Abstract
As the fourth-largest industry waste residue, after iron slag, steel slag, and red mud, in China, the comprehensive utilization of nickel slag is imminent. Coal-based reduction combined with magnetic separation was considered an efficient method to extract iron from nickel slag. During the coal-based reduction of Jinchuan ferronickel slag, the growth characteristics and kinetics of metallic iron were investigated in this paper. The metallisation rate and metal iron grain size gradually increased with the reduction temperature or the reaction time, and the coal-based reduction process was divided into the rapid formation period and the aggregation growth period of the metallic phase. The granularity distribution of metallic iron obeyed the Doseresp sigmoidal function, and the activation energy of grain growth at different stages were 52.482 ± 4.448 kJ·mol−1 and 26.426 ± 3.295 kJ·mol−1, respectively. Meanwhile, a mathematical growth model of the metallic iron grains was also established.
Highlights
Since the economy and the smelting industry developed rapidly, the quantity of smelter slag has been increasing for a long time in China
The effects of coal-based reduction temperature and reduction time on the growth characteristic were ascertained via the characterisation of iron grain
When the reduction temperature was 1473 K, the metallisation rate increased rapidly from 18.47% to 61.23% as the reduction time was extended from 10 min to 40 min
Summary
Since the economy and the smelting industry developed rapidly, the quantity of smelter slag has been increasing for a long time in China. Metallic iron aggregates to iron particles in the coal-based reduction [16,17,18]. The coal-based reduction process and the growth behaviour of iron granules have been studied by several researchers. The coal-based reduction results were obtained using the optical image analysis to measure the metallic iron granularity of the reduction products [14,19]. The effects of coal-based reduction temperature and reduction time on the growth characteristic were ascertained via the characterisation of iron grain.
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