An alternative approach to recovering valuable metals from zinc phosphating sludge

作者：Kuo Yi Ming^*

来源：Journal of Hazardous Materials, 2012, 201: 265-272.

DOI：10.1016/j.jhazmat.2011.11.081

• Zinc phosphating sludge
• Recovery
• Vitrification
• Amorphous
• Basicity

This study used a vitrification process (with good potential for commercialization) to recover valuable metals from Zn phosphating sludge. The involved vitrification process achieves two major goals: it transformed hazardous Zn phosphating sludge into inert slag and it concentrated Fe (83.5%) and Zn (92.8%) into ingot and fine particulate-phase material, respectively. The Fe content in the ingot was 278,000 mg/kg, making the ingot a potential raw material for iron making. The fine particulate-phase material (collected from flue gas) contained abundant Zn (544,000 mg/kg) in the form of ZnO. The content (67.7%) of ZnO was high, so it can be directly sold to refineries. The recovered coarse particulate-phase material, with insufficient amount of ZnO, can be recycled as a feeding material for Zn re-concentration. Therefore, the vitrification process can not only treat hazardous materials but also effectively recover valuable metals.

• 出版日期2012-1-30