Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 28    No. 11    November 2018

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A clean process of lead recovery from spent lead paste based on hydrothermal reduction
Wei-feng LIU1,2, Xun-bo DENG1, Du-chao ZHANG1, Tian-zu YANG1, Lin CHEN1

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Henan Yuguang Gold and Lead Group Co., Ltd., Jiyuan 459000, China

Abstract:An innovative process was proposed for recovering lead from spent lead paste, and it produced less pollution and used less energy than the traditional process. First, lead dioxide in lead paste was reduced by glucose under hydrothermal conditions. The effects of the reaction time, glucose excess coefficient, temperature and pH on the hydrothermal reduction were systematically investigated. Under the optimized reduction conditions (i.e., temperature of 175 °C, time of 120 min, glucose excess coefficient of 3.0 and pH of 5.5), 99.9% reduction ratio of lead dioxide is achieved, and only the PbO·PbSO4 and PbSO4 phases are observed in the reducing residue. Subsequently, the reducing residue is desulfurized in a NaOH solution, and approximately 99.40% of the sulfur is removed. The main lead phase in the desulfurization residue is 3PbO·H2O.

 

Key words: spent lead paste; hydrothermal reduction; glucose; desulfurization

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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