Abstract
The washing solution of Zhundong coal is a multi-ions mixed system, and the extraction reactions of the alkali and alkaline earth metal ions in the water washing solution with polymer material of dicyclohexyl-18-crown-6 were investigated. The results show that the content of Na in the washing solution is highest, followed by K. Dicyclohexyl-18-crown-6 has better extraction rate of K due to the diameter of K has the same size with the hole diameter of dicyclohexyl-18-crown-6, which enables it could effectively separate Na and K, while did not cause excessive pollution of aqueous solution. Alkali and alkaline earth metal ions were extracted by dicyclohexyl-18-crown-6 in the form of 1:1. Improving the concentration of dicyclohexyl-18- crown-6 in organic phase could effectively enhance the extraction rate. It is not conducive to the extraction reaction by increasing temperature, as the extraction reaction is exothermic.
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