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煤乳化浮选药剂的制备与应用机理研究
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摘要
本文采用天然油脂为主要原料,合成出兼具促进作用的乳化剂;应用该乳化剂制备含油27%,稳定性可达3个月左右不分层的乳化油。以8种不同变质程度的煤泥为主要研究对象,分别应用乳化油和柴油为捕收剂进行实验室对比实验,研究表明使用乳化油可显著提高实验煤样的浮选效果,在精煤灰分相近的情况下,可燃体回收率可提高1%-6%,节油70%。对八种煤样的浮选动力学进行研究,发现应用乳化油可大大提高浮选速度。通过对乳化剂作用前后煤样的红外光谱(FTIR)分析、ζ电位、润湿热及疏水性测定,揭示了乳化剂与煤粒表面的含氧官能团等极性基发生化学吸附,非极性基团朝外,起到活性基的作用,帮助非极性烃类油在煤粒表面铺展,从而起到促进作用。
In this paper, seed oil was adopted as main raw material to synthesis the emulsifier with promoter properties. The stable and homogeneous emulsified oil containing 3% emulsifier and 70% water was prepared. The emulsified oil and diesel oil were used as the collector to do the lab contrast test for the 8 kinds of different coalification range coal slime. When ash content of the concentrate was basically the same, it was found that using emulsified oil could obviously enhance the floatation results for the coal slime tested, and the combustible recovery increased by 1%-6% than using diesel oil. According to the floatation kinetics studies of 8 coal samples, it was proved that using emulsified oil could heighten the floatation rate greatly. Through the FTIR analysis, wetting heat, zeta-potential and contact angle measurement, it was indicated that chemiadsorption occured between emulsifier and oxygen-containing functional groups of the coal surface. The non-polar group of the emulsifier was outside, possibly acted as activated pole to speed up the spreading of hydrocarbon oil on the coal surfaces, to promote the floatation.
引文
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