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Thickening Fine Coal Refuse Slurry for Rapid Dewatering and Enhanced Safety.

Authors
Stewart-BM; Backer-RR; Busch-RA
Source
MISSING :12 pages
Link
NIOSHTIC No.
10005461
Abstract
To decrease the potential for fine coal waste slurry impoundment failures, the Bureau of Mines investigated a new disposal technique. The fine coal waste slurry is rapidly thickened (i.e., dewatered) and deposited on a slightly sloping surface. To accomplish rapid dewatering, a chemical flocculation system using polymers was developed to treat the fine coal waste slurry stream. The fine solids formed flocs, settled from suspension, and rapidly released excess water. During the last 5 days of the field test, slurry flowing at rates from 498 to 675 gal/min with a specific gravity range of 1.15 to 1.33 Was successfully treated and dewatered. During this period, untreated slurry had an average moisture content of 227.4 pct (30.7 Wt pct solids). The effectiveness of the dewatering system was determined by monitoring the moisture content of the deposited waste with respect to time. Sixty-five hours after ending the field test the average moisture content was 54.9 pct (64.5 Wt pct solids); 68 days after the field test the average moisture content was 28.8 pct (78.0 Wt pct solids).
Publication Date
19860101
Document Type
IH; Report of Investigations
Fiscal Year
1986
NTIS Accession No.
NTIS Price
Identifying No.
RI 9057
NIOSH Division
SRC;
Source Name
MISSING
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