Abstract The continuous solvent extraction operations for the removal of molybdenum from ammonium tungstate solution was conducted using a solvent extraction system consisting of 10% (v/v) N263 as extractant and 30% (v/v) isooctanol as modifier in sulfonated kerosene for 63 h under optimized conditions in mixer-settlers. The concentration of Mo in raffinate was less than 10 mg/L with mass ratio of Mo/WO3 less than 6.0 × 10−5 and the concentration of Mo in strip liquor reached 30 g/L with mass ratio of WO3/Mo less than 1.0 × 10−2, which was consistent with the results of batch tests. The loaded organic solution and the oxidized organic solution were characterized by infrared spectroscopy and the results demonstrated that molybdenum exists in the form of [Mo2O11(H2O)2]2− in oxidized organic solution. The theoretical calculation of temperature change of the organic solution in oxidation process was conducted. The oxidant of 7 wt% H2O2 was recommended to be used during industrial production and a cooling water system has to be installed around the oxidation tank at the same time. The new process exhibited significant advantages of low overall costs, large value increase due to molybdenum producibility of MSA and environmental friendliness without wastewater and residue generation.

中文翻译：

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用季铵盐萃取剂从钨酸铵溶液中去除钼的连续溶剂萃取操作

摘要 采用以 10% (v/v) N263 为萃取剂和 30% (v/v) 异辛醇为改性剂的溶剂萃取系统，在 63 h 在混合沉降器的优化条件下。萃余液中Mo浓度小于10mg/L，Mo/WO3质量比小于6.0×10-5，汽提液Mo浓度达到30g/L，WO3/Mo质量比小于1.0 × 10−2，与批量试验结果一致。负载的有机溶液和氧化的有机溶液通过红外光谱表征，结果表明钼在氧化的有机溶液中以 [Mo2O11(H2O)2]2- 的形式存在。对氧化过程中有机溶液的温度变化进行了理论计算。工业生产中推荐使用7wt%H2O2氧化剂，同时在氧化槽周围安装冷却水系统。新工艺表现出总体成本低、MSA 钼可生产性带来的巨大增值以及无废水和残留物产生的环境友好性等显着优势。