Recovery of Iron, Chromium, and Nickel from Pickling Sludge Using Smelting Reduction

This paper reports the recoveries of iron, chromium, and nickel from pickling sludge using coal-based smelting reduction. The influences of slag basicity (CaO/SiO2, which is controlled by high phosphorus oolitic hematite iron ores), reduction temperature, reduction time, and the C/O mole ratio on th...

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Bibliographic Details
Published in:Metals (Basel ) 2018, Vol.8 (11), p.936
Main Authors: Tang, Zhaohui, Ding, Xueyong, Yan, Xinlin, Dong, Yue, Liu, Chenghong
Format: Article
Language:English
Subjects:
Basicity
Carbon
Chromium
Coal
coal-based
Hematite
high phosphorus oolitic hematite iron ore
Iron compounds
Iron ores
Metallurgy
Metals
Nickel
Phosphorus
Pickling
pickling sludge
Process parameters
Pyrometallurgy
Recycling
Scanning electron microscopy
Silicon dioxide
Slag
Sludge
Smelting reduction
Stainless steel
Steel production
Technical services
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Summary:This paper reports the recoveries of iron, chromium, and nickel from pickling sludge using coal-based smelting reduction. The influences of slag basicity (CaO/SiO2, which is controlled by high phosphorus oolitic hematite iron ores), reduction temperature, reduction time, and the C/O mole ratio on the recoveries of Fe, Cr, and Ni are investigated systematically. The experimental results show that high recoveries of Fe (98.91%), Cr (98.46%), and Ni (99.44%) are produced from pickling sludge with optimized parameters for the smelting reduction process. The optimized parameters are a slag basicity of 1.5; a reduction temperature of 1550 °C, a reduction time of 90 min, and a C/O mole ratio of 2.0. These parameters can be used as technical support for the recycling of pickling sludge with pyrometallurgy.
ISSN:2075-4701
2075-4701
DOI:10.3390/met8110936