Uranium is frequently enriched by sorption or chemical combination in shales, lignites and phosphorites.
铀经常为页岩，泥炭和磷块岩所吸附或化学结合态而富集。
Uranium, germanium-bearing coals are mainly lignites of low grade incoalation and belong to semidurain, semiclarain.
含铀、锗煤主要为煤化程度低的褐煤，属于半暗-半亮、暗-亮煤及亮-暗煤。
In the reburning zone using lignites as reburning fuels, the heterogeneous mechanisms may be an important contributor to NO reduction.
褐煤作为再燃燃料时，煤焦的异相还原机理对NO还原起重要作用。
In the reburning zone using lignites as reburning fuels, the heterogeneous mechanisms may be an important contributor to NO reduction.
褐煤作为再燃燃料时，煤焦的异相还原机理对NO还原起重要作用。
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