Comprehensive recovery of lead, zinc, and iron from hazardous jarosite residues using direct reduction followed by magnetic separation

• Published in: International journal of minerals, metallurgy and materials Vol. 25; no. 2; pp. 123 - 130
• Main Authors: Wang, Ya-yun, Yang, Hui-fen, Jiang, Bo, Song, Rong-long, Zhang, Wei-hao
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.02.2018; Springer Nature B.V; School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; Key Laboratory for High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Corrosion and Coatings; Direct reduced iron; Dosage; Field strength; Glass; Iron; Jarosite; Lead; Magnetic fields; Magnetic separation; Materials Science; Metallic Materials; Metallizing; Natural Materials; Optimization; Recovery; Residues; Roasting; Surfaces and Interfaces; Thin Films; Tribology; Vaporization; Zinc; 发铅;残余;磁性;分离;铁;锌;危险;恢复率; magnetic separation; recovery; direct reduction; valuable metals; jarosite residues
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-018-1555-1

Lead, zinc, and iron were recovered from jarosite residues using direct reduction followed by magnetic separation. The influence of the coal dosage, reduction temperature, and reduction time on the volatilization rates of lead and zinc and the metallization rate of iron were investigated. The results show that the volatilization rates of lead and zinc were 96.97% and 99.89%, respectively, and the iron metallization rate was 91.97% under the optimal reduction roasting conditions of a coal dosage of 25.0 wt% and reduction roasting at 1250°C for 60 min. The magnetic concentrate with an iron content of 90.59 wt% and an iron recovery rate of 50.87% was obtained under the optimum conditions in which 96.56% of the reduction product particles were smaller than 37 μm and the magnetic field strength was 24 k A/m. Therefore, the results of this study demonstrate that recovering valuable metals such as lead, zinc, and iron from jarosite residues is feasible using the developed approach.