Method for processing solid raw materials such as minerals...

Details Method for processing solid raw materials such as minerals... Method for processing solid raw materials such as minerals...

B - Operations, Transporting

02

C

241/141

B02C 23/08 (2006.01) B03B 1/02 (2006.01) C22B 1/00 (2006.01)

Patent

CA 1133447

Abstract of the Disclosure A method of beneficiating spathic magnesite ore depends upon a special characteristic thereof that has been realized, namely that it decrepitates or disintegrates into grains when heated to temperatures below its chemical conversion reaction temperatures whereas its common impurities do not. The ore is therefor heated to such a temperature below its calcining temperature and the resultant material graded according to grain size when the finer grain fraction will be enriched with the magnesite and the coarser grain fraction will be enriched with the usual calcite and/or dolomite impurities. Depending upon the degree of purity required one would select smaller and smaller grain size fractions for increasing purity and, for example, one would then discard fractions of grain sizes greater than 5 mm, 3mm or 1 mm as waste. The separated finer grain size fraction can be subjected to a second decrepitating step.

341983

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