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American coal-ball floras | SpringerLink

Interest in American coal-ball floras has increased perceptibly in the past few years, and some attempts have been made in this brief review to point out current lines of research and what may be expected during the next decade or two. Two other topics might have been considered, namely, a detailed comparison with the European fossils, and a stratigraphic compilation of the …

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The associated minerals make coal middlings possess a relatively high ash content.Subsequent liberation through size reduction can cause recovery increase.However,effect of comminution facilities on mineral liberation of middlings was ignored.This paper studied the liberation characteristics of middlings crushed with different kinds of fragmentation …

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Enrichment of heavy metals in coal gangue by puff balls …

Seven heavy metals were chosen to do the experiments, which showed that the puff balls have strong enrichment capacity for heavy metals(As, Pb, Mn and Ni). The highest enrichment level was Mn, 220.3 mg/kg(dry weight) for puffball fruiting bodies, and the highest As, Cr and Pb enrichment levels for puffball mycelium were 111, 265.3 and 86 mg/kg, respectively.

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Coal-ball floras of the Namurian-Westphalian of Europe ...

As a result, the coal-ball floras of the Westphalian A-B from Europe document a short span of time (less than 5 millions years). These floras correspond to the maximum domi- nance of lycopod trees with up to 96% of peat biomass (Phillips and Peppers, 1984). An interes- ting exception is the new assemblage described from Spain where ...

The Formation and Significance of Carboniferous Coal Balls

Quantitative analysis of coal-swamp vegetation from peat profiles from two sites with 12 to l5 coal-ball zones, 526 coal balls, and 31,555 cm2 surface area of peels (biomass determinations ...