5 results about "Arsenic acid" patented technology

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.

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.

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.

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 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.