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Gravity/buoyancy competition within coagulation of copper droplets in slag

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Wołczyński W. , Bydałek A. W.

Archives of Materials Science and Engineering

2015

tom Vol. 76, nr 1

35--45

Purpose: A suspension of copper droplets in the slag coming from the direct-to-blister process was subjected to the treatment analogous to that usually applied to the electric arcfurnace process. In particular, recently patented by authors, complex reagent was applied and verified. Design/methodology/approach: The suspension was subjected to coagulation and solidification. Both processes were studied, independently. The suspension of droplets was treated not only by the recently patented complex reagent but by the CaO – industrial compound (in the amount of 5 %wt.) as well, to make comparison between both substances effectiveness. Findings: The observation was focused on the behavior of droplets to conclude whether the droplets are settled on the crucible bottom due to the effect of gravity or pushed to the liquid slag’s surface due to buoyancy force influence. In the case of the patented reagent application, the coagulation mainly was completed by the droplets’ settlement on the crucible bottom. The treatment performed with the use of the CaO – compound promoted the influence of buoyancy force. The coagulated copper droplets were pushed to the liquid slag’s surface. Research limitations/implications: Rest reagents known in the industry practice will be subjected to the analogous analysis in order to make further comparison with the effect of the patented chemical. Practical implications: Conclusion from the performed experiment made in the crucible (laboratory scale) allow to suggest how to improve not only the semi- or fully industrial directto-blister technology but the treatment of the slag in the electric arc-furnace as well.