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Title: Studies on effective utilization of precipitates from neutralized mine drainage

Mine drainage has high acidity and sometimes contains more than the allowable concentration of ionized iron. In such a case, mine drainage is neutralized with calcium carbonate and calcium hydroxide to separate precipitates, such as the iron hydroxide and gypsum generated. Currently, most of these precipitates are not utilized and are accumulated in tailing dams. As a result, the service life of the tailing dams is reduced. This becomes a matter of concern, since securing sites for such dams is difficult. A most effective means of solving this problem would be to promote utilization of these neutralized precipitates. This paper reports on the results of studies on neutralized precipitates produced at the old Matsuo Mine (Iwate Prefecture), which has the largest neutralization treatment facility in Japan. As a result of the studies, the following was proposed regarding application of neutralized precipitates. Utilization as ferrite: mix ferrous hydroxide and ferric hydroxide in water to synthesize magnetite-like ferrite, to be used in the manufacture of magnetic markers for a mobility support system for blind pedestrians, or in producing magnetic fluids for sink-and-float separation of nonmagnetic metals and nonmetals. Utilization as hematite: bake ferric hydroxide to produce hematite, thereby extracting metallic iron formore » paint pigment as well as for the manufacture of ironware by local industry. Production of aluminum sulfate: precipitate aluminum ions from water and add sulfuric acid to produce aluminum sulfate.« less
Authors:
 [1]
  1. Waseda Univ., Tokyo (Japan)
Publication Date:
OSTI Identifier:
248211
Report Number(s):
CONF-9510120-
ISBN 0-87335-142-8; TRN: IM9628%%311
Resource Type:
Conference
Resource Relation:
Conference: 19. international mineral processing congress, San Francisco, CA (United States), 22-27 Oct 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the 19. international mineral processing congress: Precious metals processing and mineral waste and the environment. Volume 4; PB: 210 p.
Publisher:
Society for Mining, Metallurgy, and Exploration, Inc., Littleton, CO (United States)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; ACID MINE DRAINAGE; WASTE PROCESSING; FERRITES; MATERIALS RECOVERY; HEMATITE; ALUMINIUM SULFATES; WASTE PRODUCT UTILIZATION; IRON HYDROXIDES; WASTE PROCESSING PLANTS; FLOWSHEETS; MAGNETIC MATERIALS