5results about How to "Improve direct yield" patented technology

The application discloses a method for preparing lithium pre-doped amine coordination manganese iron phosphate precursor from lithium manganese iron phosphate, and belongs to the field of battery recycling. The method comprises the following steps: stirring and reacting lithium manganese iron phosphate battery material with a high-valence iron salt solution and a surfactant, and filtering to obtain filtrate and phosphorus iron residue; mixing the filtrate with a phosphate, adjusting the pH of the solution to 2-6, then mixing with an oxidizing agent A, and adding a mixed solution containing an organic amine compound to perform nucleation precipitation reaction, and aging to obtain the lithium pre-doped amine coordination manganese iron phosphate precursor. The application utilizes the surfactant and the high-valence iron salt to efficiently replace divalent iron under acid-free or weak acid conditions, generates a metal solution containing Li + , Fe 2+ , Mn 2+ , performs oxidation to form nucleation precipitation, adds an organic amine compound to control the morphology of the generated particles in the solution, generates the lithium-doped amine coordination manganese iron phosphate precursor, the reaction condition is mild, the energy consumption in the treatment process is low, and the economic utilization value of a manganese byproduct is improved.

The invention provides a preparation method of micro-powder-free cobalt hydroxide, belongs to the technical field of lithium ion battery material preparation, and solves the problems that the content of micro powder is high and the synthesis process is difficult to control when the cobalt hydroxide is prepared in the prior art. The method comprises the following operation steps: preparing a solution, carrying out a synthetic reaction, aging, washing, drying and the like, and synthesizing a crimson beta-type cobalt hydroxide product with a product index D0 greater than or equal to 3 microns and regular morphology by controlling the temperature of a synthetic raw material solution at-5 to + 5 DEG C and controlling proper synthesis conditions. The cobalt hydroxide prepared by the method is regular in microstructure, does not contain fine micro-powder particles, and can be used for preparing cobaltosic oxide required by high-voltage lithium cobalt oxide.

The present application belongs to copper pyrometallurgy technical field, specifically discloses a kind of dynamic optimization method of double-side blowing copper smelting slag type based on molten pool working condition real-time monitoring and model driving.The method includes: real-time acquisition molten pool temperature, flue gas oxygen content, slag Fe3O4 Content and viscosity and other multiple key working condition parameters;Parameter is input into the preset control model, the expert rule based on metallurgical thermodynamics and production data is embedded in the model, and the dynamic adjustment amount of SiO2, CaO, MgO three kinds of slag forming agent is calculated accordingly;According to the adjustment amount, the proportion of slag forming agent is adjusted in real time;Periodic acquisition of slag sample analysis, compare measured value with model expected value, and feedback correction model parameters, realize closed-loop optimization.The present application can dynamically adjust slag type according to molten pool real-time working condition, reduce the fluctuation of slag fluidity by more than 40%, stabilize the copper content of slag below 1.5%, and improve the direct recovery rate of copper to more than 97.5%, significantly improve the process stability and metal recovery rate.

The present application belongs to the field of metallurgy, and discloses a method for removing arsenic, antimony and bismuth from crude copper, comprising the following steps: S1. Melting crude copper raw material to obtain molten copper liquid, and controlling the temperature of the molten copper liquid to be 1150-1250 DEG C; S2. Adding a slagging agent to the molten copper liquid, and introducing oxygen-containing gas to remove impurities from the molten copper liquid; first, maintaining the oxygen volume concentration at 0.1%-0.5%, adding a part of the slagging agent to react; then, increasing the oxygen volume concentration to 1.5%-3.0%, and adding the remaining slagging agent to react; wherein the slagging agent comprises an alkaline carbonate, an oxidizing agent and a crystal nucleus inducer; the oxidizing agent is sodium nitrate or / and potassium nitrate; S3. Allowing the molten copper liquid to be separated from the slag phase, and removing the slag to obtain refined copper liquid. The method can deeply remove arsenic, antimony and bismuth, and can reduce the amount of slag, and the slag system has good fluidity and is easy to separate, so that the copper purity is improved while the recovery rate is ensured.

This invention discloses a method for preparing 4N ammonium permanganate from low-concentration rhenium-containing waste acid, which is divided into a crude refining stage and a refining stage. The crude refining stage includes a rhenium precipitation process, a leaching process, a hydrolysis process, an acidification process, an extraction process, a back-extraction process, and a crystallization process. The refining stage includes a crude ammonium permanganate dissolution process, an ion exchange process, an extraction process, a back-extraction process, a crystallization process, and a nitration-recrystallization process, ultimately obtaining ammonium permanganate with a purity of 99.99%. In the crude refining stage, this invention first prepares 4N ammonium permanganate from low-concentration rhenium-containing waste acid. Rhenium is efficiently and selectively enriched in concentrated waste acid to obtain a 1% grade rhenium precipitate. Then, a weak oxidation leaching process is used to remove impurities from the precipitate, followed by calcium hydroxide hydrolysis, acidification, high-efficiency extraction, back-extraction, and crystallization to obtain a crude ammonium perrhenate product with a grade of ≥99%. In the refining stage, the crude ammonium perrhenate is dissolved a second time, and a resin ion exchange, extraction, back-extraction, and crystallization process is used to obtain a refined ammonium perrhenate with a grade of ≥99.9%. Finally, a nitration-recrystallization process is used to remove impurities from the refined ammonium perrhenate to achieve a 4N grade quality.