SYMPOSIA PAPER Published: 01 January 1978
STP35765S

Correlation of Weathered Lignite with pH and Depth of Cover

Source

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.

Author Information

Ginnard, KJ
Paul Weir Company, Chicago, Ill.
Corriveau, MP
Paul Weir Company, Chicago, Ill.
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Details
Developed by Committee: D05
Pages: 41–49
DOI: 10.1520/STP35765S
ISBN-EB: 978-0-8031-4730-0
ISBN-13: 978-0-8031-0349-8