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Scientists produce high-strength plaster entirely from waste

About 5 tons of phosphogypsum is generated per ton of phosphoric acid production, and worldwide, phosphogypsum generation is estimated to be around 100 to 280 MT per year. Globally, 15 percent is recycled as building materials, agricultural fertilizers or soil stabilization amendments and as setting controller in the manufacture of Portland cement. The rest is stored near factories, which not only has a large footprint, but also causes serious environmental contamination.  "We have had inquiries from industry, who were interested in managing their waste products, and this was the primarily impulse for our research. All the materials used in our invention are waste products from different industries. After combining zeolite, which is coming from an oil refining company, and phosphogypsum from fertilizer producer we added a certain activator, which changed the micro structure and significantly increased the strength of the final product—plaster stone," says Aras Kantautas, researcher at KTU Faculty of Chemical Technology, one of the researchers.  Read more...



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