23 results about "Arsenic acid" patented technology

The present invention discloses a method for removing impurities from waste acid and fully recycling the waste acid. The method comprises the following steps: introducing hydrogen sulfide into the waste acid for a sulfidation reaction, removing arsenic sulfide and mercuric sulfide precipitates formed during the reaction; continuing to introduce hydrogen sulfide for a step-by-step sulfidation reaction, adding an iron-containing substance to adjust the reaction pH and ORP, and recovering the copper, lead, and zinc sulfide slag precipitates formed during the reaction in a step-by-step manner; adding an iron-containing substance for a neutralization reaction, controlling the pH and ORP, promoting the reaction between iron ions and arsenate, and removing the ferric arsenate precipitate formed during the reaction; adding an adsorbent for an adsorption reaction, and removing fluorine-containing and thallium-containing components by adsorption; introducing an oxidant for an oxidative hydrolysis reaction, controlling the degree of hydrolysis, and preparing polyferric sulfate. The present invention utilizes the iron-containing substance to remove impurities from waste acid, thereby achieving deep impurity removal and full resource utilization of waste acid.

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 invention relates to the technical field of refining of high-purity boric acid, and particularly discloses a method for removing divalent metal ions in high-purity boric acid, which comprises the following steps: dissolving the high-purity boric acid in water, filtering, adsorbing by adsorbent resin, filtering to obtain a refined boric acid solution, cooling, crystallizing, evaporating, crystallizing, carrying out suction filtration, and crushing to obtain the refined boric acid. The preparation method of the adsorption resin comprises the following steps: (1) blending polystyrene master batches with acetyl chloride, dispersing, and adding Lewis acid for reaction to obtain acetylated polystyrene particles; and (2) dispersing acetylated polystyrene particles, mixing with p-aminobenzene arsenic acid to react, filtering, and washing with alcohol to obtain the adsorption resin. After the high-purity boric acid is treated by the adsorbent resin prepared by the invention, the purity of the high-purity boric acid can reach 99.99%, and the effect of removing divalent metal ions in the high-purity boric acid can be realized.

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 present invention relates to a method for recovering valuable elements from polymetallic arsenic acidic wastewater, comprising the following steps: metal element content detection; mixed precipitation of copper, arsenic, gold, and silver; purification of the acidic mother liquor for iron removal; preparation of high-quality gypsum; two-stage leaching of the harmful element arsenic; and arsenic solidification treatment. The method utilizes a rational combination of sodium hydrosulfide and 25# black powder to fully precipitate copper arsenic ions and fine gold and silver particles in the acidic wastewater, significantly improving the recovery rate of the target components. The precipitate is then subjected to two-stage leaching for arsenic removal using either a raw acidic wastewater solution or the addition of copper sulfate, thereby obtaining high-quality gold, silver, and copper concentrate while reducing the amount of copper sulfate used. The filtered iron-containing acidic mother liquor is then subjected to iron removal and gypsum treatment to produce high-quality gypsum and ferric hydroxide. The intermediate product, ferric hydroxide, is then directly used for arsenic removal from the arsenic-containing acidic mother liquor. Through a synergistic effect with lime milk, the harmful element arsenic can be efficiently removed, achieving comprehensive recovery and harmless treatment of the valuable elements in the acidic wastewater.

The present invention discloses a method for co-utilizing red mud and arsenic alkali residue to prepare a composite catalyst, its product and application, belonging to the field of resource utilization of industrial waste. The preparation process of the method of the present invention is simple, the raw materials for preparation are widely sourced, and the full utilization of red mud and arsenic alkali residue can be achieved. Compared with traditional titanium dioxide and iron arsenate catalysts, the composite catalyst prepared by the present invention has more excellent performance, can significantly improve the treatment efficiency of landfill leachate, and can achieve the catalytic removal effect of up to 2145 mg / g COD, 162 mg / g total phosphorus, 356 mg / g ammonia nitrogen, and 122 mg / g mercury.

The present invention discloses a method for efficiently enriching germanium by treating vortex furnace dust. The method comprises the following steps: (1) uniformly mixing vortex furnace dust containing germanium with a vulcanization accelerator to obtain a germanium-containing material; (2) volatilizing the germanium-containing material under a protective atmosphere at a temperature of 1000°C to 1200°C for 2 to 8 hours, collecting dust to obtain germanium-arsenic-rich dust and a volatilized residue; (3) subjecting the germanium-arsenic-rich dust to oxygen pressure leaching treatment, and performing liquid-solid separation to obtain a germanium-rich solution and a leaching residue; (4) adding concentrated hydrochloric acid to the germanium-rich solution to adjust the hydrochloric acid concentration to 8 to 10 mol / L, and distilling to obtain germanium tetrachloride and a distillation residue; (5) diluting the distillation residue to a hydrochloric acid solution concentration of 1 to 2 mol / L, and then returning the distillation residue to the oxygen pressure leaching process. The present invention successfully separates germanium and arsenic from vortex furnace dust by using an oxygen pressure leaching method, and converts arsenic into ferric arsenate. The hydrochloric acid consumption in the subsequent chlorination distillation process is greatly reduced through the above-mentioned pretreatment process, and the arsenic and ferric arsenate are returned to the oxygen pressure leaching arsenic and iron separation process to realize the closed-loop recycling of the chlorination distillation residue.

The invention discloses a method for efficiently removing arsenic from a crude germanium tetrachloride solution based on arsenic hydride reduction, and belongs to the technical field of rare and noble metal metallurgy. According to the method, arsenic hydride gas is introduced into a crude germanium tetrachloride solution containing arsenic impurities under the protection of inert atmosphere and under the mild condition of 20-80 DEG C; the arsenic hydride and arsenic compounds such as arsenic trichloride, arsenious acid and arsenic acid in the solution are subjected to selective reduction reaction to generate simple substance arsenic solid precipitate. Then a germanium tetrachloride solution subjected to deep arsenic removal can be obtained through simple solid-liquid separation operation, obtained arsenic-containing solids are washed and dried, and resource recycling of crude arsenic products is synchronously achieved. The method provided by the invention initiates a new arsenic removal path of reduction-precipitation, has the outstanding advantages of high arsenic removal efficiency, good selectivity, short process flow, no secondary pollution and capability of realizing arsenic resource utilization, and provides a brand new solution for green and efficient preparation of high-purity germanium tetrachloride.

The invention relates to the technical field of compound purification, and particularly discloses a heteropolyacid extraction and purification method based on temperature and acidity dual regulation, which comprises the following steps: reacting tungstate radical or molybdate radical with arsenic acid or phosphoric acid at a certain temperature in the presence of acid to prepare a crude heteropolyacid solution, then carrying out contact reaction with an oxygen-containing extraction agent, recovering heat by adopting a heat pump, and purifying the crude heteropolyacid solution. The temperature is kept below 40 DEG C, the obtained heteropolyacid loaded organic phase is mixed with water vapor for heat exchange, in the water vapor condensation process, heteropolyacid in the organic phase is reversely extracted to the water phase, reverse extraction liquid is obtained, the organic phase is regenerated, and a regenerated organic phase is obtained; and evaporating and concentrating the obtained heteropolyacid strip liquor to obtain heteropolyacid concentrated liquor, and returning water vapor containing heat for use. According to the method, the carbon emission can be reduced, the reverse extraction rate of heteropoly acid can be improved, the water consumption of the system is greatly reduced, and alkaline substances such as sodium hydroxide and ammonia water are not used.

The invention relates to a high-arsenic zinc oxide smoke dust arsenic removal method which comprises the following steps: 1) copper recovery: adding a predetermined amount of a copper removal agent into a stirring tank filled with zinc oxide smoke dust pickle liquor, stirring and reacting for 30-60 minutes, and performing solid-liquid separation to obtain copper sludge and copper removal filtrate; (2) arsenic separation: the copper-removed filtrate enters an oxidation reaction stirring tank, ferric salt and an oxidizing agent are sequentially added for precipitation and arsenic removal, the stirring speed is controlled to be 200-400 r / min, the reaction temperature is 75-85 DEG C, and iron arsenate precipitation and arsenic-removed liquid are obtained through solid-liquid separation. According to the zinc oxide smoke dust arsenic removal treatment process, rapid separation of copper ions, zinc ions and arsenic ions is achieved, arsenic is stably removed, meanwhile, loss of the zinc ions is greatly reduced, used chemicals are low in price and easy to obtain, used equipment is conventional devices, and the process is simple, safe, efficient, small in energy consumption and low in cost.

The present invention belongs to the field of environmental engineering and resource recovery technology, and specifically relates to a method for preparing elemental arsenic from high-arsenic acid wastewater using a Me-C reduction method. The present invention mainly uses micro-electrolysis to efficiently reduce arsenic in wastewater to a high-purity elemental state (As 0 ); first, Me-C is used to reduce arsenic in high-arsenic acid mine wastewater to obtain a crude arsenic product. Existing distillation technology is then used to further improve the purity of the arsenic product to obtain impurities and an arsenic-removed product. The impurities are returned to the reduction and arsenic extraction process to save costs. The low-arsenic solution is then neutralized and impurities removed to obtain a purified solution, which is then returned to the company's production process for reuse. This method combines the advantages of efficient wastewater purification with a high yield of elemental arsenic. While purifying the wastewater, elemental arsenic is recovered, and the arsenic content in the treated solution is significantly reduced, reducing subsequent processing costs.

This invention provides a standard quality control sample for edible fungi matrix containing multiple arsenic forms, its preparation method, and its application, relating to the field of standard material technology. The invention involves preparing a powder from dried edible fungi samples (containing monomethylarsenic acid, dimethylarsenic acid, arsenic betaine, and arsenite) to obtain a powder sample. An aqueous solution of arsenate is added to the powder sample, and the resulting wet powder sample is then sequentially dried, pulverized, and mixed to obtain a standard quality control sample for edible fungi matrix containing multiple arsenic forms. This invention uses dried edible fungi samples as raw materials, and the prepared edible fungi matrix standard quality control sample is easy to preserve stably, and temporary sampling is less likely to induce arsenic form conversion. The method of this invention is simple, and the prepared edible fungi matrix standard quality control sample exhibits good uniformity and excellent stability. It can be used for the accurate quantification of inorganic arsenic in edible fungi, and through the qualitative determination of organic arsenic, it can effectively prevent false positives in inorganic arsenic results, effectively improving the accuracy and reliability of the detection results.

The application discloses a solid arsenic method of constructing an iron arsenate@cookeite core-shell structure by in-situ self-assembly, and relates to the field of non-toxic and harmless treatment of by-products containing arsenic in non-ferrous metal smelting. The application proposes that arsenic is precipitated by using iron salt of high-arsenic wastewater or waste residue, and arsenic source and ferrous source are added to prepare a slurry, and under the condition of hydrothermal oxygen pressure, an outer cookeite shell is formed on the surface of the iron arsenate by directional in-situ self-assembly through the way of arsenic-iron ion oxidation and co-precipitation, so that the core-shell structure of iron arsenate@cookeite is obtained. The arsenic concentration in the toxic leaching of the solid arsenic core-shell structure is lower than the value 5mg / L specified in the national standard (GB5085.3-2007), and the solid arsenic material is non-toxic and harmless. The dense outer shell layer of the cookeite which is crystallized by the oxidation and co-precipitation of arsenic-iron ions in the solution in the hydrothermal oxygen pressure environment is coated on the surface of the iron arsenate, which inhibits the dissolution of the iron arsenate and blocks the release of arsenic. The application solves the technical problems of poor stability and solid arsenic property of the iron arsenate residue, and achieves the non-toxic treatment of the iron arsenate residue.

The invention discloses a method for synergistically fixing arsenic from iron scale solid waste and high-arsenic hazardous waste, and relates to the non-toxic and harmless field of high-arsenic byproducts in non-ferrous metal metallurgy. According to the method, high-arsenic smoke dust is subjected to oxygen pressure acid leaching recovery to obtain lead-antimony concentrate, meanwhile, produced high-arsenic acid leaching liquid is completely transferred into a hydrothermal kettle, solid arsenic iron source iron scale powder is added, and regular octahedral scorodite is synthesized through oxidation and coprecipitation under the conditions of high temperature and high oxygen pressure. The arsenic concentration in the toxic leaching of the scorodite synthesized by the method meets the requirement of the specified value (less than or equal to 5mg / L) of the national standard (GB5085.3-2007), and the scorodite is a non-toxic and harmless solid arsenic product. The iron scale solid waste is dissolved in hydrothermal oxygen pressure to generate Fe < 2 + > and Fe < 3 + >, oxidation coprecipitation crystallization is promoted to obtain scorodite, and the efficient arsenic fixing effect is achieved. The method provided by the invention solves the problems of toxicity of high-arsenic hazardous waste and consumption of iron scale solid waste, and achieves the target of fixing arsenic with waste. The method has the advantages of simplicity in operation, high arsenic fixing efficiency, good arsenic fixing stability of scorodite and the like.

The invention discloses a method for strengthening the chemical oxidation of arsenopyrite. Specifically, a certain amount of pyrite is added to an arsenopyrite chemical oxidation system, and the acid-generating property of pyrite during oxidation is utilized to reduce the pH value of the system, so that ferric hydroxide precipitates in a passivation layer are converted into ferric arsenate. Pyrite is also utilized as an Fe source to increase the Fe / As molar ratio in the system, so as to reduce the stability of the ferric arsenate in the passivation layer. Since Fe(III) and Fe(II) on sulfur defect sites on the surface of pyrite can activate small molecule environmental media, the generated reactive oxygen species (ROS) have an oxidizing ability for arsenopyrite, thereby achieving the purpose of strengthening the oxidation of arsenopyrite. The method of the invention increases the arsenic leaching rate in the arsenopyrite chemical oxidation system by nearly 3 times at most, and has a significant strengthening effect on the oxidation of arsenopyrite. At the same time, the method is simple in process, mild in conditions, and easy to operate.

A method of extracting a metal of interest comprises dissolving an oxidizable metal compound in an electrolyte contained in an electrochemical cell; dissolving a sulfoarsenide compound comprising the metal of interest in the electrolyte; applying a current between an anode and a cathode of the electrochemical cell to produce an electrochemical product solution comprising soluble metal ions of the oxidizable metal compound, soluble metal ions of the metal of interest, and a soluble arsenic acid; reacting the soluble arsenic acid with the metal ions of the oxidizable metal compound to form an insoluble arsenate compound comprising the metal of the oxidizable metal compound; and separating the soluble metal ions of the metal of interest from the insoluble arsenate compound. Also disclosed is a method of extracting a metal of interest from a metal containing feed stream, and a method of isolating cobalt from a metal containing feed stream.

The invention discloses a method for treating copper-containing high-arsenic hazardous waste and application of the method, and relates to the technical field of chemical metallurgy. The method comprises the following steps: carrying out acid leaching on the white smoke dust, and carrying out solid-liquid separation to obtain acid leaching residues and an acid leaching solution; adding goethite slag into the acid leaching solution to carry out first reaction to obtain arsenic-iron leaching slag and first reaction solution; iron powder is added into the first reaction liquid for second reaction, and copper slag and second reaction liquid are obtained; and adding steel mill soot and an oxidizing agent into the second reaction liquid to carry out third reaction to obtain goethite slag and iron-removed liquid. When the method is used for treating the copper-containing high-arsenic hazardous waste white smoke dust, only one kind of arsenic acid iron slag is generated and piled, other filter residues are even and can be sold in a pricing mode, and the method has good application prospects in the aspects of efficient recycling of valuable metal and high-value utilization of the white smoke dust.

The application provides an octene hydroformylation reaction catalyst composition and an application method thereof. The catalyst composition comprises a catalyst, an auxiliary agent and a solvent; wherein the active component of the catalyst comprises at least two of rhodium, cobalt and iridium; the auxiliary agent is a plurality of components; the auxiliary agent A is a phosphine-containing ligand with a general structure P(M1) x (M2) y wherein M1 is a phenyl group, M2 is a cyclohexyl group, x is an integer greater than or equal to 0, y is an integer greater than or equal to 1, and x+y=3; the auxiliary agent B is an epoxyfluoropropane; and the auxiliary agent C is 4-hydroxy-3-nitrophenyl arsenic acid. According to the differences in boiling points and the differences in the combination ability with active metals under different CO concentrations, the present application adjusts the generation of different normal and isomeric aldehydes in the hydroformylation reaction by regulating the ratios of different ligands and metals or changing the process conditions.

The invention discloses a multi-stage gradient distillation impurity removal device for germanium purification and a purification method, and relates to the technical field of rare metal purification. Through the multi-stage gradient design of first-stage distillation, second-stage re-distillation arsenic removal and third-stage rectification, a directional and synergistic separation mechanism based on the physical and chemical property difference of impurities is constructed; the first-stage distillation unit selectively volatilizes part of impurities with lower boiling points preferentially by controlling lower temperature and pressure, and high-boiling-point metal chlorides are retained at the bottom of a kettle due to insufficient saturated vapor pressure, so that first-stage crude separation is realized, and the second-stage re-distillation arsenic removal unit introduces chlorine gas, so that the high-boiling-point metal chlorides are separated from the bottom of the kettle; the three-stage rectification unit is used for oxidizing volatile arsenic impurities into non-volatile arsenic acid in situ, targeted chemical fixation and separation are realized, and the three-stage rectification unit is used for ultimate fine separation of trace impurities with similar boiling points on the basis of removal of high-boiling-point and specific impurities in the first two stages, so that fine separation based on relative volatility is realized.

The invention relates to a method for comprehensively recovering valuable elements from nonferrous smelting waste acid, and belongs to the technical field of metallurgical engineering. The method comprises the following steps: S1, pumping the waste acid into a first-stage reactor with the dissolved oxygen concentration controlled to be 2 mg / L or below, and adding zero-valent iron powder and pyrrhotite to carry out a reduction reaction, so that pentavalent arsenic in the waste acid is reduced into trivalent arsenic; after the reaction, carrying out solid-liquid separation to obtain copper sulfide slag and reduced liquid containing trivalent arsenic; s2, transferring the reduced liquid obtained in the step S1 to a second-stage reactor with an aeration or ventilation function, and blowing air, oxygen-enriched air or oxygen into the reduced liquid to carry out oxidation reaction, so that trivalent arsenic is oxidized and forms iron arsenate precipitate with iron ions; and after the reaction, carrying out solid-liquid separation to obtain iron arsenate slag and oxidized liquid. According to the method, high-selectivity and high-efficiency separation of copper and arsenic is realized through a valence oscillation strategy of first reduction and then oxidation. The average copper recovery rate is 98% or above, and the average arsenic removal rate is 99% or above.

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.

The invention discloses a method for synthesizing benzyl arsonic acid by acidizing arsenic acid. The method comprises the following steps: preparing arsenic acid, preparing sodium arsenite, adding benzyl chloride into the sodium arsenite to react to generate benzyl arsonic acid sodium, and standing for layering; acidizing arsenic acid until the pH value is 1-3 to generate benzyl arsonic acid and sodium arsenate; and adding a transforming agent into the sodium arsenate, and reacting for 2 hours to obtain a sodium arsenite solution which is recycled as a raw material. According to the method, the arsenic acid is used for replacing sulfuric acid to acidify the sodium benzyl arsonic acid to generate the benzyl arsonic acid, sulfate radicals are not introduced, and no sodium sulfate waste salt is generated; sodium arsenate is converted into sodium arsenite to be recycled as a raw material, so that cyclic utilization of sodium and arsenic is realized, and the method has remarkable environmental protection and resource utilization values.

This invention discloses a method for enhancing the bioleaching of arsenopyrite with bio-derived Schehertz minerals and simultaneously fixing arsenic, belonging to the fields of biometallurgy and mine environmental remediation technology. The method involves acclimating *Thiobacillus acidophilus* to arsenic tolerance in a culture medium containing arsenopyrite, then using the resulting arsenic-tolerant acclimation bacterial solution to biosynthesize Schehertz minerals. The synthesized Schehertz minerals are then uniformly mixed with the target arsenopyrite, and the arsenic-tolerant acclimation bacterial solution is added to initiate a bioleaching reaction, achieving in-situ solidification of arsenic. This method utilizes the strong adsorption capacity of the bio-derived Schehertz minerals for liquid-phase arsenic ions to rapidly reduce the concentration of free arsenic, thereby relieving the toxic inhibitory effect of arsenic on acidophilic microorganisms and shortening the microbial adaptation period. Simultaneously, the Schehertz minerals partially dissolve and release Fe in an acidic leaching environment. 3+ With As 5+ Co-precipitation forms ferric arsenate minerals, achieving in-situ stabilization and fixation of arsenic.