WET METALLURGY METHOD FOR TREATING LOW-QUALITY LATERITIC NICKEL ORE USING ATMOSPHERIC PRESSURE AND ELEVATED PRESSURE COMBINED ACID LEACHING

摘要

Disclosed is a wet metallurgy method for treating low-quality lateritic nickel ore using atmospheric pressure and elevated pressure combined acid leaching, comprising the following steps: formulating a transition ore pulp, mixing the heated transition ore pulp and heated concentrated sulfuric acid in a certain proportion, performing an acid leaching reaction, and performing solid-liquid separation after dissolution in water to obtain an atmospheric leaching residue and an atmospheric leaching liquid; formulating a limonite ore pulp, mixing the limonite ore pulp and the atmospheric leaching liquid, heating same, performing pressure leaching under a pressure of 2.0 MPa - 4.0 MPa and a temperature of 220 °C - 240 °C, and then performing solid-liquid separation after cooling to obtain a pressure leaching residue and a pressure leaching liquid; and preparing the pressurized leaching residue into iron powder by using ball pressing and a roasting process.