摘要
以贵州大河边矿煤为研究对象,确定了其在显微光学条件下煤岩显微组分的组成、赋存状态及含量特征,同时采用XRD衍射技术分析了原煤中矿物组成。通过对原煤的破碎解离,进而研究了壳质组、镜质组和惰质组在不同粒级的解离规律,在此基础上使用密度梯度离心的方法研究了显微组分的分选,并验证了超声辅助对分选效果的影响。结果表明:原煤中壳质组分布方式主要以片状、细脉状形式存在,与镜质组紧密连生,轮廓清晰;镜质组主要以团块状形式出现,具有明显内生裂纹;惰质组主要包括丝质体和半丝质体2大类,半丝质体单体粒度较小,部分具有鳞片状结构,丝质体细胞结构保存十分完好。各粒级显微组分单体解离度随着破碎程度的加深逐渐增大,其中破碎对镜质组和惰质组的解离效果更加明显,3种显微组分最佳解离粒度为0.125~0.074 mm。壳质组、镜质组和惰质组的最佳分选密度分别为-1.15,1.27~1.29,1.33~1.35 g·cm-3,超声辅助有利于提高壳质组的分选效果。
With coal from Dahebian coal mine taken as study object,the composition,distribution ccurence and content of macerals were determined under microscopic condition.At the same time,the mineral composition of raw coal was studied by XRD diffraction technique.Furthermore,the dissociation law of the exinite,vitrinite and incrtinite under different crushing size were analyzed by breaking and dissociating the raw coal.Based on this,the separation of macerals were studied by density gradient centrifugation,and the sorting effect after ultrasound assisted was verified.The results showed that the exinite in the raw coal mainly exists in the form of flakes and fine veins,which is closely associated with the vitrinite,and there is a clear boundary line between them;the vitrinite mainly appears in the form of agglomerates,with obvious endogenous cracks;the incrtinite mainly consists of two major categories of fusinite and semifusinite,in which the fusinite has a small particle size and part of them have a scaly structure,and the cell structure of semifusinite is completely preserved.The free fraction degree of each maceral increases with the degree of fragmentation increases,and the dissociation effect of the fragmentation on the vitrinite and the incrtinite is more obvious.The optimal dissociation particle size of three macerals is 0.125~0.074 mm.The optimal separation densities of the exinite,thevitrinite and the incrtinite is-1.15,1.27~1.29 g·cm-3,and 1.33~1.35 g·cm-3,respectively.The assistance of ultrasound is beneficial to improving the sorting effect of the exinite.
作者
杜美利
杨敏
杨瑞
朱晨浩
朱超
任辉
DU Mei-li;YANG Min;YANG Rui;ZHU Chen-hao;ZHU Chao;REN Hui(College of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Land and Resources,Xi’an 710054,China;Shaanxi Coalfield Geological Testing Co.,Ltd.,Xi’an 710054,China)
出处
《西安科技大学学报》
CAS
北大核心
2019年第6期950-956,共7页
Journal of Xi’an University of Science and Technology
基金
国家自然基金(4167020886).
关键词
矿物加工工程
显微组分
密度梯度离心
解离规律
分选
mineral process engineering
macerals
density gradient centrifugation
dissociation law
sorting
