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氧气底吹炼铜机理.pdf
Trans. Nonferrous Met. Soc. China 27(2017) 946−953
Copper smelting mechanism in oxygen bottom-blown furnace
Qin-meng WANG, Xue-yi GUO, Qing-hua TIAN
School of Metallurgy and Environment, Central South University, Changsha 410083, China
Received 22 July 2016; accepted 23 February 2017
Abstract: The SKS furnace is a horizontal cylindrical reactor similar to a Noranda furnace, however, the oxygen enriched air is
blown into the furnace from the bottom. Mechanism model of the SKS process was developed by analyzing the smelting
characteristics deeply. In our model, the furnace section from top to bottom is divided into seven functional layers, i.e., gas layer,
mineral decomposition transitioning layer, slag layer, slag formation transitioning layer, matte formation transitioning layer, weak
oxidizing layer and strong oxidizing layer. The furnace along the length direction is divided into three functional regions, that is,
reaction region, separation transitioning region and liquid phase separation and settling region. These layers or regions play different
roles in the model in describing the mechanism of the smelting process. The SKS smelting is at a multiphase non-steady equilibrium
state, and the oxygen and sulfur potentials change gradually in the length and cross directions. The smelting capacity of the SKS
process could be raised through reasonably controlling the potential values in different layers and regions.
Key words: oxygen bottom-blown copper smelting; mechanism; multiphase equilibrium; oxygen potential; sulfur potential; SKS
process
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