基于XRD分析高岭石在浮选尾煤中分布规律

发布时间：2018-03-23 08:12

本文选题：浮选尾煤　切入点：高岭石　出处：《矿产综合利用》2017年02期 　论文类型：期刊论文

【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。
[Abstract]:Coal measures kaolinite is a kind of clay mineral with high content and small particle size in flotation tailings. In order to study the distribution of kaolinite and other minerals in flotation tail coal, this paper deals with the distribution of kaolinite and other minerals in flotation tail coal. Based on quantitative analysis of X-ray diffraction K value method, the distribution of kaolinite in flotation tailings with different ash content was studied. The changes of the main minerals and the components of the concentrate coal in each coal sample were analyzed by the peak type characteristic of XRD. The results showed that quartz and calcite were mainly concentrated in the coarse coal during the flotation process, and kaolinite was distributed in all flotation products. With the increase of separation times, the concentrate coal product gradually changed from a variety of minerals to a kaolinite mineral. Under the influence of a single mineral, the ash content decreased gradually. In the XRD diagram of each coal sample, The diffraction peak of 002 produced by the structural unit of coal is the smallest in the floatation product with the highest ash content, the background of the spectrum is the lowest, and the area of the peak 002 increases with the decrease of ash content. The results show that the components of clean coal are continuously enriched in the floatation, and the content of kaolinite decreases with the decrease of ash content with the increase of separation times, and there is a positive correlation between the content of kaolinite and the concentration of kaolinite. The relationship between ash content and kaolinite content in the process of coal slime flotation is revealed, which provides a quantitative index for studying the extraction of kaolinite from tailings of coal floatation.
【作者单位】：太原理工大学矿业工程学院;
【基金】：山西省自然科学基金项目(2016011056) 山西省社发攻关项目(20130313001-2)
【分类号】：TD94;TD923

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