Tungsten and Molybdenum Desorption of Strong Basic Anion Exchange Resin
The desorption of tungsten and molybdenum from ZGA351 porous strong basic anion exchange resin using NaOH+NaNO3 as desorption agent and H2O2 as strong oxidant was studied.The effects of combined adsorbent composition,concentration of NaOH,concentration of NaNO3,concentration and dosage of H2O2,flow rate ratio of NaOH+NaNO3/H2O2 and desorption times on the desorption of tungsten and molybdenum were investigated.The results show that under the conditions of NaOH concentration of 1.5 mol/L,NaNO3 concentration of 5％,H2O2 addition of 1.2 times the theoretical doasge,H2O2 concentration of 30％,the NaOH+NaNO3/H2O2 flow rate of 40 for 6 times,the tungsten and molybdenum desorption rate are 99.48％and 99.38％,respectively.The molybdenum penetration adsorption capacity of the resin is 107.10 g/L,which is similar to that of the new resin 107.77 g/L,indicating that the adsorption properties of ZGA351 resin remained basically unchanged after one desorption and cyclic adsorption.The mass concentration of tungsten in the primary desorption solution is 3.82 g/L,the mass concentration of molybdenum is 10.71 g/L,and the ratio of molybdenum to tungsten is 2.80.After adjusting the acid,it can be directly put into the subsequent industrial production section to make ammonium molybdate products.The results of 30 desorption and adsorption cycles show that the service life of the resin can meet the requirements of industrial production cost.The method synchronizes the process of liquid absorption oxygenation and resin regeneration.The process is simplified,the production cost is reduced,and a feasible process route is explored for the desorption process of large pore strong basic anion exchange resin.
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维普
