【作者】 曹玉川；

【导师】 伍喜庆；

【作者基本信息】 中南大学 ， 矿物加工工程， 2011， 硕士

【摘要】 我国铁矿资源以贫、细、杂为主,提铁降硅是浮选工业中最重要的一环,目前我国阴离子捕收剂应用比较普遍,但是阴离子反浮选工艺存在许多不足：药剂制度复杂(需使用调整剂、抑制剂、活化剂、捕收剂),操作复杂,药剂费用高,需加温浮选,另外矿浆pH较高对设备腐蚀也有影响。相比较而言,阳离子反浮选有很大的优势。本论文在总结和分析大量国内外相关文献的基础上,针对传统阳离子捕收剂泡沫丰富的缺点,开展了新型阳离子捕收剂的合成研究工作,通过试验研究,合成了一系列新型阳离子捕收剂。本论文成功筛选了一种新型阳离子捕收剂DHPA-3,合成工艺为摩尔比DDA:HOB为1：1.4,反应温度为60℃,反应时间为6小时。实际矿石试验结果表明：对含41.95%Fe的粗铁精矿,在自然pH条件下,添加DHPA-3捕收剂250g/t,淀粉1000g/t,仅经一次浮选获得了铁精矿62.60%Fe,铁回收率为53.87%的良好指标。捕收剂DHPA-3、十二胺、十二烷基二甲基叔胺和十二烷基三甲基氯化铵的粗铁精矿反浮选表明,DHPA-3和十二胺均取得了较好的浮选指标,十二烷基二甲基叔胺和十二烷基三甲基氯化铵的浮选指标则不太理想,捕收能力强弱顺序为：十二胺>DHPA-3>十二烷基二甲基叔胺>十二烷基三甲基氯化铵。三相泡沫试验结果表明：十二胺的三相泡沫最丰富,而且最不容易消泡,其它三种药剂泡沫性能则相差不大,消泡速度快慢顺序为：十二烷基三甲基氯化铵>DHPA-3>十二烷基二甲基叔胺>十二胺。二相泡沫试验结果表明：捕收剂DHPA-3、十二胺、十二烷基二甲基叔胺和十二烷基三甲基氯化铵比较而言,十二烷基二甲基叔胺的起泡能力弱于其它三种药剂,其它三种药剂的起泡能力则相差不大,从消泡时间来看,十二烷基三甲基氯化铵的消泡时间最短,其次为DHPA-3,后面是十二胺,消泡最慢是十二烷基二甲基叔胺,二相泡沫表现与三相泡沫稍有不同。淀粉在阳离子反浮选中不仅可以作为铁矿物的抑制剂,而且还能改善阳离子泡沫性能,适量淀粉的加入,使得阳离子捕收剂的泡沫量显著下降。更多还原

【Abstract】 The main characteristics of Chinese iron ore resources are poor, fine grained and complicated. It is important to add the flotation process to separate silicate from the iron ore. The anionic reverse flotation process is more popular currently, but there are many shortages:the complicated reagent system (with the regulator, depressant, activator, collector), complicated operation, high cost of reagents, higher flotation temperature, equipment corrosion. In comparison, cationic reverse flotation has great advantages.On the basis of the summary and analysis of many related references, a series of new cationic collectors are synthesized through lots of experimental research to improve the froth performance of traditional cationic collectors.A new cationic collector DHPA-3 is synthesized, the synthesis conditions:DDA:HOB=1:1.4(molar ratio), reaction temperature:60℃, reaction time:6 h.The test results of the real ore show that an iron concentrate of 62.60% Fe was obtained with a recovery of 53.87% through one roughing when using 1000g/t starch as depressant and 250g/t DHPA-3 as collector at natural pH. The feed grade is 41.95%.Flotation results show that using DHPA-3 and dodecyl amine as collectors tests achieved good separation while dodecyl dimethyl amine and dodecyl trimethyl ammonium chloride didn’t work well, and their collecting abilities are in the sequence of dodecyl amine> DHPA-3> dodecyl dimethyl amine> dodecyl trimethyl ammonium chloride.Tests of Three-phase froth indicated that dodecyl amine created biggest volume of froth and defoamed at the slowest rate, and their defoaming rate is in the sequence of dodecyl trimethyl ammonium chloride> DHPA-3> dodecyl dimethyl amine> dodecyl amine.Tests of Two-phase froth indicated that dodecyl dimethyl amine has weaker foaming ability, and three other reagents have the same foaming ability. Lauryl trimethyl ammonium chloride defoams fastest, while DHPA-3 defoams faster than dodecyl amine, dodecyl dimethyl amine defoams slowest. Two-phase froth has a little different performance from Three-phase froth.In the cationic reverse flotation of iron ore, starch not only can be used as depressant, but also can be used to improve the froth performance. Adding right amount of starch can significantly decrease the volume of froth.更多还原