|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||PbZn 2020: The 9th International Symposium on Lead and Zinc Processing
||Recovery of Lead from Zinc Plant Residue by Alkaline Leaching Process Followed by Cementation
||Jonghyun Kim, Jae-chun Lee, Min-seuk Kim, Kyeong Woo Chung, K Kurniawan
|On-Site Speaker (Planned)
Present work focuses on recovery of lead from a zinc plant residue (ZPR) in alkaline media. Firstly, Zn and Pb were selectively extracted in NaOH from ZPR containing 56.9 % Pb, 0.34 % Ag, 3.93 % Zn, and 0.88 % Cu. Lead was effectively leached in a two-step process. The leach-I solubilized 39.5 % Pb and 58.5 % Zn in 2.0 M NaOH at 25 °C and 10 % pulp density in 30 min. Subsequent leaching in 3.0 M NaOH yielded overall extraction of >99 % Pb and 67 % Zn with stage efficiency of 59.5 % Pb and 8.5 % Zn. Above 99.9 % Pb was recovered from the leach liquor in 30 min at 25 °C and Zn: Pb mole ratio = 1.2:1.0 by cementation using Zn powder. Interestingly silver in the final residue was enriched from 0.3 % to 1.17 % making it a promising resource of Ag.