Comprehensive Recycling Technology And Process Sulfide Acid Mine Drainage Resources

The Sulfide mine acid drainage,which contains acid and heavy metal ions not only causesthe serious pollution of water, but also poses a serious threat to ecological environment and evenhuman health if discharged directly without treating.The heavy metal ions treatment in mine aciddrainage is an important subject in the field of environment protection for a long time. The studyof recycling valuable ions in mine acid drainage are relatively fewer at home and abroad atpresent,so carrying out the heavy metal ions removing from acid drainage and resource recyclingis of great significance to environment protection.Based on many advantages of small solubility,low moisture content of sediment, withoutcausing secondary pollution,high grade of valuable metals in the slag about sulfurization-precipitation method;and Simple operation,high separation efficiency about ion-exchange method,two methods were used to treat mine acid drainage deeply, in which the concentrations of Zn²⁺,Ni²⁺and Co²⁺are100mg/L,7mg/L and8mg/L respectively. The results show that theconcentrations of Zn²⁺、Ni²⁺and Co²⁺can reach the emission standards of《Emission standard ofpollutants for copper, nickel, cobalt industry》（GB25467-2010）:Zn²⁺≤4mg/L、Ni²⁺≤0.5mg/L、Co²⁺≤1mg/L,and realize wastewater reuse.The remove of heavy metal zinc in acid drainage by potential regulation-sulfide precipi-tation was studied.Carrying out the experiment research on the lime neutralization precipitationpreprocessing,choice of vulcanizing agent, effects of pH, flocculant dosage, laws betweenoxidation reduction potential（ORP） sulfide precipitation zinc zinc reaction.Results show thatthe amount of10%CaO was7.5¹4mL/L, precipitation time of iron within30min, pH in3.05⁴.06, the removal rate of iron can reach above80%; NaHS as vulcanizing agent,sulfideprecipitation zinc pH value in3.4, PAM flocculant dosing quantity1mL/L, ORP at6⁷6mv, theremoval rate of zinc ions in acid drainage reached over96.85%.Effect of resin types,pH,temperature and time on the resin adsorption were investigatedthrough static experiments of ion-exchange.The results show that,the type of WP-2resin was themost suitable for this experiment wastewater treatment; When the pH was5.1, the resin removalrate was the largest to nickel ions in wastewater. the adsorption kinetics of resin adsorption Ni²⁺was studied,using primary and secondary equation to fit respectively, results show that process ofWP-2resin adsorption Ni²⁺was better developed for the Lagergren secondary dynamicmodel,and high temperature is advantageous to the resin adsorption of Ni²⁺;The dosage of resin isstudied,the best dosage of resin is0.1g.The influence of flow velocity on dynamic exchange and the formation of the outflowcurve;and the influence of desorption reagent type,concentration,flow velocity,agent on dynamic desorption were studied through dynamic adsorption-desorption experiments, and resourcefultreatment of enrichment liquid was discussed. The experiment results show that:the flow rate40BV/h,the outflow liquid110BV,resin adsorption saturation achieved.When6BV H2SO4（8%）through the saturated resin layer with the flow rate20BV/h, the desorption rate can reach100%,the content Ni²⁺and Co²⁺in enrichment liquid can reach220.45mg/L,230.58mg/L respectively.