旋流微泡浮选柱在临涣选煤厂分选高灰细粒煤泥的应用研究

发布时间：2018-10-23 09:14

【摘要】：机械化采煤技术及重介分选工艺的不断推广,使得浮选入料粒度偏细、灰分偏高。现如今,许多选煤厂都面临浮选系统精煤灰分超标的难题,必然也会面临重介背灰的问题,进而影响选煤厂的正常生产和经济效益。本文依托于临涣选煤厂的现场生产情况,以许疃煤样为研究对象,主要针对浮选系统的问题进行分析与研究,提出解决精煤灰分超标的改造方案。通过分析发现,现浮选系统存在的主要问题是浮选机精煤灰分超标,约在11.5%左右,而选煤厂对浮选精煤灰分的要求是10.0-11.0%,其中三、四室精煤灰分超标的现象尤其明显。通过实验室小浮选机的煤泥浮选速率实验,模拟现场浮选机的实际工作情况,从而揭示现场浮选机三、四室精煤灰分偏高的原因。本论文旨在降低浮选精煤灰分,分别对浮选系统进行了两种改造。第一种:采用二次浮选的方法,分别采用浮选机或FCMC进行二次浮选。分析现场二次浮选数据发现:该种改造方案可降低浮选精煤灰分,使用FCMC进行二次浮选的效果优于浮选机。但是,经该种方案改造后,其最终精煤灰分约11.0%左右,精煤灰分依然相对偏高。第二种:采用FCMC进行一次浮选。在实验室条件下进行了FCMC的探索性实验,证明使用FCMC可获得精煤灰分介于10.0%-11.0%的合格精煤,分选效果良好。现场FCMC一次浮选的应用结果表明:精煤灰分介于10.0%-11.0%之间,能较好的满足选煤厂对精煤灰分的要求。采用FCMC进行一次浮选,解决了浮选精煤灰分超标的难题,减轻了重介背灰的压力。本文研究结果表明:使用浮选机或FCMC二次浮选可进一步降低浮选精煤的灰分,但总精煤灰分仍然偏高;采用FCMC一次浮选即可显著改善浮选效果,降低总精煤灰分,满足选煤厂对精煤灰分的要求。
[Abstract]:With the development of mechanized coal mining technology and heavy medium separation technology, the particle size and ash content of flotation feed are smaller and higher. Nowadays, many coal preparation plants are faced with the problem that the ash content of the flotation system exceeds the standard, and will inevitably face the problem of heavy medium back ash, which will affect the normal production and economic benefit of the coal preparation plant. Based on the field production situation of Linhuan Coal preparation Plant, this paper takes Xutuan coal sample as the research object, mainly analyzes and studies the problems of flotation system, and puts forward a reform scheme to solve the problem of ash content exceeding the standard of clean coal. Through analysis, it is found that the main problem of flotation system is that the ash content of flotation machine is over the standard, about 11.5%, and the requirement of coal preparation plant is 10.0-11.0, especially the phenomenon that the ash content of three and four rooms of clean coal exceeds the standard. Through the experiment of coal slime flotation rate of small flotation machine in laboratory, the actual working condition of field flotation machine is simulated, and the reason of high ash content of clean coal in three and four rooms of field flotation machine is revealed. The aim of this paper is to reduce ash content of floatation coal. Two kinds of revamping of flotation system have been carried out respectively. The first one is secondary flotation with flotation machine or FCMC. By analyzing the data of secondary flotation on site, it is found that the modified scheme can reduce ash content of flotation concentrate coal, and the effect of secondary flotation with FCMC is better than that of flotation machine. However, the final ash content of the refined coal is about 11.0%, and the ash content of the clean coal is still relatively high. The second kind: FCMC is used to carry on the primary flotation. The exploratory experiment of FCMC was carried out in the laboratory. It was proved that the clean coal with ash content of 10.0% -11.0% could be obtained by using FCMC, and the separation effect was good. The application results of FCMC primary flotation show that the ash content of clean coal is between 10.0- 11.0%, which can meet the requirements of coal preparation plant for clean coal ash. The problem of ash content exceeding the standard was solved by using FCMC, and the pressure of heavy medium back ash was reduced. The results show that the ash content of concentrate coal can be further reduced by using flotation machine or FCMC secondary flotation, but the ash content of total clean coal is still high, and the effect of flotation can be improved and the ash content of total clean coal can be reduced by using FCMC primary flotation. Meet the ash requirements of coal preparation plant.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94

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