PHOSPHATE ORE BENEFICIATION

摘要

A process for the recovery of phosphate values from a phosphate ore, wherein the ore is leached with a mixture comprising water, sulphur dioxide and an organic carbonyl compound; the leach liquor containing dissolved phosphate values and calcium hydroxysulphonate is separated from any gangue and other insoluble material; and the leach liquor is treated to recover therefrom a phosphate-rich product and at least part of the sulphur dioxide and the carbonyl compound; characterised in that the leaching is carried out under condition such that substantially no calcium hydroxysulphonate is precipitated at the leaching stage.