Investigation of effect of colemanite addition on copper losses in matte smelting slag

Rusen, A.
Geveci, Ahmet
Topkaya, Yavuz Ali
Derin, B.
In this study, the aim was to reduce copper losses to slag in copper production by using a boron compound, called colemanite (2CaO center dot 3B(2)O(3)center dot 5H(2)O), as flux, besides silica. In order to achieve this purpose, two different matte-slag couples were used; the flash furnace matte-slag obtained from Eti Copper Inc. (EBI.) and a master matte-slag without copper produced synthetically under laboratory conditions. Chemical analyses of flash furnace slag and synthetic master slag were 0.88%Cu-36.1%SiO2-43.9%FeO-3.7%Fe2O3 and 37.6%SiO2-60.0%FeO-2.4%Fe2O3 respectively. In each experiment, the same amounts of slag and matte were mixed with the addition of predefined amounts of colemanite and melted together at 1250 degrees C for different durations under nitrogen atmosphere in a silica crucible. Results showed that it was possible to decrease the copper losses to about 0.3-0.4% by accelerating the settling rate of matte particles by the addition of colemanite, which was attained by the expected increase in flash furnace slag fluidity and lowering of its liquidus temperature.
Citation Formats
A. Rusen, A. Geveci, Y. A. Topkaya, and B. Derin, “Investigation of effect of colemanite addition on copper losses in matte smelting slag,” pp. 157–169, 2012, Accessed: 00, 2020. [Online]. Available: