Method and apparatus for beneficiating phosphate ores
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United States of America Patent
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Apr 13, 1982
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N/A
app pub date -
Feb 25, 1980
filing date -
Feb 25, 1980
priority date (Note) -
Expired
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Abstract
Method and apparatus for producing high grade phosphate rock from low grades, slime or tailings by subjecting the low grade rock, slime or tailings to a calcination treatment at a temperature within the range from 1000.degree. F. to 1600.degree. F., and preferably from 1400.degree. F. to 1600.degree. F., until a fraction of said rock, slime or tailings becomes magnetically attractable, and subjecting the treated material to a high strength magnetic field to separate the same magnetically into at least two fractions, one of increased BPL and one of decreased BPL.
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