Method of recovering magnesia from scrap brick

Details Method of recovering magnesia from scrap brick Method of recovering magnesia from scrap brick

C - Chemistry, Metallurgy

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C01F 5/02 (2006.01) C01F 5/06 (2006.01) C01F 5/24 (2006.01) C22B 1/00 (2006.01) C22B 26/22 (2006.01)

Patent

CA 1079932

A B S T R A C T O F T H E D I S C L O S U R E A METHOD OF RECOVERING MAGNESIA FROM SCRAP BRICK Magnesia is recovered from scrap lining material rich in magnesia by leach treatment of the material with water in the presence of carbon dioxide under pressure, separating the leach- ing solution from solid leaching residues, precipitating out magnesium hydrocarbonates from the leaching solution and calcining the precipitate to form magnesia. To make the scrap lining material more readily leachable and enable the production of a rich leaching solution said lining material, prior to the leaching treatment, is treated with steam at a temperature with- in the range of 100 - 300°C and corresponding saturation pres- sures for a period of 1 - 50 hours.

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