Two stage compound spiral separator and method
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United States of America Patent
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Jul 16, 1996
Grant Date -
N/A
app pub date -
May 3, 1994
filing date -
May 3, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Coal spiral having a relatively short first stage helix for separating a slurry into clean coal, refuse and middlings splits, and a relatively short second stage helix for recleaning middlings split from the first stage. The first stage has only 3.25 turns, the second stage has only two turns, and a combination separator box and feed box delivers the middlings directly from the first stage to the second. The two helices are aligned coaxially, and are of opposite rotational sense to provide counter-rotation of the middlings in the two stages.
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