Method for preparing battery-grade nickel sulfate through collaborative purification of crude nickel sulfate and crude nickel carbonate

By using a synergistic purification method of crude nickel sulfate and crude nickel carbonate, the problems of low impurity removal efficiency, high cost, and serious environmental pollution in existing nickel sulfate purification technologies have been solved. This method enables the production and recycling of high-purity battery-grade nickel sulfate, reducing energy consumption and environmental impact.

CN121269828APending Publication Date: 2026-01-06JIANGXI GUANGDE ENVIRONMENTAL PROTECTION TECH CO LTD
0 Cites 1 Cited by

Patent Information

Application Number
CN202511586498.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-01
Publication Date
2026-01-06

AI Technical Summary

Technical Problem

Existing nickel sulfate purification technologies suffer from problems such as insufficient impurity removal efficiency, low raw material utilization, difficulty in achieving battery-grade product purity, high environmental impact, and high energy consumption. In particular, the complexity and high toxicity of hexavalent chromium processing lead to high production costs, and the waste residue and waste liquid generated by traditional processes cause serious pollution.

Method used

A method for the synergistic purification of crude nickel sulfate and crude nickel carbonate is adopted. By optimizing the raw material ratio, introducing a synergistic neutralization strategy, multi-stage fine impurity removal and efficient concentration and crystallization technology, including steps such as alkaline washing, oxidation-reduction, precipitation, activated carbon adsorption and ion exchange, combined with precise pH and ORP control, to achieve efficient removal of impurities such as iron, chromium and aluminum, and reduce environmental pollution through resource recycling.

Benefits of technology

It significantly improves nickel recovery rate and product purity, reaching battery-grade standards, reduces production costs and energy consumption, realizes green production and resource recycling, and ensures high quality of lithium-ion battery cathode materials.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a method for preparing battery-grade nickel sulfate through collaborative purification of crude nickel sulfate and crude nickel carbonate. According to the method, crude nickel sulfate is dissolved firstly, then crude nickel carbonate is utilized for batch synergistic neutralization, and the alkalinity of the nickel carbonate is effectively utilized to reduce extra acid and alkali consumption. And then through multi-stage fine purification, including Fe oxidation and preliminary precipitation, Cr (VI) reduction and high-pH precipitation, main impurities such as iron, chromium, aluminum and the like are efficiently removed. And after the mother liquor is adsorbed by activated carbon and trace impurities are removed by strong-acid cation exchange resin, vacuum evaporation and concentration are carried out, and seed crystals are introduced for cooling crystallization, so that pure NiSO4. 6H2O crystals are obtained. The whole technological process pays attention to resource recycling, washing water recycling and nickel recycling of nickel-containing filter residues, waste gas and waste liquid are treated, and clean production is achieved. The nickel sulfate product prepared by the method is high in purity, meets the battery grade standard, and has good economic benefits and environmental benefits.
Need to check novelty before this filing date? Find Prior Art