Study on Extraction of Dysprosium from Acidic Solution by P204 AITranslate

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Chinese Library Classification Number:TF845.3[冶金工程—有色金属冶金]

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Dy is extensively employed in low-carbon technologies,but its limited global reserves make the efficient separation of Dy from raw ore leachates and waste solutions crucial for the sustainable development of the rare earth industry and its related sectors.In this study,a solution of DyCl₃dissolved in hydrochloric acid was used as the aqueous phase,with P204 as the extractant and kerosene as the diluent,to investigate the extraction behavior of P204 for Dy(Ⅲ).The effects of various process parameters(extractant concentration,hydrochloric acid concentration,O/A phase ratio,extraction time,and extraction temperature)on the extraction rate of Dy(Ⅲ)were systematically examined and the extraction mechanism was further elucidated through infrared spectroscopy.The results indicate that the extraction rate of Dy(Ⅲ)initially increases and then stabilizes with rising P204 concentration,O/A ratio,and extraction time.In contrast,increasing the concentration of hydrochloric acid used to dissolve DyCl₃leads to a significant decline in Dy(Ⅲ)extraction rate,with the extraction process nearly ceasing at an HCl concentration of 3 mol/L.Temperature variations between 5℃ and 50℃ have minimal impact on Dy(Ⅲ)extraction rate.The optimized extraction conditions are determined as follows:P204 concentration of 0.2 mol/L,hydrochloric acid concentration of 0.02 mol/L,phase ratio of 1,room temperature,and extraction time of 60 min.Under these conditions,the extraction rate of Dy(Ⅲ)reaches nearly 90%.The essence of the extraction process is the formation of a dimer of P204 molecules,with the P=O double bond as the active site,where lone pair electrons of oxygen coordinate and bind with Dy(Ⅲ),accompanied by ion exchange between H⁺in the P OH group and Dy(Ⅲ),forming a stable neutral extraction complex that transfers to the organic phase.