Recycle of valuable products from oily cold rolling mill sludge

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2013-10, Vol.20 (10), p.941-946
• Main Authors: Liu, Bo, Zhang, Shen-gen, Tian, Jian-jun, Pan, De-an, Liu, Yang, Volinsky, Alex A.
• Format: Article
• Language: English
• Subjects: Alloying elements; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cold rolling mills; Composites; Contaminants; Corrosion and Coatings; Distillation; Ferric oxide; Fuels; Glass; Hydrogen reduction; Iron; Materials Science; Metallic Materials; Natural Materials; Sludge; Surfaces and Interfaces; Thin Films; Tribology; Vacuum distillation; 三氧化二铁; 产品回收; 价值; 冷轧厂; 有机成分; 污泥; 油性; 真空蒸馏
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-013-0818-0

Oily cold rolling mill （CRM） sludge contains lots of iron and alloying elements along with plenty of hazardous organic components, which makes it as an attractive secondary source and an environmental contaminant at the same time. The compound methods of ＂vacuum distillation ＋ oxidizing roasting＂ and ＂vacuum distillation ＋ hydrogen reduction＂ were employed for the recycle of oily cold rolling mill sludge. First, the sludge was dynamically vacuum distilled in a rotating furnace at 50 r/rain and 600℃ for 3 h, which removed almost hazardous organic components, obtaining 89.2wt% ferrous resultant. Then, high purity ferric oxide powders （99.2wt%） and reduced iron powders （98.9wt%） were obtained when the distillation residues were oxidized and reduced, respectively. The distillation oil can be used for fuel or chemical feedstock, and the distillation gases can be collected and reused as a fuel.