8 results about "ARSENATE ION" patented technology

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a pretreatment method for improving the leaching rate and the carbon adsorption rate of high-sulfur-arsenic gold ore. Comprising the following steps that the high-sulfur-arsenic gold ore is ground and then prepared into ore pulp; a green oxygen activating agent and hydrogen peroxide are sequentially added into the ore pulp, oxidation pretreatment is conducted on the high-sulfur-arsenic gold ore, ore pulp activating liquid is formed, and the green oxygen activating agent is a mixture of calcium oxide, sodium persulfate and soluble bivalent iron salt; and adding a gold leaching agent into the ore pulp activation solution, adjusting the pH value of the ore pulp to 9-12, carrying out stirring gold leaching treatment, filtering to obtain a leaching solution, and then adding activated carbon to adsorb and extract gold. According to the method, a stronger oxidation environment is provided, meanwhile, the residual concentration of arsenate radicals in the solution is effectively reduced, the leaching rate of gold and the adsorption rate of activated carbon are greatly increased, excellent oxidation performance and environment friendliness are shown, and a more sustainable high-sulfur-arsenic gold ore pretreatment process is provided.

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.

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.

This application provides an electrolyte, a sodium metal battery cell, a battery device, and an electrical device. The sodium metal battery cell includes an electrolyte comprising an electrolyte salt, a non-fluorinated chain ether solvent, and a metal ion additive. The concentration of the electrolyte salt is 0.5 mol / L to 1.5 mol / L, and the concentration of the metal ion additive is greater than 0.0005 mol / L and less than 1.0 mol / L. The cations of the metal ion additive include alkali metal ions other than sodium or alkaline earth metal ions. The anions of the metal ion additive include one or more of sulfate, acetate, formate, phosphate, oxalate, borate, citrate, niobate, tetrafluoroborate, difluorooxaloborate, perchlorate, hexafluorophosphate, trifluoromethanesulfonate, iodate, bis(fluorosulfonyl)imide, arsenate, carbonate, or tantalate, thereby providing improved high-temperature storage performance.

The invention discloses a method for deeply purifying and removing impurities before flue gas desulfurization of an industrial furnace, which comprises the following steps: introducing sulfur-containing flue gas subjected to dust removal treatment into a wet washing tower; washing the sulfur-containing flue gas with a soluble metal salt solution to form a dilute sulfuric acid solution containing metal salt as an absorption solution; the obtained absorption liquid is in contact with the treated flue gas to be hydrolyzed, arsenic chloride, hydrogen chloride and lead chloride in the flue gas are converted into arsenate, lead ions and chloride ion soluble salt, the arsenate and metal cations in the absorption liquid are subjected to insoluble arsenate precipitation, and the treated flue gas is the purified and impurity-removed high-sulfur flue gas. By means of the method, arsenic, volatile inorganic matter and other pollutants in the sulfur-containing flue gas can be effectively removed and prevented from entering a subsequent desulfurization system, and the concentration of arsenic, chlorine and other pollutants in desulfurization products is effectively reduced.

The invention relates to a method for producing scorodite from a solution comprising arsenic and sulfuric acid without the use of a neutralizing agent, comprising the following steps: i. Subjecting a first arsenic solution comprising arsenic and sulfuric acid in the form of a mixture of arsenite ions and arsenate ions to an oxidation treatment, oxidizing the arsenite ions into arsenate ions, a second arsenic solution is obtained; ii, adding a first solution containing ferrous ions into the second arsenic solution to generate a third arsenic solution; iii. Adding a first portion of magnetite to the third arsenic solution to adjust the molar ratio of iron ions to arsenate ions to 0.3-1 to generate a first arsenic slurry; iv. Adding to the first arsenic slurry a portion of the scorodite slurry recycled from step viii as a nucleation matrix for scorodite particles, obtaining a first scorodite slurry of from 2% w / w to 15% w / w; v, heating the first scorodite slurry to 80 DEG C to 90 DEG C; vi, the first scorodite slurry is kept at the temperature of 80 DEG C to 90 DEG C for 5 h to 48 h, and second scorodite slurry is obtained; vii, conveying the second scorodite slurry to a solid-liquid separation step to obtain third scorodite slurry and a treated solution; viii. Recycling a first portion of the third scorodite slurry to step iv; and (ix) filtering a second portion of the third scorodite slurry.

This invention proposes an online monitoring method for total arsenic in water, comprising the following steps: mixing a water sample with a potassium persulfate aqueous solution and heating to digest it, oxidizing all forms of arsenic to pentavalent arsenic; adding sulfuric acid and tartaric acid to the digestion solution to adjust the pH to 12, and adding ascorbic acid and potassium iodide to complex copper ions, adding potassium borohydride to generate arsine, and purging with air to remove the arsine; introducing the arsine into an iodine and potassium iodide aqueous solution to oxidize it to arsenate, then adding ammonium molybdate to generate arsine molybdenum heteropolyacid, and again adding ascorbic acid and potassium iodide to reduce it to molybdenum blue; measuring the absorbance and plotting a standard curve to calculate the total arsenic content. By using an iodine-potassium iodide solution as the arsine absorption solution, the absorption efficiency and stability are superior to conventional acidic potassium permanganate solution; simultaneously, tartaric acid masks antimony ions, and ascorbic acid and potassium iodide synergistically complex copper ions, effectively eliminating Sb. 3+ / Cu 2+ Interference can be eliminated to achieve accurate online monitoring of total arsenic in water.

Compounds of structure (I) are described wherein, R1, R2, R1a and R2a are independently selected from H, nitro, cyano, and an alkylsulfonyl, wherein at least two of R1, R2, R1a and R2a are independently selected from nitro, cyano, and an alkylsulfonyl, and X− is not a halide, tosylate, trifluoromethylsulfonate, tetrafluoroborate, an aryl-substituted borates, hexafluorophosphate, hexafluoroarsenate, acetate, trifluoroacetate, methane sulfonate, C-2 to C-20 linear unsubstituted alkyl sulfonates, naphthalenesulfonate, and camphorsulfonate. Also described are EUV negative and positive chemically amplified photoresist compostions containing said compound and the process of using these photoresist to pattern a substrate.