Effect of Cooling Rate and Slag Modification on the Copper Matte in Smelting Slag

The amount of copper flash smelting slag has increased during the recent years along with an increasing slag-to-metal ratio. During slag tapping, some copper sulfide is mechanically entrained. As a result, it is necessary to recover copper matte from the slag by suitable methods. At present, the mos...

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Bibliographic Details
Published in:Minerals & metallurgical processing 2020-10, Vol.37 (5), p.1593-1601
Main Authors: Gao, Xiang, Chen, Zhuo, Shi, Junjie, Taskinen, Pekka, Jokilaakso, Ari
Format: Article
Language:English
Subjects:
Chemical composition
Cooling
Cooling effects
Cooling rate
Copper
Copper mattes
Copper sulfides
Engineering
Flash smelting
Gypsum
Image analysis
Materials Engineering
Metallic Materials
Metallurgy
Mineral Resources
Particle size
Photomicrographs
Slag
Smelting
Temperature
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Summary:The amount of copper flash smelting slag has increased during the recent years along with an increasing slag-to-metal ratio. During slag tapping, some copper sulfide is mechanically entrained. As a result, it is necessary to recover copper matte from the slag by suitable methods. At present, the most common way is slow, controlled cooling in a transfer ladle. However, research on the detailed effects of slow cooling and the function of slag modification is rare. This paper described experiments that were performed at different cooling rates (0.5, 1.5, 3, and 7 °C/min), with and without additive. A detailed characterization of the copper-rich phase and its particle size was subsequently made using SEM-EDS micrographs and image analysis software. With a decrease in cooling rate, the particle size of the copper-rich matte phase became larger. The addition of gypsum and carbon as a slag modifier affected the size of the copper-rich phase slightly, and its chemical composition was modified compared with the experiments without additive.
ISSN:2524-3462
2524-3470
DOI:10.1007/s42461-020-00274-x