Method for re-using waste sulphuric acid

Details Method for re-using waste sulphuric acid Method for re-using waste sulphuric acid

C - Chemistry, Metallurgy

01

G

23/116, 23/261

C01G 23/053 (2006.01) C01B 17/88 (2006.01) C01B 17/90 (2006.01) C22B 34/12 (2006.01)

Patent

CA 2014001

Abstract The approximately 23% waste sulphuric acid resulting from the digestion of raw titanium material is concentrated (CS) to approximately 70% by weight and completely, or at least for the most part, roasted (R) with the precipitated metal salts. whereas the metal oxides (MeO) resulting from the roasting are conveyed to a waste dump, the sulphur oxide gases which are produced are converted, with the addition of water, to highly concentrated, e.g. 98%, sulphuric acid (HCS), which is returned to the raw titanium material digestion process. As the proportion of recycled metal compounds is greatly reduced during recirculation, a titanium dioxide pigment of a better quality can be produced with little expenditure in terms of equipment and energy.

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