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Dewatering Florida Phosphatic Clay Wastes With Moving Screens.

Authors
Brandt-LW
Source
MISSING :16 pages
Link
NIOSHTIC No.
10002054
Abstract
The Bureau of Mines, as part of its mission to effect pollution abatement, conducted research to study various means of dewatering Florida phosphatic clay wastes and reclaiming mined lands. The work was done in cooperation with 10 Florida phosphate companies. During this work, a novel technique to effectively dewater phosphatic clay wastes was developed. The solids contained in the clay waste slurry are slowly compressed by moving wire mesh screens through the system. In a typical application, the screens were moved downward, compressing solids ahead of the screens. The rate of movement of the screens is an important variable in the process. It is believed that the moving screens distort the gel structure of the phosphatic clay system and cause the release of water. Samples of 18 clay wastes, including a high-grade attapulgite from beneficiation plants of the Florida phosphate field, were studied using the method. Typical samples were concentrated from initial solids of 4.7 And 11.9 percent to 16.8 and 25.2 percent, respectively, in 3-1/2 days. The high-grade attapulgite sample was dewatered from 2.7 percent solids to 13 percent solids in the same period.
Publication Date
19810101
Document Type
IH; Report of Investigations
Fiscal Year
1981
NTIS Accession No.
NTIS Price
Identifying No.
RI 8529
NIOSH Division
TURC;
Source Name
MISSING
State
FL;
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