氧化-柱撑/离子交换法水云母中的提钾研究

Extracting Potassium from Hydromica by Oxidation-Pillar/Ion Exchange Method

为缓解我国钾资源的供需矛盾,采用氧化-柱撑/离子交换法从水云母中提取钾元素.在60℃温度条件下,水热反应水云母和氧化剂、柱撑剂、离子交换剂等反应试剂,过滤反应液,从滤液中得到可溶性钾盐.通过原子吸收分光光度计和X射线衍射,测定反应后提钾率和云母脱钾过程中的结构变化.实验结果表明,经过氧化-柱撑/离子交换后的水云母的层状硅酸盐结构未被破坏,基面间距由1.0 nm扩张到4.0 nm,14 h内层间K^+几乎被全部提取出来,提钾率高达98%.

To alleviate the supply and demand contradiction of potassium resources in China，we proposed a new oxidation-pillar/ion exchange method for extracting potassium from hydromica. The soluble sylvite was obtained by mixing oxidant，pillared agent and ion-exchange agent in hydration reaction system at 60 ℃. The extracting ratio of potassium was measured by atomic absorption spectrophotometer and the structural change of hydromica in the process of potassium release was characterized by X-ray diffraction. The experimental results indicate that product still keeps the structure of layer silicates by oxidation-pillar/ion exchange，the basal spacing of hydromica was expanded from 1.0 nm to 4.0 nm and the extraction rate of potassium is up to 98% in 14 h.