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- Title
Investigation of Freeze-Linings in a Nonferrous Industrial Slag.
- Authors
Fallah-Mehrjardi, Ata; Hayes, Peter; Vervynckt, Stephanie; Jak, Evgueni
- Abstract
Slag freeze-lining reactor wall protection is a widely used technology in high temperature reaction systems. An air-cooled probe technique was used to investigate the formation of the freeze-linings in an industrial blast furnace slag. The compositions of the phases and the microstructures within the deposits have been characterized. It has been demonstrated that an industrial air-cooled probe can be used to take bath samples from actual smelter operations. In addition, a laboratory-scale experiment was undertaken to investigate the formation, stability, and bath/deposit interface temperature at steady-state conditions. Importantly, the current study has shown that stable steady-state freeze-linings can be obtained in metallurgical reactors operating below the slag liquidus temperature. In spite of the fact that solids are present in the bulk slag, the deposit thickness remains unaltered due to the dynamic conditions present at the deposit/bath interface. The results are consistent with findings obtained on a number of other different slag systems and the proposed dynamic mechanism of deposit stabilization. The findings demonstrate the basis for, and potential benefits that may follow from, operating the high temperature reactors at temperatures below the liquidus temperature, i.e., with solids present, without a catastrophic build-up of solids. This change in design concept could result in significant decreases in operating temperature, energy, and operating cost savings.
- Subjects
NONFERROUS alloys; SLAG; CHEMICAL reactors; HIGH temperature chemistry; METAL microstructure; BLAST furnaces
- Publication
Metallurgical & Materials Transactions. Part B, 2014, Vol 45, Issue 3, p850
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-014-0074-3