C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/14, 53/157, 2
C01B 17/90 (2006.01) C01B 17/96 (2006.01) C22B 3/22 (2006.01)
Patent
CA 2000312
ABSTRACT The invention relates to a process for the reworking of a dilute sulphuric acid solution which contains dissolved ferrous sulphate or a mixture of dissolved metal sulphates which are mainly ferrous sulphate. The sulphuric acid solution is concentrated to a content of up to 40% to 85% by weight H2SO4 (% related to the liquid portion), thereby resulting in the formation of a metal sulphate/sulphuric acid slurry. The precipitated metal sulphates are subsequently separated from this slurry. The purpose of the invention is to enable the separation of the metal sulphates in this process in a technically reli- able way using a membrane filter press. The content of free H2SO4 in the separated metal sulphates should be on the order of 10% by weight. As a solution to the problem it is suggested to separate the metal sulphates by pressure filtration in a membrane fil- ter press and to wash the resulting filter cake with a sul- phuric acid solution containing 30% to 35% by weight H2SO4. A device suitable therefore is described. The process is especially suitable for waste acids derived from titanium dioxide production, the sulphuric acid and the metal sulphates being advantageously returnable to the produc- tion process.
Kronos (usa) Inc.
Kronos Titan G.m.b.h.
Osler Hoskin & Harcourt Llp
Steinhausen Helmut
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