基于多元化应用的煤矸石高效破碎分选技术研究

发布时间：2018-07-05 03:11

  本文选题：煤矸石 + 破碎分选　； 参考：《武汉理工大学》2015年硕士论文

【摘要】：本文以解决不同利用途径对煤矸石品质要求各异的矛盾为目的,针对中煤华昱公司煤矸石循环利用过程中存在的一些问题,在充分研究煤矸石特性的基础上,开展煤矸石高效破碎分选技术的研究,并据此提出合理的煤矸石破碎分选工艺方案,为煤矸石低成本、分层次、高效利用提供全面可靠的技术支撑。煤矸石是由硬度不同、发热量各异的岩石组成的混合物,经实例证明,不同工艺破碎煤矸石均存在热值随粒度减小而增大的现象,且破碎后煤矸石所含不同矿物在不同粒级中富集,可通过选择性破碎及合理的筛分分级,对煤矸石进行热值及矿物分选。以粒度与热值分布为评价手段,对比颚式破碎机、对辊式破碎机、锤式破碎机、反击式破碎机等不同类型破碎机破碎煤矸石的效果,并结合目前砂石料生产中的单段锤式破碎机、细碎机、冲击式破碎机等设备进行工业中试,在此基础上设计出冲击力可调、具有特殊破碎腔结构的新型煤矸石选择性破碎机。华昱煤矸石经其破碎后,2.36mm以下细粒级煤矸石发热量比原状煤矸石提高45%以上,且有效减少了煤矸石中低热值部分的过粉碎,分选出的4.75mm以上低热值华昱煤矸石满足国家Ⅲ级碎石相关标准,可以用作集料制备一定强度等级的混凝土。分析了华昱公司矸石电厂、烧结砖厂、水泥厂存在的问题,并结合洗煤厂矸石的诸多特点,设计出的煤矸石破碎分选工艺方案采用三级破碎、四级筛分工艺,煤矸石经破碎分选后,6mm以下高热值部分作电厂入炉燃料;6~8mm、4.75~8mm中热值部分用作砖厂原料;8~20mm、20mm以上低热值部分用作混凝土集料备用。经计算,华昱公司新建年处理100万吨煤矸石破碎分选生产线,每年共产生经济效益约330万元,3年左右即可收回生产线建设投资(1033万元),经济效益显著。
[Abstract]:In order to solve the contradiction of different utilization ways to the different quality requirements of coal gangue, aiming at some problems existing in the process of recycling utilization of coal gangue in Huayu Coal Company, and on the basis of fully studying the characteristics of coal gangue, this paper aims at solving the contradiction of different utilization ways to the quality of coal gangue. The research on high efficiency crushing and sorting technology of coal gangue is carried out, and a reasonable scheme of coal gangue crushing and sorting technology is put forward, which provides a comprehensive and reliable technical support for the low cost, hierarchical and efficient utilization of coal gangue. Coal gangue is a mixture of rocks with different hardness and different calorific value. It has been proved by examples that the calorific value increases with the decrease of particle size. The different minerals contained in the coal gangue after crushing are enriched in different grain-grade, so the calorific value and mineral separation of the coal gangue can be carried out by selective crushing and reasonable screening and classification. Based on the distribution of granularity and calorific value, the effects of jaw crusher, roller crusher, hammer crusher and counter crusher on crushing coal gangue are compared. Combined with single stage hammer crusher, fine crusher, impact crusher and so on, a new type of coal gangue selective crusher with adjustable impact force and special crushing cavity structure was designed. The calorific value of the fine grained gangue below 2.36mm is more than 45% higher than that of the undisturbed gangue, and the over-crushing of the low-calorific value part of the gangue is effectively reduced. The low calorific value Huayu coal gangue above 4.75mm can be used as aggregates to prepare concrete with a certain strength grade because it meets the national grade 鈪，

本文编号：2098665