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Nikolai Ivanovich Eremin

Nikolai S Shmorgunenko

Mikhail Ivanovich Zaitsev

Nikolai A Kaluzhsky

Ivan M Kostin

Gakif Zakirovich Nasyrov

Isaak A Zatulovsky

Raisa V Ivanova

Nikolai A Novikov

Alexandr V Eljutin

Khoren A Badaliants

Alexandr V Peredereev

Leonid I Finkelshtein

Vladimir Nikolaevich Kostin

Leonid M Butorin

Elena L Shalavina

Boris Alexandrovich Stolyar

Tatyana D Ostapenko

Anna E Danilina

Arkady I Zazubin

Ilya Z Pevzner

Semen Alexandrovich Tager

Evgeny M Steshenko

Lev Nikolaevich Bobkov

Petr V Fedorin

Alexandr Vladimirovich Bogdanov

Jury N Evseev

Anatolia I Simanova

Larisa I Sinelnikova

Dmitry E Subochev

Alexandr S Ryzhkov

Leonid S Nisse

Greogy I Lazarev

Abram Zinovievich Jurovsky

Vladimir V Krasavin

Fritiof Meerovich Yakhilevich

Mikhail Yakovlevich Shpirt

Vitaly Y Tumarinson

Viktor Mikhailovich Kozlov

Ioan V Davydov

Vladlen Iosifovich Panin

Gennady A Panasko

Ivan Terentievich Yamin

Ljubov B Samaryanova

Avgusta I Samoilova

A process for the production of sodium aluminate comprising drying an aluminate solution containing from 45 to 350 g/l of caustic Na.sub.2 O with a molecular ratio of caustic Na.sub.2 O to Al.sub.2 O.sub.3 from 1.1 to 1.8 in a fluidized bed of solid particles at 250.degree.-400.degree. C. of sodium aluminate using a gas heated to 750.degree.-950.degree. C. containing no carbon dioxide as a fluidizing medium and a heat carrier in an amount from 2000 to 25000 nm.sup.3 per 1 m.sup.3 of aluminate solution; feeding said aluminate, solution for drying by atomizing it at a velocity from 25 to 35 m/s thereby obtaining sodium aluminate in the form of pellets of a size from 0.5 to 8 mm with a bulk weight from 1.2 to 1.4 t/m.sup.3 completely soluble in water and alkaline solutions, with a maximum content of hygroscopic moisture of 0.3% by weight and a maximum content of water of crystallization of 5% by weight. The process is simple as regards the manufacturing technique and equipment; it is characterized by stable operating conditions and high quality of the end product.

Process for the production of sodium aluminate

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

A method for processing alunite consisting in that alunite ore is treated with a solution of caustic alkalis at a maximum temperature of 60.degree.C, and a solid residue resulting from the above operation and containing largely potassium and sodium sulphates, is washed with hot water. As a result, potassium and sodium sulphates are dissolved in the wash water, and potassium sulphate is isolated by the action of a caustic-potash solution. The method enables losses of alkalis and aluminium during processing alunite ores containing active forms of silicon compounds to be much reduced, which compound when treating alunite ores with a solution of caustic alkalis, are liable to form insoluble aluminosilicates which are discarded into slime and thus lost together therewith when the latter is separated from the process solution.

Method of producing alumina and potassium sulphate from alunite

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Saint-Petersburg, Russia

Nikolai Ivanovich Eremin