Dewatering of Alaska placer effluent using PEO.
Sharma-SK; Scheiner-BJ; Smelley-AG
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9442, 1992 Jan; :1-10
The U.S. Bureau of Mines has been investigating new techniques to improve the dewatering of mineral slurries, to recover water lost in the waste slurry, and to produce dewatered solids suitable for disposal. As part of this investigation, a study was undertaken to investigate the feasibility of dewatering Alaska placer effluent. Based on the laboratory tests, preliminary field tests were conducted on three placer mines in Alaska. At these mines, the water recovered from the placer effluent (250 to 23,000 NTU) exhibited turbidities of 20 to 240 NTU. In the second year of the project, a large-scale dewatering unit was set up at a mine located in the Livengood District. The feed, at flow rates up to 935 gpm, was mixed with dilute PEO solution in a flexible plastic hose with and without static mixers. Feed to the dewatering unit generally ranged between 300 and 26,500 NTU and required PEO dosages of 0.02 to 0.14 lb per 1,000 gal to produce water from the screen underflow with turbidities of 20 to 50 NTU. During this period, a small unit was also operated at flow rates of 10 to 25 gpm at seven sites throughout Alaska, with the effluent from four of the sites being dewatered successfully.
Mining-industry; Waste-treatment; Waste-disposal; Mineral-processing
IH; Report of Investigations
NTIS Accession No.
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9442