摘要
Decomposition of lead sulfide concentrates in nitric acidic solutions after ferric (Ⅲ) nitrate addition and mechanical preparation has been investigated. It was found out that the decomposition can be achieved in HNO3 solution (>1.5 mol·L^-1) at the temperature above 85℃. The leaching rate of lead can be increased by means of mechanochemical activation. The use of [Fe(NO3)3-HNO3-H2O] aqueous salt system allows the decomposition of lead sulfide concentrate at room temperature and in this case the concentration of HNO3 does not exceed 0.05-0.1 mol.L^-1, The degree of lead recovery into solution from PbS concentrate reaches 99.3%-99.6c70 with the mechanochemical activation of this concentrate. The insoluble residues after the leaching contain SiO2, S^0, FeCO3 and PbSO4.
Decomposition of lead sulfide concentrates in nitric acidic solutions afterferric (Ⅲ) nitrate addition and mechanical preparation has been investigated. It was found out thatthe decomposition can be achieved in HNO_3 solution ( > 1.5 mol·L^(-1)) at the temperature above85℃. The leaching rate of lead can be increased by means of mechanochemical activation. The use of[Fe(NO_3)_(3-)HNO_(3-)H_2O] aqueous salt system allows the decomposition of lead sulfide concentrateat room temperature and in this case the concentration of HNO_3 does not exceed 0.05—0.1mol·L^(-1). The degree of lead recovery into solution from PbS concentrate reaches 99.3%―99.6%with the mechanochemical activation of this concentrate. The insoluble residues after the leachingcontain SiO_2, S^0, FeCO_3 and PbSO_4.
