Experimental Study on Deashing of High Ash and Refractory Coal Slime by Classification Flotation
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摘要:
针对贵州某煤泥中-0.074 mm粒级的产率为54.19%，灰分为40.55%，并含有大量的珍珠陶土、高岭石和二重高岭石等黏土矿物，极易泥化的高灰难选煤泥。采用分级浮选方式，分别确认了-0.5+0.25 mm、-0.25+0.074 mm、-0.074 mm粒级浮选的矿浆浓度、捕收剂用量、起泡剂用量、叶轮转速及工艺流程等较优浮选条件并和-0.5 mm全粒级进行对比；结果表明：各粒级的较优药剂用量和工艺参数均不同，在较优浮选条件下，分粒级的精煤产率高于全粒级，灰分低于全粒级；分粒级的尾煤产率低于全粒级，灰分高于全粒级，即分粒级浮选对该煤泥有显著的意义。
Abstract:Aiming at a certain coal slime in Guizhou, the yield rate of -0.074mm class is 54.19%, the ash content is 40.55%, the yield rate of -0.045 mm class is 40.38%, the ash content is 40.79%, and contains a lot of pearl clay, Clay minerals such as kaolinite and double kaolinite, difficlut floated and high-ash coal slime that are easy sliming. The optimal flotation conditions of -0.5+0.25 mm, -0.25+0.074 mm and -0.074 mm classes (slurry concentration, collector dosage, frother dosage and mixing speed)were confirmed by the method of classification flotation. The optimal flotation conditions of -0.5+0.25 mm, -0.25+0.074 mm and -0.074 mm classes were compared with the whole flotation of -0.5mm class. The results show that the optimal dosage of reagents and process parameters for each size classes are different. Under the optimal flotation conditions, the yield of clean coal of classification flotation is higher than that of the full size flotation, and the ash content is lower than that of the full size flotation. The yield of tailings is lower than that of the full size flotation, and the ash content is higher than that of the full size flotation. That is, the flotation of the classification flotation is significant for the slime.
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Key words:
- High ash /
- Difficult to separate slime /
- Classification flotation /
- Size class
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表 1 煤泥的工业分析结果
Table 1. Industrial analysis results of coal slime
名称 水分 灰分 挥发分 固定碳 含量/% 1.85 39.75 16.62 41.78 
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表 2 原煤泥筛析结果
Table 2. Sieve analysis results of coal slime
粒级/mm 产率/% 灰分/% 筛上累积 筛下累计 产率/% 灰分/% 产率/% 灰分/% -0.5+0.25 15.45 36.79 15.45 36.79 100.00 39.17 -0.25+0.125 17.10 38.30 32.55 37.58 84.55 39.60 -0.125+0.074 13.27 38.47 45.82 37.84 67.45 39.94 -0.074+0.045 13.81 38.85 59.63 38.08 54.18 40.30 -0.045 40.37 40.79 100.00 39.17 40.37 40.79 总计 100.00 39.17
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表 3 各粒级煤泥给料浮选获得的精煤、中煤和尾煤实验结果
Table 3. Test results of various grades of slime clean coal, middling coal and tailings
给料粒级/mm 精煤 中煤 尾煤 产率/% 灰分/% 产率/% 灰分/% 产率/% 灰分/% -0.5 32.64 10.06 35.77 35.42 31.59 80.78 -0. 5+0. 25 35.42 9.72 37.15 25.97 27.43 84.59 -0. 25+0.074 36.25 8.76 42.36 32.57 21.39 85.60 -0.074 35.45 9.22 40.09 36.00 24.46 87.47
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