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Studies on characteristics and flotation of a hard-to-float high-ash fine coal

机译:难浮高灰煤粉的特征及浮选研究

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High-efficiency separation of hard-to-float high-ash fine coals has been a research hotspot in some countries, especially in China. Separation of hard-to-float high-ash fine coals by froth flotation, although considered to be the most effective, remains some challenges to be overcome. In this paper, the mineralogical/petrologic, physical and chemical characteristics of the of a hard-to-float high-ash fine coal collected in Kailuan mining area were studied. The floatability and liberation characteristics of this coal sample and potential separation processes were investigated experimentally. According to the coal characteristics, four separation processes were put forward and evaluated. Experimental results indicated that classified floatation couldn't effectively improve the fine coal quality, while the processes of fine grinding-recleaning to roughing cleaning coal and selective agglomeration-floatation were suitable for the Kailuan coal. Compared with the original coal flotation process, the processes of fine grinding-recleaning to roughing cleaning coal increased the cumulative yield from 50.87% up to 55.53% while reduced the product ash content from 11.76% down to 10.74%. In the processes of selective agglomeration-floatation, the lowest ash of clean coal is 10.69%, with 58.72% yield, 7.85% higher in yield and 1.07% lower in ash content. The ash contents of the products from the two processes are lower than 11%, which meets the clean coal requirement.
机译:难以漂浮的高灰分细煤的高效分离一直是一些国家,特别是中国的研究热点。通过泡沫浮选分离难以浮选的高灰分细煤,尽管被认为是最有效的方法,但仍需克服一些挑战。本文对开lu矿区难浮高灰粉煤的矿物学,岩石学,理化特征进行了研究。实验研究了该煤样品的漂浮性和释放特性以及潜在的分离过程。根据煤的特性,提出并评价了四个分离过程。实验结果表明,分级浮选不能有效地改善细煤质量,而开lu煤适合采用细磨-重选-粗选-清洁煤和选择性团聚-浮选工艺。与原煤浮选工艺相比,从细磨-重选到粗选的过程提高了累计收率,从50.87%提高到55.53%,产品灰分从11.76%降低到10.74%。在选择结块-浮选过程中,清洁煤的最低灰分为10.69%,产率为58.72%,产率高7.85%,灰分低1.07%。两种工艺产品的灰分均低于11%,符合清洁煤的要求。

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