关键词: 湿法磷酸, 净化, 微分散, 萃取塔, 体积传质系数

Abstract: The mesh size of 75 μm of micro-dispersion rotating disc column was used to purify wet-process phosphoric acid with the system of TBP+kerosene/phosphoric acid/water. The effects of rotate speed，volume flow，phase ratio on the extraction and re-extraction of phosphoric acid with the content of 55% were studied. Results showed that the extraction rate increased with the increase of rotate speed and phase ratio，and decreased with the increase of volume flow. Under the optimum conditions of rotate speed of 250 r/min，volume flow of 56.62 L/(m2?min)，phase ratio of 4，and the extraction rate can be as high as 55%. The re-extraction rate was improved with the improvement of rotate speed，fell with the raise of phase ratio and volume flow. Under the best re-extraction conditions of rotate speed of 300r/min，volumetric flow of 56.62 L/(m2?min) phase ratio of 6，the re-extraction rate could be up to 85%. Non-dimensional expression for the volumetric mass transfer coefficient can be expressed asKXa=1.53×10?3p?0.28135Fr0.344493W/D，and the simulation matched the experimental results. The application of this model could provide a good experimental basis for industrial scale-up design and optimization.

Key words: wet-process phosphoric acid, purification, micro-dispersion, extraction column, volumetric mass transfer coefficient