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首页> 美国政府科技报告 >Size Classification of Illinois Basin Coals for Desulfurization by Froth Flotation. Final Report, July 1, 1984-June 30, 1985
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Size Classification of Illinois Basin Coals for Desulfurization by Froth Flotation. Final Report, July 1, 1984-June 30, 1985

机译：用于泡沫浮选脱硫的伊利诺伊盆地煤的粒度分类。最终报告，1984年7月1日至1985年6月30日

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Froth flotation systems are now commonly being employed in modern coal preparation plants for recovering coal fines, but are not utilized for desulfurizing coal due to a lack of system operating parameters for such applications. Previous laboratory and pilot-plant tests conducted on channel samples of high-sulfur coal have indicated that 80 to 85% of the coal with a sulfur content between 1.3 and 1.7% is recoverable by conscientious application of single stage froth flotation. Over 90% of the pyritic sulfur was consistently removed from the samples tested when the coal was ground to smaller than 100 mesh in size. This research project was conducted to determine the size grades into which the Illinois Basin high-sulfur coals should be classified for optimal generation of coarse-sized middling products to aid effective and economical desulfurization by froth flotation. Ten representative channel samples of high-sulfur coal were carefully drawn for this study from the same mines that were used for previous studies. Each sample was individually crushed to -2.5 in. in size and classified into various size grades. Desulfurization characteristics were determined for each size grade. Total sulfur was reduced to a value between 1.6 and 3.1%. The maximum reduction in total sulfur obtained in these samples ranged between 35 and 55%. Approximately 65 to 90% of the coal is recoverable with a total sulfur content of 2 to 3.5% in coarse sizes. While greater liberation of pyrite was found to occur in certain size grades, such as the 1'' x 1.5'' or 0.25'' x 14 mesh, in most of the samples tested, the liberation of pyrite increased with an increase in fineness of the coal sample. While appreciable reduction in total sulfur can be obtained by cleaning the coal in coarse sizes, about 80 or 90% of the coal may need to be ground to finer than 100 mesh for the ultimate desulfurization by froth flotation. 3 refs., 32 figs., 71 tabs. (ERA citation 10:050726)

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