Dissolution Characteristics of Heavy Metal Ions and Na+,K+ in Red Mud Influenced by Different Environmental Factors
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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