C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/368
C22B 5/02 (2006.01) C22B 1/00 (2006.01) C22B 1/08 (2006.01)
Patent
CA 1127853
ABSTRACT OF THE DISCLOSURE A process for the selective removal of the impurities, arsenic, antimony, selenium, tellurium and bismuth, present in sulfidic complex or mixed ores and concentrates or industrial precipit- ates containing similar minerals, by breaking up and rearrang- ing, at an elevated temperature of 600-900°C and a high part- ial pressure of at least 0.2 atm of elemental sulfur, the minerals present in the raw material, in order to cause the formed new impurity compounds to pass into the gas phase, wherein the rearranging is carried out in a gas atmosphere which, in addition to sulfur, contains a sulfur halide in order to halogenate the impurity compounds which have passed into the gas phase, to form stable halides which no longer affect the vaporization equilibrium.
330338
Fetherstonhaugh & Co.
Outokumpu Oy
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