31results about How to "Achieving selective leaching" patented technology

The invention discloses a wet-process cleaning treatment method of a lead plaster. The method comprises the following steps that an acetate solution is taken as a coordination leaching agent to carryout coordination leaching on the lead plaster to obtain lead-containing leachate and leached residues; the leachate is used for extracting the lead by adopting a diaphragm electrodeposition technologywithout purifying; after the diaphragm electrolysis is completed, an negative electrode obtains more than 99.9% or above of the lead, an anode liquid and a cathode electrolysis barren solution can becombined and can be returned to serve as the coordination leaching agent, so that a closed cycle of a technological process is realized; according to the method, the lead plaster in a waste lead-acidstorage battery can be carried out efficient cleaning treatment, an electric lead product with relatively high purity can be directly obtained, and sulfur in the lead plaster is fixed in the leachingslag by a form of insoluble sulfate; according to the method, the technical scheme has the outstanding advantages of being high in raw material adaptability, simple in the technological process, highin valuable element recovery rate, clean and environment-friendly.

The invention provides a high-iron low-grade nickel sulfide ore selective biological leaching process. The process comprises the following steps of stirring and leaching, selective leaching, deironing, extraction, reverse extraction and electrodeposition, then obtaining a cathode nickel. According to the process, in particular with respect to a flotation nickel sulfide ore concentrate with high iron content and low nickel grade, a stirring biological leaching process is adopted, measures for controlling growth, pH value, temperature and ventilatory capacity of vulcanized bacteria are adopted,redox potential in the leaching process is controlled, dissolution of iron-containing sulfide minerals such as pyrite is effectively inhibited, and selective leaching of the nickel-containing sulfidemineral is realized. The process is short in procedure, simple in equipment, saving in investment, low in cost, free of pollution, high in valuable metal recovery rate and capable of treating low-grade nickel sulfide ore resources which cannot be treated by a pyrogenic process smelting process, utilization range of resources can be expanded, comprehensive recovery level of the nickel metal is improved, and economic benefits, social benefits and environmental benefits of the process is remarkable.

The invention relates to a method for separating copper from lead copper matte, and belongs to the field of the wet-process metallurgy of non-ferrous metal. In the method, the lead copper matte is subjected to oxygen pressure leaching by adopting an NH3-(NH4)2SO4 alkalescent composite system at the temperature of between 110 and 200 DEG C; copper and NH3 undergo a coordination chemical reaction to enter solution, and other metal sulfides are converted into oxides / hydroxides and a sulfur element, the oxides / hydroxides and the sulfur element; and the copper and gold and silver are reserved in leaching residues, and the leaching residues return to a pyrometallurgical lead refining system and are subjected to batching to recover valuable elements such as lead, noble metal, simple substance sulfur. In copper-ammonia coordination solution, copper sulfate enrichment solution is obtained by the selective extraction of LiX84I and reextraction, and qualified cathode electrolytic copper is obtained by the conventional electrodeposition process of copper sulfate. By the method, the copper can be separated from the lead copper matte in one step, and the method is simple in a process, high in recovery rate of valuable metal, less in discharge of waste gas, waste water and waste residues, environment-friendly, low in requirement on equipment materials and safe and reliable in actual operation.

The present invention provides a strain of Penicillium oxalicum SYJ-1, which is classified as Penicillium oxalicum (Penicillium oxalicum), and has been preserved in the General Microorganism Center of China Microbiological Culture Collection Management Committee on November 7, 2018. The preservation number is: CGMCC No. 16497. The Penicillium oxalicum of the present invention has a strong leaching effect on lithium cobalt oxide, an important component in waste lithium batteries, and can efficiently recycle lithium and part of cobalt at the same time under the condition of relatively high solid-liquid ratio, and is expected to achieve selective leaching. And to the common heavy metal Fe 2+ 、Ni 2+ , Mn 2+ 、Cu 2+ And lithium cobalt oxide has strong resistance, which further expands its application range. The invention provides excellent bacterial strain resources for the future development of bacterial agents that are resistant to heavy metals and efficiently recover cobalt and lithium in waste lithium batteries, and have great practical application significance.

The invention relates to a hydrometallurgy technology for separating copper and bismuth from bismuth matte produced by a bismuth pyrometallurgy system and obtaining qualified copper products and belongs to the field of nonferrous metals hydrometallurgy. Bismuth matte is crushed, ground, sieved to be below -80 meshes and sent to a leaching tank for acid oxidation leaching, a leaching liquid is purified by a purifying agent and subjected to conventional copper electro-deposition treatment sequentially, and national standard copper products are obtained; after enrichment, leaching residues containing valuable metals such as lead, silver, sulfur and the like return to a lead smelting system for recovery, purifying residues containing the bismuth return to a bismuth smelting system for recovery of the bismuth. The recovery rate of valuable metals such as the copper, the silver, the sulfur, the bismuth, the lead and the like is high, the investment is low, energy consumption is low, no pollution is caused, no three-wastes are produced, green production is realized, and current environmental protection requirements are completely met.

The invention discloses a method for preparing cobalt phosphate by separating cobalt lithium from lithium cobalt oxide in waste lithium batteries. The method comprises the following steps: 1) dismantling and stripping waste lithium batteries to obtain positive and negative active materials; 2) Calcining and grinding the positive and negative active materials to obtain a LiCoO2-containing powder material; 3) The LiCoO2-containing powder material is leached with a mixed leaching solution of H3PO4 and H2O2, and the obtained leaching solution is neutralized and solid-liquid separated , to obtain cobalt phosphate precipitate and lithium-containing solution. This method uses lithium cobalt oxide of typical waste lithium batteries as raw material, adopts roasting combined with leaching to effectively separate Co and Li, and recovers its high value-added cobalt to prepare cobalt phosphate (cobalt violet), realizing the recycling of lithium cobalt oxide in waste lithium batteries and exploit.

The invention discloses a method for directly separating nickel from copper by wet processing of low-grade nickel matte. The method includes subjecting the low-grade nickel matte to primary countercurrent leaching by sulfuric acid to obtain primary leaching liquor containing nickel, cobalt and iron and primary leaching residues with main ingredients of copper sulphate and precious metals; subjecting the low-grade nickel matte to secondary countercurrent leaching by the primary leaching liquor to obtain secondary leaching liquor containing nickel, cobalt and iron and secondary leaching residues; precipitating hydrogen sulfide gas produced after two times of leaching and the secondary leaching liquor to obtain iron-containing precipitation liquor and nickel-cobalt sulfide precipitation residues; finally, subjecting the precipitation liquor to high-temperature oxidation, hydrolysis and iron removal. The method has the advantages that the whole technological process makes the nickel and the cobalt directly separated from the precious metals and the copper, so that the drawbacks such as high loss of the cobalt, the nickel and the precious metals, high material circulation rate and highenergy consumption are avoided in a process of bessemerizing the low-grade nickel matte into high-grade nickel matte; the traditional technology of separating the nickel from the copper through high-matte grinding flotation is omitted, so that production energy consumption is reduced, and a recovery rate of the nickel, the copper, the cobalt and the precious metals is increased.

The invention discloses a method for recovering arsenic and valuable metals from arsenic-containing soot. The method is that arsenic-containing soot is leached by acid oxidation, arsenic, copper and zinc enter into solution, and bismuth, lead, antimony and tin enter into slag phase ; The leaching solution selectively reduces arsenic by sulfur dioxide gas and recovers arsenic in the form of arsenic trioxide, and the remaining copper and zinc-containing solution is sulfided and precipitated by hydrogen sulfide gas to obtain copper-enriched slag and zinc-containing solution; Concentrate and crystallize to obtain zinc sulfate heptahydrate product, and the crystallization mother liquor is returned to the leaching process of arsenic-containing soot; the method efficiently recovers arsenic in the arsenic-containing soot in the form of high-grade arsenic trioxide, and separates and recovers copper and zinc, and obtains lead, Bismuth, tin, antimony and other enriched slag are used as raw materials for lead smelting. In the whole production process, no industrial waste water is discharged, and no worthless hazardous waste is produced, which is beneficial to the comprehensive management of hazardous waste.

The invention relates to the field of wet metallurgy on nonferrous metal, in particular to a method for extracting nickel, cobalt and manganese from laterite-nickel ore.The method includes steps of crushing, grinding and sieving ore samples to obtain ore samples with the granularity of 0.074-0.15 mm under the control; dissolving chloride in hydrochloric acid to obtain hydrochloric acid and chloride solution; directly leaching the laterite-nickel ore by the aid of the hydrochloric acid and chloride solution, controlling the leaching temperatures and the leaching time, and filling the laterite-nickel ore with oxidizing gas from the bottom to enhance leaching of valuable metals and restrain leaching of contaminating metals.The method has the advantages that nickel and the cobalt which are the valuable metals can be leached, leaching of iron can be restrained, and accordingly loss of the nickel and the cobalt due to precipitates generated by the iron in leach liquor in follow-up working procedures can be prevented; the nickel leaching rate can reach 83% at least, the cobalt leaching rate can reach 72% at least, the manganese leaching rate can reach 89% at least, but the iron leaching rate is only 11-19%, and accordingly leaching of the iron can be reduced to a great extent.

The invention belongs to the technical field of circular economy, and specifically relates to a method for recovering metal indium in waste liquid crystal screens. The method uses waste liquid crystal screens as raw materials and undergoes dismantling, crushing, liquid crystal separation, acid leaching, extraction, stripping, and adjustment. Indium hydroxide is obtained in the pH value process; through supercritical acetone cleaning, fractionation, and selective leaching of metals, the pollution-free and efficient recovery of indium in waste liquid crystal screens is realized. The method of the invention has the characteristics of high efficiency, environmental protection and easy industrial production, and has remarkable economic, environmental and social benefits.

The invention provides an electrochemical method and equipment which can control a bioleaching process. In the bioleaching process, oxidation-reduction potential of a leaching system is controlled electrochemically, pH value is maintained to be basically constant, and rapid oxidation of pyrite can be effectively controlled without influencing dissolution of a copper sulfide ore. The electrochemical method provided by the invention has the advantages that the oxidation-reduction potential in the leaching system can be accurately controlled and conditions are created for realizing selective leaching of the copper sulfide ore.

A method for separating nickel-copper-iron from electroplating sludge. It is characterized in that the steps are as follows: according to the electroplating sludge: sulfuric acid solution: lignosulfonate mass ratio 1:2~5:0.002~0.005, add sulfuric acid solution and lignosulfonate to the electroplating sludge, feed oxygen, When the oxygen partial pressure is 0.3~0.7MPa, the leaching temperature is 100~150℃, the pH of the leaching solution is controlled at 0.5~1.5, and the leaching time is 1~5h. Stockpile. The method of the invention is simple to operate and can realize the purpose of selectively leaching copper, nickel and other elements and separating iron in one step. The leaching rate of copper, nickel and other elements is high, and the decomposition effect is good. The method of the invention is suitable for the treatment and utilization of electroplating sludge.

The invention discloses a method for extracting arsenic from arsenic-containing cobalt-nickel slag and preparing arsenate. The method comprises the following steps: adding the arsenic-containing cobalt-nickel slag to aqueous alkali in a reactor to obtain slurry, introducing a gas oxidizing agent from the bottom of the slurry, and performing normal-pressure oxidation under stirring; performing solid-liquid separation to obtain filter residues and a arsenic-containing filtrate, and performing evaporative crystallization on the arsenic-containing filtrate to obtain arsenate crystals. Under the cooperative work of a stirring way, stirring speed, gas flow and a gas introducing way during oxidizing alkaline leaching, a reaction mechanism of total blending in a bath is realized. Oxidizing leaching of the arsenic-containing cobalt-nickel slag is performed by adopting cheap raw gas oxidizing agent such as air with an alkaline process, , efficient leaching can be realized under normal pressure and low temperature, technical production difficulty and technical production cost are reduced remarkably, and the method has great industrialization significance.