高浓度煤泥水的强化矿化柱浮选研究

发布时间：2018-10-19 19:47

【摘要】：旋流微泡浮选柱(FCMC)在处理细粒含量较多的煤泥时,有着明显的优势。但由于重介选煤技术的发展和采煤机械化程度的提高,导致浮选系统煤泥含量增大,加之重介选煤用水量少于跳汰选煤用水量,使得入浮浓度升高,在某些工艺参数限制的条件下,FCMC分选高浓度细粒煤泥水时难以获取低灰精煤产品。本论文旨在解决高浓度细粒煤泥水的浮选降灰难题,设计了一种新型预浮选式浮选柱(NPFC)。NPFC入料在进料过程中发生管流矿化,进入一段柱体预浮选,一段尾矿进入二段柱体分选。首先,采用FCMC对不同浓度煤泥水进行浮选试验研究,得到较优的柱体高度1800mm和FCMC难以处理的矿浆浓度120g/L,作为NPFC的初期分选条件。其次,对NPFC进行了新结构参数和操作参数试验,通过多因素逐项试验方法,确定了较适宜的参数水平。最后,进行了不同浓度两组入料矿化压力下的矿浆浮选试验,并对两种浮选柱的分选结果做对比分析。研究结果表明:FCMC和NPFC浮选精煤灰分随着浓度的升高而升高,浓度过高会使分选效果恶化。在NPFC下,调节入料矿化压力能调整入料矿化强度,调节一段柱体结构能优化一段柱体内部流场,改变一段柱体分选空间大小和二段柱体的分选稳定程度,从而获得较低灰精煤。当矿浆浓度为120g/L时,FCMC精煤灰分为11.22%,远超精煤灰分9.50%;入料矿化压力为0.05MPa时,NPFC精煤灰分为10.73%,比FCMC精煤灰分低0.49%;当入料矿化压力为0.07MPa时,NPFC精煤灰分为9.32%,比FCMC精煤灰分低1.90%。当浓度继续升高时,NPFC精煤灰分升高,但依旧低于FCMC矿浆浓度为120g/L的精煤灰分。各浓度条件下,NPFC精煤灰分低于FCMC的精煤灰分,精煤产率和浮选完善指标也相应降低。通过调节入料矿化压力可以调节产品指标。通过论文的研究得出结论:NPFC比FCMC更能保证高浓度细粒煤泥水分选的精煤灰分。
[Abstract]:The swirl microbubble flotation column (FCMC) has obvious advantages in the treatment of coal slime with more fine particles. However, due to the development of heavy medium coal preparation technology and the improvement of coal mining mechanization degree, the coal slime content of flotation system increases, and the water consumption of heavy medium coal preparation is less than that of jig coal preparation, which makes the floating concentration increase. Under the condition of some technological parameters, it is difficult to obtain low ash concentrate coal product when FCMC is used to separate high concentration fine coal slime water. The purpose of this paper is to solve the problem of ash reduction in flotation of high concentration fine coal slime water. A new type of pre-floatation column (NPFC). NPFC has been designed to mineralize in the process of feeding, into the first stage of column pre-flotation, and the first stage of tailings into the second stage of column separation. Firstly, the flotation experiments of coal slurry with different concentrations were carried out by using FCMC. The optimum concentration of 1800mm and FCMC slurry, which was difficult to deal with, was obtained as the initial separation condition of NPFC. Secondly, the new structure parameters and operation parameters of NPFC are tested, and the more suitable parameter level is determined by the method of multi-factor item-by-item test. Finally, the pulp flotation experiments were carried out under two groups of feed mineralization pressure with different concentrations, and the separation results of the two flotation columns were compared and analyzed. The results show that the ash content of FCMC and NPFC flotation concentrate increases with the increase of concentration, and the separation effect will deteriorate if the concentration is too high. Under NPFC, adjusting the mineralization pressure can adjust the mineralization intensity, adjust the structure of the first section of the column can optimize the flow field of the first section of the column, change the size of the separation space of the first section of the column and the stability degree of the separation of the second stage of the column, so as to obtain lower ash concentrate coal. When the pulp concentration is 120g/L, the FCMC coal ash is divided into 11.2222, which is much higher than the refined coal ash 9.50; when the feed mineralization pressure is 0.05MPa, the NPFC concentrate coal ash is 10.73 and 0.49 lower than the FCMC concentrate ash, and when the 0.07MPa is 0.07MPa, the NPFC clean coal ash is 9.32, which is 1.90 lower than the FCMC refined coal ash. When the concentration continues to increase, the ash content of NPFC concentrate coal increases, but it is still lower than that of FCMC pulp with 120g/L concentration. The ash content of NPFC coal is lower than that of FCMC, and the yield of clean coal and the improvement index of flotation are also decreased. The product index can be adjusted by adjusting the mineralization pressure. The conclusion of this paper is that NPFC can guarantee the ash content of fine coal slurry separation with high concentration more than FCMC.
【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;TD923

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