New technology for recycling materials from oily cold rolling mill sludge

作者：Liu Bo; Zhang Shen gen^*; Tian Jian jun; Pan De an; Meng Ling; Liu Yang

来源：International Journal of Minerals,Metallurgy and Materials, 2013, 20(12): 1141-1147.

DOI：10.1007/s12613-013-0847-8

• cold rolling mills
• sludge disposal
• hydrometallurgy
• hydrothermal synthesis
• recycling
• waste utilization

Oily cold rolling mill (CRM) sludge is one of metallurgical industry solid wastes. The recycle of these wastes can not only protect the environment but also permit their reutilization. In this research, a new process of "hydrometallurgical treatment + hydrothermal synthesis" was investigated for the combined recovery of iron and organic materials from oily CRM sludge. Hydrometallurgical treatment, mainly including acid leaching, centrifugal separation, neutralization reaction, oxidizing, and preparation of hydrothermal reaction precursor, was first utilized for processing the sludge. Then, micaceous iron oxide (MIO) pigment powders were prepared through hydrothermal reaction of the obtained precursor in alkaline media. The separated organic materials can be used for fuel or chemical feedstock. The quality of the prepared MIO pigments is in accordance with the standards of MIO pigments for paints (ISO 10601-2007). This clean, effective, and economical technology offers a new way to recycle oily CRM sludge.

• 出版日期2013-12
• 单位北京科技大学