摘要
模拟自然环境,研究了赤泥中重金属离子(As、Cr、Cu、Mn、Ni、Pb)和Na+、K+的溶出特性和机制.结果表明,降低pH值、增加接触时间、升高浸出温度和增大液固比,可促进赤泥中重金属离子和Na+、K+的溶出;溶出后方解石、镁绿泥石、戈硅钠铝石、磷锰铁矿等矿物的特征峰显著减弱,溶出赤泥中As、Cr、Ni、Cu、Mn、Na、K元素以As2O3、Cr3+、NiO、CuO、MnO、Na+、K+形式存在.
Abstract
The dissolution characteristics and mechanism of heavy metal ions(As,Cr,Cu,Mn,Ni,Pb)and Na+,K+in red mud were studied in a simulated natural environment.The results show that the dissolution of heavy metal ions,Na+and K+out of red mud can be promoted by reducing pH value,increasing contact time,raising leaching temperature,and increasing liquid-solid ratio.After dissolution,the characteristic peak values of calcite,magnesium chlorite,gosilicate and triploidite significantly become lower,and elements of As,Cr,Ni,Cu,Mn,Na and K,after dissolution out of red mud,exist in the forms of As2 O3,Cr3+,NiO,CuO,MnO,Na+and K+.
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