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Magnesia refractories produced from chemically modified periclase grains and Mg(OH)₂ slurries

Public Domain
File Language:
English


Details

  • Personal Author:
  • Corporate Authors:
    United States. Bureau of Mines
  • Description:
    "Based on previous Bureau of Mines research indicating that improved high-temperature properties could be achieved for periclase refractories through chemical additions, the Bureau investigated the properties of full-size bricks produced from chemically modified periclase refractory grains and the suitability of making such chemical additions to mg(oh)2 slurries prior to production of the periclase grains. In full-size brick testing, strength values, both hot and cold, for the optimized bricks were superior to those for a commercial 98-wt-pct-mgo refractory. The best results were obtained for a natural magnesite with an adjusted cao:sio2 (c:s) ratio of 3.0 and a 1.0-wt-pct addition of zro2 and for a seawater periclase with an adjusted c:s ratio of 2.5 and a 0.5-wt-pct addition of mNO2. For samples produced from chemically modified mg(oh)2 slurries, additions of both mNO2 and zro2 and an increase in c:s ratios produced significant increases in hot flexural strength, similar to those resulting from chemical additions made to periclase grains. The most effective modifications were additions of mNO2 to brine- derived periclases having a c:s ratio adjusted to 3.0. These results on chemically modified magnesia refractories indicate that such material could potentially substitute for magnesia-chrome refractories containing imported chromite." - NIOSHTIC-2

    NIOSHTIC no. 10003303

  • Subjects:
  • Series:
    Mining Publications
  • Subseries:
    Report of Investigations
  • Document Type:
    Text
  • Genre:
    Report
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    14 numbered pages
  • NIOSHTIC Number:
    nn:10003303
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:78b3b0db27beaef22965d3130f641a720ebdf74e3060bfb417829b40aed55918635698426f7fa51fdcebd3d5b3046f68998b9bdab6e1b9d081b79410ed54c9ab
  • Download URL:
  • File Type:
    Filetype[PDF - 6.40 MB ]
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