A process for concentration of nickel and joint production of iron red from nickel laterite

摘要

Abstract A Process For Concentration Of Nickel And Joint Production Of Iron Red From Nickel Laterite 5 The present invention relates to a process for concentration of nickel and joint production of iron red from nickel laterite, comprising: crushing and grinding nickel laterite, adding carbonous reducing agent and calce additive, blending and grinding, pelleting into pellets in ball forming machine, drying; rapid reducing the pellets at high temperature in a rotary hearth furnace, after the reduction, crushing, wet ball milling, separating by means of magnetic separator to give primary io ferronickel powder having >4% nickel content, pressure oxidizing leaching the primary ferronickel powder, upon the completion of oxidizing leaching, filtering and washing to obtain iron red and nickel sulfate solution, precipitating nickel with sodium hydroxide to obtain nickel hydroxide, under these conditions, the content of nickel in the nickel hydroxide product is 30-40%, the direct recovery of nickel reaches 70-75%, the content of iron in the iron red is 62-28%, and the recovery of iron is is 70-75%. The present invention has advantages of broad sources of raw materials, simple in process, high production efficiency, high recovery of nickel, low production cost, high utility of resources, and has important application and extension values.