Method for magnesium sulfate recovery

Details Method for magnesium sulfate recovery Method for magnesium sulfate recovery

C - Chemistry, Metallurgy

01

F

23/102, 53/20

C01F 5/40 (2006.01) C22B 7/04 (2006.01) C22B 60/02 (2006.01)

Patent

CA 1239524

-13- Abstract of the Invention A method of obtaining magnesium sulfate substantially free from radioactive uranium from a slag containing the same and having a radioactivity level of at least about 7000 pCi/gm. The slag is ground to a particle size of about 200 microns or less. The ground slag is then contacted with a concentrated sulfuric acid under certain prescribed conditions to produce a liquid product and a solid product. The particulate solid product and a minor amount of the liquid is then treated to produce a solid residue consisting essentially of magnesium sulfate substantially free of uranium and having a residual radioactivity level of less than 1000 pCi/gm. In accordance with the preferred embodiment of the invention, a catalyst and an oxidizing agent are used during the initial acid treatment and a final solid residue has a radioactivity level of less than about 50 pCi/gm.

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