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US Patent 6041939 - Beneficiation with selective flocculation using hydroxamates
US Patent Issued on March 28, 2000
Estimated Patent Expiration Date:
March 20, 2018Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
March 20, 2018Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA process which uses selective flocculation with hydroxamates for the beneficiation of mixtures of mineral particles (such as kaolin clays). The increased selectivity of hydroxamates for certain mineral phases within kaolin clays and other mixtures of mineral particles improves the process over selective flocculation processes utilizing other activators.Other References
| InventorsAssigneeApplicationNo. 045842 filed on 03/20/1998US Classes:209/5, Deflocculation and flocculation209/3, PRECEDENT PREPARATION OF ITEMS OR MATERIALS TO FACILITATE SEPARATION210/723, Utilizing precipitant, flocculant, or coagulant, each with accelerator or with each other or plural precipitants, flocculants, or coagulants423/23, Group IB metal (Cu, Ag, or Au)423/69, Group IVB metal (Ti, Zr, or Hf)423/155Alkaline earth metal (Mg, Ca, Sr, or Ba)Field of Search209/3, PRECEDENT PREPARATION OF ITEMS OR MATERIALS TO FACILITATE SEPARATION209/4, Selective differentiation209/5, Deflocculation and flocculation423/23, Group IB metal (Cu, Ag, or Au)423/69, Group IVB metal (Ti, Zr, or Hf)423/155, Alkaline earth metal (Mg, Ca, Sr, or Ba)210/723, Utilizing precipitant, flocculant, or coagulant, each with accelerator or with each other or plural precipitants, flocculants, or coagulants210/725, Utilizing organic precipitant210/736Derived from alkyl halide or epihalophydrin reactantExaminersPrimary: Nguyen, Tan T.Attorney, Agent or FirmUS Patent References2660303, 3701417, 3808021, 3826365, 3837482, 3857781, 3862027, 4604369, Method of beneficiating kaolin clay utilizing ammonium saltsIssued on: 08/05/1986 Inventor: Shi4629556, Purification of kaolin clay by froth flotation using hydroxamate collectors Issued on: 12/16/1986 Inventor: Yoon , et al.4871466, Novel collectors and processes for making and using same Issued on: 10/03/1989 Inventor: Wang , et al.4929343, Novel collectors and processes for making and using same Issued on: 05/29/1990 Inventor: Wang, et al.5368745, Method of flocculating low metal oxide content solids in a liquid Issued on: 11/29/1994 Inventor: Rothenberg, et al.5516435, Blends of hydroxamated polymer emulsions with polyacrylate emulsions Issued on: 05/14/1996 Inventor: Lewellyn 5522986, 5535890, Method for separating mixture of finely divided minerals Issued on: 07/16/1996 Inventor: Behl, et al.5584394, Colored titaniferous coating pigment obtained as a flocculated by-product in a kaolin purification process Issued on: 12/17/1996 Inventor: Behl, et al.5603411, Method for separating mixture of finely divided minerals Issued on: 02/18/1997 Inventor: Williams, et al.5685900, Method for beneficiating discolored kaolin to produce high brightness coating clay Issued on: 11/11/1997 Inventor: Yuan, et al.5810998Process for improving the brightness of fine-grained kaolin clays Issued on: 09/22/1998 Inventor: Arrington-Webb, et al. Foreign Patent References
International ClassB03B 001/00 |
