2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 10: Battery, Recycling, Environmental, Mining
| Editors: | Kongoli F, Kumar V, Aifantis K, Pagnanelli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 220 pages |
| ISBN: | 978-1-987820-54-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Leaching and recycling of depleted lead-acid battery paste. A hydrometallurgical route to generating nanostructured leady oxide
Robert Liu1;1, Cambridge, Great Britain;
Type of Paper: Regular
Id Paper: 484
Topic: 14
Abstract:
Depleted lead paste materials from both the positive and negative grids of discarded lead-acid batteries as well as by-products derived from the gradual loss of these components through normal operation, known as shedding, were obtained from industry for leaching and recycling experiments. The main goal of this work is to develop an environmentally sustainable process to recycle spent lead paste materials consisting of PbO, PbO2 and PbSO4 in a cost effective manner.
The phase purity of precursor materials and crystal structure of products were determined by XRD. The thermal decomposition characteristics were investigated using TGA with SEM and EDX used to elucidate the microstructure and elemental distribution of each synthesised sample. Acid reactivity and BET/BJH analysis were conducted to determine the effects of various thermal processing methods on the microstructure of leached by-products and its corresponding relationship on reactivity and absorption.
An optimum stoichiometric reagent precursor to waste ratio was determined to obtain efficient and effective leaching of all depleted materials from industry. By-products from combustion-calcination experiments of leached materials were found to be nanostructured leady oxide. The degree of acid reactivity/absorption of generated nanostructured PbO varied greatly depending on the thermal processing method. The results obtained suggests a more complex interplay between acid reactivity/absorption and PbO microstructure than merely one that is dictated by surface area and particle size.