Economic evaluation of the ash of run-of-mine coking coals from the Karaganda coalfield. [Price penalty for high ash coal]

Journal Article · Thu Jan 01 04:00:00 EST 1981 · Coke Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6684149

Yurkina, L P; Sheveleva, R N; Kurbatov, V P; Korkina, T B

Economically justified reductions in price must be established for coals which exceed the average levels of ash. The reduction must compensate for the extra cleaning costs involved; this is a general principle in the approach to the economic evaluation of product quality. The reduction in price should be determined by the relative loss incurred by the consumer in accepting higher-ash coal. The basis for the economic evaluation of ash fluctuations should be the effects on washery output and cleaning costs of accepting coals with differing initial ash contents. Our investigations into the relationships between the quality, quantity, and cost indices of the cleaning process for Karaganada coals of different ash levels have shown that the most reliable procedures for economic evaluation are given for the various coal preparation plants. In calculating the over-all costs, the variations in run-of-mine coal consumption for the production of unit weight of final product should be measured by the variances in the yield of concentrate at a constant ash, rather than all washery products. The adoption of these procedures has shown that for each extra 1% of ash in the run-of-mine coals, brought about by an increase in the proportion of dirt they carry, the price reduction should be 2.5%, rather than 4.82% as proposed in the article under discussion.

• OSTI ID: 6684149
• Journal Information: Coke Chem. USSR (Engl. Transl.); (United States), Journal Name: Coke Chem. USSR (Engl. Transl.); (United States) Vol. 8; ISSN COKCA
• Country of Publication: United States
• Language: English

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