离子交换树脂吸附法提纯硼酸  

Purification of Boric Acid by Ion Exchange Resin Adsorption

作　　者：龚殿婷[1] 张宏军 

机构地区：[1]辽宁石油化工大学职业技术学院,抚顺113001 [2]新东北电气集团高压开关有限公司,沈阳110027

出　　处：《硅酸盐通报》2013年第1期166-171,共6页Bulletin of the Chinese Ceramic Society

摘　　要：离子交换吸附法是一种有效的提纯方法,实验选用732#强酸性阳离子与717#强碱性阴离子交换树脂,成功地提高了硼酸纯度。离子交换过程中,采用混合床,将传统方法的阴阳离子树脂体积比例由1∶1增加到3∶1利于吸附阴离子。实验研究了树脂粒度、硼酸溶液的浓度、溶液流速,树脂层的高度以及溶液温度对离子交换的影响。优化了离子交换过程中工艺参数,使其达到最佳交换吸附效果。实验结果表明,室温条件下,当树脂粒度为100目,硼酸溶液浓度在0.80 mol/L,交换层高度大于25 mm,交换时间在40 min,溶液流速为8 mL/min,树脂层高度大于800 mm可使离子充分交换,且始漏量大于96%,树脂交换的穿漏点为1.4 L。经离子交换吸附后,硼酸纯度可达到99.90%,其中的主要杂质含量Fe<1.96×10-6,Cl-<1.12×10-6,SO24-<5.14×10-6。Ion exchange adsorption is an effective purification method, in which 732# strong basic cation exchange resin and 717# strong-acid anion exchange resin were choosed. As a result, the purity of boric acid by ion exchange process was successfully improved. Adopting mixed bed ion exchange, when the anion and cation resin volume ratio was changed from traditional 1： 1 to 3： 1, it was helpful for the anion adsorption. The effects of process parameters on the ion exchange, such as grain size of resin, solution concentration of boric acid, solution flow rate, height of resin bed and solution temperature were studied. The ion exchange process parameters were optimized, as a result, the best exchange absorption effect was reached. The experimental results indicated that, under the condition of room temperature, resin grain size of 100 mesh, boric acid solution concentration of 0.80 mol/L, exchange height more than 25 mm, exchange time of 40 rain, solution flow rate at 8 mL/min, resin layer height of more than 800 mm could make the ion exchange fully completed. When the beginning leakage quantity was more than 96%, leakage point of resin exchange was 1.4 L. After ion exchange, the purity of boric acid could achieve 99. 90% and the main content of impurities was Fe 〈 1.96 × 10^-6,Cl- 〈 1.12 × 10^-6,SO4 2- 〈5.14 × 10^- 6, respectively.

关 键 词：硼酸 离子交换树脂 提纯 

分 类 号：TQ113.7[化学工程—无机化工]