STP661

    Correlation of Weathered Lignite with pH and Depth of Cover

    Published: Jan 1978


      Format Pages Price  
    PDF Version (128K) 9 $25   ADD TO CART
    Complete Source PDF (1.2M) 9 $55   ADD TO CART


    Abstract

    Using the well known relationship of lowered pH with increased oxidation of lignite slurries, a rapid field technique was established correlating the pH of a sample lignite slurry and its depth of cover to the degree of oxidation (or weathering).

    Four relationships were confirmed: (a) calorific content decreases with increased oxygen content, (b) increasing cover corresponds to decreasing oxygen content, (c) megajoule (Btu) content increases with depth of cover, and (d) megajoule (Btu) content increases with corresponding increase in pH of lignite slurry.

    Using this technique and the relationships derived therefrom, a field geologist can quickly estimate as a first order approximation from the depth of coal times pH product whether or not a sample lignite is unacceptably weathered.

    Keywords:

    coal, lignite, weathering, pH, oxidation, field


    Author Information:

    Ginnard, KJ
    Project geologist and vice president, Paul Weir Company, Chicago, Ill.

    Corriveau, MP
    Project geologist and vice president, Paul Weir Company, Chicago, Ill.


    Paper ID: STP35765S

    Committee/Subcommittee: D05.28

    DOI: 10.1520/STP35765S


    CrossRef ASTM International is a member of CrossRef.