摘要:
煤系高岭石是一种夹杂在浮选尾煤中含量高、粒度小的粘土类矿物,具有一定的利用价值.为了研究浮选尾煤中高岭石等矿物质的分布规律,本文以大同长焰煤、王家岭气煤和马兰焦煤的浮选分步释放各级产品为对象,基于X射线衍射K值法定量分析,探究高岭石在不同灰分下的浮选尾煤中的分布情况,并以XRD图谱的峰型特征分析各煤样中主要矿物质及精煤组分含量的变化规律.结果表明,石英、方解石在浮选过程中主要集中于粗选尾煤中,高岭石在各浮选产品中均有分布,随分选次数的增加,精煤产品中逐渐由多种矿物质变为高岭石一种矿物,在单一矿物的影响下,精煤灰分降低速率逐渐减慢.各煤样的XRD图谱中,由煤的结构单元所产生的002衍射峰在灰分最高的浮选产物中面积最小,图谱的背景最低,随着灰分的降低,002峰的面积逐渐增大,表明精煤组分在浮物中不断富集.随着分选次数的增加,高岭石的含量随灰分降低而降低,二者呈正相关关系,并符合二次函数变化规律.研究揭示了煤泥浮选过程中灰分与高岭石等矿物质含量的内在联系,这为研究浮选尾煤提取高岭石提供了量化指标.
关键词:
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浮选尾煤
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高岭石
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XRD
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定量分析
Abstract:
Coal series kaolinite is a kind of clay mineral included in flotation talings with high content and small size,which has a certain value in use.To study the distribution law of kaolinite and other minerals in flotation tailings,taking products by timed-release analysis of long-flame coal in Datong,gas coal in Wangjialing and coking coal in malan as the research object in this article,based on X-ray diffraction quantitative analysis with K value method,the distribution of kaolinite in flotation tailings at different ash content was explored,and the change law of main minerals and clean coal was analyzed based on XRD pattern..The results show that quartz and calcite are mainly enriched in flotation tailings,and kaolinite distributes in both products.With the increase of selection times,minerals weie changed into unique kaolinite.Under the influence of a single mineral,decrease rate of clean coal ash was reduced.In all XRD patterns,002 diffraction peak generated by coal structural unit is minimum in highest ash coal,background is lowest.With the decrease of ash,area of 002 diffraction peak was decreased,which shows clean coal constantly enriched in floats.Both the ash of product and the content of kaolinite were gradually decreased with the increase of selection times,presenting a positive correlation which conforms quadratic function.Research finding reveals the connection between ash and kaolinite and other minerals in the process of coal flotation.It can provide quantitative index for extraction of kaolinite from flotation tailings.
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