Enriching And Recovering Low Concentration Wastewater Of Rare Earth Using Polymer Material

Rare earth elements is an irreplaceable role in strategic resource in many areas.In recent years,the national strategic level of the rare earth industry is fully integrated with reforms to effective exploitation and protection of rare earth resources.Thus recovered separating rare earth elements is a key research direction and this paper is to study for a low concentration of rare earths waste separation and recovery.Studies have shown that polymer-containing phosphate groups of rare earth ions have a good adsorption capacity,the paper using polyvinyl alcohol?PVA?as the matrix,by esterification,condensation reaction to obtain polyvinyl phosphate reduced glutaraldehyde?PPVG?,take Y³⁺as Case Study on adsorption of PPVG,while taking the actual wastewater dynamic adsorption experiments.The results showed that:PPVG has good adsorption properties on Y³⁺,the Langmuir adsorption isotherm model and second-order equation can be a good fit the adsorption,the dynamic adsorption breakthrough concentration of 1.72mg/L,the dynamic adsorption curve model in line with Thomas;Dynamic adsorption actual wastewater elution experiments also showed excellent adsorption effect PPVG to repeat the performance.In recent years Ion imprinting technology research on the recycling separation has been widely used and this paper take SiO₂ as matrix material,polyethyleneimine?PEI?as the functional monomer,production of synthesis Gd³⁺imprinted adsorbent material to study the adsorption properties of the Gd³⁺.The results showed that:pH of the solution absorption at around 6.0 best,and the Freundlich adsorption model fit the adsorption,while the dynamics of the result is in line with second-order equation,enter the particular ions from the adsorbent surface adsorption structure coordination process is the main speed control step;Selectivity experiments showed that the adsorbent can be better separated from the non-rare earth metal ions,elution experiments are somewhat less still need improvement.Also herein were performed on the catalytic metal compound catalyst oxidation treatment of methylene blue wastewater research,complex metal catalyst prepared to get a good result in the degradation experiments,the degradation rate over 98%.