Magyar Aluminiumipari Troszt

Femipari Kutato Intezet

Aluterv Aluminiumipari Tervezo Vallalat

Almasfuzitoi Timfoldgyar

Maria Orban Nee Kelemen

Jozsef Zoldi

Gyula Horvath

Karoly Solymar

Jozsef Matyasi

Jozsef Boros

Bela Toth

Istvan Voros

Ferenc Toth

Tibor Ferenczi

Laszlo Revesz

Janos Zambo

Peter Siklosi

Laszlo Lengyel

Ferenc Vallo

Tihamer Pinter

Ferenc Sitkei

Kalman Wentzely

Miklos Schlegel

Ferenc Lazar

Gyorgy Sigmond

Benjaminne Toth

Lajos Szoke

Janosne Losonczi

Gyorgy Baksa

Balazs Ihasz

Matyas Rainiss

Zoltan Pais

The invention relates to a process for the reduction of sodium hydroxide losses of the Bayer-cycle by modified causticization of red mud which comprises

Process for the reduction of the sodium hydroxide losses of the

The invention relates to a new method of reducing the organic substance content of alum earth production cycle performed according to the Bayer technology. By the method of the invention the majority of the organic substances present in the circulating lye can be removed easily and with only slight losses in sodium content. According to the invention one proceeds so that soda present in the hydrate wash and/or in the soda salt solution is caustified with lime, the solution is evaporated to reach a total sodium oxide concentration of 200 to 400 g/l, the precipitated solid is separated and removed from the system, and the liquid is recycled.

Method of decreasing the organic substance content of alum earth

The invention relates to an improved process for the production of alumina according to the Bayer technology, of bauxites containing goethite and especially of boehmitic or diasporic bauxites, for the acceleration of the digestion process, for the transformation of goethite into hematite, for the increase of alumina yield and for the reduction of the caustic soda losses, the essence of which consists in carrying out the digestion in the presence of 2-6% CaO and 0.2-2.0% Mg.sup.++, Fe.sup.++, Mn.sup.++ Co.sup.++ ions based on the weight of the dry bauxite or of compounds or ores containing these ions in the indicated quantities.

Process for digesting goethite-containing bauxites according to the

Growing community of inventors

Budapest, Hungary

Maria Orban Nee Kelemen