Process improvements for fluidized bed zinc roasting – An integrated learning strategy

Preis inkl. MwSt., zzgl. Versand

David Pletinckx, Ruben Boeree, Koen Michielsen, Marcus Fox

The economics of newly developed flowsheets for zinc and zinc-lead smelters have created two main challenges for zinc roasting. As the smelters developed their need for high value concentrate feeds, the metal mines have adapted their way of working to newly developed technologies in grinding and flotation. The trend for zinc concentrates to become finer will have a significant influence on the fluidized bed roaster operation. Secondly, some larger high quality, low iron zinc mines are closing their operations in this decade, for example MMG’s Century and Vendanta’s Lisheen in 2015. Newly developed concentrates are keen to be more challenging, directing more impurities to the smelters and the roasting furnaces. In order to meet the described challenges, a structural approach was needed, much more decisive than basic technical networking and occasional problem solving. This article describes the strategy of Nyrstar’s Metal Processing Segment towards knowledge development across the different smelters at different sides of the world. Two facts were contributing to this necessity: the global transformation of the Nyrstar’s smelters and the fact that two smelters were operating almost exclusively on the Century zinc concentrate, with the latter to disappear end 2015. For these two smelters, projects have been implemented in the course of 2015 enabling the treatment of concentrates containing increased cadmium and iron volumes, following the introduction of a more complex feedbook after the closure of the Century mine. To prepare for the end of the Century concentrate, this approach of knowledge sharing was used to develop extensive test work and process modifications at the Nyrstar Hobart (Australia) and Nyrstar Budel (The Netherlands) zinc smelters. The development of a technical network group for learning, research, testing and linked industrial test campaigns has proven to be of great value for developing and understanding the control mechanisms of fluidized bed roasting, especially separating and linking the physical/chemical properties of the roaster feed to the physical and chemical aspects of roasting process control.

Diese Kategorie durchsuchen: Zinc