obtain alkaline transfer solution; S3, subjecting the alkaline transfer solution to acidic hydrolysis to obtain a tellurium dioxide product.The acid solution refers to hydrochloric acid solution or sulfuric acid solution. According to the technical scheme, copper, selenium and tellurium are separated by steps, excellent separation effectis achieved, and recovery rate of valuable elements such as tellurium is high. The whole treatment process is simple, stable and reliable, is adaptable to large-scale industrial application, and achieves good economic benefit. Besides, general hydrometallurgical equipment can be utilized as production equipment, and acidic oxidation and leaching and alkaline transfer can be completed through the equipment only, and thus, equipment investment can be saved.

The invention relates to a method for recovering tellurium and cadmium from cadmium telluride wastes. The method comprises the following steps: S1: breaking the cadmium telluride wastes, sieving the broken cadmium telluride wastes and then mixing the powder with water uniformly, thus forming first mixed liquor; S2: adding acid to the first mixed liquor to react for a period of time and then adding an oxidant to form second mixed liquor; S3: filtering the second mixed liquor, thus obtaining a first solution and a tellurium dioxide precipitate; S4: adding Cl<-> to the first solution, then adding sodium sulfite for reduction purification and carrying out filtration, thus obtaining a crude tellurium precipitate and a second solution; S5: then adding sulfides to the second solution and carrying out filtration, thus obtaining a cadmium sulfide precipitate. The method has the beneficial effects that separation and recovery of tellurium and cadmium are achieved by controlling the oxidation potential in the cadmium telluride waste leaching process; the purity of finally obtained tellurium dioxide and cadmium sulfide can reach 2-3N; the method is simple in process, is safe to operate and is low in cost and high in recovery rate.

The invention provides a process for preparing tellurium dioxide. The process comprises the following steps: (A) enabling tellurium copper slag to be pulpified and then adding mixed acid to react to obtain pre-leaching slurry; (B) enabling the pre-leaching slurry to react with an oxidizing agent and then adjusting the pH value to 2-4 to obtain high-copper liquid and tellurium-rich slag; (C) enabling the tellurium-rich slag to be pulpified and then react with a transformation agent and an impurity-removing agent to obtain transformation slurry; and enabling the transformation slurry to react with alkali to obtain tellurium-separated tailings and tellurium leach liquor; and (D) hydrolyzing the tellurium leach liquor to obtain the tellurium dioxide. The invention firstly provides the steps of pre-leaching to remove copper through controlling a weak acid environment, then oxidizing self-precipitated tellurium, separating the tellurium from the copper effectively and then removing impurities and transformed high-valence tellurium through adding the transformation agent and the impurity-removal agent before alkali leaching, the steps of the process realize multiple functions in a short condition and are easy to control, so that the leaching rate is high, the impurity-removing effect is good, and the recovery rate of the copper and the tellurium is high.

The invention relates to a comprehensive utilization method for recycling industrial hazardous wastes. The method is characterized in that copper-containing hazardous wastes, lead-containing hazardouswastes and nonferrous metallurgical hazardous wastes are mixed and prepared into furnace charge, the furnace charge is added with additives such as iron, silicon, and calcium to be subjected to briquetting, and then copper matte and a lead-bismuth alloy are prepared through reduction smelting in a shaft furnace; electrolytic lead is prepared through copper removal and tin removal of the lead-bismuth alloy through electrolysis, and coarse bismuth is prepared by smelting electrolytic anode mud through a converter, specifically, in the process of preparing refined bismuth by pyrorefining, gold,silver, antimony and tellurium are recovered in the form of slag and smoke dust; and the electrolytic lead obtained by electrolysis is smelted by a pyrometallurgical method to obtain an electrolytic lead ingot. According to the method, comprehensive utilization of valuable metals in the copper-containing hazardous wastes, the lead-containing hazardous wastes and the nonferrous metallurgical hazardous wastes, wastewater zero discharge in the process and standard discharge of tail gas in the smelting process are achieved, and the method is a novel environment-friendly resource-oriented process.

The invention provides a method for treating tellurium-containing waste liquor. The method comprises the following steps: S1, the tellurium-containing waste liquor is concentrated and crystallized forobtaining copper sulfate and crystallization mother liquor respectively, and the tellurium-containing waste liquor contains elements of tellurium and copper and sulfuric acid; S2, the crystallizationmother liquor is reduced with a reducing agent, and tellurium-copper slag and reduced liquor are obtained respectively; S3, an acid solution and an oxidant are adopted for acid oxidation leaching onthe tellurium-copper slag, an acid leaching solution is obtained, and the acid solution is a hydrochloric acid solution or a sulfuric acid solution; S4, the acid leaching solution is subjected to solid-liquid separation, a liquid phase is taken, pH is adjusted with sodium hydroxide to 12-14, heating is performed to a boiling state for reaction, and an alkaline conversion solution is obtained; S5,the alkaline conversion solution is subjected to acidic hydrolysis, and a tellurium dioxide product is obtained. Copper and tellurium are recovered step by step by the technical scheme, the separationeffect of copper and tellurium is good, the comprehensive recovery rate of copper and tellurium is high, the cost is low, and the economic benefit is increased.

The invention discloses a method for extracting tellurium dioxide from anode slime produced through tellurium electro-deposition. The method comprises the following steps that 1, the anode slime is put into a reaction kettle, water and sodium hydroxide are added, heating and mixing are performed for two hours, and filter pressing is performed to obtain filter residues, namely the tellurium dioxide; 2, the filter residues are put into the reaction kettle, water is added, a PH value is regulated to be 1.0-1.5 by using sulfuric acid, heating is performed to reach 85 DEG C, stirring is performed for two hours, and filter pressing is performed to obtain filtrate; 3, the filtrate is added into the reaction kettle, and iron powder is added and stirred for three hours; 4, sodium hydroxide is added after the solution is clarified and transparent, the PH value is regulated to be 7.0, then sodium hydroxide with the tellurium metal content 70% is added and stirred for an hour, filter pressing is performed to obtain a sodium tellurite solution, the PH value is regulated to be 5-5.5 by using sulfuric acid, and filter pressing is performed to obtain tellurium dioxide. In the step 3, the amount of the iron powder is determined according to the tellurium content in the filtrate and meets the requirements of a reaction equation: Te<6+> + Fe<0>= Te<4+> + Fe<2+>.

The invention discloses a mechanical grinding recovery method for cadmium telluride film solar cells. The method comprises two steps of stripping of photovoltaic film layers and dissolving recovery ofvaluable metal, wherein the step of stripping of the photovoltaic film layers comprises the following substeps: back plate glass and conductive poles of wasted cadmium telluride film solar cell modules are removed to obtain glass substrates with photovoltaic film layers; then, the photovoltaic film layers are mechanically grinded; the glass substrates are flushed by clear water after mechanical grinding; the flushing waste water is gathered for filtration to obtain filter slag; and the valuable metal is recovered from the filter slag. The method is high in recovery rate of the valuable metaland excellent in working environment, can recycle the back plate and substrate glass to achieve high comprehensive utilization rate, improves the material recovery rate and recovery effect of the cadmium telluride film solar cells, improves the resource utilization rate, and guarantees environmental protection in the whole process of a product chain.

The invention discloses a preparation method of high-purity tellurium dioxide powder. The method comprises the following steps: carrying out fine grinding on the raw material tellurium powder until the particle size is less than or equal to 150 mu m; nitric acid oxidization: adding 66-67% concentrated nitric acid into a reaction kettle, heating to 55-65 DEG C, adding the tellurium powder in the step (1), and stirring at the constant temperature of 70-80 DEG C for 2-3 hours until the reaction is complete; pH value regulation: after the temperature drops to at most 50 DEG C, adding aqua ammonia to accelerate precipitation, separating the supernate and the material precipitate, and washing the material with deionized water until the pH value of the washing solution is 7; and dewatering and calcination: drying for 2-3 hours while controlling the material temperature at 200 DEG C, and calcining for 3-3.5 hours while controlling the material temperature at 600-650 DEG C, thereby obtaining the high-purity tellurium dioxide powder. By performing the grinding and screening, the method solves the problems of complex steps, high consumption of chemical reagents, high energy consumption and lower efficiency in the prior art.

A method for recovering a metal from either an acidic or a basic solution using an aluminum cementation process is disclosed. The method involves adding an aluminum-containing powder to a tellurium-containing solution to precipitate tellurium from the tellurium-containing solution and then removing the precipitated tellurium therefrom.

The invention belongs to the field of preparation of thin films, and discloses a preparation method for a cubic-phase dicerium trioxide single-crystal thin film. According to the invention, dicerium trioxide has a structure of (Mn0.5Fe0.5)2O3, and a space group of 206. The method comprises the following steps: taking a single-crystal tungsten (110) substrate, and subjecting the surface of the single-crystal tungsten (110) substrate to cleaning treatment so as to obtain an atomic-scale flat surface; taking a cerium (Ce) evaporation source, and depositing cerium (Ce) on the surface of the treated single-crystal tungsten (110) substrate so as to obtain a cerium (Ce) single-crystal thin film with a thickness of 2 to 5 nanometers on the surface of the treated single-crystal tungsten (110) substrate; oxidizing the cerium (Ce) single-crystal thin film at a room temperature so as to obtain cerium dioxide (CeO2); and subjecting cerium dioxide (CeO2) to annealing treatment in a vacuum environment with an annealing temperature of 900 DEGC and an annealing time of 15 to 30 minutes so as to obtain the dicerium trioxide (Ce2O3) single-crystal thin film of a (001) plane. The cubic-phase dicerium trioxide (Ce2O3) single-crystal thin film of the (001) plane obtained by using the method provided by the invention is a supplement to a conventional catalytic model system.

The invention discloses a method for recovering selenium from high tellurium, silver and selenium slag through a short process. The method comprises the following steps that S1, the high tellurium, silver and selenium slag is placed in a vacuum distillation furnace, vacuum distillation is carried out under the conditions of 20 Pa-100 Pa and 300 DEG C-350 DEG C for 2 h-3 h, and coarse selenium andbottom slag containing silver, copper and selenium are produced; and S2, the coarse selenium obtained in the step S1 is placed in a selenium oxidizing furnace, a reaction is made under the conditionsthat the oxygen flow rate is 6 m<3>/h-10 m<3>/h and the temperature is 500 DEG C-570 DEG C for 3 h, and selenium dioxide and bottom slag containing tellurium are obtained. Through a vacuum distillation method, the selenium is separated from the silver, the tellurium and the copper simply, quickly and efficiently in an energy-saving manner, the selenium can be purified, and the selenium dioxide isfinally obtained.

The invention discloses a method for preparing nanometer TeO2 from aerosol through microwave assistance. The method comprises the following steps of A, dispersing precursors into a polar solvent to form a colloidal solution or true solution, i.e., a precursor solution, wherein the mass ratio of the precursors to the polar solvent is (0.01 to 10):(90 to 99.9); B, atomizing the precursor solution prepared in the step A to form aerosol liquid drips; C, dripping the aerosol liquid prepared in the step B into a microwave generator to perform microwave radiation; then, performing drying roasting toform nanometer powder particles. The preparation method of the spherical powder has the advantages that the production period is short; the operation is simple and convenient; no pollution is caused;the microcosmic structures of the obtained spherical powder cannot be easily damaged; the amplification can be easily realized; the method is suitable for being popularized and applied. A product canbe widely used in the fields of corrosion resistance, bacterium resistance, electronic component materials, emission spectrum analysis and the like.

There is provided a method for providing selenium dioxide and a copper indium gallium residue from a material comprising a compound of formula (I) CuIn_xGa_(1-x)Se₂ (I), wherein x has a value from 0.01 to 0.99, said method comprises the steps of: a) heating the material comprising the compound of formula (I) to at least 500° C., b) contacting the material with a gas flow comprising oxygen, and d) collecting the formed products. The method may be used in recycling in the field of solar cell technology.

The invention provides a copper removal treatment method for a waste material containing copper and selenium. The copper removal treatment method includes the following steps that S1, presoaking liquid is obtained by mixing the waste material containing the copper and the selenium, an iron-containing catalyst and dilute sulfuric acid; and S2, the presoaking liquid is subjected to high pressure leaching by using an oxidizing agent under the low temperature condition below 90 DEG C, then separation is carried out, and leaching slag containing silver and the selenium and leaching liquid containing the copper are obtained. According to the copper removal treatment method for the waste material containing the copper and the selenium, copper removal treatment is carried out on an industrial waste material, that is, a lead filter cake with the high copper and selenium content; according to the copper removal treatment method, the separation effect of precious metal such as the copper and theselenium is thorough, the cooper leaching effect is good, and the copper leaching rate is 96% or above; in addition, the selenium and other precious metal are all concentrated in the slag, the selenium, lead, gold and the silver can be recovered by entering a rare and expensive system, and the recovery rate of the precious metal is increased advantageously; and the overall process is stable and reliable, the copper removal treatment method for the waste material containing the copper and the selenium is suitable for large-scale industrial application, and the economic benefit is good.

The invention provides a cobalt-free positive electrode material, a preparation method and application thereof. The cobalt-free positive electrode material comprises a cobalt-free base material and a coating layer located on the surface of the cobalt-free base material, wherein the coating layer is a TeO2 coating layer, the mass of the TeO2 coating layer accounts for 0.1-0.8% of the mass of the base material, According to the invention, the TeO2 material is adopted to coat the cobalt-free high-nickel material, so that lithium ions can be embedded and emigrated in the material in the charging and discharging process, and the capacity and the first efficiency of the material are improved; and the coating layer reduces the contact area between the material and an electrolytic solution, and slows down the side reaction between the material and the electrolyte, so that the cycle performance of the material is improved, the oxygen loss of the material is slowed down, and the gas production is reduced so as to improve the high-temperature cycle performance and safety of the material.

The invention provides a method for preparing high-purity tellurium dioxide from crude tellurium as a raw material, the method effectively solves the problems of failure preparation or low purity of the high-purity tellurium dioxide due to reaction passivation and fast reaction rate reaction rate and the like in the prior art when a nitric acid method is used for preparing the high-purity tellurium dioxide from the crude tellurium as the raw material, and a high-purity tellurium dioxide product (>=5N) is prepared.

The invention discloses a comprehensive utilization method of an ammonia synthesis catalyst waste material. The comprehensive utilization method comprises following steps: the ammonia synthesis catalyst waste material is smashed into powder with a diameter of 100 to 300 micrometers; the powder is subjected to hydrochloric acid immersing, and filtering; filter residue is removed, excess zinc powder is added into an obtained filtrate, and an obtained mixture is stirred continuously; excess hydrochloric acid is added into the mixture, an obtained mixed material is subjected to filtering so as to obtain filter residue pure copper; and an obtained filtrate product is subjected to evaporation so as to obtain crystal substance zinc chloride. Recovery of copper and zinc after ammonia synthesis is realized via the comprehensive utilization method. The comprehensive utilization method is capable of realizing individual separation of valuable elements in ammonia synthesis such as copper and zinc, realizing further utilization of resources, and obtaining a large amount of signal valuable elements.