Investigation On Fenton-like Degradation Of Flotation Reagent In The Beneficiation Wastewater By MIL-101(Fe)

In recent years,the state has strict requirements on ecological and environmental protection,but many domestic mining areas are often limited by lag behind mining and processing technology,and lack of comprehensive treatment and recovery of the mining concept,a large number of target minerals and flotation drugs can only be discharged with the mining and processing wastewater.At present,mine environmental pollution control has become an urgent problem in the economic development of various countries.It should be the consensus of all countries in the development process to maximize the protection of the environment while developing the economy.Aniline aerofloat and butyl xanthate are two non-ferrous metal flotation reagents,which are consumed in large quantities in the process of sulfide ore dressing.Advanced oxidation technology is used in many kinds of organic wastewater treatment,and Fenton method is often cited,but it will produce iron sludge,and there are requirements on the p H of wastewater and other conditions,leading to the high cost of traditional Fenton treatment of organic wastewater.As a kind of material with abundant metal sites and channels,metal organic framework has a good application in Fenton method.In this study,the metal organic framework:MIL-101(Fe)was used as heterogeneous Fenton catalyst to degrade aniline aerofloat and butyl xanthate.The research contents and results are as follows:(1)The Fe-based metal organic framework MIL-101(Fe)was synthesized by hydrothermal methods and used as heterogeneous photo-fenton catalysts.In this study,the catalytic performance was evaluated by the degradation of aniline aerofloat under analog visible light.The catalyst were characterized by SEM,XRD,FTIR and BET.The effects of p H,H₂O₂dosage and initial concentration of aniline aerofloat solution were investigated for the degradation of aniline aerofloat.The results showed that MIL-101(Fe)photo-Fenton system had high catalytic activity and stability for aniline aerofloat degradation.The aniline aerofloat could be completely removed in 140min when MIL-101(Fe)dosage was0.267g/L,p H=7.The degradation rate decreased with the increase of the initial mass concentration of aniline aerofloat,but increased with the increase of the dosage of H₂O₂.·OH and h⁺were the main active substances in the reaction system.(2)Acorbic acid was added to MIL-101(Fe)Fenton-like system to enhance the degradation performance,and the Fenton-like system was used to degrade butyl xanthate.The effects of p H,H₂O₂concentration,initial concentration of butyl xanthate solution and ascorbic acid concentration on the degradation were investigated.The results showed that the highest degradation rate of H₂O₂/AA/MIL-101(Fe)system when the dosage of MIL-101(Fe)was 0.15g/L,p H was 5-9,H₂O₂was 15?L and ascorbic acid concentration was0.6mmol/L.The mechanism of ascorbic acid enhance the Fenton reaction was investigated by measuring the valence state of iron ion in the solution and the surface of MIL-101(Fe).Through the recycle experiment and the characterization of scanning electron microscope,it was found that the recoverability of MIL-101(Fe)under this system was slightly lower than that of the photo-fenton in previous section.The scanning electron microscope photos showed that the more times of recycling,the more damage does to the MIL-101(Fe)structure.