Separation of nickel in manganese sulfate solution soaked out from low-grade pyrolusite with pyrite and H_2SO_4

摘要

The study on separation of nickel ions with S.D.D from six kinds of solutions or systems was conducted. One of six kinds of systems was prepared with the solution (called as original solution here) leached from pyrolusite with pyrite and H_2SO_4, and the other five kinds of systems were prepared with analytical reagents, they are respectively: a monophyletic system of NiSO_4, two binary systems of MnSO_4-NiSO_4 and (NH_4)_2SO_4-NiSO_4, a ternary system of MnSO_4-(NH_4)_2SO_4-NiSO_4, a pentanary system of MnSO_4-(NH_4)_2SO_4-NiSO_4-CoSO_4-ZnSO_4. The experiments about reaction time and S.D.D dosage were conducted. Results showed that the equilibrium time of reactions for the prepared five systems were equally 10 min at most, while 3 h was needed at least for original solution under the conditions of low temperature and low stirring speed. The residual nickel ion concentrations of the six systems were different when the same multiples of S.D.D theory dosage of each system was used for separation of nickel ions, and the S.D.D dosages for the six systems needed to meet the requirement of electrolysis were also different.