METHOD FOR COMPREHENSIVELY TREATING LATERITE NICKEL ORE BY USING NITRIC ACID MEDIUM

摘要

A method for comprehensively treating a laterite nickel ore by using a nitric acid medium, comprising: crushing and finely grinding the crude ore of the laterite nickel ore to obtain ore powder; adding a nitric acid solution as a leaching agent to the ore powder, performing selective leaching, and performing liquid-solid separation to obtain leaching residues and a leachate; adding the obtained leachate to a calcining furnace for calcination and decomposition so as to obtain a mixed dry basis metal oxide, and producing a nitrogen oxide gas NO_x during calcination; performing a pelletizing process and a sintering process on the obtained leaching residues to generate an iron ore concentrate; and absorbing the nitrogen oxide NO_x, preparing concentrated nitric acid, preparing the nitric acid solution, and returning the nitric acid solution as the leaching agent. The method can achieve the effective separation of iron from nickel-cobalt, reduces the content of metals, such as aluminum and magnesium, in a nickel-cobalt product, reduces the use of a neutralizing agent, achieves the renewable use of a nitric acid, and greatly improves the comprehensive utilization efficiency and the economic value of the laterite nickel ore.