PbZn 2020: The 9th International Symposium on Lead and Zinc Processing: Poster Session
Sponsored by: The Mining and Materails Processing Institute of Japan, Nonferrous Metals Society of China, GDMB: The Society for Mining, Metallurgy Resourcce and Environmental Technology, Metallurgy & Materials Society of the Canadian Institute of Mining, Metallurgy & Petroleum, TMS Extraction and Processing Division, TMS: Hydrometallurgy and Electrometallurgy Committee, TMS: Process Technology and Modeling Committee, TMS: Pyrometallurgy Committee, TMS: Recycling and Environmental Technologies Committee
Program Organizers: Andreas Siegmund, LanMetCon LLC; Shafiq Alam, University of Saskatchewan; Joseph Grogan, Gopher Resource; Ulrich Kerney, Recylex; Cheng Liu, China Enfi Engineering Corporation; Etsuro Shibata, Tohoku University
Tuesday 5:30 PM
February 25, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr
M-79: Reaction Mechanism on A Novel Enhanced Smelting Technique for Lead-acid Battery Paste Recycling: Wei Jin1; 1Central South University
Lead-acid batteries contain a lot of valuable metals, such as lead, tin, copper, antimony, as well as waste plastic shells and other harmful substances. Cleaner and efficient recycling of waste lead-acid batteries is of significance in environmental protection and comprehensive recycling of resources. In this study, oxygen-enriched side-blow pool smelting technique was developed and innovatively employed to recycle lead battery paste. This study investigated the reaction mechanism of lead recycling in lead paste-CaO-FeO-SiO2-C reaction system. Therefore, the phase transformation and evolution of lead paste in oxidizing atmosphere were described in detail. XRD and SEM-EDS analysis results indicated that the whole reaction evolution can be summarized as follows: PbO and PbS were formed from PbSO4 in a weak oxidizing atmosphere through the thermal decomposition and reduction reactions. Then the lead oxide formed was combined with slag-forming components (CaO, SiO2, FeC2O4·2H2O) to generate new oxides phase. As the temperature increases, metallic lead was extracted and recycled through the reactions between lead sulfide and the new-formed oxide phase.