The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 1976
Filed:
Jul. 03, 1974
Karoly Solymar, Budapest, HU;
Janos Zambo, Budapest, HU;
Marika Orban nee Kelemen, Budapest, HU;
Erno Bujdoso, Budapest, HU;
Ivan Feher, Budapest, HU;
Zoltan Ozvald, Budapest, HU;
Istvan Voros, Budapest, HU;
Tibor Ferenczi, Budapest, HU;
Pal Toth, Budapest, HU;
Ferenc Lazar, Tatabanya, HU;
Tihamer Pinter, Budapest, HU;
Gyorgy Sigmond, Budapest, HU;
Peter Siklosi, Budapest, HU;
Kalman Wentzely, Almasfuzito, HU;
Laszlo Lengyel, Almasfuzito, HU;
Jozsef Matyasi, Almasfuzito, HU;
Other;
Abstract
A method for processing bauxites according to the Bayer technology, with an increased yield in Al.sub.2 O.sub.3 and with decreased caustic soda losses, starting particularly from goethite bauxites of boehmite and/or diaspore type and carrying out the digestion at 180.degree.C to 300.degree.C using an aluminate liquor containing Na.sub.2 O.sub.caustic in a concentration of 80 to 300 g./l. The digestion is carried out in the presence of a calcium compound in an amount corresponding to 2 to 6 % of CaO calculated for the dry weight of bauxite and of a sulfate salt in an amount corresponding to 1.0 to 7.0 g./l. of sulfate ion concentration, whereby the goethite content of the bauxite is converted into hematite. The process provides advantageous conditions for the complete dissolution of the boehmite and diaspore content of bauxite in the vicinity of the equilibrium molar ratio, and enables to recover efficiently the caustic soda losses in the Bayer process itself, requiring no supplementary operation.