Treatment of phosphate rock slimes by freezing |
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| 申请号 | US3681931D | 申请日 | 1970-03-11 | 公开(公告)号 | US3681931A | 公开(公告)日 | 1972-08-08 |
| 申请人 | HAZEN RESEARCH; | 发明人 | HADZERIGA PABLO; | ||||
| 摘要 | This process is a method of treating an aqueous inorganic colloidal suspension to make it amenable to separation by decantation, filtration, and centrifugation and comprises statically freezing the suspension and thawing the thus frozen suspension prior to separation by decantation, filtration, and centrifugation. In the preferred embodiment of the process, the suspension is kept in a frozen state for a predetermined length of time after the static freezing. This process is particularly adept at making phosphate rock slimes amenable to separation by the above-named methods. | ||||||
| 权利要求 | 2. The method as defined in claim 1 wherein the frozen suspension is statically thawed in the thawing step. 3. The method as defined in claim 1 wherein the freezing temperature is between -1* and -100* C. 4. The process as defined in claim 1 wherein the freezing temperature is between about -20* and -80* C. 5. The method as defined in claim 1 wherein the total solids content of the phosphate rock slime is between about 5 percent and about 10 percent. 6. The meThod as defined in claim 1 wherein the phosphate rock slime is an acid leached phosphate slime. 7. The method as defined in claim 1 wherein the freezing temperature is about -20* C. 8. The method as defined in claim 7 wherein the phosphate rock slime is kept in a frozen state for at least about 24 hours. 9. A process for the treatment of phosphate rock slimes which comprises: subjecting the phosphate rock slimes to a freezing temperature, without agitation of the suspension, for a period sufficient to separate and freeze a substantial portion of the water therein; subjecting the phosphate rock slimes to a thawing temperature without agitation for a period sufficient to melt the frozen water therein to yield a bottom layer of phosphate rock slimes concentrated suspension and an upper layer of liquid containing essentially water and dissolved matter; and filtering off the upper thawed liquid layer from the thawed concentrated suspension. 10. The process defined in claim 9 including the additional step of keeping the phosphate rock slimes in a frozen state for a predetermined length of time after the freezing step. 11. The process defined in claim 9 including the additional step of decanting the upper layer of liquid from the thawed phosphate rock slimes prior to the filtration step. 12. The process defined in claim 9 including the additional step of centrifuging the thawed phosphate rock slimes to effect further concentration of the concentrated suspension prior to the filtering step. 13. The process defined in claim 9 wherein the phosphate rock slime is an acid leached phosphate rock slime. 14. The process defined in claim 9 wherein the freezing temperature is between about -20* C. and about -80* C. |
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