|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||7th International Symposium on High Temperature Metallurgical Processing
||Solar-driven Carbothermal Zinc Recycling
||Nikolaos Tzouganatos, Christian Wieckert, Aldo Steinfeld
|On-Site Speaker (Planned)
Waelz oxide (WOX) is produced in the dominating Zn recycling process, the so called Waelz process, and contains 55-65% Zn in oxidic form. After its dehalogenation by washing, washed WOX is used as a feedstock along with ZnS concentrates for the electrolytic production of primary Zn. In the present study, environmentally cleaner process routes for the purification of crude WOX and the production of Zn were experimentally demonstrated using a 10 kWth packed-bed solar reactor subjected to concentrated solar radiation.
Solar-driven purification of WOX at above 1265°C reduced the amount of Cl- and Pb-compounds below 0.1 wt.%. Solar-driven carbothermal reduction using biocharcoal as the reducing agent at temperatures up to 1170 1320oC and ZnO:C molar ratios between 1:0.8 and 1:1.25 yielded 90 wt.% Zn.
A dynamic reactor model coupling heat transfer with the reaction kinetics was used to predict the reactor performance and optimize the solar reactor configuration.
||Planned: A print-only volume