Thermal Recycling of Waelz Oxide using Concentrated Solar Energy
METADATA ONLY
Loading...
Author / Producer
Date
2013-12
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
METADATA ONLY
Data
Rights / License
Abstract
The dominating Zn recycling process is the so-called Waelz process. Waelz oxide (WOX), containing 55–65% Zn in oxidic form, is mainly derived from electric arc furnace dust produced during recycling of galvanized steel. After its wash treatment to separate off chlorides, WOX is used as feedstock along with ZnS concentrates for the electrolytic production of high-grade zinc. Novel and environmentally cleaner routes for the purification of WOX and the production of Zn are investigated using concentrated solar energy as the source of high-temperature process heat. The solar-driven clinkering of WOX and its carbothermal reduction were experimentally demonstrated using a 10 kWth packed-bed solar reactor. Solar clinkering at above 1265°C reduced the amount of impurities below 0.1 wt.%. Solar carbothermal reduction using biocharcoal as reducing agent in the 1170–1320°C range yielded 90 wt.% Zn.
Permanent link
Publication status
published
External links
Editor
Book title
Journal / series
Volume
65 (12)
Pages / Article No.
1733 - 1743
Publisher
Springer
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Organisational unit
03530 - Steinfeld, Aldo (emeritus) / Steinfeld, Aldo (emeritus)