4 results about "Sodium arsenite" patented technology

This invention relates to a method for preparing high-purity sodium pyroantimonate from antimony-containing waste, belonging to the field of sodium pyroantimonate preparation technology. Specifically, the method includes: crushing and ball milling the antimony-containing waste, followed by sulfidation-alkali leaching in the presence of modified inorganic mineral additives. Antimony enters the solution as Na3[SbS3], while lead, copper, and iron precipitate as sulfides in the slag phase. The additives improve the settling and filtration performance of the leaching slag and assist in the adsorption of colloidal arsenic. After deep purification of the leachate with sodium sulfide, the mother liquor is cooled and crystallized to remove arsenic, which is separated as sodium arsenite crystals. The purified liquid undergoes air oxidation precipitation under seed crystal induction, followed by liquid-solid separation, washing, and drying to obtain high-purity sodium pyroantimonate product. This invention meets the quality requirements of electronic-grade glass clarifying agents, and features strong process compatibility, controllable additive costs, and recyclable mother liquor.

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 an arsenic in-situ growth-metal organic framework material which is arsenic oxide nanoparticles formed in situ on the surface of a metal organic framework material by performing ligand exchange on an arsenic compound and the metal organic framework material, the arsenic compound is selected from sodium arsenite, disodium arsenate heptahydrate, arsenic trioxide and the like; the metal organic framework material is selected from ZIF-8 and the like. The invention also discloses bionic nano-particles for in-situ growth of arsenic. The bionic nano-particles are formed by coating an arsenic in-situ growth-metal organic framework material with a cell membrane. The invention further discloses application of the arsenic in-situ growth-metal organic framework material and the bionic nanoparticles in preparation of drugs for treating cancers. The arsenic in-situ growth-metal organic framework material disclosed by the invention is bionic nano-enzyme with enzyme-like activity and dual epigenetic regulation and control effects, and is uniform in morphology and relatively small in particle size; and due to cell membrane coating, the bone marrow targeting property is realized, the problem of insufficient targeting property of an arsenic compound is solved, and the tumor immunotherapy effect is enhanced.

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.