Metal producers are facing a decline in sulfide ore grades, with most of the world’s prime deposits already depleted. As a result, less valuable metal content is available in the feed and the trend towards finer feed materials mean production costs are increasing. As metal content in the feed reduces, higher impurity levels are to be expected, which cause stickiness issues (e.g. Pb) and an increased need for more complex gas cleaning solutions (e.g. As, Hg).
Advanced technology for superior efficiency
Metso's Next Generation Fluid Bed Roaster is a reactor with improved individual components to enable more efficient and stable roasting plant performance, including:
- Dual feedstock: feed pretreatment system (FPS) & conventional feed system
- Roaster feed system: roaster table feeder (RTF), slinger belt feeder (SBF) & feed gate valve (FGV)
- Cooling coils
- Underflow discharge device
- Freeboard cooling
- Digitalization: roaster optimizer & oven monitoring
Plant benefits
- Improved safety: reduced personnel at workface
- High feed rates, efficient heat recovery, and other improved process parameters
- Improved plant availability in the roasting area and hence availability of downstream plant sections
- Process control enhancement
- Reduced operating costs
Key features
- Enables operation with finer materials and also residuals
- Adaptation of feed system depending on feed material characteristics
- Significantly reduced spillage at roaster feeding system
- Improved gas tight production
- Minimized operational interruptions
- Improved operations via a merger of digital solutions, focused measurement and equipment development
- Extended equipment lifetime
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