C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/240
C22B 21/06 (2006.01) C01F 7/06 (2006.01)
Patent
CA 1052583
ABSTRACT OF THE DISCLOSURE PROCESS FOR DIGESTING GOETHITE-CONTAINING BAUXITES ACCORDING TO THE BAYER TECHNOLOGY The invention relates to a process for the production of alumina according to the Bayer technology, of bauxites containing goethite and especially of boehmitic or diasporic bauxites, further for the acceleration of the digestion process, for the transformation of goethite into hematite, for the increase of the alumina yield and for the reduction of the caustic soda losses, the essence of which consists in that the digestion is carried out in the presence of 0.2-2.0 % Mg++ and/or Fe++ and/or Mn++ and/or Co++ ions reckoned upon the weight of the dry bauxite or of compounds and/or ores containing these ions in the indicated quantity. The process can be advantageously used simultaneously with the CaO-addition, also with digesting liquor containing NaCl and/or Na2SO4. The above mentioned bivalent ions are catalyzing the solubility of aluminium minerals and the transformation of goethite into hematite, the minimum required temperature of which can be reduced to 230 °C and for the transformation even 20 minutes at 240 °C and 2 minutes at 260°C are sufficient. The process can be highly advantageously used in the tube digesting equipment. The above enumerated bivalent cations reduce by further 10 % the losses of Na2O bound to the red mud, as compared with the technology applying CaO + Na2SO4-addition considered as optimum until now and increase by about 15 % the filtering capacity of red mud.
242558
Boros Jozsef
Ferenczi Tibor
Horvath Gyula
Lazar Ferenc
Lengyel Laszlo
Almasfuzitoi Timfoldgyar
Aluterv Aluminiumipari Tervezo Vallalat
Femipari Kutato Intezet
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