Recovery Nickel-Ferrous Compound from Nickel-Bearing Secondary Resources
The stainless steel pickling sludge contained valuable metals such as Fe, Cr, and Ni and was a second Ni-bearing resource. It was essential to explore an economical technology for recovery metals from the low grade pickling sludge. The method of carbon thermal reduction–magnetic separation process was proposed to not only recover Fe, Cr, and Ni from the stainless steel sludge, but also dispose waste environmental friendly. The weight variety and phases change were characterized with TG-DSC and XRD. The influence of reduction temperature, the ratio of C/O (carbon/oxygen), the reaction time, and addition of pickling sludge were investigated. The experimental results showed that the best reduction condition was at temperature 1350 °C, with 1.0 C/O ratio. The recovery rate of Ni and Fe was reached up to 97.86 and 96.07%, respectively, under this condition. Meanwhile, the contents of Fe, Ni, and Cr of the tailings were 4.04, 0.06, and 0.09%.
KeywordsStainless steel sludge Reduction magnetic separation Metals granular Laterite ore tailing
This work was supported by the Joint Funds of the National Natural Science Foundation of China [Grant Number: 51974185; under Grant Number U1760109]. The authors acknowledge Instrumental Analysis & Research Center of Shanghai University.
- 1.Shi L, Chen R, Wang R (2011) Treatment and utilization of heavy metals sludge by cold-rolled stainless steel. Renew Resour Recycl Econ 4(6):33–36Google Scholar
- 2.Forsberg KM, Rasmuson AC (2007) Recycling of waste pickle acid by precipitation of metal fluoride hydrates. Miner Eng 312:2358–2362Google Scholar
- 4.Liu X, Zhang J, Xiao Q, Li Q (2014) Characterization of wastes generated during stainless steel production. Charact Miner Met 343–350Google Scholar
- 6.Ma G, Garbers-Craig AM (2006) A review on the characteristics, formation mechanisms and treatment processes of Cr (VI)-containing pyrometallurgical wastes. J South Afr Inst Min Metall 106:753–763Google Scholar
- 11.HJ/T301-2007, Technical specification for environmental protection of chromium residue pollutionGoogle Scholar