正长石矿物与氯化钠离子交换反应实验研究

Experimental research on ion exchange reactions of orthoclase with sodium chloride

将正长石与氯化钠进行混合,在810℃的温度条件下进行反应。对反应前后的样品进行XRF的定量成分分析。2 g长石与20 g NaCl反应时间分别为12、24、36、48、72 h,反应后Na2O含量从3.35%分别达到了9.05%、9.33%、10.1%、10.5%和10.8%;与40 g NaCl混合后长石中的Na2O含量则分别变为9.98%、10.3%、10.5%、10.9%和11.9%。反应12 h后正长石的离子交换速度减缓,离子交换量缓慢增加。计算离子交换反应的Na+分配系数,可以看出高浓度的NaCl熔盐相对于低浓度的熔盐,离子交换反应的分配系数值更高,反应进行的更加充分。正长石在高温条件下显示部分离子筛效应,可以成为良好的离子交换剂材料。

In this study,orthoclase and sodium chloride powder were mixed up,and their chemical reaction was carried out at 810℃.The XRF analysis was applied to analyze the chemical composition before and after the reaction quantitatively.Two grams of orthoclase were mixed with 20 g and 40 g powders of NaCl,and the reaction lasted for 12,24,36,48,72 hours respectively.After mixture with 20 g NaCl,the content of Na2O in orthoclase varied from 3.35 ％ in original samples to 9.05 ％,9.33 ％,10.1％,10.5 ％ and 10.8 ％ in the resultant materials,separately.However,after mixture with 40 g NaCl,the content varied to 9.98％,10.3 ％,10.5％,10.9％ and 11.9％ correspondingly in the same time span.Ion exchange velocities for orthoclase slowed down after 12 hours and the quantity of ion exchange increased slowly.The Na＋ distribution coefficient was calculated according to the formula of ion exchange reaction.The Na＋ distribution coefficient for molten salt of higher concentration was higher than that of lower concentration in the experiment and the reaction under the condition of higher concentration proceeded more thoroughly.Orthoclase could serve as a good material of ion exchange.