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Mg2+is extracted from ammonium dihydrogen phosphate (NH4H2PO4) solution by an   emulsion liquid membrane (ELM) using mono-(2-ethylhexyl) 2-ethylhexyl   phosphonate (HEHPEHE)as a carrier, sulfonated liquid polybutadiene (LYF) as   a surfactant and kerosene as a solvent. To study the extraction efficiency   and advantages of the ELM process in the separation of Mg2+,the effects of   various operating conditions on the extraction -HEHPEHE volume fraction,   reaction temperature, treat ratio (emulsion phase / external phase), phase   ratio (membrane phase / internal phase), agitation speed, extraction time,   internal phase concentration, surfactant LYF concentration and initial pH of   NH4H2PO4 solution are experimentally investigated and discussed. The results   show that Mg2+ in NH4H2PO4 solution can be effectively removed by the ELM   process. An extraction efficiency of more than 83.1% is attained at the   optimized parameters and superior-grade NH4H2PO4can be obtained by two   levels of extraction

Study on Mg2+ removal from ammonium dihydrogen phosphate solution by an emulsion liquid membrane