20 results about "Arsenate" patented technology

The invention discloses a polyamide acid-resistant nanofiltration membrane and arsenic removal application thereof in hair dye preparation. According to the amide acid-resistant nanofiltration membrane, a polyamine monomer and trimesoyl chloride are subjected to an interface reaction on an ultrafiltration supporting bottom membrane, and the polyamide acid-resistant nanofiltration membrane containing the Telogen structure is obtained. According to the method for removing the arsenic in the hydroxyethyl diphosphoric acid, a polyamide acid-resistant nanofiltration membrane containing a Troger structure is adopted for at least one time of filtration treatment, the concentration of arsenate in the hydroxyethyl diphosphoric acid after secondary filtration treatment is reduced to 4.60 mg / kg from 480.02 mg / kg, and the arsenic content of the hair dye prepared from the hydroxyethyl diphosphoric acid is smaller than 0.07 mg / kg. According to the polyamide acid-resistant nanofiltration membrane containing the Troger structure, which is obtained by adopting a limited preparation method, the acid resistance is greatly improved, the separation selectivity is higher, arsenic in hydroxyethyl diphosphate can be effectively removed, and the arsenic content in a hair dye is greatly reduced.

The invention discloses a closed cycle utilization method of a zirconium-based arsenic removal agent. The method comprises the following steps: (1) taking zirconium sulfate as the arsenic removal agent used for the first time; the roasted material prepared in the step (4) is adopted as an arsenic removal agent for follow-up recycling; adding an arsenic removal agent into the arsenic-containing acid liquid and / or zirconium arsenate thin slurry, and carrying out solid-liquid separation to obtain arsenic-removed slag and arsenic-removed liquid; (2) mixing the arsenic-removed liquid with macroporous composite exchange resin, and carrying out zirconium removal reaction to obtain zirconium-loaded resin and purified liquid; (3) mixing the zirconium-loaded resin with the arsenic-containing acid solution, and separating resin particles from the slurry containing the zirconium arsenate precipitate by using a solid-liquid separation device to obtain regenerated resin and zirconium arsenate thin slurry; (4) mixing the arsenic-removed slag with a sulfuric acid solution and elemental sulfur, carrying out a reduction roasting reaction to obtain a roasted material, and condensing gas released by the reaction to obtain a mixture of sulfuric acid and arsenious acid; and (5) cooling the mixture of sulfuric acid and arsenious acid, and carrying out centrifugal separation to obtain arsenic trioxide solid and a sulfuric acid solution.

The application provides a process for recycling electrolytic copper to efficiently smelt and form copper balls, which comprises an electrolyte purification and arsenic removal process and an electrolytic copper smelting and forming copper ball process; the electrolyte purification and arsenic removal process comprises: evaporating and concentrating and cooling and crystallizing the arsenic-containing electrolyte to separate copper sulfate crystals and a crystallization mother liquor; introducing an oxidizing agent into the crystallization mother liquor to oxidize trivalent arsenic into pentavalent arsenic; adding an iron salt and a pH regulator into the oxidized solution to control the pH value to be 3.5-4.5, so that arsenic is precipitated in the form of ferric arsenate; solid-liquid separation is performed to obtain ferric arsenate slag and a post-arsenic-removal solution, and the ferric arsenate slag is discharged for disposal; the electrolytic copper smelting and forming copper ball process comprises: performing pickling, water washing and drying on cathode electrolytic copper obtained through electrolytic refining, and then pressing the cathode electrolytic copper into dense copper blocks; smelting the dense copper blocks under the protection of inert gas, performing degassing and deoxidizing refining after melting, pouring and forming the refined copper liquid, and sequentially performing air natural cooling and water mist cooling to room temperature after demolding.

The invention belongs to the technical field of dressing and smelting solid waste treatment, and particularly relates to a treatment method of causticized arsenic precipitation post-liquid. According to the method, the causticized arsenic precipitation post-liquid is subjected to reselection separation, the calcium arsenate which is highly suspended, low in calcium arsenate content and extremely fine, difficult to filter and has the particle size smaller than 10 microns in the post-liquid is removed in advance and is not introduced into a filtering system, the filtering pressure of the causticized arsenic precipitation post-liquid is greatly reduced, the filtering efficiency is improved, the filtering energy consumption is reduced, and the extremely fine calcium arsenate can be returned to serve as a seed crystal; causticization arsenic precipitation operation is promoted; the method comprises the following steps: separating a calcium arsenate product from which extremely fine calcium arsenate is removed by adopting a shaking table to obtain narrow-fraction calcium arsenate with different particle sizes, and carrying out grading and solid-liquid separation, so that calcium arsenate filter residues with high calcium arsenate content and low water content are obtained, and the amount of residues returned to a smelting system can be effectively reduced; and high-quality alkaline filtrate with low impurity content is obtained, electrolyte purification operation is recycled, the efficiency of a filtering system, a front-end electrolyte purification system and a smelting system is improved, energy conservation and environmental protection are achieved, and cost reduction and efficiency improvement are achieved.

The present application relates to the technical field of soil remediation, and discloses a risk reduction method for environmental arsenic pollution, which comprises the following steps: preparing a culture medium, culturing a nitrogen-fixing microbial flora in an antibiotic-resistant manner, co-culturing the nitrogen-fixing microbial flora and arsenic-polluted soil, and analyzing the influence of soil arsenic conversion efficiency, so that the arsenic content in the soil is significantly reduced, the arsenic resistance of the nitrogen-fixing microbial flora reaches 500 mg / kg, the harm of soil arsenate is reduced, the safe management and control of arsenic-polluted soil can be realized, the nitrogen-fixing microbial flora can significantly reduce the content of trivalent arsenic in the soil, the trivalent arsenic with strong toxicity in the soil is more converted into pentavalent arsenic with weak toxicity, the conversion efficiency can reach more than 94.36%, and the risk reduction method for environmental arsenic pollution is successfully constructed, which has strong functionality and good popularization.

The application discloses a method for removing arsenic from a copper sulfate solution, which comprises an oxidation and arsenic removal step, and specifically comprises the following steps: adding an arsenic-containing copper sulfate solution to be treated into an oxidizing agent to obtain material a through stirring reaction; adding an arsenic removal agent into the material a, adding a pH regulator to adjust the pH value of the solution to 3.5-4.5 to perform an arsenic removal reaction, and performing solid-liquid separation after the reaction to obtain arsenate precipitate and copper sulfate solution after arsenic removal; and the arsenic removal agent is iron sulfate. The application can guarantee product quality, optimize the process, reduce copper loss, protect stable operation of equipment, reduce comprehensive cost, eliminate arsenic pollution and compliance risks, and promote green and high-quality development of the copper smelting and deep processing industry.

The application relates to a method for regulating and separating arsenic and valuable metals in smelting flue gas, and belongs to the field of clean production technology. After chalcopyrite powder is mixed into smelting flue gas, on one hand, metal oxides are converted into sulfates, and on the other hand, formed arsenate can be dissociated, arsenic is volatilized in the form of As2O3, and metals are converted into corresponding sulfates and oxides to return to a smelting system, formation of arsenate in the flue gas is inhibited, the purpose of separating arsenic and valuable metals is achieved, and the efficiency of dry collection of As2O3 in the flue gas is improved. Formation of arsenic-containing dust is reduced, and production cost of a smelting enterprise is saved.

The present application relates to the technical field of biology, in particular to a Medicago sativa MsPT1 gene and application thereof, the nucleotide sequence of the MsPT1 gene is shown as SEQ ID No.1, and the coding amino acid sequence is shown as SEQ ID No.2.The MsPT1 gene can promote the absorption of arsenate by plants, improve biomass and inorganic phosphorus content, is the most direct and effective way to improve the absorption and utilization of arsenate by crops to improve the nitrogen and phosphorus nutrient efficiency and yield of crops, and through molecular breeding to improve plants, not only can improve the yield and quality of plants, but also has important significance for environmental protection.

The invention discloses a method for solidifying and stabilizing arsenic-containing sludge based on copper slag, and relates to the technical field of dangerous solid waste treatment and resource utilization. The method comprises the following steps: firstly, grinding the copper slag rich in iron and silicon to a high specific surface area, then uniformly mixing the copper slag with arsenic-containing sludge, aggregate, an acid leaching agent and an oxidizing agent, then briquetting and shaping, and curing for 2-8 days under the conditions of specific temperature and humidity to finally form a stable copper slag-based arsenic-containing sludge solidified body. According to the method, a large amount of industrial solid waste copper slag is used as a main material, iron and silicon resource attributes of the industrial solid waste copper slag are fully utilized, and efficient chemical fixation and physical wrapping of arsenic are achieved by forming a compact silica gel-arsenate inclusion; by using waste to treat waste, the method is low in cost, simple in process flow and low in leaching toxicity of the solidified body, and has a good industrial application prospect.

The application discloses a kind of polyamide acid-resistant nanofiltration membrane and its application in hair dye preparation of dearsenic.The acid-resistant nanofiltration membrane of amide is obtained by the interface reaction of polyamine monomer and trimesoyl chloride on the ultrafiltration support bottom membrane, and the polyamide acid-resistant nanofiltration membrane containing trog structure is obtained.The method for removing arsenic in hydroxyethylidene diphosphonic acid is at least once filtering treatment by using the polyamide acid-resistant nanofiltration membrane containing trog structure, and after secondary filtering treatment, the concentration of arsenate in hydroxyethylidene diphosphonic acid is reduced from 480.02 mg / kg to 4.60 mg / kg, and the arsenic content of hair dye prepared from the hydroxyethylidene diphosphonic acid is less than 0.07 mg / kg.The polyamide acid-resistant nanofiltration membrane containing trog structure obtained by using the limited preparation method has greatly improved acid resistance, higher separation selectivity, and can effectively remove arsenic in hydroxyethylidene diphosphonic acid, greatly reducing the arsenic content in hair dye.

The invention discloses a low-cost method for removing arsenic and fixing arsenic from regenerated copper black copper sludge, which comprises the following steps: mixing regenerated copper black copper sludge with an alkaline soluble solution, adding an oxidizing agent to convert As into arsenate to enter the solution and copper enters slag under an alkaline condition to realize arsenic-copper separation in one step, and then stirring, slurrying and wet-grinding the arsenate solution and calcium oxide to obtain the arsenic-containing copper sludge. According to the method, arsenate and calcium oxide are subjected to a chemical reaction to convert arsenate into calcium arsenate precipitate, and calcium oxide is exposed all the time through wet grinding and can be continuously subjected to a contact reaction with an arsenic-containing solution, so that arsenic is removed under the low-calcium condition, a large amount of soluble alkali is prevented from being consumed, and the reaction efficiency is greatly improved; and the recovered filtrate and cleaning liquid are used as leaching liquid (soluble alkali solution) for cyclic leaching, so that zero wastewater discharge of the process is realized, and the industrial cost is reduced. The copper recovery rate reaches 99% or above, the arsenic removal rate reaches 95% or above, and the open circuit efficiency is high. The arsenic finally exists in the form of calcium arsenate, and the arsenic-calcium ratio of the calcium arsenate is high.

This invention discloses a room-temperature and atmospheric-pressure alkaline leaching pre-oxidation-calcium chloride synergistic arsenic removal system and process for high-arsenic-sulfur gold concentrate. The process includes: fine grinding, alkaline pre-oxidation, calcium chloride synergistic arsenic and sulfur removal, solid-liquid separation, and cyanide leaching. In the alkaline pre-oxidation stage, NaOH is added and oxygen is introduced to achieve efficient oxidation of arsenic-sulfur minerals under room-temperature and atmospheric-pressure conditions. Subsequently, calcium chloride is added to rapidly precipitate arsenate and sulfate ions, forming stable calcium salt precipitates. This process effectively solves the problems of low cyanide leaching rate in high-arsenic-sulfur gold concentrate, equipment blockage caused by arsenic and sulfur accumulation in closed-loop circulation, and decreased leaching rate. Experimental results show that this invention can significantly improve the gold leaching rate and reduce cyanide consumption, demonstrating good industrial application value and economic efficiency.

The application relates to a method for regulating separation of arsenic and valuable metals in smelting flue gas, and belongs to the field of clean production technology. After active carbon and chalcopyrite powder are mixed into the smelting flue gas, on one hand, oxygen in the flue gas is consumed to inhibit the formation of arsenate, and on the other hand, active sulfur components are provided to regulate the conversion of metal oxides into sulfates, and arsenic is volatilized in the form of As2O3, so that the target of separating arsenic from valuable metals is achieved. The application inhibits the formation of arsenate in the flue gas, improves the efficiency of dry condensation collection of As2O3 from the flue gas, and reduces the formation of arsenic-containing dust.

The utility model discloses a system for harmlessly treating arsenic and recovering lead from copper smelting white smoke dust, which comprises an oxygen-enriched reinforced reduction smelting furnace and a pressure leaching reaction kettle, a lead bullion discharge port of the oxygen-enriched reinforced reduction smelting furnace is communicated with a feed port of an electrolytic refining system, and the pressure leaching reaction kettle is communicated with the lead bullion discharge port of the electrolytic refining system. And a discharge port of the pressure leaching reaction kettle is communicated with a feed port of the oxygen-enriched reinforced reduction smelting furnace. According to the utility model, the pressure leaching reaction kettle is additionally arranged, heating and pressurizing are adopted, and ferrous sulfate is added, so that lead bismuth slag and other lead-containing materials are obtained, and more than 90% of arsenic in the copper smelting white smoke dust is converted into iron arsenate; and then the raw materials, flux, scrap iron, coke and return slag are fed into an oxygen-enriched reinforced reduction smelting furnace to be subjected to reduction smelting to obtain crude lead, lead matte, arsenic-iron alloy, reduction furnace slag and reduction furnace smoke dust, harmless treatment of arsenic is achieved, the crude lead is subjected to electrolytic refining through an electrolytic refining system, and lead ingots are prepared.

The invention discloses a resource recycling method for arsenic in wastewater, and belongs to the technical field of wastewater treatment and resource recycling. The resource recycling method for arsenic in wastewater comprises the following steps: preparing a mixed solution of sodium iodide, sodium sulfite and sodium carbonate, and adding the mixed solution into arsenic-containing wastewater to be treated; the method comprises the following steps: introducing nitrogen into arsenic-containing wastewater to be treated containing sodium iodide, sodium sulfite and sodium carbonate, stirring and carrying out light treatment, reacting to obtain an arsenic-containing solid, and sequentially centrifuging and freeze-drying to recycle the arsenic-containing solid. According to the method, arsenate in the wastewater can be reduced and separated to generate high-purity arsenic elementary substance and arsenic trioxide products. Compared with the prior art, the method has the advantages that generation and accumulation of arsenic-containing solid wastes are avoided, the risk of secondary pollution is eliminated, and efficient recovery and resource utilization of the arsenic element are realized.

The invention discloses a method for regenerating and recycling a titanium-based arsenic removal agent, which comprises the following steps: (1) mixing a titanium-rich material with a sulfuric acid solution, and carrying out roasting reaction to obtain a roasted material A as the titanium-based arsenic removal agent used for the first time; the method comprises the following steps: adding a titanium-based arsenic removal agent into an arsenic-containing acid solution, and carrying out solid-liquid separation to obtain arsenic-removed slag and arsenic-removed solution; (2) mixing the arsenic-removed slag with a sulfuric acid solution and sulfur, carrying out a reduction roasting reaction to obtain a roasted material B, and condensing gas released by the reaction to obtain a mixture of sulfuric acid and arsenious acid; (3) cooling the mixture of sulfuric acid and arsenious acid to below 10 DEG C, and performing centrifugal separation to obtain arsenic trioxide solid and a sulfuric acid solution; (4) mixing the arsenic-removed liquid with macroporous composite exchange resin, and carrying out titanium removal reaction to obtain titanium-loaded resin and purified liquid; and (5) mixing the titanium-loaded resin with the arsenic-containing acid solution, and separating resin particles from the slurry containing the titanium arsenate precipitate by using a solid-liquid separation device to obtain regenerated resin and titanium arsenate thin slurry.

The present application belongs to the field of environmental microorganism and heavy metal pollution control technology, and particularly relates to a method for enhancing anaerobic arsenic oxidation of microorganisms in natural water system sediment system. The method retains the original microbial community of the natural water system sediment system, adds nitrate as an electron acceptor to the arsenic-containing sediment system, and introduces dissolved organic matter from the same water system raw water concentrate under light conditions to promote the conversion of arsenite to arsenate by microorganisms using its photosensitivity, thereby further enhancing the anaerobic oxidation process of arsenic. The present application does not require exogenous functional bacteria inoculation, artificial photosensitizer or electrode material, and can realize the oxidation and immobilization of arsenic under near-natural conditions, and is suitable for in-situ or near-in-situ regulation and remediation of arsenic pollution in sediment systems such as rivers, lakes, tailings ponds and paddy fields.

The invention relates to the technical field of metallurgy, in particular to a method for comprehensively utilizing arsenic-containing smoke dust and synthesizing arsenic fixing minerals by a precipitation conversion method, which comprises the following steps of: performing oxygen pressure water leaching and solid-liquid separation on the arsenic-containing smoke dust to obtain arsenic-containing leachate and leaching residues; adjusting the pH value of the leachate to 2.5-4.0, synchronously and continuously adding a calcium salt and an iron salt into the leachate under heating and stirring conditions, accurately controlling the pH value of a reaction system to be stabilized in the same range through a neutralizer, completing a co-precipitation reaction in one step, directly generating a calcium iron arsenate arsenic fixing mineral, and realizing the solidification of arsenic; and washing the leaching residues to obtain low-arsenic washing residues, returning the washing liquid to the leaching process, and recovering valuable metals from the low-arsenic washing residues through reduction smelting. The traditional step-by-step lime arsenic precipitation and precipitation conversion are combined into one-step co-precipitation, so that the technical problems of lengthy process flow, large equipment investment and occupied area and complex operation control caused by step-by-step operation in the prior art are effectively solved.

This invention discloses a method for separating and recovering selenium and fixing arsenic in copper anode mud using vacuum roasting, comprising the following steps: a) crushing and screening the copper anode mud to obtain powder; b) uniformly mixing the obtained powder with an iron-based arsenic fixing agent to obtain mixture A; c) placing mixture A in a roasting furnace, then introducing a mixture of inert carrier gas and oxygen-containing gas, and maintaining the system absolute pressure at 1-20 kPa and oxygen partial pressure at 1%-10%, roasting at 400-750℃ for 0.5-4 hours to obtain roasting residue B with arsenic fixed in the form of ferric arsenate and selenium-containing flue gas C; d) passing the selenium-containing flue gas C into a sodium thiosulfate solution for absorption and reduction, and obtaining elemental selenium product D after filtration, washing, and drying; e) leaching the roasting residue B with dilute sulfuric acid to recover the valuable metals copper and silver therein. The above method has a short process flow, good selenium and arsenic separation effect, and can ensure environmental safety in the subsequent valuable metal recovery process.

This application relates to an arsenic phase modifier, its preparation method, and its application in controlling the separation of arsenic from valuable metals in smelting flue gas, belonging to the field of clean production technology. The arsenic phase modifier is a compound or mixture having the chemical formula CuFe2S3. This invention also provides a method for obtaining CuFe2S3 by mixing chalcopyrite powder and sulfur powder and then activating the mixture through mechanical ball milling. After the arsenic phase modifier CuFe2S3 is mixed into the smelting flue gas, it consumes oxygen in the flue gas to inhibit arsenate formation and provides active sulfur components to enhance the conversion of metal oxides into sulfates. Arsenic volatilizes in the form of As2O3, thereby achieving the goal of separating arsenic from valuable metals.