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Benefication of Coal by Selective Flocculation, a Laboratory Study.

Authors
Hucko-RE
Source
NTIS#: PB 271 241 :16 pages
Link
NIOSHTIC No.
10007802
Abstract
The Bureau of Mines conducted a laboratory scale investigation of the process of selective flocculation with the objective of developing a method to effect separations on suspensions consisting predominately of ultra-fine-size (minus 400-mesh) particles of coal and refuse. Selective flocculation of coal from coal-refuse slurries could be achieved with a wide variety of reagents. Typically as much as 15 to 20 weight-percent of high-ash solids (70 to 80 percent ash) could be retained in suspension. The flocculated sediment remained a high-ash product, however, and would require further treatment to be regarded as clean coal. No combination of reagents and conditions led to selective flocculation of the refuse component. The dispersing agent was found to be the critical factor; dosages of 3 to 8 lb/ton were necessary to stabilize the suspension for subsequent selective flocculation. In addition, most of the dispersants that worked were most effective at substantially elevated ph (11 or so). It was concluded that this process would be prohibitively expensive and, because of yield and quality constraints, it would be of questionable utility in today's coal preparation industry.
Publication Date
19770101
Document Type
IH; Report of Investigation;
Fiscal Year
1977
NTIS Accession No.
PB-271241
NTIS Price
A03
Identifying No.
RI 8234
NIOSH Division
PRC;
Source Name
NTIS#: PB 271 241
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