Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Peik Ekman0
Elina Lappalainen0
Kenneth Ekman0
Date of Patent
February 22, 2022
0Patent Application Number
171262540
Date Filed
December 18, 2020
0Patent Citations Received
0
Patent Primary Examiner
Patent abstract
A novel process for treating pickling acid residue and recovering sulfates and nickel therefrom has been developed. By lowering the pH of a magnesium compound slurry to 4-5.5 with sulfuric acid containing pickling acid residue in the presence of ammonium sulfate, both magnesium sulfate and nickel sulfate are solubilized. Magnesium sulfate and nickel sulfate solution is separated from the solids by filtration and an iron hydroxide and chromium hydroxide residue is obtained as a precipitate. Magnesium sulfate and nickel sulfate are then separated from the solution.
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