Fusibility of ash from Northern Great Plains lignites was correlated with the oxide constituents in a 10-component analysis. The correlations developed establish methods and guidelines for predicting the fusibility of ash in these coals and adjusting it for boiler fuel use or other conversion processes.nCompared to ash from bituminous coals, lignite ash has higher propotions of Ca, Mg, S, and Na. Indices useful for prefdicting ash-softening temperature of bituminous coals are not satisfactory for lignites. The need for improved indices for lighites was a principal justigication of this study.nCorrelations for lignite were developed using statistical regression on analyses of 680 samples of ash. Correlations were developed on different subordinate sets mf data, for ash from naturally occurring lignite, and for ash from lignite modified by ion exchange or direct mineral addition.
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