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A comparison of the results obtained from grinding in a stirred media mill lignite coal samples treated with microwave and untreated samples;

机译：在搅拌介质研磨机中将经过微波处理的褐煤样品与未经处理的样品磨碎所得结果进行比较；

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Various studies have been carried out on the effect of microwave-treatment on grinding different types of coal. However, the effect of microwave treatment on grinding coal samples -3.35 mm in size which can be considered to be fine is still under investigation. The purpose of this paper is to make contributions to these studies conducted. In the study, lignite coal samples with pyritic sulphur and 25% structural moisture were crushed below -3.35 mm particle size using jaw and cone crushers and then classified into three different mono size groups by Russel sieve. For a complete removal of the structural moisture from the lignite coal, a microwave application with 600 W needs approximately 35% more energy consumption than that with 850 W. The untreated coal samples and the ones treated with microwave at 850 W were ground for 5,15,30,60,120 s in a stirred media mill. The breakage rates of microwave-treated coal increased and accordingly the ground products of microwave-treated coal yielded finer particles than -106 μm as compared to untreated coals. The untreated and microwave-treated feed coals of -3350 μm and -1180 μm particle sizes were ground for 2 min in the stirred media mill. It was found that the increases in the rate of weight percentages for -106 μm particle size fraction after 2 min of grinding of untreated and microwave-treated feed coals of-3350 um and -1180 μm were found to be 15.81% and 2.69%, respectively. Moreover, Hardgrove Index (HGI) test results of lignite coal showed that the HGI index value increased by approximately 23% after microwave treatment with 850 W.
机译：关于微波处理对研磨不同类型的煤的影响，已经进行了各种研究。然而，仍在研究微波处理对-3.35 mm大小的磨煤样品的影响，这可以认为是很好的。本文的目的是为进行的这些研究做出贡献。在这项研究中，使用颚式破碎机和圆锥破碎机将具有黄铁矿硫和25％结构水分的褐煤样品破碎到-3.35 mm粒度以下，然后通过Russel筛分为三个不同的单一粒度组。为了完全去除褐煤中的结构水分，使用600 W的微波比使用850 W的能耗要多消耗约35％的能量。将未经处理的煤样品和经过850 W的微波处理的煤样品磨碎5个，在搅拌式介质磨机中进行15、30、60、120秒的处理。微波处理的煤的破碎率增加，因此与未处理的煤相比，微波处理的煤的研磨产物产生的颗粒比-106μm细。将-3350μm和-1180μm粒径的未经处理和经微波处理的进料煤在搅拌介质磨中研磨2分钟。发现在研磨未处理和微波处理过的原料煤（分别为-3350 um和-1180μm）2分钟后，对于-106μm粒度级分的重量百分比增加率为15.81％和2.69％，分别。此外，褐煤的哈德格罗夫指数（HGI）测试结果表明，经850 W微波处理后，HGI指数值增加了约23％。

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