Study On Extraction Of Vanadium From Vanadium Bearing Minerals By Bioleaching Method And Selectively Adsorptive En-richment

Vanadium is widely used in the steel industry,and its application in chemical,vanadium battery,aerospace and other fields is increasingly widespread.Therefore,the extraction and recovery of vanadium have attracted wide attention,but traditional vanadium extraction and recovery processes waste seriously,and they also cause serious environmental pollution.What's more,there are numerous impurities in vanadium products.It is particularly necessary to explore a new process for extracting and recovering vanadium.Bioleaching of vanadium in stone coal by aerobic heterotrophic microorganisms was conducted.The results showed that aerobic heterotrophic microorganisms could effectively extract vanadium from stone coal.In the first three cycles,the vanadium leaching concentration remained at a relatively high level,and the maximum leaching concentrations reached 0.659 mg/L,0.676 mg/L,and 0.707 mg/L,respectively.Obvious corrosion pits were found on the surface of the stone coal after bioleaching.The content of vanadium in stone coal is significantly reduced.Analysis of highthroughput 16 S r RNA gene sequencing revealed that the metal oxidizing bacteria Acidovorax,Delftia and the assisted leaching microorganism Pseudomonas were significantly enriched in the bioleaching system.The leaching of vanadium from different vanadium-bearing minerals with Acidithiobacillus ferrooxidans revealed that the leaching effect of stone coal and clinker was better.The mud density,inoculation amount,initial p H and initial Fe2+ concentration influenced the leaching effect.With a mud density of 3%,an inoculum of 10%,an initial p H of 1.8,and an initial Fe2+ concentration of 3 g/L,the maximum leaching efficiencies of stone coal and clinker reach 50% and 59%,respectively;Both X-ray fluorescence and energy spectrum analysis confirmed the reduction of vanadium in the mineral.The results of morphological analysis of vanadium in the minerals before and after bioleaching showed that stone coal and clinker were effectively leachable in the acid-soluble fraction and oxidable fraction of vanadium.A kind of nano-ion exchange resin adsorbent HZO-201 was synthesized and its selective adsorption recovery of vanadium was studied.Compared with the original resin,HZO-201 has better adsorption performance,and the adsorption capcity of vanadium is as high as 120 mg/g.In the presence of competing ions,its performance of selective adsorption of vanadium was better.Using 5% Na OH + 10% Na Cl for desorption,the desorption rate was 91.2%.The adsorption kinetics of vanadium on HZO-201 was in accordance with the Pseudo-Second-Order Model,and the adsorption thermodynamics was in accordance with the Langmuir model.In summary,this study used environmentally friendly bioleaching technology to extract vanadium from minerals and developed a new adsorbent HZO-201 to selectively enrich vanadium to form a completely new process for the extraction and recovery of vanadium from minerals.Results provide a reliable theoretical basis and technical support for green smelting of vanadium minerals.