Improved processing methods for laterite nickel ore

By using manganese-containing substances to oxidize ferrous iron in the laterite nickel ore processing technology, combined with multi-step neutralization and precipitation treatment, the problems of high energy consumption and high slag rate in the existing process are solved, achieving efficient separation of iron, aluminum and scandium and scandium recovery, reducing production costs and environmental risks.

CN120366574BActive Publication Date: 2026-09-01CHINA ENFI ENG CORP +1
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Patent Information

Application Number
CN202510558181.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-04-29
Publication Date
2026-09-01
Estimated Expiration
2045-04-29

AI Technical Summary

Technical Problem

In existing laterite nickel ore processing technology, the oxidation rate of ferrous iron is slow and the utilization rate of compressed air is low, resulting in high energy consumption, inability to recover iron, high slag rate, and significant environmental safety hazards.

Method used

Manganese-containing substances are used as oxidants to oxidize ferrous iron to ferric iron, and the separation of iron and scandium is achieved through a multi-step neutralization and precipitation process, including steps such as oxidation to remove iron, neutralization to remove iron, aluminum washing, and scandium precipitation. Process parameters such as temperature, pH value and time are optimized.

Benefits of technology

It improves the oxidation efficiency of ferrous iron, reduces energy consumption, reduces slag rate, achieves effective separation of iron, aluminum, and scandium, improves scandium recovery rate, and reduces production costs and environmental pollution risks.

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Abstract

This invention provides an improved processing method for laterite nickel ore. The improved method includes: Step S1, acid leaching followed by filtration and washing of the laterite nickel ore to obtain a post-leaching solution and a first leaching residue; Step S2, where Step S2 is selected from any one of Steps S2-1, S2-2, and S2-3; Step S3, using a precipitant to perform a first-stage precipitation of nickel and cobalt in the solution after aluminum and scandium removal or iron and aluminum removal, followed by thick filtration to obtain a first-stage precipitated nickel and cobalt solution and nickel and cobalt hydroxide product; Step S4, using a nickel and cobalt neutralizing agent and an oxidizing agent to perform a second-stage precipitation of nickel and cobalt in the first-stage precipitated nickel and cobalt solution to obtain magnesium manganese sulfate solution and nickel-cobalt-manganese slurry. Traditional processes utilize compressed air to oxidize ferrous iron, resulting in energy waste. This application uses manganese-containing substances as an oxidizing agent to oxidize ferrous iron to ferric iron, which not only solves the problem of slow oxidation rate of ferrous iron at low pH and waste of compressed air, but also improves the scandium recovery rate.
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