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Dewatering Florida Phosphate Pebble Rock Slime by Freezing Techniques.

Authors
Stanczyk-MH; Feld-IL; Collins-EW
Source
NTIS: PB 200 702 :20 pages
Link
NIOSHTIC No.
10009771
Abstract
Freezing to dewater typical Florida phosphate rock slime as demonstrated in laboratory tests appeared to have potential commercial use because of indicated moderate energy requirements, good compaction of dewatered solids, and effective recovery of usable water. After freezing, thawing, decanting, and filtering, batch freezing of gallon-size 13.7 percent solids slime samples yielded 42 percent solids products. Cationic amine, used as a process additive, yielded 46.8 percent solids product with significant filter area reduction. Semicontinuous 8-stage freezing tests also produced thickened slimes. Cooling and freezing 13.7 percent solids slime from 30 deg to minus 10 deg c required removal of 183 btu per pound of slime; carnot cycle calculation indicated that the theoretical minimum energy to transfer this heat was 27.8 Btu per pound. To produce 1 ton of 44 percent solids slime from 13.7 percent solids slime, the calculated theoretical energy required for cooling and freezing was 52.3 Kilowatt-hours. During the research, heat capacity and heat of fusion data were determined for the slime at various percent solids. Work done in cooperation with the University of Alabama.
Publication Date
19710101
Document Type
IH; Report of Investigations
Fiscal Year
1971
NTIS Accession No.
PB-200702
NTIS Price
A03
Identifying No.
RI 7520
NIOSH Division
TURC;
Source Name
NTIS: PB 200 702
State
AL; FL;
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