Low temperature thermal upgrading of lateritic ores

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

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C22B 2302

Patent

active

051786664

ABSTRACT:
This invention relates to a thermal upgrading process whereby nickel-containing limonite or limonite/saprolite blends are pelletized with requisite amounts of solid carbon reductant and a sulfure-bearing concentrating agent. The pellets are fed to a reactor where they are gradually heated, causing reduction of the metal values. The reduced pellets are then held in a "metallics growth zone" of the reactor at a temperature high enough to allow for liquid-phase migration of the metallics within the pellets but below the point at which the pellets become sticky. The metallics growth zone is provided with a carefully controlled combustion gas atmosphere equivalent to about 60-65% aeration of partial combustion of natural gas which prevents further reduction or re-oxidation and thus provides a good environment for metallic particle growth. After a sufficient retention time, the pellets are then rapidly cooled to prevent the disproportionation of wustite to magnetite. The cooled pellets are then ground and the magnetic fraction separated.

REFERENCES:
patent: 3272616 (1966-09-01), Queneau
patent: 3914124 (1975-10-01), O'Neill
patent: 4120698 (1978-10-01), Atchison

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