Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ivb metal
Patent
1990-07-05
1995-04-25
Bos, Steven
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ivb metal
4232421, 423522, 423610, 423615, 423616, 423530, 423 83, 423DIG2, C01G 2302, C01G 2304, C01B 1700, C01B 1769
Patent
active
054096790
ABSTRACT:
The production of titanium dioxide by the sulphate process generates waste substances such as the wash filtrates, which are formed in the washing of titanium dioxide hydrate, and waste gases which contain sulphur dioxide. In this improved process the wash filtrate is used to remove the sulphur dioxide from the waste gas while the sulphuric acid content of the wash filtrate is raised and the sulphuric acid-containing process solution thus obtained is used within the scope of the titanium dioxide production process. The waste gas and the wash filtrate are passed countercurrently through a series of several washing steps and are contacted with each other by introducing the wash liquid into the waste gas in a finely divided form in scrub towers. The sulphuric acid content of the washing fluid is stepwise changed from washing stage to washing stage. The sulphur dioxide content of the waste gas is reduced to values that may be discharged into the ambient atmosphere. The sulphuric acid-containing process solution is returned to the digestion tank and/or used for dissolving the digestion cake.
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Bos Steven
Cronin Michael J.
Kronos Inc.
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