Preliminary reduction of chromium ore using Si sludge generated in silicon wafer manufacturing process

In order to promote the recycling of by-product from Si wafer manufacturing process and to develop environment-friend and low cost process for ferrochrome alloy production, a basic study was performed on the preliminary reduction reaction between chromium ore and the Si sludge, comprised of SiC and...

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Bibliographic Details
Published in:Journal of mining and metallurgy. Section B, Metallurgy Metallurgy, 2018, Vol.54 (1), p.29-37
Main Authors: Jung, W.-G., Back, G.-S., Johra, F.T., Kim, J.-H., Chang, Y.-C., Yoo, S.-J.
Format: Article
Language:English
Subjects:
Alloys
Alternative energy sources
Carbon
Chemical reduction
chromium ore
Chromium ores
Cordierite
Corrosion resistance
Energy industry
ferrochrome
Iron
Manufacturing
Metal particles
Metallurgy
Mixing ratio
pre-reduction
Reduction (metal working)
Renewable resources
silicon
Silicon carbide
Silicon dioxide
silicon sludge
Silicon wafers
Sludge
Stainless steel
Steel production
Steel products
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Summary:In order to promote the recycling of by-product from Si wafer manufacturing process and to develop environment-friend and low cost process for ferrochrome alloy production, a basic study was performed on the preliminary reduction reaction between chromium ore and the Si sludge, comprised of SiC and Si particles, which is recovered from the Si wafer manufacturing process for the semiconductor and solar cell industries. Pellets were first made by mixing chromium ore, Si sludge, and some binders in the designed mixing ratios and were then treated at different temperatures in the 1116?C?1388?C range in an ambient atmosphere. Cordierite and SiO2 were confirmed to be formed in the products after the reduction. Additionally, metal particles were observed in the product with Fe, Cr, and Si components. It is found that temperatures above 1300?C are necessary for the reduction of the chromium ore by the Si sludge. The reduction ratio for Fe was evaluated quantitatively for our experimental conditions, and the proper mixing ratio was suggested for the pre-reduction of the chromium ore by the Si sludge. This study provides basic information for the production of ferrochrome alloys on the pre-reduction of chromium ore using Si sludge. nema
ISSN:1450-5339
2217-7175
DOI:10.2298/JMMB170520054J