Abstract
The prospects of processing blast furnace and steelmaking sludge using the Waelz process in a laboratory rotary kiln, is shown. The influence of different processing temperatures, furnace atmosphere and the type of reducing agents on the level of zinc reduction from sludges was analyzed. In general, the blast furnace sludge contains a high portion of iron (approx. 48 wt.%) and can be reused as a charge after satisfactory zinc reduction. It was found that N- atmosphere and a high content of the graphite or coke oven reducing agent in combination with high temperature can reduce the content of Zn in the sludge to 0.08 wt.% at 1200 °C for a mixture of steelmaking and blast furnace sludge. A significant reduction in the Zn content to 0.66 wt.% occurs at 1100 °C. The content and type of reducing agent plays an important role; graphite has shown a better reducing ability compared to coke oven dust. When nitrogen is used, zinc is reduced even without an additional reducing agent, since the carbon contained in the sludge is made use of for the reduction. In an air atmosphere, without the use of a reducing agent, there was no reduction in the Zn content.
Funder
EU Regional Development Fund within the Operational Programme Research
Development and Education under the aegis of Ministry of Education, Youth and Sports of the Czech Republic
Subject
General Materials Science,Metals and Alloys
Reference22 articles.
1. Brožová, S., Lisinska, M., Saternus, M., Gajda, B., Martynková, G.S., and Slíva, A. (2021). Hydrometallurgical recycling process for mobile phone, printed circuit boards using ozone. Metals, 11.
2. An overview of utilization of slag and sludge from steel industries;Conserv. Recycl.,2007
3. Leaching refuse after sphalerite mineral for extraction zinc and cobalt;Metalurgija,2016
4. Bartusek, J. (2010). Impact of Blast Furnace and Steelmaking Sludge Disposal on the Environment. [Ph.D. Thesis, VSB—Technical University of Ostrava].
5. Stewart, D.J.C., and Barron, A.R. (2020). Pyrometallurgical removal of zinc from basic oxygen steelmaking dust—A review of best available technology, Resource. Conserv. Recycl., 157.
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献