钾盐正浮选捕收剂—十八烷胺的浮

发布时间：2018-06-27 01:21

本文选题：钾盐浮选捕收剂 + 十八烷胺　；参考：《青海师范大学》2015年硕士论文

【摘要】：以分光光度法测定卤水中的十八烷胺。将样品中的十八烷胺萃出,向萃取得到的三氯甲烷-十八烷胺体系内添加溴甲酚绿的三氯甲烷溶液进行显色,显色后在特定波长下测量吸光度,得到十八烷胺浓度。实验结果表明:溴甲酚绿可以对三氯甲烷中的十八烷胺进行显色,最大吸收波长在421.5 nm处,该方法在0-4μg/mL范围内符合朗伯-比尔定律,线性相关系数R2=0.9985,加样回收率为101.8%,RSD=1.475%。实验将此方法进一步拓展,将有机相三氯甲烷替换成环己烷,测定环己烷中十八烷胺的含量。实验结果表明:溴甲酚绿亦可对环己烷中的十八烷胺显色,最大吸收波长在416.5 nm处,在0-5μg/mL范围内符合朗伯-比尔定律,线性相关系数R2=0.9996,加样回收率为98.28%,RSD=3.87%。此种方法灵敏度高,重现性好,并为后续实验提供了一种操作简单,方便快捷的测定十八烷胺浓度的新方法。在浮选水溶液中十八烷胺的基础上利用溶剂浮选法分离实际卤水中的十八烷胺。实验结果表明:以环己烷为浮选溶剂浮选十八烷胺溶液,初始浓度为10μg/mL,溶液pH=10,浮选时间为40 min,空气流速为64 mL/min时,十八烷胺的回收率为80.12%;以环己烷为浮选溶剂浮选盐湖卤水中的十八烷胺,浮选pH=6,浮选时间为50 min,空气流速为64 m L/min时,十八烷胺的回收率达到84.31%。采用凹凸棒石吸附水中的十八烷胺。在材料表征的基础上,考察了吸附剂初始浓度、吸附时间及溶液pH对凹凸棒石吸附十八烷胺的影响。结果表明,凹凸棒对十八烷胺的吸附效果良好,且吸附率随着吸附剂用量和时间的增加而增加,吸附时间为2.5h时吸附达到平衡,pH值为8-10时的吸附效果最好。以Fe3O4复合埃洛石制备了磁性埃洛石吸附材料,并对材料进行表征,以此材料吸附水中的十八烷胺,研究了吸附剂初始浓度、吸附时间及溶液pH对磁性埃洛石吸附十八烷胺的影响。结果表明吸附率随着吸附剂用量和时间的增加而增加,吸附时间为3h时吸附达到平衡,pH值为10左右时的吸附效果最好。利用介质阻挡放电等离子体技术处理水中的十八烷胺。实验结果表明:初始浓度为6μg/mL、放电功率为160 W、初始pH=10、曝气量为100 mL/min、处理时间为60 min时,十八烷胺的去除率达到90%。
[Abstract]:Octadecylamine in brine was determined by spectrophotometry. The octadecylamine was extracted from the sample, and the concentration of octadecylamine was obtained by adding bromo-cresol green to the system of trichloromethane-octadecylamine. The absorbance of octadecylamine was measured at a specific wavelength. The experimental results show that bromocresol green can color octadecylamine in trichloromethane. The maximum absorption wavelength is at 421.5 nm. The method obeys Lambert-Beer 's law in the range of 0-4 渭 g / mL, the linear correlation coefficient is 0.9985, and the recovery is 101.8%. The method was further developed by replacing the organic phase trichloromethane with cyclohexane and determining the content of octadecylamine in cyclohexane. The experimental results show that bromocresol green can also develop octadecylamine in cyclohexane. The maximum absorption wavelength is at 416.5 nm and the linear correlation coefficient is R _ 2N _ (0.9996) in the range of 0-5 渭 g / mL, the linear correlation coefficient is 0.9996, and the recovery is 98.28 ~ 3.87g / mL. This method has high sensitivity and good reproducibility, and provides a new method for the determination of octadecylamine concentration. Octadecylamine in real brine was separated by solvent flotation on the basis of flotation of octadecylamine in aqueous solution. The experimental results show that when the initial concentration is 10 渭 g / mL, pH is 10, flotation time is 40 min, air flow rate is 64 mL / min, cyclohexane is used as the flotation solvent for the flotation of octadecylamine solution, the initial concentration is 10 渭 g / mL, and the flotation time is 40 min. The recovery rate of octadecylamine is 80.12 and the recovery rate of octadecylamine is 84.31 when the flotation pH is 6, the flotation time is 50 min, the air flow rate is 64 mL / min, and cyclohexane is used as the flotation solvent for the flotation of octadecylamine in salt lake brine. Attapulgite was used to adsorb octadecylamine in water. The effects of initial concentration of adsorbent, adsorption time and pH of solution on the adsorption of octadecylamine by attapulgite were investigated. The results showed that the adsorption effect of attapulgite on octadecylamine was good, and the adsorption rate increased with the increase of the amount of adsorbent and time. The best adsorption effect was achieved when the adsorption time was 2.5 h when the equilibrium pH value was 8-10. The magnetic errolite adsorbent was prepared from Fe _ 3O _ 4 composite errolide and characterized to adsorb octadecylamine in water. The initial concentration of adsorbent was studied. The effect of adsorption time and pH value on the adsorption of octadecylamine by magnetic aloxite. The results show that the adsorption rate increases with the increase of the amount of adsorbent and the adsorption time. When the adsorption time is 3 h, the adsorption efficiency is the best when the adsorption reaches the equilibrium pH value of about 10. Octadecylamine in water was treated by dielectric barrier discharge (DBD) plasma technique. The experimental results show that when the initial concentration is 6 渭 g / mL, the discharge power is 160 W, the initial pH is 10, the aeration rate is 100 mL / min, and the treatment time is 60 min, the removal rate of octadecylamine reaches 90%.
【学位授予单位】：青海师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD923;TS392

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