Process for the selective removal of impurities present in sulfi

Details Process for the selective removal of impurities present in sulfi Process for the selective removal of impurities present in sulfi

1979-06-21

1980-12-30

Ozaki, G.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 7, 75 9, 75113, C22B 108, C22B 110

Patent

active

042421241

ABSTRACT:
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 precipitates containing similar minerals, by breaking up and rearranging, at an elevated temperature of 600.degree.-900.degree. C. and a high partial 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.

REFERENCES:
patent: 892110 (1908-06-01), De Alzugaray
patent: 1671003 (1928-05-01), Baghdasarian
patent: 3817743 (1974-06-01), Sardisco
patent: 3857767 (1974-12-01), Gabler et al.
patent: 4092152 (1978-05-01), Borbely

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