Densification of phosphatic wastes and phosphoric acid slimes an

Details Densification of phosphatic wastes and phosphoric acid slimes an Densification of phosphatic wastes and phosphoric acid slimes an

1983-07-18

1985-07-23

Hruskoci, Peter

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210651, 210806, 210907, B01D 1300, C02F 144

Patent

active

045307644

ABSTRACT:
Phosphatic wastes produced during the mining and beneficiation of phosphate ore are concentrated by treatment in a crossflow filter under conditions which prevent the formation of a filter cake on the filtering surface. Slimes having an initial concentration of suspended solids, usually less than about 5% suspended solids, can be treated in series of crossflow filters to concentrate the solids to 24% or higher. In one embodiment a series of three spiral-wound crossflow filters followed by a fourth stage tubular crossflow filter is used to concentrate a slime having about 3% suspended solids to a concentrate having 30% or more suspended solids. By maintaining the linear velocity over the surface of the filter medium at 5 ft/sec. or higher a relatively high permeation rate can be achieved while producing a permeate having an extremely low suspended solids concentration. Proper selection of filter medium and flow rates can produce permeates having a turbidity less than about 5 Jackson Turbidity Units.

REFERENCES:
patent: 3401798 (1968-09-01), Nyrop
patent: 3472765 (1969-10-01), Budd et al.
patent: 3835040 (1974-09-01), Mahlman et al.
patent: 4242193 (1980-12-01), Moeglich
patent: 4301013 (1981-11-01), Setti et al.
patent: 4313830 (1982-02-01), Tulin et al.
Minturn, "Advanced Techniques for Aqueous Processing & Pollution Abatement" Oak Ridge Nat. Lab., Final Report, Aug. 1974.
Bureau of Mines Information Circular, IC 8668, 1975, pp. 1-20.

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