C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
23/261
C01G 23/053 (2006.01) C01G 23/00 (2006.01) C22B 3/26 (2006.01) C22B 34/12 (2006.01)
Patent
CA 2035085
ABSTRACT The invention is concerned with a process for producing titanium dioxide which discharges no waste. In a first step of the process according to the invention, a sulfuric acid solution containing titanium ion together with one or more kinds of metal ions is brought into contact with a first organic solvent to extract the titanium ion as a sulfuric acid complex from the sulfuric acid solution, and the organic solvent contain- ing the extracted titanium in a form of a sulfuric acid complex (titanyl sulfate) is brought into contact with an aqueous liquid to strip the titanium in a form of sulfuric acid complex into the aqueous liquid and to regenerate the first organic solvent for recycling for extraction. In a second step, the aqueous liquid contain- ing the titanium in a form of sulfuric acid complex stripped from the organic solvent is subjected to a hydrolysis to form insoluble titanium hydroxide, and the titanium hydroxide is washed with dilute sulfuric acid and or clear water. In a third step, a part or whole of raffinate of extraction in the first step is brought into contact with a second organic solvent to extract the titanium ion as a sulfuric acid complex from the raffinate, and the organic solvent containing extracted titanium in a form of sulfuric acid complex is brought into contact with water, dilute sulfuric acid solution or a dilute titanyl sulfate solution to strip the tita- nium in a form of sulfuric acid complex to regenerate the organic solvent for recycling to extraction.
Solex Research Corporation Of Japan
Swabey Ogilvy Renault
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