Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1976-01-26
1978-03-14
Ozaki, G.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75108, 75121, 423 87, 423617, C22B 3002
Patent
active
040789179
ABSTRACT:
Disclosed is a process for extracting antimony trioxide from antimony sulfide ore concentrate by solubility differential of the trioxide in lower alkanol solutions of sodium or potassium hydroxide and wherein the total amount of water contained in the concentrate, the alkanol and the hydroxide is not more than 26.52 volume percent of the antimony sulfide content; which process includes treating the ore in the absence of substantial amounts of air with an alkanol solution containing an excess of sodium or potassium hydroxide, basis Sb.sub.2 S.sub.3 content in the ore; separating also, in the absence of substantial amounts of air, insoluble concentrate material from a filtrate composed of water, alkanol, hydroxide and sulfide of potassium or sodium, antimony trioxide trihydrate, sodium or potassium dihydro pyroantimonite; repeatedly extracting the insoluble material with the filtrate also in the absence of substantial amounts of air; allowing the filtrate to settle so as to form a precipitate of antimony trioxide and sodium or potassium dihydro pyroantimonite; separating the precipitate from the filtrate; dehydrating the precipitate to leave behind a mixture of antimony trioxide and hydroxide of sodium or potassium; and adding the separated alkanol to the mixture to dissolve the hydroxide and leave behind antimony trioxide.
REFERENCES:
patent: 796849 (1905-08-01), MacArthur
patent: 975148 (1910-11-01), Masson
patent: 1548854 (1925-08-01), Schleicher
patent: 1646734 (1927-10-01), Marden
patent: 3723267 (1973-03-01), Baiborodov et al.
patent: 3883345 (1975-05-01), Caldon et al.
Kronman Albert F.
Ozaki G.
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