Report of Investigations 7771: Large-Scale Continuous Attrition Grinding of Coarse Kaolin

Details

• Personal Author:
  Collins, Edwin W. ; Davis, Edward G. ; Feld, Ignatz L.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  Large-scale ultrafine grinding tests of a coarse kaolin were made using the Bureau of Mines-developed attrition grinding process in continuous open- and closed-circuit systems. A 20-inch-diameter attrition grinder, designed and constructed at the Tuscaloosa Laboratory, was used. Studies included single- and multiple-stage open-circuit grinding, and also continuous grinding tests in closed-circuit with a 6-inch-diameter solid bowl centrifuge. Clay feed, containing 9.0 percent minus-2 micrometer ESD, was used at rates up to 840 pounds per hour. Multistage grinding tests gave better results than single-stage treatment when equivalent clay feed rates were used. Closed-circuit grinding tests yielded ground products containing slightly more minus-2-micrometer-ESD clay than the open-circuit grinding when using the same clay feed. Energy consumption was lower in closed-circuit grinding than in batch or open-circuit grinding. A modified two-stage closed-circuit grinding system gave the best grade of product and amount of minus-2-micrometer-ESD clay produced per pound of clay feed. The ground product from this test contained 88.5 percent minus-2-micrometer-ESD material and electrical energy consumption was 327 kilowatt-hours per ton of minus-2-micrometer-ESD material produced. Work done in cooperation with the University of Alabama. [Description provided by NIOSH]
• Subjects:
  Minerals Mining Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552 (print)
• Publisher:
  United States. Bureau of Mines
• Document Type:
  Text
• Genre:
  Case Report
• Place as Subject:
  Alabama ; OSHA Region 4
• Rights:
  Public Domain
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TURC - Tuscaloosa Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  28 pdf pages
• NIOSHTIC Number:
  nn:10009023
• NTIS Accession Number:
  PB-223935
• Citation:
  Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 7771, 1973 Aug; :1-22
• Federal Fiscal Year:
  1973
• Performing Organization:
  University of Alabama
• Peer Reviewed:
  False
• Source Full Name:
  Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 7771
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:384deebaa4c419051254efb00fad0c7b09f7fc803d72d8a959e952061f830d7cff983936d4cd7e6f915034309896d45b984f13865437d3deeb2d5028ac3b6fb9
• Download URL:
  https://stacks.cdc.gov/view/cdc/201956/cdc_201956_DS1.pdf
• File Type:
  [PDF - 1.38 MB ]