Incinerator bottom ash (IBA)

Recovering reusable materials from ash

Finding new use for metals and mineral waste products

After incineration, the incombustible components and the inert materials which are no longer reactive remain behind as ash. Metals, alternative building materials and minerals for building materials can be extracted from this ash. Separating out the metals is particularly important here, as they represent a valuable resource. In addition, the mineral content of the ash may not contain any heavy metals if it is to be used as an alternative building material.

BHS offers innovative mixing and shredding technologies for the handling of raw ash and the fine processing of recyclable materials. They are available as both stand-alone solutions and as turnkey systems. Our solution portfolio is based on our years of experience with impact crushing, separation technology and the combining of different power units. You benefit from greater efficiency in breaking up the agglomerated materials and in the subsequent refining. Our goal is to deliver maximum yields.

Benefits at a glance:

  • Selective material separation
  • Customer-specific machine configuration
  • Turnkey system planning
  • Yields high amount of non-ferrous metals suitable for smelting
  • High purity level


Keeping the environment and costs in your sights


Keeping the environment and costs in your sights

Ash from waste incineration plants is becoming an increasingly valuable resource. Demand for metals is growing worldwide, while at the same time regulations on waste disposal are becoming stricter and landfill costs are rising. In addition, the minerals primarily contained in the ash are used in road construction across most of Europe. In this way, recycling boosts the supply of raw materials while also resulting in lower costs and less use of landfill space. 

The right solution for every input material


The right solution for every input material

Each batch of incinerator bottom ash (IBA) is made up of a unique combination of materials. A number of different machines from BHS are used to finely process the ash. The maximum particle size, the desired target size and the required throughput rate all factor in when selecting and configuring the machines. After the material has been processed, it can be separated and refined according to the customer’s requirements.

You can rely on our extensive experience and process know-how. Working together with our customers, we carry out extensive testing on the input material at our modern test center in order to develop a process and system design that best meet their needs. The systems feature a modular design, providing flexibility for modifications and upgrades. Parts of the process can be carried out separately as a standalone solution.

BHS offers tailor-made mixing modules for the stabilization of ash. What sets the BHS single-shaft continuous mixer (MFKG) apart here is the self-cleaning rubber trough, which prevents material build-up on the inner trough wall. This allows you to reduce downtime and achieve maximum efficiency.


Rotorshredder (RS)

Crushing, separation and disaggregation – the rotor shredder can do it all

Impact crusher & impact mill (PB & PM)

Low operating costs coupled with superior crushing performance

Rotor centrifugal crusher (RSMX)

High-performance crushers for hard or abrasive recycling materials

Rotor impact mill (RPMV & RPMX)

Ball shaper operating based on unique crushing principle

Twin-shaft continuous mixer (LFK)

High-performance solution for continuous operation



Brochure of the "Recycling Technology" business unit
"Fine treatment for optimal metal recovery" application flyer

Tests give certainty

Which technical solution is the right one for your recycling process? Don’t leave anything to chance. Our team of specialists will test your material at our test center and develop a solution tailored to your specific needs.


Pollutec 2023

10-10-2023 - 10-13-2023
With RESSOR on booth H3-E100 (hall 3)

IFAT India 2023

10-17-2023 - 10-19-2023
Bombay Exhibition Centre, booth F021f (German Pavillon)

Vakbeurs Recycling 2023

11-21-2023 - 11-23-2023
Booth Nr. C118 together with "Scratch Recycling Solutions"

IFAT 2024

5-13-2024 - 5-17-2024

Success stories

Plant for recycling automotive shredder residues (ASR) in Finland.

July 2017
Kajaanin Romu Oy operates one of Finland’s most cutting-edge plants for recycling scrap in the town of Kajaani, located approximately 500 km northeast of Helsinki. The company commissioned a BHS-Sonthofen plant for processing automotive shredder residue (ASR) fine fractions of particle sizes between 0 and 30 mm. It separates the feed material abundant with valuable metals into ‘light’ and ‘heavy’ fractions in a single pass. This allows the plant operators to economically produce fractions that can be sold profitably. Moreover, the plant significantly reduces the cost of material disposal at landfills.

DHZ AG – Extracting concentrated metals from incinerator bottom ash

July 2016
DHZ AG operates a modern recycling center in Lufingen in the Swiss canton of Zurich. The facility focuses on processing incinerator bottom ash (IBA). BHS-Sonthofen supplemented two existing IBA processing plants with an additional plant that extracts high-quality, heavy and light non-ferrous metal fractions from the coarse concentrate generated upstream. These are of such high quality that they can be sold directly to smelters or to industrial customers.

Technical articles in the media

Customized recovery | Recovery of metallic fines from ASR

February 2023
The recovery of metallic fines from ASR requires a customized approach. Auto shredder residue (ASR), fines from shredded electrical and electronic equipment and waste incinerator bottom ash all have one thing in common: They contain valuable metals that are worth recovering. Therefore, processing these fine materials is of high importance.
recycling today, scrap recycling | Winter 2023 | Supplement to recycling today

Recuperación de metales valiosos: alto rendimiento para un procesamiento fino mejorado

August 2022
BHS optimiza la calidad de su molino de impacto de rotor con un nuevo diseno de martillo. AMBISORT Circular ofrece siempre procesos novedosos y de alto valor añadido para el sector del reciclaje. Un destacado ejemplo es la recuperación de valiosos concentrados de metales a partir de varios composites y desechos industriales, que sin duda es todo un desafío técnico.
RETEMA, 07/08-2022

BHS fine treatment process recovers valuable metals from residual materials

July 2022
There is currently no way around the issue of resource saving but how can valuable materials can be recycled in the best possible way? Metals in particular are considered important scarce raw materials whose recovery is essential for the sustainable use of resources. BHS-Sonthofen offers an effective solution for metalliferous residues with a size of up to 25 mm.
recovery, 04|2022

Recycling company in United Kingdom processes ASR fractions and electronic scrap using the BHS Rotorshredder

February 2022
British recycling specialists Recycling Lives commissioned a recycling plant that was planned and implemented by BHS-Sonthofen. The plant is designed to handle a variety of materials such as automotive shredder residue (ASR), electric and electronic scrap (WEEE), as well as so-called "meatballs" (electric motors and motor armatures). The process developed together with the company is based on a profitablity analysis and ensures marketable end products.

Satisfied customers worldwide


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Find your personal contact person on site. We are there for you worldwide.