Two stage compound spiral separator and method

Details Two stage compound spiral separator and method Two stage compound spiral separator and method

1994-05-03

1996-07-16

Bollinger, David H.

Classifying, separating, and assorting solids

Fluid suspension

Liquid

209208, 209210, 209725, 209459, B03B 566

Patent

active

055358926

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.

REFERENCES:
patent: 2724498 (1955-11-01), Beresford
patent: 4747943 (1988-05-01), Giffard
patent: 4795553 (1989-01-01), Giffard
patent: 5184731 (1993-02-01), Robertson et al.

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