The Application Of Diglycolamic Acid Extractant For Recycling Rare Earth And Precious Metals From Secondary Sources

The paper has two parts for the application of diglycolamic acid extractant for recycling rare earth and precios metals from secondary sources.In the first part,the prepared D2EHDGAA/[Cnmim][Tf2N]impregnated XAD-4 resin system and recycled Lu(III)from LYSO;In second part dissolving diglycolamic acid in different diluents for separation and recycling of Au(III)from other precious metals.Lutetium(Lu)is one of the most expensive of the lanthanides,recycling of rare earth Lu secondary resources has high value in recycling industries.The first part is that the novel functional XAD-type resin was prepared with diglycol amic acid derivative extractant and ionic liquid,and the resulting resin was introduced to recycling of the Lu secondary resource.Promisingly,the results showed that the resulting resin can efficiently recycle Lu and Y(III)from acid leaching solution of lutetium yttrium silicate scintillation crystal(LYSO)scraps under low pH conditions(0.5-2.4).The application of the imidazole-type ionic liquid solvent can help to improve the recovery rate of Lu and Y because of the ionic solvent effect.Furthermore,we evaluated heat-resistant separation and recyclability,and results indicated excellent performance of the diglycol amic acid functional XAD-4 resin for the practical management of LYSO scraps with hydrometallurgy.We examined a type of diglycolamic acid extractant,N,N-di-2-ethylhexyldiglycol amic acid(D2EHDGAA),for the selective extraction of Au(III)in acidic chloride solutions,including Pd(?),Pt(?),Rh(?),and Cu(?).We found that the selectivity of Au increased as the hydrochloric acid concentration increased.The extraction of Au(?)was quick and the extraction equilibrium was reached within 5 minutes.The n-dodecane and kerosene diluents that we used had a notable effect on the extraction of Au with the D2EHDGAA,and had excellent capacity in n-dodecane and kerosene.However,we found the separating factor of Au and Pd to be better in n-dodecane than it was in kerosene.We reused the D2EHDGAA for five cycles and it decreased less than 5%.