10 results about "Sodium oxalate" patented technology

A method for efficiently recovering cobalt and nickel from waste lithium battery extract belongs to the field of hydrometallurgical technology. The technical problem solved by this invention is to provide a low-cost, low-pollution, and high-efficiency method for recovering cobalt and nickel from waste lithium battery extract. Specifically, it discloses a method using sodium oxalate solution to back-extract from a nickel-cobalt containing extract, obtaining a back-extract, then precipitating by adjusting the pH, and finally obtaining cobalt oxalate and nickel oxalate products after drying. The method includes the following steps: (1) preparing a sodium oxalate solution; (2) back-extraction; (3) cobalt precipitation; (4) nickel precipitation; (5) washing and drying the precipitate. This method is not only simple to operate, highly efficient, low-cost, and environmentally friendly, but also regenerates the extract, making it suitable for industrial production.

The present application relates to the technical field of lithium carbonate preparation, in particular to a method for preparing battery-grade lithium carbonate by using salt lake lithium carbonate, comprising the following steps: adding purified water and ethanolamine to crude lithium carbonate from salt lake brine, wet ball milling, then adding sodium hydroxide solution for alkali washing, adopting purified water to make slurry of the obtained filter residue A, carbonizing to obtain filter liquor B, adding magnesium chloride and sodium oxalate in sequence for impurity removal, pyrolyzing and crystallizing, drying the obtained lithium carbonate wet product to obtain battery-grade lithium carbonate. The method has the advantages of high purification process treatment efficiency and high lithium recovery rate, and the prepared lithium carbonate product can meet the requirements of battery-grade lithium carbonate.

This application provides a method for deep removal of calcium impurities from scandium oxide, belonging to the field of rare earth metal oxide purification. The method includes: dissolving scandium oxide raw material containing calcium impurities to obtain a calcium-containing scandium solution; adding a pH adjuster to the calcium-containing scandium solution to obtain a first scandium solution; reacting the first scandium solution with phosphoric acid and / or phosphate to obtain a second scandium solution and solid calcium phosphate; reacting the second scandium solution with a complexing agent to obtain a third scandium solution; reacting the third scandium solution with oxalic acid and / or sodium oxalate to obtain scandium oxalate crystals and a calcium complex solution; adding a strong acid solution to the calcium complex solution; and calcining the scandium oxalate crystals to obtain scandium oxide. Through calcium phosphate precipitation-complexation-crystallization, not only can calcium impurities be deeply removed from scandium oxide products, but impurities such as iron, titanium, and zirconium can also be removed, resulting in scandium oxide products with a purity of over 99.99%.

This invention discloses a method for determining the permanganate index based on modified biochar adsorbents, comprising the following steps: Step 1, modifying the biochar with a modifying solution. When the concentration of the modifying solution is 0.1 mol / L, an acidic modifier is used to modify the biochar adsorbent; when the concentration of the modifier solution is 0.2~0.4 mol / L, a salt modifier is used. Step 2, thoroughly shaking and mixing the modified biochar adsorbent with a water sample, adding sulfuric acid solution to acidify the water sample, adding potassium permanganate solution to the acidified water sample and heating the reaction, adding sodium oxalate solution after heating, shaking until the solution becomes colorless and without precipitate, titrating with potassium permanganate solution while hot until a light pink color appears and does not fade within a fixed time, recording the volume of potassium permanganate solution consumed, and calculating the potassium permanganate index. The type and concentration of the modifier used in this invention have a significant impact on the adsorption performance of biochar.

The present application relates to the inorganic nonmetal field, specifically to a kind of silver-coated hollow glass microsphere and its preparation method and application in electromagnetic shielding.The preparation method provided by the present application utilizes alkali activation silane coupling agent and silver nitrate to activate hollow glass microsphere, lays foundation for subsequent silane coupling agent and silver oxalate connection, improves silver-coated coating amount and degree of combination;Adopt sodium oxalate as the precipitant of silver, and the property is stable, transportation is convenient, reduction reaction is also stable, and sodium oxalate is low in cost, easy to obtain.The whole process does not produce waste gas, no resource waste, and the reagent consumed can be recycled;Two kinds of silver ion solution are configured in the preparation process, to avoid the excessive use of silver ion solution, further reduce cost.In addition, the silver-coated hollow glass microsphere obtained by the preparation method provided by the present application is uniformly coated with silver, not only good electromagnetic shielding performance, but also high thermal conductivity.

The present application relates to a kind of lithium iron phosphate black powder full element recovery preparation battery grade lithium dihydrogen phosphate and ferrous oxalate method, belong to waste battery recycling technical field.The method includes: lithium iron phosphate black powder is mixed with sodium salt and is calcined, lithium, iron, phosphorus is converted into soluble sodium phosphate and iron-containing lithium residue;By water immersion and dilute sulfuric acid assisted leaching, sodium phosphate leaching liquid and iron-containing lithium solid residue are obtained by separation;Iron-containing lithium solid residue is acid leaching, iron powder reduction, calcium and magnesium are removed by chelating resin, and then reacted with sodium oxalate to prepare battery grade ferrous oxalate;After sodium phosphate leaching liquid is removed by chelating resin aluminum, it is mixed with lithium-rich liquid of ferrous oxalate preparation section, and lithium phosphate is prepared by double decomposition reaction;Lithium phosphate is reacted with phosphoric acid to obtain battery grade lithium dihydrogen phosphate finally.The present application realizes the full element recovery of lithium, iron, phosphorus and carbon, and the product has high purity, which can be directly used to prepare high-pressure lithium iron phosphate positive material, and has the advantages of simple process, low cost and green environmental protection.

The application discloses a preparation method of a PVC processing stabilizer and belongs to the technical field of polymer material additives. The rare earth carboxylate precursor is synthesized through a step-by-step pre-complexing process, the molar ratio of the rare earth nitrate, sodium fatty acid and sodium oxalate is controlled to be 1:(3.0-3.15):(0.4-0.6), and a binuclear rare earth cluster structure with oxalate as a bridging ligand is constructed. Then, the precursor, calcium zinc soap and auxiliary stabilizers are extruded and granulated at a specific temperature gradient through a low-temperature stage-by-stage synergistic compounding and extrusion granulation process. The stabilizer prepared by the application utilizes the'structural slow release' of the binuclear cluster structure and the'stage-by-stage synergistic' mechanism of multiple components, and significantly solves the problems of fast 'zinc burning' and poor transparency of traditional rare earth stabilizers. Experiments show that the stabilizer not only prolongs the dynamic heat stabilization time of the PVC product, has excellent initial whiteness, but also gives the product excellent transparency.

The present application belongs to the technical field of lithium iron phosphate battery recycling, and particularly relates to a method for removing aluminum from lithium iron phosphate black powder, comprising the following steps: (1) mixing lithium iron phosphate black powder with water to prepare a slurry; (2) mixing the slurry prepared in step (1) with an aluminum removal liquid, heating and reacting under stirring, and then performing solid-liquid separation to obtain a first filtrate and a filter residue, and washing the filter residue to obtain aluminum-removed lithium iron phosphate; the aluminum removal liquid is prepared by mixing a solute with a solvent, and the solute comprises sodium chloride, sodium sulfide, sodium phosphate and sodium oxalate.

This invention discloses a crystalline oxalate film passivating agent as an alternative to phosphates, comprising, by weight percentage: 15.0%–30.0% sodium oxalate, 10.0%–20.0% potassium titanium oxalate, 5.0%–9.0% nitric acid, 10.0%–15.0% sodium dodecyl sulfate, 3.0%–5.0% complexing agent, 1.0%–4.0% corrosion inhibitor, and the balance being water. This crystalline oxalate passivation film forms a more uniform and dense film compared to phosphate passivation, and is more environmentally friendly.