China Nonferrous Metallurgy

The residual organic phase in the tungsten-molybdenum stripping solution not only causes the loss of the organic phase but also reduces the recovery rate of tungsten and molybdenum. Macroporous resins have a porous network structure, large specific surface area, and hydrophobic oleophilic properties, which provide good adsorption for the organic phase. In this study, the SD300 macroporous resin was selected to conduct adsorption, desorption, and regeneration cycle experiments on the residual organic phase in the tungsten-molybdenum alkaline extraction stripping solution. The following main conclusions were obtained. Under the adsorption temperature of 20~40℃ and adsorption flow rate of 2~3BV/h, the resin organic phase breakthrough adsorption capacity was greater than 0.85g/mL, and the TOC removal rate was above 98.5%. Under the desorption temperature of 20~40℃ and desorption flow rate of 1BV/h, the ethanol dosage was less than 2.5BV, and the desorption rate was greater than 99%. After regeneration, the resin organic phase breakthrough adsorption capacity was greater than 0.85g/mL. After 10 adsorption-regeneration cycles, the resin organic phase breakthrough adsorption capacity was 0.850g/mL, and the TOC removal rate was 98.51%, with a decrease of 5.09% and 0.41% compared to the first cycle, respectively. The resin regeneration performance was good. When the ratio of the resin desorption liquid to the blank organic phase of the alkaline extraction was 1/100, the tungsten content in the loaded organic phase was 35.06g/L, and the molybdenum content was 3.53g/L. This method is suitable for high-salt solutions with high tungsten and molybdenum content, and it has a large processing capacity, high adsorption efficiency, simple desorption operation, low energy consumption, and the resin can be recycled. It fundamentally solves the problem of insoluble oily sludge in the tungsten-molybdenum extraction process and improves the recovery rate of valuable ions such as tungsten and molybdenum.