Abstract
5-Nonylsalicylaldoxime, LIX 622N was used to extract and recover Mo(VI) from sulfate leach liquor containing Mo(VI) and U(VI). The extraction parameters were optimized as 10%(v/v) LIX 622N diluted in kerosene at equilibrium pH1.0 and O/A phase ratio=1:1. Under these conditions, complete extraction of Mo(VI) was realized by a two-stage counter current extraction. The formed complex MoO2R2 is assessed by FTIR analysis. The molybdenum content in the organic phase was stripped using a mixture of 2M NH4OH+2M (NH4)2CO3. It was precipitated at pH value 2.0 as ammonium molybdate. After drying, thermal decomposition high purity (>99.9%) of MoO3 was produced. The effect of temperature on the Mo(VI) extraction process showed that, the extraction process is exothermic with enthalpy change −24.514kJmol−1.
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