42 results about "Calcium arsenite" patented technology

The invention relates to a method for precipitating pentavalent calcium arsenate from an acidic solution, in which arsenic is at least partially in trivalent form. The acidic solution is neutralised before being routed to an arsenic oxidation stage,and a poorly soluble calcium-arsenic compound is precipitated from the solution, in which all the arsenic is pentavalent.

The invention discloses a compound technology for removing, Sb, Bi by utilizing copper electrolyte. A process for removing As by means of solvent extraction and a process of removing Sb and Bi by means of solution self-purification are combined; copper arsenite crystals are prepared by As in a back-extraction solution and is used as a high arsenic electrolytic additive; during high arsenic electrolysis, Sb and Bi in the solution can be effectively removed through As (III), and a majority of Sb and Bi in an anode plate enter anode mud. According to the compound technology, the aims of removing As, Sb and Bi can be fulfilled; meanwhile, an electro-deposition induced decoppering and dearsenification method is eliminated in the main process, and a small quantity of nickel removal liquid in the auxiliary process needs to be subjected to electro-deposition treatment. The compound technology is low in power consumption; the amount of H3As gas, black copper plates and black copper powder is obviously reduced; a dearsenification product is sold in a form of As2O3 or stacked in a form of calcium arsenate. According to the method, the operating environment is optimized, the defects that the As removal product contains a large amount of copper in the electro-deposition induced decoppering and dearsenification method and needs to be returned to a pyrogenic process system for separating copper and arsenic are overcome; the electro-deposition during the main impurity removal process is avoided, and the energy consumption is obviously reduced.

The invention relates to a preparing method for high-stability solid arsenic mineral. A high-arsenic containing solution is subjected to arsenic removal and is cured, and the arsenic containing solution is subjected to harmless treatment. After trivalent arsenic in the arsenic containing solution is converted into pentavalent arsenic through catalytic oxidation, after oxidization, liquid is synthesized into the high-stability solid arsenic mineral through combination of the lime arsenic deposition method and one of the distribution crystallization method, the regulation and control growth method and the hydrothermal method, and the solid arsenic mineral can be directly stacked. Calcium arsenate is obtained through the lime arsenic deposition method firstly and then is converted into the high-stability solid arsenic mineral through one of the distribution crystallization method, the regulation and control growth method and the hydrothermal method, and toxicity leaching conforms to the GB5085.3-2007(solid waste distinguishing standard-leaching toxicity identification) rule. According to the preparing method, the technology process is short, the arsenic deposition effect is good, the liquid can be directly discharged after arsenic deposition, and the synthesized solid arsenic mineral is high in stability and can be stably stacked within the wide pH value range of 2-11 and under the strong reducing condition.

The invention belongs to the field of chemical engineering, and discloses a method for efficiently separating copper arsenic in arsenic matte. The method includes the steps: (1) crushing the arsenic matte, grinding the crushed arsenic matte, and screening the grinded arsenic matte to obtain arsenic matte powder; (2) oxygen pressure leaching: performing oxygen pressure leaching on the arsenic mattepowder by the aid of sulfuric acid solution and Cu2<+> ions, and performing liquid solid separation after leaching is completed to obtain copper-containing leaching solution and lead-silver-containing leaching slag; (3) depositing the copper arsenic in the leaching solution, and performing alkaline leaching on copper arsenic slag to obtain alkaline leaching copper slag and high-arsenic-containing alkaline leaching solution; (4) fine lime arsenic depositing: adding fine lime into the alkaline leaching solution acquired in the step (3) to deposit the arsenic to obtain calcium arsenate. The method is simple in process and free from pollution, a works can not directly contact with harm of generated arsenide hydrogen in the production process, environments cannot be polluted, and precious metals such as copper, lead and silver in lead matte can be effectively recycled.

The invention relates to a comprehensive recovery method for complicated materials containing arsenic and valuable metal slag dust, which comprises the following steps of: treating various arsenic-containing materials into a primary rotary kiln to volatilize the arsenic, and treating the materials into a secondary rotary kiln for purifying the arsenic to produce arsenic products containing 99.5 percent of As2O3; carrying out reduction melting on primary and secondary rotary kiln slag through a blast volatilization furnace, returning produced high-arsenic smoke dust back into the primary rotary kiln for treatment, using furnace slag as cement plant raw materials and zinc raw materials for carrying out resource treatment after the forced reduction arsenic removal and zinc volatilization through a fuming furnace, carrying out alkaline oxidation refining treatment on produced arsenic containing alloy, recovering lead, antimony, bismuth, silver and the like in the arsenic removal alloy according to the conventional method, carrying out crushing alkali dissolution and filtering on refined alkali slag with 5 to 15 percent of As2O3 and about 5 to 15 percent of valuable metal content, returning slag back into the blast volatilization furnace to be treated, introducing CO2 into tin and arsenic containing solution for precipitating the arsenic, using filtered stannic oxide as high-tin raw materials to be sold, carrying out arsenic precipitating and filtering through adding Ca(OH)2 into arsenic containing filter liquor, returning calcium arsenate slag back into the primary rotary kilnfor treatment after the filtration, and evaporating and concentrating the rest alkali liquid for recovering the alkali. The whole technical process of the method provided by the invention is simple and smooth, economic benefits and environment benefits are very obvious.

The invention discloses a method for separating arsenic and selenium from copper anode slime alkaline leach liquor. The method comprises the following steps: 1) oxidation, namely adding an oxidizing agent or introducing oxidizing gas into the copper anode slime alkaline leach liquor, so that oxidized copper anode slime alkaline leach liquor is obtained; 2) arsenic precipitation, namely adding a calcium salt into the oxidized copper anode slime alkaline leach liquor, stirring the obtained mixture so as to produce a precipitate, and carrying out filtration and separation on the precipitate so as to obtain a calcium arsenate precipitate and arsenic post-precipitation liquid; and 3) selenium precipitation, namely adding a barium salt into the arsenic post-precipitation liquid obtained in the step 2), stirring the obtained mixture so as to produce a precipitate, carrying out filtration and separation on the precipitate so as to obtain a barium selenate precipitate and selenium post-precipitation liquid, and carrying out evaporative crystallization on the selenium post-precipitation liquid so as to recycle alkali, or directly returning to a leaching process. The method disclosed by the invention is short in technological process, less in equipment and simple in operation, and can be used for realizing the separation and enrichment of arsenic and selenium, the precipitation rate of arsenic is higher than 96%, and the precipitation rate of selenium is higher than 99%; by virtue of carrying out evaporative crystallization on a solution for recycling or directly returning the solution to a leaching process, the recovery of alkali is realized.

The invention relates to a chemical agent for preventing arsenic spreading pollution in arsenic-resistant plants. The chemical agent comprises the following components in percentages by mass: fulvic acid 3.2%-4.8%, inositol 0.2%-0.8% and calcium acetate 94.4%-96.6%, wherein the fulvic acid is a leaf diffuser; the inositol is a catalyst; and the calcium acetate is a main reaction substance. The invention further relates to a using method of the chemical agent. The using method comprises the following steps: laying arsenic-containing tailings or waste residues and spreading borrowed soil and a base fertilizer, after planting ciliate desert-grass, spraying the chemical agent to stems and leaves every 15-30 days, harvesting for the first time after the ciliate desert-grass grows for a period of time, harvesting again at set intervals, and remaining stubbles and turning and digging soil between the plants after harvesting every time. The calcium-containing chemical agent is sprayed on the arsenic-resistant plants, and reacts with an arsenic substance to generate calcium arsenate, thus, insects die due to acute poisoning after eating the stems and leaves of the plants, arsenic-containingdead bodies drop to tailings ground surrounding the plants, are turned into soil, and are absorbed by the plants again, and an effect of greatly reducing outward diffusion of arsenic is achieved.

The invention relates to a method for preparing high-stability solid arsenic minerals through a distributed crystallization method. The method comprises the following steps: removing arsenic from a high-arsenic-content solution and curing the solution, so as to carry out harmless treatment on the arsenic-containing solution. According to the method disclosed by the invention, trivalent arsenic in the arsenic-containing solution is catalytically oxidized into pentavalent arsenic; and the oxidized solution is synthesized into the high-stability solid arsenic minerals through a lime arsenic settling method and the distributed crystallization method, and the high-stability solid arsenic minerals can be directly stockpiled. Calcium arsenate is obtained firstly through the lime arsenic settling method, and then the calcium arsenate is turned into the high-stability solid arsenic minerals through the distributed crystallization method; and toxicity extraction meets the specifications of GB5085.3-2007 (solid waste authentication standard-extraction toxicity authentication). The method is short in technological flow and good in arsenic settling effect; the solution subjected to arsenic settling can be directly discharged, and the synthesized solid arsenic minerals are high in stability and can be stably stockpiled within a wide pH range of 2 to 11 and under a strong reducing property condition.

The invention discloses a stabilized treatment method for realgar tailing residues. The stabilized treatment method for the realgar tailing residues comprises the following steps of (1) crushing the realgar tailing residues, adding water inside, uniformly stirring, and carrying out first-stage microwave treatment under the action of a microwave field at the power ranging from 100W to 300W; (2) adding water and ferrous salt inside, uniformly stirring, feeding air or oxygen, and meanwhile, carrying out second-stage microwave treatment under the action of a microwave field at the power ranging from 300W to 500W; and (3) carrying out third-stage microwave treatment under the action of a microwave field at the power ranging from 500W to 700W, so that the stabilization of the realgar tailing residues is realized. According to the stabilized treatment method for the realgar tailing residues provided by the invention, through designing a whole process technology of the method, especially improving parameters and conditions of a key microwave treatment process, and dissolving, oxidizing and stabilizing the realgar tailing residues for three stages, the problems of slow calcium arsenate dissolution rate, slow arsenic sulfide oxidation rate and insufficient product long-time stability can be effectively solved.

The invention discloses a method for treating arsenic-containing wastewater and solidifying arsenic. First, the arsenic in the arsenic-containing wastewater is separated and enriched in the form of calcium arsenate or / and calcium arsenite precipitation, and then the obtained arsenic enrichment Oxidation in ferric sulfate or ferrous sulfate solution, through normal pressure reaction or pressurized hydrothermal reaction or normal pressure hydrothermal reaction, the arsenic in it is solidified in the form of scorodite crystals, and the obtained scorodite crystal grains Complete development, uniform distribution, stable structure under acidic conditions. The invention has the advantages of high operation efficiency, good arsenic fixation effect, convenient operation, low arsenic solidification treatment cost, etc., and is suitable for industrial application of harmless treatment of arsenic-containing wastewater.

The invention discloses a separation method for antimony and arsenic in an antimony and arsenic material. The separation method comprises the following steps of uniformly mixing the antimony and arsenic material with sodium peroxide, calcining the mixture at 300-390 DEG C, adding water into the calcined product, stirring the calcined product, leaching the calcined product at 50-65 DEG C, filteringthe calcined product after leaching to obtain a lixivium; and adding calcium oxide into the lixivium, stirring the lixivium at a constant temperature, filtering the lixivium after full reaction to obtain filter residues and filtrate, and drying the filter residues to obtain a calcium arsenate product. By taking sodium peroxide as a primary raw material, the calcining temperature is relatively low, antimony and arsenic are prevented from being volatilized in the calcining process, and the antimony and arsenic recovery rates in later period are relatively high. Sodium peroxide which replaces sodium nitrate is taken as an oxidant, so that the material is oxidized more fully without generating oxynitride, and the environment is not polluted. As alkali is not added, the raw materials are low in cost and equipment is not corroded.