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3/21/2014 Types of iron and steel slag : NIPPON SLAG ASSOCIATION http://www.slg.jp/e/slag/kind.html 1/2 The iron and steel slag that is generated as a byproduct of iron and steel manufacturing processes can be broadly categorized into blast furnace slag and steelmaking slag Blast furnace Iron and steel slag refers to the type of metal manufacturing slag that is generated during the process of manufacturing iron and steel products. The term "slag" originally referred to slag produced by metal manufacturing processes, however it is now also used to describe slag that originates from molten waste material when trash and other substances are disposed of at an incinerator facility. Blast furnace slag Blast furnace slag is recovered by melting separation from blast furnaces that produce molten pig iron. It consists of non-ferrous components contained in the iron ore together with limestone as an auxiliary materials and ash from coke. Approximately 290 kg of slag is generated for each ton of pig iron. When it is ejected from a blast furnace, the slag is molten at a temperature of approximately 1,500℃. Depending on the cooling method used, it is classified either as air-cooled slag or granulated slag. Air-cooled slag The molten slag flows into a cooling yard, where it is cooled slowly by natural cooling and by spraying with water. This results in a crystalline, rock-like air-cooled slag. Granulated slag The molten slag is cooled rapidly by jets of pressurized water, resulting in a vitreous, granulated slag. Air-cooled slag Granulated slag Steelmaking slag This slag is a byproduct from steelmaking processes in which the components of pig iron and steel- scrap are modified in order to produce steel that is so highly valued for excellent toughness and workability. Steelmaking slag consists of converter slag that is generated by converter and electric arc furnace slag that is generated during the electric arc furnace steelmaking process that uses steel-scrap as the raw material. Converter slag In the same way as air-cooled blast furnace slag, converter slag is cooled slowly by natural cooling and water spray in a cooling yard. It is then processed and used for various iron and steel slag (converter) applications. Approximately 110 kg of slag is generated for each ton of converter steel. Related Searches: Adobe Flash Create PDF Adobe PDF Documents PDF Reader Acrobat 7 Acrobat Software Adobe Reader Download Adobe Free Adobe Reader Adobe PDF ? About this Ad

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  • 3/21/2014 Types of iron and steel slag : NIPPON SLAG ASSOCIATION

    http://www.slg.jp/e/slag/kind.html 1/2

    The iron and steel slag that is generated as a byproduct of iron and steel manufacturing processes

    can be broadly categorized into blast furnace slag and steelmaking slag

    Blast furnace

    Iron and steel slag refers to the type of metal manufacturing slag that is generated during the

    process of manufacturing iron and steel products. The term "slag" originally referred to slag

    produced by metal manufacturing processes, however it is now also used to describe slag that

    originates from molten waste material when trash and other substances are disposed of at an

    incinerator facility.

    Blast furnace slag

    Blast furnace slag is recovered by melting separation from blast furnaces that produce molten pig

    iron. It consists of non-ferrous components contained in the iron ore together with limestone as an

    auxiliary materials and ash from coke. Approximately 290 kg of slag is generated for each ton of pig

    iron. When it is ejected from a blast furnace, the slag is molten at a temperature of approximately

    1,500. Depending on the cooling method used, it is classified either as air-cooled slag or

    granulated slag.

    Air-cooled slag

    The molten slag flows into a cooling yard, where it is cooled slowly by natural cooling and by

    spraying with water. This results in a crystalline, rock-like air-cooled slag.

    Granulated slag

    The molten slag is cooled rapidly by jets of pressurized water, resulting in a vitreous, granulated

    slag.

    Air-cooled slag Granulated slag

    Steelmaking slag

    This slag is a byproduct from steelmaking processes in which the components of pig iron and steel-

    scrap are modified in order to produce steel that is so highly valued for excellent toughness and

    workability.

    Steelmaking slag consists of converter slag that is generated by converter and electric arc furnace

    slag that is generated during the electric arc furnace steelmaking process that uses steel-scrap as

    the raw material.

    Converter slag

    In the same way as air-cooled blast furnace slag, converter slag is cooled slowly by natural cooling

    and water spray in a cooling yard. It is then processed and used for various iron and steel slag

    (converter) applications. Approximately 110 kg of slag is generated for each ton of converter steel.

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    Create PDF

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  • 3/21/2014 Types of iron and steel slag : NIPPON SLAG ASSOCIATION

    http://www.slg.jp/e/slag/kind.html 2/2

    Electric arc furnace slag

    Electric arc furnace slag is generated when iron scrap is melted and refined. It consists of oxidizing

    slag that is generated during oxidation refining, and reducing slag that is generated during

    reduction refining. Approximately 70 kg of electric arc furnace oxidizing slag and 40 kg of reducing

    slag are generated for each ton of electric arc furnace steel.

    Converter Electric arc furnace Steelmaking slag (converter

    slag)

    Copyright (C) 2003 Nippon Slag Association All Rights Reserved.


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