摘要
超纯煤制备是煤炭高价值利用的基础。海石湾煤-1.4g/cm^(3)浮煤灰分低,产率大,具备制备超纯煤的物质条件。通过对灰分低于3%的低灰煤进行X射线衍射(XRD)及显微分析,研究低灰煤中的杂质矿物组成及赋存形态。在此基础上进行磨矿方式选择试验和磨矿时间、级配及分散剂等磨矿条件试验。试验发现:在同等条件下,湿法磨矿效果优于干法磨矿;当磨矿介质粒径组成越小、磨矿时间越长时,磨矿效果越好;添加0.55%六偏磷酸钠作分散剂,磨矿级配质量比取∅30mm∶∅25mm∶∅20mm∶∅15mm=39.11%∶23.57%∶18.82%∶18.50%,湿磨4h时,煤粒与无机杂质矿物已基本解离。在此条件下进行浮选试验,浮选精煤产率为19.08%,灰分为0.88%。
The preparation of ultra-pure coal is the foundation for high value-added processing,conversion and utilization of coal. With the low ash content and high yield,the-1. 4 g/cm^(3) Haishiwan floating coal has the material conditions for the ultrapure coal preparation. The composition and occurrence form of impurity minerals in low ash coal are studied by X-ray diffraction( XRD) and microscopic analysis for low ash coal with ash content less than 3%. On this basis,grinding experiments are carried out under to select the grinding method,grinding time,gradation and dispersing agent. The results show that wet grinding is better than dry grinding under the same conditions. The grinding effect is better when the particle size of grinding medium is smaller and the grinding time is longer. With the addition of 0. 55% sodium hexametaphosphate as dispersant,the grading( mass ratio) is39. 11% ∅30 mm particles,23. 57% ∅25 mm particles,18. 82% ∅20 mm particles,and 18. 50% ∅15 mm particles,the coal particles are basically dissociated from the inorganic impurities after 4 hours of wet grinding. And flotation results of the grinded coal show that,the clean coal yield is 19. 08% with an ash content of 0. 88%.
作者
王枭
颜冬青
高少鹏
王进
赵世永
WANG Xiao;YAN Dong-qing;GAO Shao-peng;WANG Jin;ZHAO Shi-yong(College of Chemistry and Chemical Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Shaanxi Coal-chemical Coal Preparation Technology Co.,Ltd.,Xi'an 710100,China)
出处
《煤炭工程》
北大核心
2021年第4期158-161,共4页
Coal Engineering
基金
陕西省自然科学基础研究计划联合基金项目(2019JLM-12)
陕西省教育厅科研计划资助项目(16JF018)。
关键词
超纯煤
磨矿方式
磨矿时间
级配
分散剂
ultra-pure coal
grinding method
grinding time
gradation
dispersant
