Method for simultaneous use of a single additive for coal flotation, dewatering, and reconstitution
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United States of America Patent
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Jan 10, 1995
Grant Date -
N/A
app pub date -
Nov 9, 1993
filing date -
Nov 9, 1993
priority date (Note) -
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Abstract
A single dose of additive contributes to three consecutive fine coal unit operations, i.e., flotation, dewatering and reconstitution, whereby the fine coal is first combined with water in a predetermined proportion so as to formulate a slurry. The slurry is then mixed with a heavy hydrocarbon-based emulsion in a second predetermined proportion and at a first predetermined mixing speed and for a predetermined period of time. The conditioned slurry is then cleaned by a froth flotation method to form a clean coal froth and then the froth is dewatered by vacuum filtration or a centrifugation process to form reconstituted products that are dried to dust-less clumps prior to combustion.
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