Method and system for recovering coal fines from pipe line coal slurry
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United States of America Patent
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-
Oct 1, 1985
Grant Date -
N/A
app pub date -
Jan 9, 1984
filing date -
Jan 9, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and system for dewatering coal fines from the centrate of a pipeline slurry centrifuge, to recover the coal and purify the water, includes blending the centrate from the centrifuge with slurry from the pipeline in the proportion of about 4:1. The blend is chemically conditioned agglomerating polymer, and then dewatered on a belt press. The cake from the belt press is dry enough to burn in the boiler, and the filtrate is clarified in a gravity clarifier. The clarifier effluent is clean enough for plant purposes or to return to the environment, and the clarifier underflow is returned to the blend for dewatering in the belt press. In a second embodiment, the blend is dewatered directly in a disphragm filter press without chemical conditioning, and the filtrate is clean enough to use directly without clarifying.
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