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Slag a Key ingredient in Green Concrete

Metal News - Published on Fri, 20 Sep 2019

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With its three DEMAG furnaces the most powerful in the world SLN produces an average of 55,000 tonnes of ferronickel, as well as 1.8 million tonnes of slag made mostly out of silica and magnesium. Though it is infrequently used, this co-product holds some real technical and economic advantages, starting with its eco-friendly nature. Traditionally, this slag is used as fill material for the construction of offshore extensions. A large portion of the city of Noumea, including Magenta Airport and the Doniambo plant, rely on this slag, which is used in its untreated form.

At a time when only 10% of slag output is sold on the local market, SLN is looking for new applications for this material. Mr Yves Veran, Project Manager for Slag Recycling said that "For ten years, we’ve been working on various solutions to structure the product, and to accomplish this, we recently appointed some dedicated senior project managers.”

One possibility that has been closely examined is to use slag as a replacement for natural sand, one of the usual ingredients in concrete. SLN asked several specialized universities in Australia, as well the Centre d’Etudes et de Recherches de l’Industrie du Beton in France, to conduct studies on this application. The results have been conclusive: replacing 70% of natural sand with slag leads to an equivalent or superior level of quality in the concrete.

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Posted By : Rabi Wangkhem on Fri, 20 Sep 2019
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