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Mikhail Ivanovich Zaitsev

Nikolai S Shmorgunenko

Nikolai Ivanovich Eremin

Nikolai A Kaluzhsky

Ivan M Kostin

Isaak A Zatulovsky

Alexandr V Eljutin

Khoren A Badaliants

Raisa V Ivanova

Nikolai A Novikov

Alexandr V Peredereev

Vladimir Nikolaevich Kostin

Leonid I Finkelshtein

Tatyana D Ostapenko

Anna E Danilina

Leonid M Butorin

Semen Alexandrovich Tager

Arkady I Zazubin

Elena L Shalavina

Anatolia I Simanova

Mikhail Yakovlevich Shpirt

Greogy I Lazarev

Lev Nikolaevich Bobkov

Vladlen Iosifovich Panin

Vladimir V Krasavin

Viktor Mikhailovich Kozlov

Ioan V Davydov

Gennady A Panasko

Ljubov B Samaryanova

Abram Zinovievich Jurovsky

Avgusta I Samoilova

Larisa I Sinelnikova

Evgeny M Steshenko

Fritiof Meerovich Yakhilevich

Jury N Evseev

Petr V Fedorin

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

The invention relates to a process for the production of alumina from mineral component of solid fuels containing aluminum, silicon and iron oxides. The process comprises burning a mixture of a solid fuel with limestone in the following molar ratios of limestone to said oxides: CaO:SiO.sub.2 =2.0, CaO:Al.sub.2 O.sub.3 =1.3-1.8, CaO:Fe.sub.2 O.sub.3 =1.0, at 1700.degree.-1900.degree. C. As a result, a melt is obtained containing calcium compounds: 2CaO.SiO.sub.2, 12CaO.7Al.sub.2 O.sub.3, CaO.Al.sub.2 O.sub.3, CaO.Fe.sub.2 O.sub.3. The melt is cooled and leached with soda solutions for extracting alumina. The sludge remaining after the leaching is suitable for Portland cement production. The invention enables a considerable enlargement of the range of starting products for aluminum and cement industries due to the use of the mineral component of solid fuels, an about twofold reduction of capital investments in the alumina production and reduction of the fuel consumption by 30-40%.

Process for the production of alumina from the mineral component of

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Moscow, Russia

Mikhail Ivanovich Zaitsev