12results about "Manganese sulfates" patented technology

In the recovery method provided in this application, CO is generated by the reaction of oxalic acid and concentrated sulfuric acid. This provides an acidic atmosphere for the reaction between the cathode powder and CO, allowing some of the cathode powder (LiMeO2) to melt, transforming the solid-gas two-phase system into a solid-gas-liquid three-phase system, which is beneficial for improving the recovery rate of Li ions in LiMeO2. Furthermore, the use of CO for pre-lithiation results in a low lithium content in the solid filter material, minimizing interference from lithium ions in impurity removal and providing the possibility for subsequent efficient impurity removal. On the other hand, under acidic conditions, CO undergoes a reduction reaction with the cathode powder, reducing high-valence ions in the cathode powder to lower-valence ions, resulting in a more thorough reduction. This allows the solid filter material to dissolve in sulfuric acid, achieving efficient impurity removal. Additionally, Al is removed by adding alkali, oxidant, fluoride, and adsorbent. 3+ Fe 3+ Ca 2+ Mg 2+ F ‑ A second solution containing MeSO4 is obtained, which can be used as a precursor for preparing positive electrode active materials. It achieves efficient overall impurity removal and improves lithium recovery rate, while obtaining a high-purity MeSO4 solution.

This invention discloses a method for producing sulfate from waste acid wastewater, relating to the field of industrial wastewater reuse technology. The method includes the following steps: raw material pretreatment: collecting waste acid wastewater generated from the washing process of non-ferrous metal smelting flue gas, and concentrating it to obtain concentrated acid water; slurrying and leaching: mixing materials containing metal oxides with the concentrated acid water in a certain proportion, and carrying out slurrying and leaching reactions; purification: purifying the leached solution to obtain a purified solution; sulfate preparation: treating the purified solution to obtain a solid sulfate product. This method directly uses waste acid to replace expensive purchased sulfuric acid, significantly reducing the production cost of sulfate. It is particularly suitable when sulfuric acid market prices are high. Conventionally, producing one ton of zinc sulfate consumes 0.43 tons of sulfuric acid, and producing one ton of manganese sulfate consumes 1.23 tons of sulfuric acid. Using this method, sulfuric acid is directly replaced, resulting in significant cost savings.

The application belongs to the technical field of battery material recycling, and particularly discloses a battery black powder recycling method. The battery black powder recycling method provided by the application comprises the following steps: obtaining lithium-containing leaching liquor and leaching residue by pressurized acid leaching of battery black powder; performing acid leaching reaction on the leaching residue to obtain nickel-, cobalt- and manganese-containing leaching liquor; adding an oxidizing agent to the nickel-, cobalt- and manganese-containing leaching liquor, adjusting the pH by using alkali to remove iron and aluminum, and filtering to obtain a post-iron-and-aluminum-removal liquid; extracting Ca by using HBL120 extractant to obtain Co-, Ni- and Mn-containing raffinate; extracting Mn by using P204 extractant to obtain Mn-loaded organic phase and Co- and Ni-containing raffinate; extracting Co by using Cy272 extractant to obtain Co-loaded organic phase and Ni-containing raffinate; and removing F and P from the Ni-containing raffinate to obtain a nickel sulfate solution. The application has high lithium extraction rate and shortens the process flow of manganese recycling.

The present application relates to electrolytic manganese production technical field, propose a kind of electrolytic manganese preparation liquid section manganese sulfate slurry separation and thickening system and method, including for generating the neutralization oxidation tank of manganese sulfate slurry to be handled, the top of neutralization oxidation tank is connected with first delivery pump by conduit, the export end of first delivery pump is connected with thickener, the export end of thickener is connected with second delivery pump by conduit, the export end of second delivery pump is connected with transfer buffer tank for receiving thickener underflow by conduit, the export end of transfer buffer tank is connected with third delivery pump by conduit, the export end of third delivery pump is connected with van type filter press by conduit, and the washing liquid inlet of van type filter press is connected with washing liquid supply device.The present application is designed by systematization, and significant beneficial effects are brought in efficiency, recovery rate, automation and equipment life, and efficient, reliable solution is provided for electrolytic manganese production.

This invention relates to a method for preparing high-purity manganese sulfate for lithium manganese iron phosphate precursors, belonging to the field of battery materials technology. This method aims to solve the problems of low ore reactivity leading to poor leaching efficiency and high energy consumption, difficulty in deep removal of calcium and magnesium impurities and significant environmental risks, and high energy consumption and poor product quality in the concentration and crystallization process of traditional pyrolusite manganese sulfate production. Key technical points include: using oxalic acid as a reducing agent for wet mechanical activation reduction leaching of pyrolusite; using a composite extraction system composed of P507 and TOA to deeply remove impurities from the leached slurry; returning a portion of the solid residue as a recycled grinding aid to the leaching step; and integrating thermally coupled back-extraction and evaporation crystallization operations in the same MVR system to achieve synergistic energy saving in impurity separation and product crystallization. This method is mainly used to prepare high-purity manganese sulfate with low impurity content, which can be used as a key precursor raw material for high-performance lithium manganese iron phosphate cathode materials.

The utility model belongs to the technical field of manganese sulfate evaporation crystallization, specifically relates to a kind of manganese sulfate evaporation crystallization device, including crystallizing tank and the cover of being set at the top of crystallizing tank, heater is arranged on the inner wall of the bottom of crystallizing tank, and steam heat exchange assembly is arranged on the crystallizing tank, steam heat exchange assembly includes the cavity being opened in crystallizing tank, water and spiral condenser pipe are arranged in the cavity, cover is provided with the gas duct of steam entering, and air draught fan is arranged on the gas duct, and the gas duct side is connected with spiral condenser pipe air inlet.The device can recycle the heat in steam, keep the crystallizing tank in high temperature all the time, and keep the state of heat preservation, without increasing the consumption of energy, thereby improving the crystallization efficiency.

The application provides a graded recycling method for waste ternary lithium batteries, and belongs to the technical field of lithium battery recycling. The method comprises a tooling bottom plate, first support frames are installed on the top of both sides of the tooling bottom plate, first sliding grooves are formed in the top of both sides of the tooling bottom plate, and first sliding blocks that are matched with the shapes of the first sliding grooves are fixedly connected to the bottom of the first support frames; and a conveying and clamping mechanism is used for conveying and clamping and fixing the waste batteries. The conveying and clamping mechanism and the auxiliary winding mechanism are arranged, so that the waste lithium batteries can be conveyed and moved along the tooling bottom plate and clamped and fixed gradually during the conveying process; when the lithium battery shell reaches the cutting area at the top of the tooling bottom plate, the lithium battery shell can be kept in a stable state; the auxiliary winding mechanism moves synchronously with the conveying and clamping mechanism, the separation of the electrode and the diaphragm is realized during the movement process, and the separate winding is synchronously completed, so that the recycling efficiency of the electrode and the diaphragm is improved, and the separated electrode and diaphragm are wound neatly.

This invention discloses a method for preparing battery-grade manganese sulfate using a combined MVR (Mechanical Vapor Reduction) concentration and intelligent temperature control system, belonging to the field of hydrometallurgical and chemical process control technology. This method aims to solve the technical challenges in the MVR concentration process, such as wide particle size distribution of manganese sulfate crystals due to temperature fluctuations and high energy consumption caused by control system response delays. The core solution involves: online monitoring of the density and temperature of the concentrate at the evaporator outlet of the MVR system, with the supersaturation calculated in real time by an intelligent temperature control system; dynamically coordinating and adjusting the compressor frequency and heater power by comparing the supersaturation with a preset optimal range of 1.05-1.20, thereby precisely stabilizing the evaporation temperature and supersaturation; after the solution is concentrated to 300-350 g / L, it is sent to a crystallizer to complete crystallization and separation, obtaining battery-grade manganese sulfate crystals. This invention is mainly used for the efficient preparation of battery-grade manganese sulfate with uniform crystal particle size and achieves energy savings in the process.

This invention provides a method for purifying manganese sulfate solution and a high-purity manganese sulfate electrolyte. The purification method includes the following steps: (1) mixing Mn... 2+ (1) The solution is mixed with a high-valence manganese solution to react and obtain a manganese-enriched precipitate; (2) The manganese-enriched precipitate obtained in step (1) is washed with water and then mixed with sulfuric acid and heated to react and obtain a refined manganese sulfate solution; (3) The refined manganese sulfate solution is subjected to elemental analysis, and the refined manganese sulfate solution that does not meet the standard is returned to step (1) as Mn. 2+ The solution is mixed with a high-valent manganese solution and further refined until a high-purity manganese sulfate electrolyte meeting the standards is obtained; wherein the high-valent manganese solution contains manganate and / or permanganate. This invention employs a two-stage purification process of "high-valent manganese oxidation + water washing," which can selectively remove impurity ions of different properties from the manganese salt solution, ultimately obtaining a manganese sulfate electrolyte with a purity of over 99.999%, fully meeting the requirements for electrodeposition of high-purity manganese.

The application discloses a method for oxidizing ferrous iron in cobalt-nickel ore smelting and a cobalt-nickel ore smelting method. The method for oxidizing ferrous iron in cobalt-nickel ore smelting comprises the following steps: adding alkali to copper-manganese liquid generated in cobalt-nickel ore smelting, removing copper and zinc to obtain a crude manganese sulfate solution containing manganese and calcium; then continuously adding alkali to the crude manganese sulfate solution, performing solid-liquid separation to obtain high-valence manganese residue; and finally adding the high-valence manganese residue into cobalt-nickel ore smelting leaching liquid to perform oxidation reaction, so that the oxidation of ferrous iron in the leaching liquid can be realized. The concentration of Fe 2+ in the leaching liquid treated by the method for oxidizing ferrous iron in cobalt-nickel ore smelting disclosed by the application is less than 20 mg / L, which meets the production requirements. The method disclosed by the application is simple in operation, convenient in production, can greatly improve the safety of production, and can reduce the production cost.

A pure-phase polyanionic sulfate sodium-ion battery cathode material is disclosed. The general formula of the pure-phase polyanionic sulfate sodium-ion battery cathode material is NaxMyAzSO4, where M is one or more of Mn, Fe, Co, Ni, Cu, and / or Zn, A is one or more of Li, K, and / or Na, and the range of values that each variable can take is 0.75 ≦ x ≦ 0.85, 0.52 ≦ y ≦ 0.58, 0 < z ≦ 0.1, and x + 2y + z = 2. The pure-phase polyanionic sulfate sodium-ion battery cathode material has the characteristics of good structural stability, excellent rate performance, good cycle performance, and a simple and low-cost manufacturing method.

The present application relates to the technical field of manganese dioxide preparation, in particular to a method for deep purification and impurity removal of manganese sulfate solution for electrolytic manganese dioxide. The preparation process comprises the following steps: preliminary treatment of crude manganese sulfate solution; preparation of iron-manganese doped carbon adsorbent from lignin; complex precipitation of heavy metal ions in the treated manganese sulfate solution by sodium lignosulfonate and iron-manganese doped carbon adsorbent; preparation of byproduct from the filter residue in step S3 by high-temperature pyrolysis. The present application prepares iron-manganese doped carbon adsorbent from high-temperature pyrolysis of lignin, and adsorbs heavy metal ions in the manganese sulfate solution by the iron-manganese doped carbon adsorbent. The carbon adsorbent obtained after high-temperature treatment of lignin has a certain effect of flocculating metal ions, and can complex with heavy metal ions in the manganese sulfate solution to form solid complexes, thereby removing other heavy metal ions in the manganese sulfate solution and improving the purity of the manganese sulfate solution, laying a foundation for the preparation of high-purity manganese dioxide.