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1 Polish Journal of Chemical Technology

1 2001

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Reduction of environmental pollution by improvement of sulphate technology of titanium dioxide production

Jabłoński M., Przepiera A.

Polish Journal of Chemical Technology

2001

Vol. 3, nr 3

1-2

In the sulphate technology of titanium dioxide production titania raw materials as titania slag or ilmenite are digested by the reaction with concentrated sulphuric acid. This batch process occurs at high temperature and leads to intensive emission of water vapour, sulphuric acid and sulphur dioxide. Large fluctuations of the stream of emitted gases are the reasons of difficulties with the reduction of sulphur dioxide emission in this technology. The forming and emission of sulphur dioxide is a result of reducing properties of titania slag containing titanium (III) oxide. The high temperature of the reaction and reducing the proprieties of titanium slag are the reasons of high emission of sulphur dioxide. A much lower emission of sulphur dioxide occurs in the reaction of ilmenite with sulphuric acid, however, a smaller content of titania in this material needs greater quantity of feedstock in comparison to titanium slag. This paper shows the possibility of reducing the emission of sulphur dioxide by the digestion of the mixture of titania slag and ilmenite.