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摘要:
为提高柴油对低阶煤泥浮选的捕收性能，本研究将柴油和油酸复配制备的二元混合捕收剂作为低阶煤泥浮选的捕收剂。并通过接触角测试和Zeta电位测试探究了柴油和油酸的协同作用对改善低阶煤泥浮选效果的机理。研究结果表明，当柴油和油酸的质量比为3∶2（3C2Y），捕收剂用量为1 kg/t时，精煤产率和可燃体回收率最高，分别为65.66%和88.91%。经过3段浮选后，精煤灰分降低到了24.44%。柴油和油酸的协同作用使得煤颗粒表面的接触角提高了25°，煤颗粒表面的Zeta电位值降低了63.73 mV。因此，二元混合捕收剂能够使煤颗粒具有良好的疏水性和分散性，并且能够明显的改善低阶煤泥的浮选效果。柴油和油酸复配制得的二元混合捕收剂可作为高效开发利用低阶煤泥的新型捕收剂。
Abstract:In order to improve the collection performance of diesel on low-rank slime flotation, the binary mixed collector prepared by compounding diesel and oleic acid was used as the collector for low-rank slime flotation in this study. The mechanism of the synergistic effect of diesel oil and oleic acid on improving the flotation of low-rank coal slime was explored by the contact angle test and Zeta potential test. The results show that when the mass ratio of diesel and oleic acid is 3∶2(3C2Y) and the amount of collector is 1 kg/t, the clean coal yield and combustible recovery rate are the highest, which are 65.66% and 88.91% respectively. After 3-stage flotation, the ash content of clean coal was reduced to 24.44%. The synergistic effect of diesel oil and oleic acid increases the contact angle of the coal particle surface by 25° and reduces the Zeta potential value of the coal particle surface by 63.73 mV. Therefore, the binary mixed collector can make the coal particles have good hydrophobicity and dispersibility, and can obviously improve the flotation effect of low-rank coal slime.The binary mixed collector prepared from diesel and oleic acid can be used as a new type of collector for the efficient development and utilization of low-rank coal slime.
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Key words:
- diesel /
- oleic acid /
- low rank slime flotation /
- synergy
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表 1 煤泥的工业分析和有机元素分析
Table 1. Industrial analysis and organic element analysis of coal slime
工业分析/% 元素分析/% Mad Aad Vad FCad C H O N S 1.66 56.91 15.84 25.59 32.27 2.59 9.21 0.92 0.23 
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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/% +0.5 1.70 52.43 -0.5+0.25 2.19 52.59 -0.25+0.125 10.21 52.95 -0.125+0.074 12.81 53.25 -0.074+0.045 35.45 56.93 -0.045 37.64 59.78 总计 100.00 56.91
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