2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 3: Oye Intl. Symp. / Ionic Liquid and Aluminum
| Editors: | Kongoli F, Feng N, Polyakov P, Gaune-Escard M |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 180 pages |
| ISBN: | 978-1-987820-40-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Vacuum Distillation Process: A Sustainable Solution for the Recycling of Spent Pot Lining
Naixiang Feng1;1, Shenyang, China;
Type of Paper: Regular
Id Paper: 118
Topic: 37
Abstract:
Aluminum is the second most produced metals, only below iron. China is the top producer of primary aluminum with a production capacity of 38000 kt and output of 32000 kt in 2015. A large amount of spent pot lining (SPL) was produced after electrolytic pot failure. SPL is consisted of spent refractory materials and spent carbon cathode, which contains fluorides, alkali metals and oxides. SPL is considered as a hazardous material because it contains significant concentrations of toxic and leachable cyanides and fluorides. Nowadays, no economical and satisfactory process for the treatment of SPL has been developed in the world. Land filling of SPL, which was adopted by most Chinese smelters, not only pollutes the environment, but also wastes secondary resources. A new method, named Vacuum Distillation Process (VDP), was developed to separate effectively carbon from alkali metals and aluminum electrolyte in the spent carbon cathode. VDP can also be used to recycle the spent insulating materials by the addition of aluminum dust from the foundry shop. Aluminum reacts with alkali metal oxides to produce alkali metals. During the step of distillation cryolite-based electrolyte and alkali metals are removed from the insulating materials, which can be used again in prebaked cells. VDP technology can recycle SPL at very low cost. This paper presents you some important data on VDP.
Keywords:
Electro Winning of Aluminium ;References:
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