Synthesis Of Two N-type Adsorption Materials And Their Application In Recovery Of Rhenium From Leaching Solution Of Molybdenum Concentrate Roasting

Rhenium is widely used in weapon production,aerospace engine turbine blades,nuclear reactor structural materials and other defense and military industries because of its high melting point,high strength,good plasticity and mechanical stability.Rhenium does not exist in nature as an independent mineral,but is mainly associated with molybdenite.The leaching solution of molybdenum concentrate roasting is the key raw material for rhenium recovery.Therefore,it is of great significance to develop the recovery technology of rhenium under the background of high molybdenum for the recovery of rhenium resources in the leaching solution of molybdenum concentrate roasting.In this paper,two kinds of strong basic anion exchange resins were synthesized for low concentration rhenium in leaching solution of molybdenum concentrate roasting.Different separation and enrichment ideas were used to separate and enrich rhenium in leaching solution of molybdenum concentrate roasting.1.A special resin LSL-1 with high selectivity for rhenium was synthesized by using trimethylamine as functional group.The specific adsorption performance of the resin for rhenium was studied by static adsorption method.The results showed that LSL-1 resin had good separation and enrichment ability for Re(VII)under acidic conditions,and the saturated adsorption capacity was 153.94 mg·g^-1.In the whole adsorption process,the adsorption capacity of LSL-1 resin for Mo(VI)is weak.When the p H value is 2.5,the separation coefficient of rhenium and molybdenum is 337.53.The results of kinetics and isothermal adsorption showed that the adsorption process of Re(VII)on resin conformed to the pseudo second order kinetics model and Langmuir isothermal adsorption model,which was a monolayer adsorption process mainly controlled by chemical action.The adsorption of Re(VII)on the resin was characterized as an ion exchange reaction in which Cl^-was replaced by Re O₄^-and quaternary amino groups through N-O bond.The enrichment factor of LSL-1resin for low concentration Re(VII)in the actual eluent can reach 186 times,and Re(VII)on the resin can be desorbed with 20 mmol·L^-1 ammonia.2.Using N-methylimidazole as functional group,the resin LSL-N with adsorption capacity for rhenium and molybdenum was synthesized.The adsorption performance of the resin for rhenium and molybdenum was studied by static adsorption method.The results showed that LSL-N resin had good adsorption capacity for Re(VII)and Mo(VI),and the saturated adsorption capacity was 342.26 mg·g^-1 and 185.06 mg·g^-1,respectively.The kinetic and isothermal adsorption studies showed that the adsorption process of Re(VII)and Mo(VI)on the resin conformed to the pseudo second order kinetic model and Langmuir isothermal adsorption model,which was a monolayer adsorption process mainly controlled by chemical action.The results show that the adsorption of Re(VII)and Mo(VI)on the resin is an ion exchange reaction with quaternary amino group to replace Cl^-.LSL-N resin can simultaneously enrich Re(VII)and Mo(VI)in eluent,and the maximum enrichment factor is 134.8 and 38.6 respectively.Re(VII)and Mo(VI)can be desorbed step by step by using different desorbing agents,Re(VII)and Mo(VI)can be recovered at the same time.