Laterite nickel ore by sulfuric acid leaching process pressure and heat, the main mineral (serpentine) nickel, magnesium is leached into the solution, and the remaining amorphous silica into the form of slag, limonite ore transition For hematite. According to the nature of the ore, the Institute of Mineral Resources Comprehensive Utilization of the Chinese Academy of Geological Sciences has re-elected, magnetically selected, washed, treated with alkaline water, reduced roasting, and oxidized roasting. Re-election (panning) can enrich the chromium oxide to 26.48%, wash and dissolve more than 2/3 of nickel and cobalt in water, recover magnesium sulfate, wash, re-select (panning), water sieve classification The iron is separately enriched to 40%, 41%, 44% (less than 0.04 mm), but the harmful impurity sulfur content is greater than 2%. The acid leaching residue, the water washing slag and the feed thereof are reduced and calcined at different temperatures, and the hematite is reduced to metal iron, galena, magnetite, sulfur and iron which are decomposed by sulfate to form sulphur iron.
The acid leaching slag developed by the project has simple, economical, reasonable and waste-free process, which makes the laterite nickel mine fully utilized, which not only makes full use of resources, but also does not pollute the environment, and provides a large-scale development and utilization of laterite nickel ore. The new approach has a wider range of promotional applications.
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