Residue treatment
Grate for Riddlings
grate_for_riddlings_infographic_new
Introduction

Up to 70% of recoverable nonferrous and precious metals in incinerator bottom ash (IBA) are concentrated in the fine fraction. Unlocking this fine fraction is critical to maximising recovery value from Waste to Energy (WtE) operations.

The Kanadevia Inova Grate for Riddlings (GfR), integrated within the X2conmat™ process, is specifically designed to capture this opportunity.

By upgrading conventional wet-discharge systems, the Grate for Riddlings (GfR) enables the extraction of valuable dry fine material (0–10 mm) directly on the grate, increasing nonferrous recovery and improving downstream separation efficiency.

Retrofit solutions are available for Kanadevia Inova grates as well as selected third-party installations.

Description

The GfR enhances metal recovery by incorporating a screening grate element with defined slit widths into the final combustion zone. This enables the fine IBA fraction, representing approximately 40 wt% of the total IBA, to be separated and discharged in a dry state before water contact. 

Separation efficiency is supported by the mechanical sieving movement of the grate, combined with specially designed deflectors that promote effective fine material extraction. The separated dry fraction is discharged in a dust-tight mechanism for further processing. The remaining coarse fraction is discharged via the conventional wet extraction method.

By removing the fine fraction prior to quenching, the GfR increases both the quantity and quality of the recovered nonferrous metals. Reduced residual metal content and lower moisture content in the remaining ash also contribute to lower transport costs and potential disposal costs.

Grate for Riddlings
Features and advantages

  • Improved metal quality through dry extraction

  • Increased recovery of nonferrous and precious metals  

  • Fully enclosed system with controlled dust management

  • Reduced transport volumes and potential disposal costs

  • Reduced water consumption thanks to air cooling of the fine fraction

  • Environmental benefits support the circular economy

  • Enhanced material recovery reduces carbon impact

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Further related technologies

Grate Combustion systems

The combustion system is the best-proven thermal waste treatment technology for mixed municipal, industrial or hazardous waste, and the heart of any modern, state-of-the-art Waste to Energy (WtE) plant.

Flue gas treatment

Incinerating waste produces exhaust gases laden with diverse pollutants. Different processes are used to remove these pollutants before the purified flue gas leaves the plant safely through the stack.

Carbon capture

Capturing carbon dioxide (CO₂) from the flue gas produced in hard-to-abate industries and properly storing it (a process called carbon capture and storage or CCS) is a key component of most governments’ net-zero strategies.

Energy recovery

Recovering the energy content of waste is a key component of WtE technology. Since the process is largely renewable and involves only a low level of emissions, it also helps significantly reduce greenhouse gases.

Residue treatment

Thermal waste treatment produces residues which can be either reused or landfilled. The principal components are slags and ashes, consisting mostly of non-combustible waste constituents such as glass, minerals or scrap metals.

EcoFlex™ WtE plant solution

The new pre-engineered EcoFlex™ solution provides a modern waste infrastructure based on proven in-house technologies, allowing a cost-optimised design of single-line Waste to Energy plant construction and operation.