A process scheme has been developed for the selective separation of sodium (Na) and potassium (K) from the bittern using a combination of adsorption – elution / evaporation / crystallization units. Adsorption – elution stages have been adopted for K enrichment from bittern using clinoptilolite as absorbent material and sodium nitrate as the subsequent eluent for the glass column. Then evaporation and cooling crystallization are appended to separate the sodium nitrate and potassium nitrate from the potassium-enriched solution. Afterwards, the mother liquor was completely recycled, and ten cycle experiments were carried out to determine that the purity of potassium nitrate, which exceeded 99%. Lastly, the endothermic process of preparing eluent and the exothermic process of potassium nitrate crystallization, can be capitalized by implementing a heat exchanger between the two processes and reduce the overall energy consumption. Thus, a heat flow simulation was carried out using Aspen plus software, and a temperature convergence was computed.

已经开发出了一种工艺方案，通过结合使用吸附-洗脱/蒸发/结晶装置从卤水中选择性地分离钠（Na）和钾（K）。吸附–洗脱阶段已采用斜发沸石作为吸收剂，而后用硝化钠作为玻璃柱的洗脱液，从卤水中富集钾。然后附加蒸发和冷却结晶，以从富钾溶液中分离出硝酸钠和硝酸钾。之后，将母液完全回收，并进行了十个循环实验以确定硝酸钾的纯度超过99％。最后是制备洗脱液的吸热过程和硝酸钾结晶的放热过程，通过在两个过程之间安装热交换器，可以降低成本，并降低整体能耗。因此，使用Aspen plus软件进行了热流模拟，并计算了温度收敛。