The Degradation Of Xanthate And Synergistic Removal Of Heavy Metals In Flotation Wastewater By VUV Method

Flotation wastewater has been widely concerned because of its large water volume and complex composition,and some problems still exist such as it is difficult to treat flotation wastewater to satisfy the discharge standards or to reuse it.At present,the VUV irradiation method becomes a research hotspot for the treatment of organic polluted wastewater due to its simple operation,low cost and high efficiency.Exploring the influencing factors and mechanism of this method of collector PBX degradation,and the time range during which the maximum S^2-concentration occurs during the collector PBX degradation process,which has become the vital problem to the practical application of flotation wastewater treatment by VUV method.This work intends to use vacuum ultraviolet(VUV)irradiation to treat polluted wastewater,regarding the common collector butyl xanthate(PBX)of lead sulfide,and heavy metal ions(Cd,Pb,Zn)as the target pollutant.(1)The degradation effect of VUV irradiation method was compared with the oxidation process commonly used oxidants(Na Cl O and H₂O₂)on PBX.The PBX degradation rate and the maximum S^2-precipitation concentration were regarded as the evaluation standards.(2)On this basis,the single factor control variable method was used to deeply figure out the factors affecting the degradation of PBX wastewater by VUV method(p H,temperature,initial PBX concentration,anions and cations).The key factors affecting PBX degradation and the time when the maximum S^2-concentration appeared were also explored,and a kinetic model was subsequently established.By continuously measuring the changes of various parameters(p H?TOC?SO₄^2-),the degradation of PBX and its degradation by-products were discussed in conjunction with UV-Vis spectrum analysis.(3)On the basis of grasping the degradation effect of PBX,the laboratory experiment and fluidity experiment were carried to further explore the treatment effect of VUV method on simulated wastewater and beneficiation wastewater.The composition of the sediments was analyzed by XRD and FT-IR spectra characterization.The main results of this study are as follows:(1)The degradation effect of PBX by VUV method is better than other treatment methods,the degradation of PBX was 97.49%at 60 min,and more S^2-can be precipitated during the degradation process.(2)In the“VUV-PBX”system,the increase in reaction temperature and initial p H will promote the degradation of PBX.The increase of the initial PBX concentration will reduce the degradation rate constant of PBX;Si O₃^2-and CO₃^2-promote the degradation of PBX,and Ca²⁺inhibits the degradation of PBX.SO₄^2-,Cl^-and Na⁺have no obvious impact.The reaction temperature and initial p H are the key factors affecting the degradation of PBX.Based on these two factors,a kinetic model was established.(3)The time when the maximum concentration of S^2-appears is mainly related to the degradation rate constant of PBX,the reaction temperature and the initial concentration of PBX.(4)This method has significant effects on the removal of Cd,Pb and Zn,and the treated wastewater can satisfy the lead-zinc industry discharge standards.This study shows that VUV method has the advantages of simple operation,low cost and superior effect,and has the potential of practical application.VUV method degrades PBX efficiently and collaboratively removes heavy metals(Cd,Pb and Zn).This research can provide new ideas for mine wastewater treatment.