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Posco pursues eco-friendly business with steel byproduct slag

Steel News - Published on Tue, 23 Apr 2019

Image Source: POSCO Newsroom
Korea Herald reported that Posco, citing its application of slag and gases to the company’s conservation projects and businesses, said that steelmaking itself is not environment-friendly, but its byproducts can be. Posco said “Slag, if the lime is separated, can be used as a fertilizer to improve the production of rice around 10-15% while preventing soil acidification and generating less methane. Slag can also be recycled when used in cement and concrete production. Posco has developed eco-friendly slag cement that has a high level of chloride invasion resistance and reduces hydration heat. The product, named PosMent, is appropriate for offshore concrete and was jointly developed by construction arm Posco Engineering & Construction and the Research Institute of Industrial Science and Technology.”

By using a total of 10.69 million tonnes of slag for PosMent production, Posco estimates it has reduced 8.39 million tonnes of carbon dioxide when compared to greenhouse gases produced in the making of regular cement.

Posco developed Triton, an artificial reef produced by steel slag, to create a healthy environment for marine life. Last year, the company supplied 1,418 units of Triton for marine forest projects executed by the government and municipalities.

On average, in the process of making 1 tonne of steel around 600-700 kilograms of byproduct is produced, mostly slag. Slag, a mixture of silica and calcium, magnesium and iron oxides, can be used for the conservation of marine ecosystems, as its rich mineral components can accelerate the growth of marine plants and purify polluted water.

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Posted By : Sanju Moirangthem on Tue, 23 Apr 2019
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