51results about "Cobalt compounds preparation" patented technology

A process for the recovery of nickel and cobalt from an acidic resin eluate containing at least nickel and cobalt, said process including the steps of: (a) treating the eluate with an immiscible organic reagent (18) to selectively absorb the majority of the cobalt, and a portion of any copper, zinc and manganese present in the eluate, leaving a raffinate containing the nickel and minor impurities; (b) neutralising the raffinate to precipitate the nickel as nickel hydroxide (19); (c) stripping the cobalt from the organic reagent (22); and (d) recovering the cobalt (23).

There are provided processes for treating red mud. For example, the processes can comprise leaching red mud with HCl so as to obtain a leachate comprising ions of a first metal (for example aluminum) and a solid, and separating said solid from said leachate. Several other metals can be extracted from the leachate (Fe, Ni, Co, Mg, rare earth elements, rare metals, etc.). Various other components can be extracted from solid such as TiO₂, SiO₂ etc.

Carbon particles having fine particles deposited thereon which can be used as a substitute for the carbon particles having platinum deposited thereon and metallic platinum particles which are presently in general use as, e.g., a catalyst for electrodes in fuel cells. Compared to the conventional carbon particles having platinum deposited thereon, etc., the carbon particles are effective in greatly reducing the amount of platinum to be used. The carbon particles are characterized by comprising carbon particles and, deposited on the surface of the carbon particles, fine particles of a perovskite type composite metal oxide in each of which fine noble-metal particles are present throughout the whole particle. Also provided is a process for producing the carbon particles.

The carbon particles having deposited fine particles have a constitution in which fine particles of a perovskite type composite metal oxide each having fine noble-metal particles present throughout the whole perovskite type oxide particle and having a crystallite size of 1-20 nm are deposited on carbon particles. The process for producing such carbon particles having fine particles deposited thereon comprises preparing a solution containing fine perovskite type composite oxide particles and complex ions of a metal for constituting fine noble-metal particles, subsequently repeating the step of impregnating the solution into carbon particles and dried the particles to thereby adsorb complex ions of the metal onto the carbon particles, and then subjecting the resultant particles to heat treatment.

A method for processing lithium ion battery scrap according to this invention includes a leaching step of leaching lithium ion battery scrap to obtain a leached solution; an aluminum removal step of neutralizing the leached solution to a pH range of from 4.0 to 6.0, then performing solid-liquid separation and removing aluminum in the leached solution to obtain a first separated solution; and an iron removal step of adding an oxidizing agent to the first separated solution and adjusting the pH in a range of from 3.0 to 5.0, then performing solid-liquid separation and removing iron in the first separated solution to obtain a second separated solution.

The invention discloses a method for producing battery grade nickel sulfate and cobalt sulfate by waste nickel cobalt alloy. The method comprises the following steps of performing pretreatment on nickel cobalt alloy waste materials; then, performing electrochemical dissolution; removing impurities such as iron, chromium and aluminum from the obtained solution step by step by a chemical method andan extraction method; firstly extracting cobalt from the solution subjected to impurity removal; then extracting nickel; thus respectively obtaining extraction liquid containing cobalt and nickel; after the reverse extraction, obtaining nickel sulfate and cobalt sulfate solution; then, respectively performing evaporation, cooling crystallization, and centrifugal dewatering on the solution to obtain a product of the battery grade nickel sulfate and cobalt sulfate. The problems of low nickel and cobalt leaching efficiency, low dissolution speed and the like in the waste nickel and cobalt alloy recovery process by a conventional wet process can be effectively solved; the battery grade nickel sulfate and cobalt sulfate conforming to the product quality standard requirement can be produced, andcan be used as a new energy source battery raw material to be applied to the field of new energy source battery manufacturing. The process is simple; the environment pollution is low; the metal recovery rate is high; good practical values and economic values are realized.

The invention discloses a method for deeply removing cadmium in a high-concentration cobalt sulfate solution and recovering the cadmium. According to the method, firstly, an extracted organic phase containing Cyanex301 is adopted to enable the concentration of the cadmium to be decreased to be 0.001 g/L or less; cobalt and the cadmium in the organic phase are reversely extracted through sulfuric acid and hydrochloric acid, then resin is used for adsorbing metal complexing ions in stripping liquor, so that the cyclic utilization of the stripping liquor is realized; the resin is desorbed by using distilled water, so that separation of the cobalt and the cadmium on the resin is realized; and a desorption solution of the cadmium is subjected to vulcanization treatment, the cadmium is recycledin a form of a CdS product, and finally the ammonia desorption solution is returned for cadmium desorption, and the loss rate of the cobalt is almost zero in the whole technological process. The method has the advantages of being capable of efficiently removing the cadmium and cleaning and recovering the cadmium and capable of being widely applied to industrial production.

The present invention relates to a two-stage leaching process using concentrated hydrochloric acid that upgrades a variety of inferior quality titanium-iron ores into premium titanium concentrate and iron oxide products. The ground ore is leached with two separate quantities of hydrochloric acid after which the dissolved titanium is precipitated from the filtered liquor by hydrolysis. The still soluble iron chlorides are then optionally subjected to oxyhydrolysis to recover iron oxide and HCl. The process was developed for low-grade ores (under 12% TiO₂), and can be naturally applied advantageously to higher grade titanium-bearing ores.

The invention discloses a method for recycling a waste lithium battery and preparing a ternary precursor. The method comprises the following steps of pretreating the waste lithium battery to obtain battery powder and aluminum slag, roasting the battery powder, adding water into the roasted battery powder to prepare slurry, adding metal chloride to carry out leaching reaction, and carrying out solid-liquid separation to obtain nickel-cobalt-manganese slag and a lithium chloride solution; adding sulfuric acid into nickel-cobalt-manganese slag for acid leaching, adding aluminum slag into an acid leaching solution to remove copper, adjusting the pH value of the acid leaching solution to remove aluminum, mixing the aluminum-removed solution with a compound extraction agent, extracting to obtain a manganese-containing organic phase and a nickel-cobalt-containing raffinate, wherein the organic phase can be used for preparing manganese sulfate, and the raffinate can be used for preparing a high-purity nickel-cobalt sulfate mixed crystal through crystallization; and after the obtained battery-grade manganese sulfate and nickel-cobalt sulfate mixed crystal is dissolved in water, a certain amount of nickel-cobalt-manganese sulfate is supplemented to prepare a ternary precursor. The recovery process route provided by the invention has the advantages of simplicity in operation, low production cost, stability and reliability.

A method is for treating a lithium ion secondary battery positive electrode active substance waste product that contains cobalt, nickel, manganese and lithium, and involves: a carbon mixing step in which a powder-form positive electrode active substance waste product is mixed with carbon to obtain a mixture in which the ratio of the mass of the carbon is 10-30% of the total mass of the positive electrode active substance waste product and the carbon; a roasting step for roasting the mixture at a temperature of 600-800 DEG C to obtain a roasted powder; a lithium dissolving step which involves a first dissolving process for dissolving the lithium in the roasted powder in water or a lithium-containing solution and a second dissolving process for dissolving the lithium in the residue obtained in the first dissolving process in water; and an acid leaching step in which the residue obtained in the lithium dissolving step is leached with acid.

The invention discloses a preparation method of a battery-grade Ni-Co-Mn mixed solution and a battery-grade Mn solution. The preparation method comprises the following steps: acid dissolution, alkalization and impurity removal, calcium-magnesium-lithium synchronous precipitation, deep aging and impurity removal, collaborative extraction and refined extraction. The deep aging impurity removal and synergistic extraction step comprises the following steps: carrying out deep aging on filtrate obtained after the calcium-magnesium-lithium synchronous precipitation step, and performing filtering to remove impurities, so as to obtain aged filtrate; and extracting the aged filtrate by using P204 to obtain a loaded organic phase, and carrying out graded reverse extraction on the loaded organic phaseto obtain a battery-grade Ni-Co-Mn mixed solution and a Mn-containing solution. Through cooperation of multiple process steps of calcium-magnesium-lithium synchronous precipitation, deep aging impurity removal and synergistic extraction, the impurity content of the obtained battery-grade Ni-Co-Mn mixed solution is remarkably reduced, and the battery-grade Ni-Co-Mn mixed solution can be directly applied to preparation of a lithium battery ternary precursor material; and meanwhile, a battery-grade Mn solution can be obtained, large-scale application of the process is facilitated, and economic benefits are improved.

The invention provides a method for extracting nickel, cobalt and iron from low-grade laterite nickel ore. Laterite nickel ore on a transition layer and laterite nickel ore on a limonite layer are processed respectively, and the iron grade of produced iron concentrate reaches 60-65%; and meanwhile, after a resin adsorption technology is adopted and evaporation, concentrating and crystallizing areperformed, a nickel sulfate product containing 20-23% of nickel and a cobalt sulfate product containing 1-2.2% of cobalt are produced and can be used as raw materials for battery production. Accordingto the method, the economic benefit of a laterite nickel ore wet smelting process technology is greatly increased, it is achieved that a cold material before reacting exchanges heat with a hot material after reacting through a heat exchanger, energy consumption is reduced, and in addition, the technological process is simplified.

Provided is a method for inhibiting extractant degradation in the DSX process through the manganese extraction control, the method comprising: (a) stirring DSX solvent and DSX feed solution, which is a solution containing a valuable metal from which iron has been removed in an agitator, in which soda ash (Na₂CO₃) is further added to maintain a constant pH; and (b) scrubbing the manganese from the DSX solvent, extracted in step (a).

The invention discloses a method for recycling purified terephthalic acid wastewater. The method comprises the following steps: providing purified terephthalic acid wastewater, adjusting the temperature of the purified terephthalic acid wastewater to 30-45 DEG C, adjusting the pH value of the purified terephthalic acid wastewater to 2.5-4.5, and filtering the purified terephthalic acid wastewater to obtain a filtrate and a first solid which contains aromatic carboxylic acid; feeding the filtrate into an extraction system for extraction treatment to obtain an extraction phase and a raffinate phase; feeding the extraction phase into a rectifying tower, performing regeneration treatment to obtain a second solid matter containing aromatic carboxylic acid, feeding the raffinate phase into an ion exchange system, and performing ion exchange treatment; and carrying out desorption treatment on ion exchange resin in the ion exchange system to obtain cobalt and manganese ions. According to the method provided by the invention, recovery treatment of organic carboxylic acid and metal ions in the PTA wastewater is comprehensively considered, and the treatment load of a downstream section is remarkably reduced while effective recycling of resources is realized.

Provided is a method for producing solutions, by which two solutions, namely a high-purity nickel sulfate solution and a mixed solution of nickel sulfate and cobalt sulfate are able to be obtained at the same time from a sulfuric acid solution containing nickel, cobalt and calcium. A method for producing solutions according to the present invention uses a sulfuric acid solution containing nickel, cobalt and calcium and performs a first step S1 for producing a mixed solution of nickel sulfate and cobalt sulfate from the sulfuric acid solution and a second step S2 for producing a solution of nickel sulfate from the sulfuric acid solution in parallel. In the first step, the sulfuric acid solution is subjected to solvent extraction by an extractant, thereby obtaining a first organic solvent after extraction In the second step, the sulfuric acid solution is subjected to solvent extraction by means of an extractant.

The invention discloses a method for treating cobalt carbonate mother liquor in the preparation process of spherical cobalt carbonate. The method comprises the following steps that (1) ion exchange resin adsorption is carried out on the cobalt carbonate mother liquor filtered by white balls to obtain ion adsorption post-liquor and supported resin, the supported resin is desorbed by diluted hydrochloric acid to obtain hydrogen-type resin and acidic post-liquor, the hydrogen-type resin is transformed by ammonia water to obtain ammonium-type resin, the ammonium-type resin obtained after transformation continues to be used for treating the cobalt carbonate mother liquor, and the cobalt carbonate mother liquor is recycled; and (2) after evaporative crystallization is carried out on one part of the ion adsorption post-liquor in the step (1), ammonium chloride crystals and condensed water are obtained, the other part of the ion adsorption post-liquor is used for washing the ammonium-type resin, and only the ion adsorption post-liquor is adopted for washing the ammonium-type resin for the second time. By means of the method, the water treatment capacity can be reduced, the cobalt recovery rate can be improved, and the wastewater treatment difficulty can be reduced.

Provided is a method for inhibiting extractant degradation in the DSX process through the metal extraction control, the method comprising steps of: (a) adding limestone to a copper solvent extraction-raffinate to precipitate iron (Fe) and aluminum (Al) as a slurry, recovering a clarifying liquid; and (b) adding sulfuric acid to the recovered clarifying liquid to adjust the pH thereof.

The invention relates to a method for preparing nano cobalt tungstate and recovering crude titanium slag, and belongs to the field of non-ferrous metal recovery. According to the recovery method, high-purity nanometer cobalt tungstate and high-quality coarse titanium slag are obtained through recovery through the steps of pretreatment, element separation, titanium element recycling, tungsten element purification, tungsten element recycling and the like, the recovery process is simple and easy to implement, the element recovery rate is high, the product can be directly applied industrially, and reasonable and efficient treatment of the waste SCR denitration catalyst is achieved.

Provided is a method for inhibiting extractant degradation comprising preparing step, extracting step and scrubbing step, the method including: (a) the preparing step of a DSX solvent by adjusting the extractant concentration of the DSX solvent to a specific range; (b) the extracting step of metal included in the feed solution by adjusting the ratio of the organic (solvent) and an aqueous (solution) as a feed solution; (c) the scrubbing step of adjusting the zinc concentration of the solution using zinc sulfate; and (d) stripping step.