METHOD FOR PREPARING TERNARY CATHODE MATERIAL FROM LATERITE NICKEL ORE NITRIC ACID LEACHING SOLUTION

摘要

A method for preparing a ternary cathode material from a laterite nickel ore nitric acid leaching solution, comprising: adjusting pH of a laterite nickel ore nitric acid leaching solution to obtain an iron and aluminum slag and a filtrate, adding fluoride salt to the filtrate to deeply remove calcium and magnesium to obtain a calcium-magnesium slag and a nickel, cobalt, and manganese-rich solution, adjusting pH of the nickel, cobalt, and manganese-rich solution again, precipitating nickel, cobalt, and manganese to obtain one nickel, cobalt, and manganese slag and a nickel, cobalt, and manganese-poor solution, adjusting the pH of the nickel, cobalt, and manganese-poor solution, deeply precipitating nickel, cobalt, and manganese, returning the obtained second nickel, cobalt, and manganese slag for adjusting the pH of the laterite nickel ore nitric acid leaching solution, and preparing a precursor of the ternary cathode material from the one nickel, cobalt, and manganese slag; adding the precursor, a lithium source, an additive agent, and water to a high pressure reactor by the amount, performing a hydrothermal reaction, directly drying, grinding, and high temperature calcination to obtain the nickel, cobalt, manganese, and lithium ternary cathode material. The method improves the comprehensive use of associated resources in a laterite nickel ore, is wide in source of raw material, has a simple processing procedure, is low in cost and the like. The ternary cathode material prepared by the method has a uniform granularity, good stability, high specific capacity, and high activity.