发明名称 |
Densification of phosphatic wastes and phosphoric acid slimes and solvent recovery |
摘要 |
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.
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申请公布号 |
US4530764(A) |
申请公布日期 |
1985.07.23 |
申请号 |
US19830514396 |
申请日期 |
1983.07.18 |
申请人 |
OCCIDENTAL RESEARCH CORPORATION |
发明人 |
THOMAS, IRAN L.;LAI, CHUNG J. |
分类号 |
B01D29/07;B01D35/22;C02F1/44;(IPC1-7):B01D13/00 |
主分类号 |
B01D29/07 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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