Chemistry of inorganic compounds – Extracting – leaching – or dissolving
Patent
1980-12-03
1983-01-04
Carter, Herbert T.
Chemistry of inorganic compounds
Extracting, leaching, or dissolving
423132, 423150, 423155, 423335, B01D 1100, B01F 100
Patent
active
043672159
ABSTRACT:
A method of leaching of the metal contents in natural silicates by means of mineral acids to produce a metal-containing leaching liquid and a solid residue is disclosed. The silicate is first crushed but the grain size of substantially all of it is kept above 0.1 mm. It is then leached for a period of time sufficient to form a solid residue consisting chiefly of silica. The process is controlled so that the grains do not change in size or shape in the course of the leaching process. The silicate to be leached may be anorthosite or olivinrich rock and the solid residue from the leaching process may be utilized for building material, as a source for silicon in industrial processes, as a catalyst or carrier of catalysts or as an absorbent.
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Gjelsvik Norvald
Torgersen Jan H.
Carter Herbert T.
Elkem a/s
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