| 摘要 |
<p>TITLE A METHOD OF RECLAIMING WATER AND COAL FROM COAL TREATMENT UNDERFLOW BY TWO-STAGE SEPARATION OF SOLIDS Water as well as coal are reclaimed from an aqueous slurry of coal and ash fines by first adding to an aqueous slurry of coal and ash fines a liquid lyophobic to water and ash and lyophilic to coal to form a first mixture. Preferably, the processed aqueous slurry is formed by mixing a low solids aqueous slurry of coal and ash fines from a coal washer with a high solids aqueous slurry of coal and ash fines from a settling pond. The first mixture is then agitated to agglomerate the coal fines, and the agglomerated coal fines are separated from the mixture to form a substantially non-coal aqueous slurry. A preferably high molecular weight flocculant lyophobic to water and lyophilic to ash is thereafter added to said non-coal aqueous slurry to form a second mixture, and flocculated solids precipitated from the second mixture to separate water from the second mixture. Flocculated solids are then separated from the second mixture to form a substantailly solids-free aqueous solution. Preferably, the separated water is recirculated to a coal washing plant, and the solids-free aqueous solution is recirculated to the second mixture, or a coal washing plant, to form a closed water system for a coal washing plant.</p> |
