Title

EAF SLAG RECOVERY TURNS A WASTE DISPOSAL PROBLEM INTO A BUSINESS OPPORTUNITY

EAF SLAG RECOVERY TURNS A WASTE DISPOSAL PROBLEM INTO A BUSINESS OPPORTUNITY

Authorship

Zimolo, Dario; Tomadin, Luciano

Zimolo, Dario

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Tomadin, Luciano

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DOI

10.5151/2594-5300-22792

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Abstract

The melting of steel scrap with the EAF (Electric Arc Furnace) produces metallurgical slag amounting from 12% to approximately 20% of the steel, thus the production of this by-product is very important and the traditional on-site piling method is not a solution any more. Danieli has developed the Ecogravel® Process, the slag recovery system which produces various sizes of aggregate having mechanical properties better than those of natural aggregate. The system is able to magnetically separate ferrous materials from the EAF slag, the recovered scrap metal is approximately 3%-4%. The process is completely automated and its operation requires personnel only for feeding the processing line and removing the end products. Danieli is flexible in designing a process which takes into consideration the specific requirements of each project. The phases of the process are crushing, grinding, screening and magnetic separation, by special equipment. The process recovery rate is 100%, because no waste or other by-product is generated. The main product is Ecogravel®, a fantastic industrial aggregate, but the recovered metal scrap is economically even more important. Depending on the EAF operations and slag pre-treatment, up to 3%-4% of the slag is recovered as scrap. The markets for aggregate product is bituminous conglomerate for road pavements and in the concrete like aggregate for industrial and civil application. The return of the investment could be less than 1 year, depend from the disposal costs of the slag. Ecogravel® Process is very attractive, in fact it can turn a bulky environmental problem into a business opportunity.

The melting of steel scrap with the EAF (Electric Arc Furnace) produces metallurgical slag amounting from 12% to approximately 20% of the steel, thus the production of this by-product is very important and the traditional on-site piling method is not a solution any more. Danieli has developed the Ecogravel® Process, the slag recovery system which produces various sizes of aggregate having mechanical properties better than those of natural aggregate. The system is able to magnetically separate ferrous materials from the EAF slag, the recovered scrap metal is approximately 3%-4%. The process is completely automated and its operation requires personnel only for feeding the processing line and removing the end products. Danieli is flexible in designing a process which takes into consideration the specific requirements of each project. The phases of the process are crushing, grinding, screening and magnetic separation, by special equipment. The process recovery rate is 100%, because no waste or other by-product is generated. The main product is Ecogravel®, a fantastic industrial aggregate, but the recovered metal scrap is economically even more important. Depending on the EAF operations and slag pre-treatment, up to 3%-4% of the slag is recovered as scrap. The markets for aggregate product is bituminous conglomerate for road pavements and in the concrete like aggregate for industrial and civil application. The return of the investment could be less than 1 year, depend from the disposal costs of the slag. Ecogravel® Process is very attractive, in fact it can turn a bulky environmental problem into a business opportunity.

Keywords

Steel slag; Recycling and utilization; Asphalt mixture; Concrete.

Steel slag; Recycling and utilization; Asphalt mixture; Concrete.