Comprehensive Utilization of Sulfuric Acid Residue with High Content of Copper by Pellet Production-Drying-Chloridizing Roasting

Abstract:

A new technology of pellet production-drying-chloridizing roasting is proposed for comprehensive utilization of sulfuric acid residue with high content of copper, a common by-product in vitriol industry. The sulfuric acid residue, containing 60.27% Fe, and 1.61% Cu, was pelletized with addition of 5% bentonite in pan pelletizer. Green balls after drying with 2.3% of water retention were roasting at 1100 °C for 30 min with 5 wt % of CaCl₂ addition in tube furnace. The results demonstrate that pellets with 60.58% of TFe, a copper volatite ratio of 97.8% were obtained with simultaneous decrease in the copper content down to 0.035%. Key technique is that CaCl₂ reacts with copper compounds and the chloride can be volatilized at moderate temperatures. This new technology can be used to fully utilize sulfuric acid residue and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of sulfuric acid residue and extend raw material sourcing for Chinese steel industry.

• Periodical: Advanced Materials Research (Volumes 524-527)
• Pages: 2004-2010
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.524-527.2004
• Online since: May 2012
• Authors: Shao Jun Bai, Shu Ming Wen, Jiu Shuai Deng, Dan Liu, Yu Chen
• Keywords: Calcium Chloride, Chloridizing Roasting, Comprehensive Utilization, Copper Volatile Ratio, Sulfuric Acid Residue

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