阳离子捕收剂GE-609T的合成及其在铁矿反浮选中的应用

发布时间：2018-05-13 07:50

  本文选题：捕收剂 + 合成工艺　； 参考：《武汉理工大学》2015年硕士论文

【摘要】：目前国内针对提铁降硅的反浮选主要有两种工艺,一为阴离子反浮选工艺,其优点是流程稳定,产品指标好;缺点是选矿时需要加温,提高了选矿成本。二为阳离子反浮选工艺,优点是药剂制度简单,可在常低温下进行浮选,产品指标好;缺点是流程不稳定,泡沫难消,易跑槽,阻碍正常生产。本课题针对阳离子反浮选工艺存在的问题,在现有的阳离子捕收剂GE-609的基础上,选用异构脂肪醇和丙烯腈为合成药剂原料,并改进药剂合成工艺,生产出新型阳离子捕收剂GE-609T。通过工艺条件试验,确定合成醚胺(单胺醚)的最佳工艺条件为:(1)氰乙基化反应脂肪醇与丙烯腈药剂摩尔比为1∶1.05,催化剂KOH用量为脂肪醇用量的4.50‰,温度为45℃左右,反应时间为3h;(2)加氢还原反应催化剂用量为给料量的4.00‰,高压釜温度为150℃左右,高压釜的压力为2.5~3.0MPa。以醚胺和丙烯腈为原料合成二胺醚的最佳工艺条件为:(1)氰乙基化反应醚胺与丙烯腈药剂摩尔比为1∶1.1,催化剂KOH用量为醚胺用量的4.00‰,反应温度为45℃左右,反应时间为2.5h;(2)加氢还原反应催化剂用量为醚腈给料量的4.00‰,高压釜温度为140℃左右,高压釜的压力为2.5~3.0MPa。将GE-609T与GE-609以及十二胺进行药剂对比试验,结果显示,以GE-609T作为捕收剂的浮选指标最佳,精矿品位为60.49%;同时测定浮选泡沫量结果显示,GE-609T的泡沫量仅为十二胺的50%,且试验过程中其泡沫易消;相比于GE-609T,在指标一致的情况下,GE-609T的用量降低约20%。以合成药剂GE-609T为捕收剂针对酒钢焙烧磁精矿进行浮选试验,在最佳药剂制度以及一粗一精三反的流程条件下,开路精矿铁品位达到67.27%,回收率为73.52%;闭路产品中精品位66.50%、回收率89.06%。又针对庙沟铁矿进行浮选试验,在最佳药剂制度以工艺流程条件下,开路浮选铁精矿品位70.73%,回收率为82.87%。闭路试验结果为:精矿品位69.52%、回收率96.73%,浮选指标优良。通过本课题的研究,成功合成出一种适用于铁矿反浮脱硅的新型捕收剂GE-609T,该捕收剂捕收性强,分选效果明显,可在室内外常温下应用,浮选效率快,产品指标好,浮选泡沫易消去,药剂用量少,有效的降低了工艺成本。
[Abstract]:At present, there are two main reverse flotation processes in China, one is anionic reverse flotation, which has the advantages of stable process and good product index, and the disadvantage is that the ore dressing needs to be heated and the processing cost is increased. The other is the cationic reverse flotation process, which has the advantages of simple reagent system, good product index and low temperature floatation, and its disadvantages are unstable process, difficult foam elimination, easy running slot and hindering normal production. Aiming at the problems existing in cationic reverse flotation process, a new cationic collector GE-609T was produced by using isomeric fatty alcohol and acrylonitrile as raw materials on the basis of existing cationic collector GE-609. The optimum conditions for the synthesis of etheramine (monoamine ether) were determined as follows: the molar ratio of aliphatic alcohol to acrylonitrile was 1: 1.05, the amount of catalyst KOH was 4.50 鈥，

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