Dust treatment

The following products are moistened and partially granulated in the AVA system:

• Foundry dust
• Sinter dust
• Electric furnace dust
• Blast-furnace dust
• Converter dust
• Furnace burdening dust
• Cupola furnace dust
• ... As well as numerous other types of dust.

In addition, in some cases dusts of > 400º C can be cooled by means of adding water and can be treated until dust free. Any vapours created can be fed via AVA-spezifische Brüdensysteme , while the sludge of the product is reintroduced. (» AVA-Delivery program: Filer systems)

Special compacting process for achieving stable granules enables, for example, sinter dust to be introduced directly back into the steel melt.  

Sludge processing

Sludge is created in various areas of steel manufacture and processing which contain numerous recyclable materials. In the AVA system, this sludge is dried in order to enable further processing, or alternatively e.g. oil is vaporised out of the mill scale sludge and thereby reclaimed. AVA has expertise in all of the processing technologies and can fall back on the experience of numerous supplied plants. This experience then serves to facilitate the user-oriented planning of new systems.

Sinter mixing

In the past, rotating drum mixers were often used for mixing various substances with returns, limestone, quartz and coke.

AVA has developed a mixer especially for this purpose which achieves higher production economy and availability.

The primary advantages for the customer include:

• Considerably lower space requirements
• End product improvement by means of a paddle mixing system
• Short detention times
• Possibility to add water
• No caking of the agitator, even in the event of over-moistening of the product
• Simple maintenance
• Quick exchange of wearing parts
• High throughput performance up to 2,000 t/h per mixer
• Special drum lining for increased durability
• Drive of agitator via hydraulic systems, and therefore high flexibility in speed control.

As experts for ash and dust conditioning our mixing technology contributes to avoid those pictures in future!