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Alexandr V Peredereev

Raisa V Ivanova

Ivan M Kostin

Isaak A Zatulovsky

Nikolai S Shmorgunenko

Arkady A Belsky

Alexandr V Eljutin

Nikolai A Novikov

Khoren A Badaliants

Leonid I Finkelshtein

Leonid M Butorin

Elena L Shalavina

Tatyana D Ostapenko

Arkady I Zazubin

Anna E Danilina

Askar M Kunaev

Nikolai Ivanovich Eremin

Georgy P Tkachenko

Evgeny A Isakov

Vladimir N Abrjutin

Mikhail Ivanovich Zaitsev

Anatolia T Simanova

Ljubov B Samaryanova

Natalya V Tishevetskaya

Vyacheslav A Kirichenko

Oleg N Kalashnik

Larisa I Sinelnikova

Vyacheslav P Ezhkov

Garegin A Peikarov

Gennady A Panasko

Vladimir V Kozhemyakin

Greogy I Lazarev

Petr V Fedorin

Galina E Masjuk

Vladimir V Krasavin

Avgusta I Samoilova

Anatolia I Simanova

Jury G Pukhov

Evgeny M Steshenko

Petr F Minin

Teodor G Milberger

Jury N Evseev

Ioan V Davydov

Gennady A Romanov

A process for producing high-purity gallium from gallium-arsenic containing wastes resulting from the manufacture of semiconductors which comprises a vacuum-thermal decomposition of said wastes under a residual pressure of from 1.10.sup.-1 to 1.10.sup.-2 mm Hg while elevating temperature to from 25.degree. to 1,150.degree. C. at variable heating rates ranging from 0.5.degree. to 20.degree. C./min. The vacuum-thermal decomposition of the wastes is accompanied by sublimation of arsenic which is condensed. The resulting melt of gallium is cooled to a temperature of from 50.degree. to 100.degree. C. at variable cooling rates ranging from 0.05.degree. to 15.degree. C./min. Then the melt of gallium is filtered at the cooling temperature of the melt. The filtered gallium melt is subjected to a hydrochemical treatment. The melt of gallium having passed the hydrochemical treatment is subjected to a fractional multi-stage crystallization to crystallize gallium in an amount of from 60 to 95% by mass of its initial charge in each stage; the metal residues enriched with impurities are recycled from each subsequent stage to each preceding one.

Process for producing high-purity gallium

The starting aluminate-alkaline solutions are subjected to two-stage carbonization with stirring and the production of hydrate of aluminum oxide, a gallium-containing precipitate, and solutions containing caustic and bicarbonate alkali, thereafter the produced gallium-containing precipitate is mixed with a solution containing caustic alkali to achieve a content of gallium in the solution of 0.05 to 1 g/l, the precipitate thus formed is separated and the solution enriched with gallium is mixed with a solution containing bicarbonate alkali, the produced mixture is evaporated to separate compounds of alkali metals, and the evaporated solution is carbonized to produce a solution containing alkali metal salts, and a gallium concentrate from which gallium is produced by transforming it into alkaline solution and subsequently reducing electrochemically. The proposed method makes it possible to extract gallium at a comparatively low cost from solutions in the processing, for example, of nephelines containing it in amounts which do not exceed 0.02 to 0.03 g/l. Owing to the proposed method it has become possible in the processes of concentration of gallium to produce a number of valuable components such as alkali metal salts contained in the starting ore.

Method for extraction of gallium from aluminate-alkaline solutions in

A process for recovering gallium from alkali aluminate solutions which consists in that the starting alkali aluminate solution is neutralized to a concentration of the caustic alkali of from 0.1 to 10 g/l, whereafter the neutralized liquor is evaporated to a concentration of the caustic alkali therein of from 30 to 150 g/l. Then the evaporated solution is corrected to obtain the ratio between the alkali metal oxide and alumina of above 2.0. The corrected solution is treated with a liquid alloy of gallium containing an element possessing an oxidizing potential exceeding that of gallium to give a concentrate containing more than 90% of gallium by mass, wherafter gallium of a higher purity grade is recovered from the resulting concentrate by the electrochemical method. The process according to the present invention makes it possible to recover gallium from alkali solutions resulting from the treatment of nephelines with the production of a 90% gallium concentrate, wherefrom gallium of an increased purity is obtained at relatively low cost. Processing of the concentrate with the production of gallium is simple, it is not encountered with any additional expenses and requires no additional equipment. Another advantage of the process resides in a more comprehensive utilization of low-grade aluminum-containing ores.

Process for recovering gallium from alkali aluminate solutions resulting

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Moscow, Russia

Alexandr V Peredereev