Metso’s Ausmelt TSL process provides a highly flexible, energy-efficient and environmentally friendly solution for the treatment of copper, nickel, lead, tin, zinc and precious metals bearing feedstocks.
High metal recoveries
Process flexibility & control
Substantial references globally
Operation
The Ausmelt top submerged lance (TSL) process has been applied across a range of smelting, converting, slag reduction and fuming applications at scales ranging from 200kg/h to more than 200 tph and is well suited to the recovery of base metals (Cu, Ni, Pb, Sn and Zn), critical minerals (Sb, In, Ge, Ga) and precious metals (Ag, Au, Pt, Pd).
The Ausmelt process utilizes a vertical lance through which oxygen enriched air and fuel are introduced to the bath. Unlike other bath smelting technologies, fuel injection via the Ausmalt lance enables independent bath temperature and oxygen potential (pO2) control and hence improvements in metal recoveries and product quality. The lance is also used to introduce post-combustion air and oxygen above the bath, resulting in heat recovery to the process and consequently, increased energy efficiency. Intense bath mixing and agitation arising from submerged lance operation provides for efficient mass and energy transfer.
Benefits
- Flexibility to process a wide range of feed materials including concentrates, residues, slags, dusts, sludges, e-waste
- Possibility for batch or continuous operation depending on capacity, target metal recovery efficiencies and integration with the overall plant flowsheet
- Precise control of operating temperature and bath oxygen potential for regulation of product composition and efficient removal of impurities
- High energy efficiency achieved through heat recovery to molten bath from the process off-gas
- Ability to handle significant variability in feed composition and physical characteristics
- Low dust generation rate (typically < 1% of feed input)
- Highly automated process control for enhanced safety
- Rapid ramp-up to full production
- Supported by digital solutions such as Metso’s Ausmelt TSL process advisor for enhanced operational control and performance
Check the video
Ausmelt TSL Furnace Technology
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