| 摘要 |
<p>The present invention provides a process of upgrading the nickel from nickel lateritic iron ore with iron content over 10%, silica content over 25% and nickel content of at least 0.5% which process comprises thoroughly mixing the ground ore with calcium carbonate, calcium sulphate and coke, spraying the mixture with a solution of sodium chloride, drying the mixture, heating the mixture at a temperature not exceeding 1050.degree. C, for a period of time up to 90 minutes, roasting the mixture at the above temperature for a sufficient period of time to convert all nickel in the ore to metallic state in a neutral or even slightly reducing atmosphere, grinding the roasted mixture in an aqueous medium, and adjusting the density of the pulp obtained for a subsequent flotation or by magnetic separation process to produce a concentrate.</p> |
