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Published on: January 7, 2019
Phase conversion characteristics of lead sulfate in ferric sulfate medium
Pu Sun1, Jibo Wang1, Xingbin Li1
1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Abstract:
The phase transformation characteristics of lead sulfate (PbSO4) in a sulfuric acid (H2SO4) system were studied, focusing on the effects of temperature, H2SO4 concentration, ferric iron (Fe3+) concentration, sodium sulfate (Na2SO4), and potassium sulfate (K2SO4). The conversion of PbSO4 was analyzed by characterizing the composition and structure of the solid product through XRD, SEM/BSE-EDS, and FT-IR. The results indicated that the effect of temperature on PbSO4 transformation was influenced by H2SO4 concentration. The temperature threshold for PbSO4 conversion to lead jarosite (Pb-J) decreased from 150 to 90 ℃ as H2SO4 concentration decreased from 20 to 5 g/L. At 150 ℃, the amount of jarosite generated decreased significantly from 86.04 to 9.76 %. Subsequently, when H2SO4 concentration exceeded 40 g/L, PbSO4 was essentially unchanged. Concurrently, Pb-J formation correlated with the partial formation of hydronium jarosite (H-J). The production of jarosite was inhibited when the solution pH was ∼ 0.3 or lower. Furthermore, the increase in Fe3+ concentration facilitated Pb-J formation, whereas Na2SO4 and K2SO4 inhibited Pb-J formation, leading to the formation of potassium jarosite (K-J) and sodium jarosite (Na-J), respectively. This study provided insights into regulating PbSO4 conversion during sulfide ore oxygen pressure leaching.
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