Process for the production of dicalcium phosphate

摘要

PCT No. PCT/AU83/00054 Sec. 371 Date Jan. 5, 1984 Sec. 102(e) Date Jan. 5, 1984 PCT Filed May 4, 1983 PCT Pub. No. WO83/03818 PCT Pub. Date Nov. 10, 1983.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; characterized in that the leaching is carried out under conditions such that substantially no calcium hydroxysulphonate is precipitated at the leaching stage.