大柳塔选煤厂入选原煤硫分分布规律研究  

Study on sulfur distribution of raw coal in Daliuta Coal Preparation Plant

作　　者：王伟 WANG Wei(Shendong Coal Group,Yulin 719315,China)

机构地区：[1]神东煤炭集团公司,陕西榆林719315

出　　处：《洁净煤技术》2020年第6期83-88,共6页Clean Coal Technology

基　　金：国家科技支撑计划资助项目(2014BAB01B04)。

摘　　要：随着长期高强度的开发与开采深度的增加,神东矿区选煤厂入选原煤质量逐渐恶化,商品煤硫分逐渐升高。基于此选取神东矿区代表性原煤为研究对象,采用筛分、浮沉、扫描电镜综合分析了原煤全硫及形态硫的粒度分布、密度分布规律以及含硫矿物嵌布结构,提出了选煤厂进一步完善生产工艺的建议。结果表明:神东矿区入选原煤中矸石较脆,在采矿过程中更多向细颗粒富集,造成原煤中细颗粒灰分和硫分较高,<0.5 mm部分灰分较其他粒级升高了5个百分点以上,硫分含量也达到0.7%以上;>13 mm粒级的块原煤占比达到52.13%,灰分低于其他粒级而硫分明显升高;整体而言,随着浮沉密度的增大,原煤全硫含量先缓慢增加,超过1.6 g/cm^3后,迅速增加;浮沉密度一致时,粗颗粒全硫整体高于细粒级,而>1.8 g/cm^3时,粗颗粒硫分低于细粒级,说明随着原煤粒度降低,含硫矿物的解离程度逐渐增高,无机矿物向高密度物料集中;神东矿区原煤硫分主要为黄铁矿硫,占比超过60%,其次是有机硫,且在低密度中硫分以有机硫为主,高密度级中硫分以黄铁矿硫为主,黄铁矿硫主要呈细脉状、粒状分布,嵌布粒度0.1 mm左右。在后续生产中,选煤厂应结合实际情况,进一步降低入选上限,实现原煤中含硫矿物的充分解离,同时积极研发针对微细入料脱硫的选择性脱除技术如磁选、微细分级脱泥技术,同时加强在线硫分含量的技术检测,保障商品煤质量。With the long-term high-intensity development and the increase of mining depth,the quality of raw coal of Shendong mining area deteriorates gradually,and the sulfur content of commercial coal also increases gradually.Based on the above,the representative raw coal of Shendong mining area was selected as the research object.The grain size distribution,density distribution rule and the embedded structure of sulfur-bearing minerals of the raw coal,including total sulfur and morphological sulfur were comprehensively analyzed by screening,floating and sinking,and scanning electron microscope.The suggestions for the coal preparation plant to further improve the production process were put forward.The main conclusions are as follows.The results show that the gangue in the selected raw coal of Shendong mining area is brittle,and more fine particles are enriched in the mining process,resulting in a higher ash and sulfur content of fine particles in the raw coal.The ash content of<0.5 mm partial fraction is more than 5 percentage points higher than other grain levels,and the sulfur content also reaches more than 0.7%.Lump coal of>13 mm grain size accountes for 52.13%,the ash content is lower than other grain size and the sulfur content increases significantly.On the whole,with the increase of floating and settling density,the total sulfur content of raw coal increases slowly at first,and then increases rapidly after exceeding 1.6 g/cm^3.When the floating and settling density is consistent,the total sulfur content of coarse particles is higher than that of fine particles on the whole.While the sulfur content of coarse particles in the range of>1.8 g/cm^3 is lower than that of fine particles,indicating that with the decrease of raw coal particle size,the degree of dissociation of sulfur-bearing minerals gradually increases,and the inorganic minerals concentrate to high-density materials.The sulfur content of raw coal in Shendong mining area is mainly pyrite sulfur,accounting for more than 60%,followed by organic sulfur.In low

关 键 词：筛分试验 浮沉试验 硫分分析 硫分赋存 

分 类 号：TD94[矿业工程—选矿]