11 results about "Calcium arsenite" patented technology

The invention discloses a method for comprehensive recovery of lead-tin white soot containing arsenic and zinc and harmless vitrification of arsenic and a method for preparing an arsenic glass clarifying agent. The method comprises the steps of first-stage acid leaching, second-stage acid leaching, copper sulfide precipitation, zinc arsenate precipitation, alkaline leaching, calcium arsenate precipitation, calcium arsenate drying and harmless vitrification of arsenic. According to the method, the zinc raffinate acid liquor for zinc extraction is adopted for acid leaching, zinc in the zinc raffinate acid liquor can be recycled, sulfuric acid in the zinc raffinate acid liquor can be utilized, and two-stage acid leaching is conducted in sequence, so that the leaching rate of arsenic, zinc and copper is increased, the separation effect of valuable metal such as arsenic, zinc and copper from lead and tin is improved, and the recycling grade of lead and tin in the soot is improved; the processes of copper sulfide precipitation, zinc arsenate precipitation, alkaline leaching and calcium arsenate precipitation are adopted in sequence, and copper, zinc and arsenic in the leachate are extracted respectively; the arsenic-containing glass clarifying agent which is economic and environment-friendly is prepared from calcium arsenate extracted from the ash, and harmless resourceful treatment of arsenic in the white ash is realized.

This invention discloses a method and apparatus for preparing high-purity arsenic in an anhydrous liquid medium at high temperatures, belonging to the field of molten salt electrochemistry. The method uses a low-melting-point, highly stable calcium chloride (CaCl2)-based molten salt as the electrolyte, directly dissolving or dispersing calcium arsenate powder in the molten salt. Electrolysis is carried out under an inert atmosphere, with the electrolysis temperature controlled between 650-950℃. Arsenate ions (AsO4) are present at the cathode. 3‑ The arsenic is directly reduced to elemental arsenic. Because the operating temperature is much higher than the boiling point of arsenic (614℃), the elemental arsenic instantly vaporizes into arsenic vapor (As₄(g)) and escapes from the molten salt. The arsenic vapor is transported to a condensation system via a carrier gas, where it condenses into solid high-purity arsenic in a low-temperature zone of 200-300℃ for collection. Oxygen is released from the anode through an oxygen ion oxidation reaction. This invention achieves the direct conversion of stable arsenate into high-value-added, high-purity arsenic. The process is short, energy-efficient, and produces high-purity products, providing a novel pathway for the high-value utilization of arsenic-containing waste.

The invention discloses a process for co-processing copper slag and fly ash by using steelmaking refining slag, which comprises the following steps: mixing fly ash generated by a coking plant with copper slag for pelletizing, adding pellets with the diameter of 5-20mm into the refining slag, and carrying out co-processing on the copper slag and the fly ash by using physical heat and high-alkalinity mineral structure of the steelmaking refining slag, heavy metal elements in the copper slag are reduced and recycled to serve as raw materials of the iron and steel industry for resource utilization, arsenic compounds in the alkaline steel slag and the copper slag react to form calcium arsenate, harmless conversion of harmful components in the copper slag is achieved, meanwhile, the technology optimizes the technological structure of the refining slag, the risk in the resource utilization process of the refining slag is reduced, and the economic benefit is increased. And economic benefits and environmental protection benefits are huge.

The invention discloses a method for recycling precipitation residues produced in the copper anode electrolytic refining process, and relates to the technical field of copper anode electrolytic refining. According to the method, the precipitation slag containing arsenic, tin, nickel, antimony and copper is treated, the physically entrained electrolyte is removed through water washing, most of copper, tin, antimony and the like are separated through a simple and low-cost flotation process, the obtained flotation copper concentrate is subjected to alkali liquor leaching to remove arsenic, antimony and tin, and the flotation effect is good. The leaching liquid is subjected to oxidative hydrolysis to remove antimony, and then calcium stannate slag and calcium arsenate slag are obtained through fractional precipitation of lime. The recycling method provided by the invention is low in cost, and resource utilization of arsenic, tin, antimony, nickel and copper can be realized.

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 invention belongs to the technical field of dressing and smelting solid waste treatment, and particularly relates to a post-treatment method of an antimony-containing adsorbent desorption solution. According to the post-treatment method of the antimony-containing adsorbent desorption solution, the arsenic slag is leached by the desorption solution, and the arsenic slag contains calcium hydroxide, so that compared with direct addition of liquid caustic soda, the dosage of the liquid caustic soda can be greatly reduced, the content of sodium ions in the desorption solution cannot be increased, and enrichment of the sodium ions in the desorption solution is reduced. Meanwhile, the secondary arsenic precipitation slag serves as the arsenic slag and is leached through the antimony-containing adsorbent desorption solution, As < 5 + > in the antimony-containing adsorbent desorption solution can react with calcium hydroxide which is not completely reacted in the secondary arsenic precipitation slag to generate calcium arsenate and sodium hydroxide, the arsenic content in the arsenic slag is increased, meanwhile, the pH value of the solution is increased, and the use amount of liquid caustic soda is reduced. Moreover, the mode of leaching the secondary arsenic precipitation slag can also wash off the liquid caustic soda physically adsorbed in the secondary arsenic precipitation slag, so that the dosage of the liquid caustic soda is further reduced.

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.

The application discloses an antitumor composition of arsenic trioxide and artesunate for enhancing the drug efficacy of arsenic trioxide, and discloses GA modified pH responsive arsenic trioxide-artesunate double-drug nanoliposome including the composition, the double-drug nanoliposome including glycyrrhetinic acid-polyethylene glycol-hydrazone-distearyphosphatidyl ethanolamine polymer, cholesterol, artesunate and calcium arsenate nanoparticles; the glycyrrhetinic acid-polyethylene glycol-hydrazone-distearyphosphatidyl ethanolamine and cholesterol form nanoliposome, and the nanoliposome is loaded with artesunate and calcium arsenate nanoparticles; the calcium arsenate nanoparticles contain arsenic trioxide, and a preparation method and application in preparing antitumor drugs are disclosed. The application first co-loads the highly toxic traditional Chinese medicine arsenic trioxide and artesunate to play a synergistic effect, realizes the attenuation and efficiency enhancement of arsenic trioxide through targeted modification delivery and tumor microenvironment response release, and has a good clinical application prospect.

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 application belongs to the field of arsenic pollution treatment, and more particularly relates to a method for enhanced treatment of acidic arsenic-containing wastewater. The application provides a method for carbonate mineral enhanced crystallization treatment of acidic arsenic-containing wastewater, which is based on the structural compatibility between carbonate minerals and calcium arsenite minerals, and uses the interface effect of carbonate minerals to induce the epitaxial crystallization of calcium arsenite minerals into minerals. Compared with the technical method without carbonate mineral induction, the Ca-As(III) product obtained by the technical solution has better crystallinity, larger crystal size and lower solubility, so that the removal of As(III) in the wastewater can be enhanced.

The invention discloses an arsenic-containing wastewater treatment method and system, and belongs to the technical field of wastewater treatment. A two-stage'hydrogen peroxide and ferrite 'arsenic removal treatment method is adopted, lime is added into the wastewater firstly, the pH of the wastewater is increased, and calcium arsenite and calcium arsenate salt precipitates are generated through reaction of calcium ions and arsenic in water; the method comprises the following steps of: adding ferrous salt and hydrogen peroxide into wastewater, oxidizing most of Fe < 2 + > in the wastewater into Fe < 3 + > and As < 3 + > into As < 5 + > through sufficient aeration oxidation to generate calcium arsenate / iron and calcium arsenate / iron slag precipitates with lower solubility, removing arsenic through filtration, and discharging after reaching the standard. The method is low in operation cost, convenient to operate, easy to implement, environmentally friendly and free of secondary pollution. According to the invention, the precipitation efficiency, the arsenic removal stability and the standard-reaching rate of water quality are greatly improved, the environmental protection pressure of enterprises is effectively reduced, the environment is better protected, and the method has great social, economic and environmental significance.