2results about How to "Purity Effect" patented technology

This invention relates to a surface passivation method for high-purity manganese. The surface passivation method includes the following steps: (1) rinsing the surface of high-purity manganese with isopropanol, and then immersing it in a passivation solution for surface passivation; (2) rinsing with isopropanol and vacuum drying to complete the surface passivation of high-purity manganese. The passivation solution comprises tannic acid, phytic acid, benzotriazole, imidazole, and hydrogen peroxide. The surface passivation method provided by this invention is for high-purity manganese products removed from the electrolytic cell after electrolytic preparation of high-purity manganese. This surface passivation method, through the use of a specific passivation solution, can not only ensure the surface passivation effect of high-purity manganese, but also ensure the purity of the obtained high-purity manganese, avoiding the adverse effects of the passivation solution on the purity of high-purity manganese.

The application provides a method for co-production of battery-grade nickel sulfate and battery-grade iron phosphate, comprising the following steps: 1) performing first acid leaching treatment on a nickel-iron alloy pair by using an acid liquor to obtain a first acid leaching liquor and a first acid leaching residue; 2) performing second acid leaching treatment on the first acid leaching residue by using an oxidizing agent and an acid liquor to obtain a second acid leaching liquor and a second acid leaching residue; 3) performing extraction treatment on a mixed liquor comprising the first acid leaching liquor and the second acid leaching liquor by using an ion exchange resin to obtain a raffinate comprising ferrous ions; performing oxidation treatment on a system comprising the raffinate and a phosphorus source to obtain iron phosphate; 4) performing cleaning treatment on the ion exchange resin after the extraction treatment by using an acid liquor, then performing stripping treatment on the ion exchange resin by using an acid liquor and performing cooling crystallization treatment on a stripping liquor comprising nickel ions to obtain nickel sulfate. The method provided by the application has high nickel leaching rate and iron leaching rate, the prepared nickel sulfate and iron phosphate have high purity, and the process flow is simple.