Incinerator bottom ash (IBA) is a form of ash produced in incineration facilities that does not fully combust, and discharges after incineration. This bottom ash often contains precious and heavy metals such as ferrous, aluminum, copper, stainless steel and zinc, which can be a challenge for disposal or reuse as construction aggregate. Sepro Urban Mining has developed a proprietary system for the wet processing of fine incinerator bottom ash (< 3mm or 1/8”) which provides various benefits to make it the best choice for IBA processing. 

Sepro Urban Mining’s Fine Slag Treatment Plant: Pioneering IBA Processing 

In today’s society of overconsumption and overproduction of short-lived, disposable items, increasing amounts of precious metals are found in fine IBA as a result of discarded electronics and jewelry. Sepro’s pioneering Fine Slag Treatment Plant (FSTP) module now adds a precious metals dimension, making selective recovery possible for valuable metals in fine particle sizes (0 – 2 mm). Fine incinerator bottom ash contains gold (0.3 – 1 ppm), silver (5 – 20 ppm), and platinum group metals (in minor amounts). Sepro’s FSTP can help an operation meet environmental targets by minimizing heavy metals/leachable contaminants in the rejected minerals, and provide other significant benefits that make it a strong choice for your IBA processing needs:

  • Cleaner final ash use for construction materials 
  • Easy integration into existing processes and small footprint requirements 
  • The ability to process either stockpiled or directly fed bottom ash 
  • Wet processing significantly reduces, if not eliminates, dust creation during processing 

How Sepro Makes Incinerator Bottom Ash Processing Easier 

Sepro’s FSTP features a pre-assembled compact and modular plant design

built to European or North American standards, with industry standard Falcon centrifugal concentrators optimised for IBA. The last stage of the fine metals recovery process results in  three separate concentrates that are produced and dewatered in bags. These high grade concentrates are then sold directly to smelters or further upgraded through subsequent cleaning. The reject stream is dewatered and can be landfilled or, depending on local regulations, used as construction aggregate. Other features of the FSTP include:

  • Possible adaptation to dry or wet IBA treatment plants
  • Fresh IBA and aged IBA can be treated by wet process
  • Low-intensity magnetic separator separates ferrous material 
  • Available in 1 t/h to 20 t/h fines capacity per module
  • 0 – 3 mm feed particle size
  • Full automation

Learn more about the process with our Fine Slag Treatment flow sheet.

If you are looking for the best way to recover fine metals from incinerator bottom ash, do not hesitate to contact us!