By R. A. Bergman (Eds.)
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Additional info for Ferrous and Non-Ferrous Alloy Processes. Proceedings of the International Symposium on Ferrous and Non–Ferrous Alloy Processes, Hamilton, Ontario, August 26–30, 1990
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Tikkanen, et al, "Methods to Reduce Alkali Attack in Blast Furnaces" Confidential research report, Jernkontoret, 1980. FERROUS AND NON-FERROUS ALLOY PROCESSES 47 APPENDIX Hearth Lining 1n Calcium Carbide Furnaces It should be noted that hearth conditions 1n calcium carbide furnaces are comparable to the conditions 1n FeS1/S1-metal furnaces. Heavy graph1t1zat1on of the carbon hearth has been observed in such furnaces, and thermal conductivity has been found to be close to conductivity of graphite.
H. Eric Department of Metallurgy and Materials Engineering, University of the Witwatersrand Abstract The reduction behaviour of manganese ores from the Mamatwan and Wessel mines has been studied by thermogravimetric analysis (TGA), X-ray diffraction analysis (XRD), optical microscopy, and energy dispersive analysis of x-rays (EDAX) between 1100 and 1350°C with pure graphite under an argon atmosphere. The rate and degree of reduction increased with increasing temperature and decreasing particle size.
Analyses of disintegrated bricks have very often shown increased alkali content, indicating that disintegration probably has been caused by alkali and CO gas according to (2). e. at upper mix levels and towards the side lining. Due to recirculation, the amount of alkali may increase to high levels. Apart from attacking the lining, formation of alkali carbonate will contribute to crust formations in the furnace. Analyses of samples from crusts have shown up to 20% alkali determined as oxides. As alkali will be present as carbonates, the content of alkali compounds in the crusts is even higher.