14 results about "Sodium arsenate" patented technology

The invention belongs to the technical field of bioengineering, and relates to an ArsL mutant and an application of the ArsL mutant in synthesis of Arsinothricin. The ArsL mutant is a mutant obtained by mutating the 428th cysteine C of the amino acid sequence of wild AST synthetase ArsL into alanine A, and the amino acid sequence of the ArsL mutant is as shown in SEQ ID No.2. The invention also discloses a preparation method of the ArsL mutant. The invention also further provides an application of the ArsL mutant in catalysis of sodium methyl arsenate and S-adenosylmethionine to synthesize Arsinothricin. The invention further provides an application of the ArsL mutant in catalysis of sodium methyl arsenate and S-adenosylmethionine to synthesize Arsinothricin. The ArsL mutant disclosed by the invention has higher catalytic activity and thermal stability, the process of converting high-concentration MMA into AST is realized by utilizing the ArsL mutant, and the catalytic activity of the ArsLC428A mutant is obviously improved compared with that of wild type AST synthetase. In addition, compared with an organic synthesis path, a semi-organic enzyme synthesis path and a natural biological synthesis path, the yield of the synthesis path provided by the invention is obviously improved, and the ArsL mutant can be used as a potential industrial application enzyme and has a wide application prospect.

The present invention relates to the field of wastewater treatment, and more particularly to an activated sludge for treating wastewater contaminated with arsenic and butyl xanthate, and a preparation method thereof. The preparation method comprises: step 1, taking soil near a lead-zinc tailing as an original sample to obtain initial sludge; step 2, preparing a culture medium for culturing the sludge; step 3, adding the culture medium to an anaerobic bottle, and then placing the initial sludge into the bottle; step 4, adding sodium arsenate and butyl xanthate to the bottle, stirring evenly, exhausting oxygen, and oscillating to obtain acclimated anaerobic activated sludge. The present invention, through the steps of collecting and acclimating the activated sludge at a specific location, enables the cultivated activated sludge to have unique biological characteristics. The activated sludge can not only reduce arsenic without the addition of an organic carbon source, but can also effectively oxidize and remove xanthate, thus meeting the needs of low-cost and high-efficiency removal of arsenic and xanthate from mineral processing wastewater in oligotrophic mining areas.

This invention discloses a method for the simultaneous removal of arsenic and chlorine from waste acid based on sodium arsenite minerals, belonging to the field of wastewater treatment and resource recovery technology. The method includes: adding an oxidant to the waste acid solution; supplementing copper, sodium, calcium, and chlorine sources according to the stoichiometric ratio of sodium arsenite (NaCaCu₅(AsO₄)₄Cl·5H₂O); conducting a water bath heating reaction under stirring conditions; adjusting the pH of the solution; and inducing Na₂O. + Ca 2+ In situ, sodium arsenate precipitate (sodium arsenate chlorite) is formed by the coordination precipitation reaction of Cu²⁺, As(V), and Cl⁻. After solid-liquid separation, washing, and drying, the sodium arsenate chlorite mineral is obtained. This invention utilizes the coexistence of arsenic and chlorine in pollutants. By adjusting the ratio of key components and controlling the reaction conditions, both arsenic and chlorine are simultaneously introduced into the mineral lattice, achieving efficient removal and resource conversion of arsenic and chlorine. This invention achieves synergistic removal and resource utilization of pollutants, resulting in significant environmental and economic benefits.

The invention discloses a method for intensifying dissolution of arsenic lead ore solid solution through an electric field and application. The method comprises the following steps: preparing a mixed solution from a sodium arsenate solution and a sodium chloride solution in proportion, and preparing an arsenite solid solution by taking a lead acetate solution as a basic solution; different electrolytes are selected at the temperature of 25 DEG C according to the dissolving-out speed and concentration requirements of arsenic ions and lead ions, an arsenite solid solution is subjected to electric field strengthening rapid dissolution, and the technology provides technical support for electrokinetic remediation of soil polluted by arsenic and lead and resource utilization of tailings containing arsenic and lead.

The invention belongs to the technical field of arsenic-alkali residues, and discloses an arsenic-alkali residue treatment method which comprises the following steps: step 1, leaching separation, step 2, evaporation drying, step 3, plate-frame pressure filtration, and step 4, mixing to prepare sodium silicate. According to the invention, the mixed salt containing sodium arsenate and a proper amount of silicon powder are mixed and sintered, and only the reaction conditions of the reactants and silicon dioxide need to be considered in the reaction process of the mixed and molten sodium arsenate, sodium arsenite, sodium carbonate, sodium bicarbonate, sodium sulfate and quartz stone. Sodium silicate can be produced under a certain condition by melting and mixing the compounds, and actual application and operation are facilitated.

The invention discloses a method for removing arsenic and recovering copper from black copper sludge, and belongs to the technical field of secondary resource recovery of nonferrous metals. The method comprises the steps that firstly, oxidation leaching is conducted through oxygen in a sodium hydroxide alkaline medium, arsenic enters a solution in the form of sodium arsenate, valuable metal such as copper is enriched in slag, and efficient separation of arsenic and copper is achieved; copper-containing leaching residues can be returned to a copper smelting system to recover copper; adding calcium hydroxide into the sodium arsenate leachate for precipitation conversion to generate calcium arsenate slag to remove arsenic, and returning the regenerated sodium hydroxide solution to the leaching process for cyclic utilization; the technology is simple, the arsenic removal rate is high, the valuable metal recovery effect is good, regeneration and circulation of the reagent are achieved, and environment friendliness is achieved.

The invention relates to the field of wastewater treatment, in particular to activated sludge for treating wastewater containing arsenic and butyl xanthate combined pollution and a preparation method thereof.The preparation method comprises the steps that 1, soil near lead-zinc tailings is taken as an original sample, and initial sludge is obtained; step 2, preparing a culture solution for culturing sludge; step 3, adding a culture solution into an anaerobic bottle, and then putting the initial sludge into the bottle; and 4, adding sodium arsenate and butyl xanthate into the bottle, uniformly stirring, discharging oxygen, and carrying out shake culture to obtain the domesticated and cultured anaerobic activated sludge. According to the method disclosed by the invention, the cultured activated sludge has unique biological characteristics through collection and domestication steps at a specific site, arsenic reduction can be carried out under the condition of not additionally adding an organic carbon source, xanthate can be effectively oxidized and removed, and the yield of the activated sludge is increased. The requirements of low-cost and high-efficiency removal of arsenic and xanthate in beneficiation wastewater in an oligotrophic mining area and the like can be met.

A non-aqueous electrolyte includes: a first sodium salt, where the first sodium salt includes at least one of sodium hexafluorophosphate, sodium hexafluoroarsenate, sodium perchlorate, and sodium trifluoroacetate; and a second sodium salt, where the second sodium salt includes one, two, or more of a sodium salt having sulfonate, a sodium salt having oxalate, a sodium salt having phosphate, and a sodium salt having borate.

The application provides a method for comprehensively recovering calcium and arsenic from calcium-arsenic slag, comprising the following steps: S1: mixing and reacting calcium-arsenic slag and a sodium carbonate solution, and then filtering to obtain filtrate and filter residue containing calcium carbonate; washing the filter residue and collecting washing liquid A; the pH value of the mixing and reaction is 10-11; the temperature of the mixing and reaction is 25-60 DEG C; S2: mixing the filtrate and the washing liquid to obtain a sodium arsenate solution, adding ferrous sulfate, and controlling the oxidation-reduction potential to 400-550 mv by using hydrogen peroxide to precipitate arsenic. The application provides a method for comprehensively recovering calcium and arsenic from calcium-arsenic slag, the sodium-calcium replacement efficiency is improved by jointly controlling pH, temperature and liquid-solid ratio, the purity of the sodium arsenate solution is improved, then the pH-potential-iron-arsenic molar ratio is jointly controlled, under the conditions of relatively high pH, high potential and high iron-arsenic molar ratio, the tobermorite with a wheat grain shape is generated, and the leaching stability is good.

The invention belongs to the technical field of copper smelting flux, and particularly relates to a sodium borate-calcium-based composite flux, a preparation method and application of the sodium borate-calcium-based composite flux in copper fire refining. The sodium borate-calcium-based composite flux is composed of calcium carbonate, sodium borate, sodium carbonate and fluorite according to a specific proportion, and through the calcium-boron-sodium ternary synergistic effect, arsenic and antimony are efficiently removed, and meanwhile the yield of copper is increased. And the chemical erosion to the magnesite-chrome brick of the anode furnace is obviously reduced. Calcium oxide generated by high-temperature decomposition of calcium carbonate in the flux reacts with arsenic and antimony to generate stable calcium arsenate, sodium arsenate, calcium antimonate and sodium antimonate, so that efficient removal of arsenic and antimony is realized; b2O3 generated by decomposition of sodium borate and MgO in the magnesite-chrome brick form a high-melting-point Mg3B2O6 protection layer, the erosion rate of the magnesite-chrome brick is subjected to breakthrough control, the order of magnitude is reduced compared with a traditional process, and the melt viscosity is reduced through fluorite so as to promote slag-copper separation. The flux can completely replace a traditional sodium carbonate process, equipment transformation is not needed, the flux is suitable for crude copper containing high arsenic and antimony, the service life of a furnace lining is remarkably prolonged, and the copper grade is improved.

The invention provides a method for comprehensively recovering calcium and arsenic from calcium-arsenic slag. The method comprises the following steps: S1, mixing the calcium-arsenic slag and a sodium carbonate solution for reaction, and filtering to obtain filtrate and filter residues containing calcium carbonate; washing filter residues, and collecting a washing solution A; the pH value of the mixed reaction is 10-11; the temperature of the mixed reaction is 25-60 DEG C; and S2, mixing the filtrate and the washing liquid to obtain a sodium arsenate solution, adding ferrous sulfate, and controlling the oxidation-reduction potential to be 400-550mv with hydrogen peroxide for arsenic precipitation. The invention provides a method for comprehensively recovering calcium and arsenic from calcium-arsenic slag, which is characterized in that the sodium-calcium replacement efficiency is improved and the purity of a sodium arsenate solution is improved through combined regulation and control of pH, temperature and liquid-solid ratio, then scorodite with a wheat grain shape is generated under the conditions of relatively high pH, high potential and high iron-arsenic molar ratio by adopting combined regulation and control of pH-potential-iron-arsenic molar ratio, and the calcium and arsenic are comprehensively recovered from the calcium-arsenic slag. And the leaching stability is very good.

The invention discloses a preparation method and application of an arsenic-cadmium solid solution resistant to electric field stress and acid dissolution. The method comprises the following steps: preparing a cadmium chloride solution and a calcium chloride solution into a mixed solution according to a fixed molar ratio, taking a sodium arsenate solution as a basic solution, then adding the mixed solution into the basic solution, and controlling the molar ratio of the mixed solution, the concentration of the basic solution and the reaction temperature to obtain the arsenic-cadmium solid solution. The arsenic-cadmium solid solution synthesized by the method is low in arsenic-cadmium dissolution amount under different pH conditions and electric field stress conditions, and particularly has the strongest cadmium stability. Technical support can be provided for solidification and stabilization repair of arsenic-cadmium combined polluted soil and stable storage of tailings containing arsenic and cadmium.

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.

The invention relates to a process for converting a feed containing sodium thioarsenate comprising the steps: step a) providing an aqueous solution comprising sodium thi- oarsenate, wherein the solution has an pH value above 10, step b) adding lime to the solution of step a) to form in an aqueous slurry, step c) pressure oxidizing the slurry of step b) with oxygen, wherein oxygen is provided with an oxygen pressure of at least 6 bar, wherein the slurry is heated to a temperature of at least 100°C, and wherein a pH value above 10 is maintained during the pressure oxidation, to generate johnbaumite.