24 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.

An electrolyte membrane for a battery that cycles lithium ions includes a sulfide-based solid electrolyte, a polymer binder, an inorganic filler, an inorganic lithium salt, and an ionic liquid. The sulfide-based solid electrolyte includes lithium sulfide (Li2S) and at least one element selected from the group consisting of phosphorus (P), tin (Sn), silicon (Si), germanium (Ge), boron (B), gallium (Ga), and aluminum (Al). The ionic liquid includes substantially equimolar amounts of a cation and an anion. The cation includes a complex of lithium (Li+) and an ethylene glycol dimethyl ether, an imidazolium ion, a piperidinium ion, a pyrrolidinium ion, an ammonium ion, a phosphonium ion, or a combination thereof. The anion includes an arsenate ion, a phosphate ion, a sulfonylimide ion, a borate ion, a chlorate ion, or a combination thereof.

The invention discloses a magnetic iron mineral and phosphate tailing material and application thereof in treatment of arsenic and cadmium pollution. A low-cost phosphate tailing material is taken as an object, and an environmental functional material loaded with magnetic gamma-Fe2O3 and other iron minerals is prepared by adopting a method of'rapid thermal activation-primary addition of a modifying agent-mineral phase conversion '. The magnetic iron mineral and phosphate tailing material can efficiently adsorb cadmium ions, arsenate ions and arsenite ions, has a synchronous adsorption effect on coexisting cadmium ions and inorganic arsenic, and can be used as an efficient passivation repair material for arsenic-cadmium combined polluted soil. The material also has magnetism, is easy to separate and recover, and also can be combined with a magnetic separation technology to serve as a material for synchronously removing arsenic and cadmium pollutants in a water body or soil.

The present invention discloses a method for stabilizing arsenic-containing residues by thermal stabilization of precipitated hydroarsenite, the method comprising the steps of: a first step of neutralization in which arsenic-containing wastewater is contacted with a first neutralizing agent to produce a first neutralized arsenic-containing wastewater; a second step of adjusting the Fe (III) / As (III) ratio, wherein the first neutralized arsenic-containing wastewater is mixed with a first iron solution to produce a third arsenic-containing wastewater; a third step of arsenic precipitation in which the pH of the third arsenic-containing wastewater is adjusted with a second neutralizer to produce a first arsenic-containing residue slurry; a fourth step of solid-liquid separation, wherein the first arsenic-containing residue slurry is separated to generate fourth arsenic-containing wastewater and a first arsenic-containing residue; a fifth step of calcining, wherein the first arsenic-containing residue is calcined to generate a second arsenic-containing residue; a sixth step of washing, wherein the second arsenic-containing residue is washed with an aqueous solution to generate a second arsenic-containing residue slurry; and a seventh step of solid-liquid separation, wherein the second arsenic-containing residue slurry is separated to produce a fifth arsenic-containing wastewater and a stable third arsenic-containing residue in the form of fisheyanite. The invention solves the technical problem of removing arsenic from arsenic-containing wastewater to produce stable arsenic-containing residues, and the synthesis of these arsenic-containing residues does not require an oxidation stage to oxidize arsenite ions into arsenate ions and does not require heating in a precipitation stage.

The present invention discloses a method for removing impurities from waste acid and fully recycling the waste acid. The method comprises the following steps: introducing hydrogen sulfide into the waste acid for a sulfidation reaction, removing arsenic sulfide and mercuric sulfide precipitates formed during the reaction; continuing to introduce hydrogen sulfide for a step-by-step sulfidation reaction, adding an iron-containing substance to adjust the reaction pH and ORP, and recovering the copper, lead, and zinc sulfide slag precipitates formed during the reaction in a step-by-step manner; adding an iron-containing substance for a neutralization reaction, controlling the pH and ORP, promoting the reaction between iron ions and arsenate, and removing the ferric arsenate precipitate formed during the reaction; adding an adsorbent for an adsorption reaction, and removing fluorine-containing and thallium-containing components by adsorption; introducing an oxidant for an oxidative hydrolysis reaction, controlling the degree of hydrolysis, and preparing polyferric sulfate. The present invention utilizes the iron-containing substance to remove impurities from waste acid, thereby achieving deep impurity removal and full resource utilization of waste acid.

An electrolyte for a lithium-ion cyclizing battery comprises a glycerol-based ionic liquid and an ammonium-based cyclic ionic liquid. The glycerol-based ionic liquid essentially comprises equimolar amounts of a cation component, consisting of a lithium (Li+)-glycerol complex, and an anion component, consisting of an arsenate ion, a phosphate ion, a sulfonylimide ion, a borate ion, and / or a chlorate ion. The ammonium-based cyclic ionic liquid comprises a cation component, consisting of a piperidinium ion and / or a pyrrolidinium ion, and an anion component, consisting of an arsenate ion, a phosphate ion, a sulfonylimide ion, a borate ion, and / or a chlorate ion. The electrolyte has a lithium concentration greater than or equal to 0.2 mol per liter and less than or equal to 1.6 mol per liter.The electrolyte can be used in batteries that cycle lithium ions and include silicon-containing electroactive materials of the negative electrode.

An electrolyte membrane for a lithium-ion cycling battery contains a sulfide-based solid electrolyte, a polymer binder, an inorganic filler, an inorganic lithium salt, and an ionic liquid. The sulfide-based solid electrolyte contains lithium sulfide (Li₂S) and at least one element from the group consisting of phosphorus (P), tin (Sn), silicon (Si), germanium (Ge), boron (B), gallium (Ga), and aluminum (Al). The ionic liquid contains substantially equimolar amounts of a cation and an anion. The cation comprises a complex of lithium (Li⁺) and an ethylene glycol dimethyl ether, an imidazolium ion, a piperidinium ion, a pyrrolidinium ion, an ammonium ion, a phosphonium ion, or a combination thereof. The anion comprises an arsenate ion, a phosphate ion, a sulfonylimide ion, a borate ion, a chlorate ion, or a combination thereof.

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 present invention relates to a composite precipitant for removing phosphate or arsenate pollution from water, and a preparation method and a use method thereof. The composite precipitant for removing phosphate or arsenate pollution from water comprises a precipitant A and a precipitant B, wherein the precipitant A comprises an ammonium salt solution and a strong acid solution; the ammonium salt is selected from at least one of ammonium nitrate, ammonium sulfate, ammonium chloride, and ammonium molybdate, and the strong acid is selected from at least one of nitric acid, sulfuric acid, and hydrochloric acid; the precipitant B comprises a solution prepared by a surfactant, and the surfactant is preferably at least one of a sulfonate, a quaternary ammonium salt, and a halogen salt. The composite precipitant of the present invention has excellent selectivity, anti-interference ability, and deep removal performance for phosphate or arsenate pollutants.

An electrolyte for a battery that cycles lithium ions includes a glyme-based ionic liquid and a cyclic ammonium-based ionic liquid. The glyme-based ionic liquid includes substantially equimolar amounts of a cation component including a complex of lithium (Li+) and a glyme and an anion component including an arsenate ion, a phosphate ion, a sulfonylimide ion, a borate ion, and / or a chlorate ion. The cyclic ammonium-based ionic liquid includes a cation component including a piperidinium ion and / or a pyrrolidinium ion and an anion component including an arsenate ion, a phosphate ion, a sulfonylimide ion, a borate ion, and / or a chlorate ion. The electrolyte has a lithium concentration of greater than or equal to 0.2 moles per liter and less than or equal to 1.6 moles per liter. The electrolyte may be used in batteries that cycle lithium ions and that include silicon-containing electroactive negative electrode materials.

The invention provides an iron-modified silicon-calcium-based mineral material and application of the iron-modified silicon-calcium-based mineral material in passivating and repairing cadmium and arsenic pollution. According to the technical scheme disclosed by the invention, high-temperature slag of a yellow phosphorus production process is selected as a silicon-calcium-based mineral raw material, and the silicon-calcium-based mineral material loaded with spherical nanoscale iron minerals is prepared through the steps of ferric salt dipping, alkali liquor dropwise adding, natural settling, thermal reaction and cleaning. According to the mineral loading modification scheme, the adsorption capacity of the material to cadmium ions, arsenate ions and arsenite ions is remarkably improved at the same time, and the disclosed iron-modified silicon-calcium-based mineral material can adsorb cadmium and arsenic pollutants at the same time and can be used for removing the cadmium ions, the arsenate ions or (and) the arsenite ions in a water body; and the silicon-calcium-based waste can also be used as a passivation repair material for treating cadmium and arsenic pollution of a soil environment, and the application way of the silicon-calcium-based waste is expanded.

The invention discloses a method for preparing a soil remediation agent containing arsenic and multiple metals co-contaminated, comprising the following steps: dissolving ferrous sulfate in water to obtain Fe 2+ A ferrous sulfate solution with a concentration of 20 to 30 g / L; adding hydrogen peroxide to the ferrous sulfate solution, and maintaining the pH value at 2 to 4 during the addition process, wherein the hydrogen peroxide and the Fe 2+ The molar concentration ratio is 1:(0.8-1.5); the pH value of the mixed solution obtained in the mineralization step is adjusted to 6-8, and the mixture is evenly stirred and then filtered by plate and frame; the filter cake obtained in the adjustment step is dried to obtain Schmidt mineral, and the Schmidt mineral is evenly mixed with calcium carbonate in a mass ratio of 1:(0.5-2) to obtain an arsenic-containing multi-metal co-contaminated soil remediation agent. The present invention also discloses an arsenic-containing multi-metal co-contaminated soil remediation agent prepared by the above preparation method and its application in remediating arsenic-containing multi-metal co-contaminated soil. The soil remediation agent of the present invention effectively adsorbs and fixes arsenate ions and metal cations such as cadmium in the soil, which is beneficial to the recovery of the soil ecosystem.

The invention discloses a method for determining the distribution concentration of arsenate in soil solid-liquid phases, and belongs to the field of soil pollution analysis. The invention is based on a surface coordination model calculation method for the chemical equilibrium of arsenate in an aqueous solution and the distribution equilibrium in soil solid-liquid phases, performs soil pretreatment by different experimental methods, and constructs a thermodynamic equilibrium model for the adsorption and distribution of As(V) in a soil system by screening multiple groups of model architecture prediction results. At the same time, a batch adsorption test is carried out on the soil for verification, and the distribution concentration of As(V) in soil solid-liquid phases can be effectively predicted, so as to provide a reference for soil heavy metal ecological risk assessment and soil pollution control.

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 relates to multifunctional integrated hydrotalcite (MgAlEu-LDH) which has the capabilities of efficient adsorption, oxidation repair and real-time monitoring of heavy metal pollution. According to the material, the adsorption selectivity is enhanced by introducing rare earth element europium (Eu < 3 + >), a dual mechanism of'coordination adsorption-photocatalytic oxidation 'is realized by utilizing the photocatalytic characteristic of the material, and an ultra-stable mineralization structure is constructed. The preparation method comprises the following steps: weighing magnesium chloride, aluminum chloride and europium chloride according to a molar ratio of 2: 1: 0.1 to prepare a salt solution, reacting the salt solution with an alkali solution in a colloid mill, aging, washing and drying to obtain MgAlEu-LDH, and calcining at 350 DEG C to obtain MgAlEu-LDH. The fluorescence characteristic of Eu < 3 + > can be used for monitoring the adsorption process in situ in real time, and the fluorescence intensity of Eu < 3 + > is quenched along with the increase of arsenite adsorption time. Experiments show that the material is high in arsenic adsorption rate, the adsorption process conforms to a Langmuir model, the fluorescence intensity change is related to the adsorption process, and an economic and environment-friendly technical scheme is provided for heavy metal pollution remediation.

The invention belongs to the technical field of hydrometallurgy and resource recovery, and particularly relates to a waste acid rhenium supernormal enrichment method based on primary arsenic sulfide colloid. The method comprises the following steps: 1) recovering the metal smelting waste acid, filtering to remove suspended matters, sequentially adding an arsenic source and a sulfur source under an acidic condition, and stirring to generate primary arsenic sulfide colloid; 2) carrying out heating reaction on the primary arsenic sulfide colloid, and stirring until a turbid solution is formed; and (3) putting the filtered and separated rhenium-rich vulcanized filter residues and alkali liquor into a high-pressure reaction kettle together, preferentially dissolving out rhenium in the form of ReO4 <-> into a leaching solution through oxygen pressure leaching, and recovering the ReO4 <-> in the leaching solution through an extraction or ion exchange method to obtain an ammonium rhenate product. The method has very important significance on recovery and enrichment of rhenium in the metal waste acid, the rhenium recovery rate limit can reach almost 99.9%, the rhenium element with extremely high value can return to an industrial chain again, direct discharge pollution of the waste acid is reduced, economic benefits are improved, and meanwhile interference of arsenate ions in the waste acid is remarkably inhibited.

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.

The invention relates to a method for repairing arsenic-polluted soil. The method comprises the following steps that S1, a first positive electrode and a first negative electrode are inserted outside a to-be-repaired soil area; an electrolyte is applied to the soil area around the negative electrode; the first positive electrode and the first negative electrode are communicated with a power supply; after electrifying for 10 to 14 hours, standing for 10 to 14 hours; s2, exchanging electrodes; continuously electrifying for 10 to 14 hours, and standing for 10 to 14 hours; s3, detecting the content of pentavalent arsenic in the soil, and if the content is less than 85%, repeating the steps S1 and S2; and if the concentration is greater than 85%, removing the No.1 positive electrode and the No.1 negative electrode, and inserting the No.2 positive electrode and the No.2 negative electrode at the original electrode position. According to the method, the oxidizing agent is injected into the soil through electroosmosis, and trivalent arsenic in the soil is oxidized into pentavalent arsenic easy to stabilize; ferrous ions are introduced into the soil by utilizing the sacrificial positive iron electrode and are subjected to adsorption-precipitation reaction with arsenite and arsenate, so that the aim of stabilizing the arsenic-polluted soil is fulfilled.

The invention provides an electrolyte of a battery pack for circulating lithium ions. The electrolyte comprises ethylene glycol dimethyl ether ionic liquid and cyclic ammonium ionic liquid. The ethylene glycol dimethyl ether ionic liquid comprises a cation component and an anion component which are basically equal in molar weight, the cation component comprises a complex of lithium (Li < + >) and ethylene glycol dimethyl ether, and the anion component comprises arsenate ions, phosphate ions, sulfimide ions, borate ions and / or chlorate ions. The cyclic ammonium ionic liquid comprises a cation component, wherein the cation component comprises piperidinium ions and / or pyrrolidinium ions; and an anionic component comprising arsenate ions, phosphate ions, sulfimide ions, borate ions, and / or chlorate ions. The electrolyte has a lithium concentration greater than or equal to 0.2 mol / L and less than or equal to 1.6 mol / L. The electrolyte can be used in batteries that cycle lithium ions and include silicon-containing electroactive negative electrode materials.

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.

The invention discloses an electrolyte membrane for a lithium ion cycling battery and a manufacturing method thereof. An electrolyte membrane for a battery that circulates lithium ions includes a sulfide-based solid electrolyte, a polymer binder, an inorganic filler, an inorganic lithium salt, and an ionic liquid. The sulfide-based solid electrolyte contains lithium sulfide (Li2S) and at least one element selected from the group consisting of phosphorus (P), tin (Sn), silicon (Si), germanium (Ge), boron (B), gallium (Ga), and aluminum (Al). The ionic liquid comprises substantially equimolar amounts of cations and anions. The cations include a complex of lithium (Li +) and ethylene glycol dimethyl ether, an imidazolium ion, a piperidinium ion, a pyrrolidinium ion, an ammonium ion, a phosphonium ion, or a combination thereof. The anions include arsenate ions, phosphate ions, sulfimide ions, borate ions, chlorate ions, or a combination thereof.