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Author (up) Mitchell, P.; Rybock, J.; Wheaton, A. openurl 
  Title Treatment and prevention of ARID using silica micro encapsulation Type Book Chapter
  Year 1999 Publication Proceedings of the 16th annual National meeting of the American Society for Surface Mining and Reclamation; Mining and reclamation for the next millennium Abbreviated Journal  
  Volume Issue Pages 657-661  
  Keywords acid mine drainage Bunker Hill Mine Idaho mines pollution Shoshone County Idaho United States water treatment 22, Environmental geology  
  Abstract In response to the known drawbacks of liming and the ever-increasing regulatory demands on the mining industry, KEECO has developed a silica micro encapsulation (SME) process. SME is a cost-effective, high performance reagent that is utilized in conjunction with simple chemical delivery systems. By encapsulating metals in a silica matrix formation and rapidly precipitating them into a sand-like sludge, it offers all the advantages of liming without the negative drawbacks. Utilizing an injection technique via a high shear mixing device, a slurry from of the SME product called KB-1 (super TM) was applied to ARD at the Bunker Hill Mine in Idaho and to ARD pumped from collection ponds at a remote mine site in the Sierra Nevada Mountains. Flow rates at both sites ranged from 500 to 800 gallons per minute. Treated water from the Bunker Hill Mine operation achieved the site's NPDES criteria for all evaluated metals and U.S. Drinking Water quality for arsenic, cadmium, chromium, lead and zinc with a dosage rate of 1.34 grams KB-1 (super TM) per liter. Treated water from the Sierra Nevada project focused on the control of aluminum, arsenic, copper, iron and nickel. All water samples displayed a >99.5% reduction in these metals, as well as an 84%-87% reduction in the concentration of sulfate. Testing on sludge generated from both operations achieved TCLP Action Limits. The SME process is currently under evaluation as a means to coat the pyrite surfaces of newly generated mine tailings to prevent oxidation and future acid generation.  
  Corporate Author Thesis  
  Publisher Place of Publication 16 Editor Bengson, S.A.; Bland, D.M.  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Treatment and prevention of ARID using silica micro encapsulation; GeoRef; English; 2001-047986; 16th annual National meeting of the American Society for Surface Mining and Reclamation, Scottsdale, AZ, United States, Aug. 13-19, 1999 2 tables Approved no  
  Call Number CBU @ c.wolke @ 16602 Serial 297  
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