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Preparation of NH4 +-loaded merlinoite for extracting potassium continuously at room temperature
Chenhong Tong,Jin Hou,Chunpeng Yang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
The preparation of NH4+-loaded merlinoite (N-zeolite) for extracting potassium was studiedsystematically in seawater. N-zeolite was gained from K+-loaded merlinoite (K-zeolite), in whichpotassium ions were exchanged by ammonium ions. The amount of reagents, hydrothermal reactiontemperature and reaction time were detailedly researched in order to obtain the optimized preparationconditions of N-zeolite. The experiment showed that the ion exchange between ammonium ions andpotassium ions could be instantly completed at room temperature. The ion exchange equilibrium andproperty of N-zeolite for potassium extraction were studied in seawater at room temperature. The resultsindicated the ion exchange capacity for potassium reached equilibrium in about 50 min. Since then, themaximum value of ion exchange capacity was 35.5 mg/g. The ion exchange separation factors for KKþ=Naþ,KKþ=Caþ2, KKþ=Mgþ2were 21, 91 and 247, respectively. N-zeolite had good properties of reproducibility andreutilization through six times of repeated modified experiments. K-zeolite and N-zeolite revealed areversible type-III isotherm characteristic by N2 adsorption–desorption experiments. The separationmechanism of N-zeolite for extracting potassium selectively was dominated by the memory function fora specific ion (K+) as well as the similar ion size.
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