NIOSHTIC-2 Publications Search

Thickening fine coal refuse slurry for rapid dewatering and enhanced safety.

Authors
Stewart BM; Backer RR; Busch RA
Source
MISSING, 1986; :1-12
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).
Keywords
Coal; Coal mining; Refuse collection; Waste disposal; Waste treatment; Polymers; Waste disposal systems; Solid waste; Solid waste disposal; Mining; Mine safety; Weight factors; Weight measurement
Publication Date
19860101
Document Type
IH; Report of Investigations
Fiscal Year
1986
Identifying No.
RI 9057
NIOSH Division
SRC
Source Name
MISSING
State
WA
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division