Study on Low Rank Coal Flotation Enhancement by Carboxylic Acid Collector Prepared from Gutter Oil
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摘要:
由于低阶煤表面含氧官能团的存在，用传统的非极性油捕收剂无法实现低阶煤泥的有效回收。与使用传统柴油捕收剂对比，本文在地沟油醇解为生物柴油的基础上进一步合成含有羧酸官能团的捕收剂来强化低阶煤浮选。通过红外光谱分析、核磁氢谱分析、X射线光电子能谱分析和接触角测定进一步分析了捕收剂促进浮选的机理。分别使用羧酸捕收剂、0#柴油与生物柴油对某低阶极难浮选煤样进行浮选实验，结果表明，羧酸捕收剂获得的浮选精煤效果最好，比柴油捕收剂，精煤产率提升了14.63%，灰分下降了12.06%。
Abstract:Traditional non-polar oil collectors cannot achieve high recovery of low-rank coal because of the presence ofoxygen-containing groups at coal surface. Compared with the traditional diesel collector, the collector containing carboxylic acid functional groups was further synthesized to enhance the flotation of low rank coal based on the alcoholysis of waste oil into biodiesel. The mechanism of collector promoting flotation was further analyzed by infrared spectroscopy, nuclear magnetic hydrogen spectroscopy, X-ray photoelectron spectroscopy and contact angle measurement. Carboxylic acid collector, 0# diesel oil and biodiesel were used to carry out flotation tests on a low-level extremely difficult coal sample. The results showed that the carboxylic acid collector had the best flotation effect on clean coal. Compared with diesel collector, the yield of clean coal increased by 14.63%, and the ash content decreased by 12.06%.
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表 1 煤样筛析结果
Table 1. Sieve analysis results of coal sample
粒级/mm 产率/% 灰分/% 累计产率/% 累计灰分/% +0.250 25.19 15.75 25.19 15.75 -0.250+0.178 14.39 31.93 39.59 21.63 -0.178+0.124 17.06 43.42 56.65 28.19 -0.124+0.089 11.80 40.55 68.44 30.32 -0.089+0.074 6.48 37.35 74.93 30.93 -0.074 25.07 29.76 100.00 30.64 合计 100.00 30.64 —— —— 
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表 2 低阶煤煤样浮选速度实验结果
Table 2. Flotation velocity test results of low rank coal samples
产物 产率
/%灰分
/%精煤累计 尾煤累计 产率/% 灰分/% 产率/% 灰分/% 精煤1 14.00 8.17 14.00 8.17 100.00 31.42 精煤2 11.18 8.39 25.18 8.27 86.00 35.20 精煤3 3.60 8.55 28.78 8.30 74.82 39.21 精煤4 0.87 9.26 29.65 8.33 71.22 40.75 尾煤 70.35 41.14 100.00 31.42 70.35 41.14 合计 100.00 31.42
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表 3 不同捕收剂浮选实验结果
Table 3. Flotation test results of different collectors
实验编号 捕收剂种类 起泡剂 捕收剂用量/ (kg·t-1) 药剂比 精煤 尾煤 产率/% 灰分/% 产率/% 灰分/% NO.1 0#柴油 仲辛醇 0.12 10︰1 8.27 23.67 91.73 30.08 NO.2 生物柴油 仲辛醇 0.12 10︰1 6.91 18.13 93.09 30.13 NO.3 羧酸捕收剂 仲辛醇 0.12 10︰1 22.90 11.61 77.10 34.23
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