Slag Utilisation

The properties of solidified iron and steel slag depend on a combination of factors. The source and types of inputs used in the melting or refining process are important, but so are the systems used for handling and cooling. MultiServ has developed techniques to help optimise the management of slag generated from a wide range of meltshop arrangements. These techniques are designed to work safely, reliably and minimise environmental impact by maximising the recovery of materials for re-use.

Laying of slag-based asphalt for road construction in the UK.

Slag being used as a water filtration medium in New Zealand. The material has been proven to remove high levels of phosphorous and suspended solids.

BOS slag asphalt used on the van Reenan's Pass in South Africa. The material was specified to resist binder stripping and deformation.

SteelPave material in use on a road carrying in excess of 6,500 commercial vehicles per day. This road surface was supplied in the UK under the Highways Authority Product Approval Scheme (HAPAS).

Steel slag is particularly suitable for use as a road construction material. It has a high crushing strength and cubical shape which create strong interlocking structures exhibiting excellent resistance to deformation. Slag-based asphalt creates a very durable product due to its natural affinity to bitumen and properties that give good skid resistance over many years.

Our dedicated laboratory facilities have designed steel slag asphalt blends that meet standards for road construction applications all over the world. To ensure slag aggregates perform reliably our test facilities develop procedures and quality assurance systems.

Asphalt stored in silos ready for delivery to local road surfacing contractors.

Skid tests are conducted as part of an on-going research programme into the long-term performance of steel slag based asphalts.

Slag is tested to ensure compliance with national specifications.

Empirical testing of steel slag asphalt mixtures.

Processed slag is also sold to the cement, fertiliser, water treatment, construction and insulation industries. At integrated steelworks some of the iron and lime values in the steel slag can be recovered by recycling processed steel slag fines in the sinter mix.

MultiServ can provide a system for injecting de-metallised ladle slag into the slag layer in electric arc furnaces. Using ladle slag this way can improve refractory life and reduce lime consumption.