浮选精煤中杂质矿物含量变化规律研究.docxVIP

浮选精煤中杂质矿物含量变化规律研究郭明明，董宪姝，乌鹏飞 （太原理工大学矿业工程学院，山西 太原 030024）摘 要：为研究煤泥浮选时精煤中杂质矿物含量在不同粒度随浮选时间的变化规律，本文选取平朔3#弱粘煤（?0.5mm）作为试样，用X射线荧光光谱分析煤样中主要氧化物质为Al2O3、SiO2及CaCO3，用X射线衍射仪对各粒级入料煤样及精煤中不同浮选时间的4种产品的杂质矿物分别进行了定性及RIR定量分析，并根据烧灰前后发生的化学变化及质量守恒定律计算烧灰前矿物实际含量。结果表明：平朔3#弱粘煤（?0.5mm）煤样中矿物质主要由高岭石、方解石及石英3种组成，其中0.125～0.074mm、0.250～0.125mm、0.500～0.250mm粒度级中高岭石含量均在70%以上，且该煤样中高岭石含量随粒度的增大而增加，石英、方解石含量则随粒度的增大而减少。在有效浮选3分钟内，随着浮选时间增加，粒度级为0.500～0.250mm、0.250～0.125mm时矿物质含量变化规律相似，即高岭石、方解石的含量均为先减小后增大，石英含量则先增大后减小。粒度级为0.125～0.074mm、?0.074mm时，高岭石含量先增大后减小，石英、方解石含量则没有明显变化规律。 关键词：浮选试验；杂质矿物；粒级；XRF；XRD中图分类号：TD925 文献标识码：A Study on change rule of entrainment of mineral content in clean coal with the flotation time GUO Ming-ming, DONG Xian-shu,WU Peng-fei(College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China)Abstract: In this paper, the authors use the Pingshuo3# weakly caking coal(?0.5 mm) as experimental coal sample, which study the change rule of minerals content from clean coal with the flotation accumulation time under the condition of different flotation particles. The analysis of XRF indicats main oxides in coal consists of Al2O3, SiO2 and CaCO3. The qualitative and quantitative analysis on minerals in the coal sample of grain sizes and all clean coals from flotation speed test were done with XRD .The results show that the main minerals in the coal samples of grain sizes are kaolinite, calcite and quartz and the content of kaolinite raised with the increase of particle size, however, the content of quartz and calcite lessened with the increase of particle size. The contents of kaolinite have the similar change rule that they raised and then lessened with the flotation time when the grain sizes were 0.500～0.250mm and 0.125～0.074mm,however, the content of kaolinite lessened and then raised with the flotation time when the grain sizes were 0.250～0.125mm and ?0.074mm..Key words: flotation experiment ; entrainment of mineral; grain sizes; XRF; XRD煤炭在我国的一次能源结构中约占70%[1]，随着机械化开采程度的提高，入