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2 Polish Journal of Chemical Technology

2 2001

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The analysis of possibility of sulphuric acid recycling in sulphate technology of titanium dioxide production

100%

Przepiera A. , Przepiera K.

Polish Journal of Chemical Technology

2001

tom Vol. 3, nr 4

29-33

Titanium dioxide sulphate technology generates large amount of waste sulphuric acid and hydrated iron (II) sulphate (copperas). This paper shows the possibility of recycling spent sulphuric acid in titanium dioxide production after its two stage of evaporation under reduced pressure with the inter stage separation of precipitated salts in order to remove transition metals salts consisting of the contamination of the spent sulphuric acid. The discussed process has been tested in the industrial conditions. The described process saves principal conditions for sulphuric acid recycling in titanium dioxide sulphate technology.

Utilization of waste iron (II) sulphate from titanium dioxide production for preparation of precipitated iron oxides

67%

Przepiera K. , Przepiera A.

Polish Journal of Chemical Technology

2001

tom Vol. 3, nr 2

20-25

Titanium dioxide is mainly used as an excellent white pigment. A serious disadvantage of titanium dioxide production using sulphate route process is a large amount of wastes being formed during titania raw material processing. These wastes form iron (II) sulphate heptahydrate, FeSO47H2O and spent solution of sulphuric acid. This work shows the method enabling the utilization of waste iron (II) sulphate originated from the titanium dioxide production by using it for the preparation of precipitated iron oxides. Precipitated iron oxides can be used as a raw material for preparing ferric coagulating agents like aqueous solution of iron (III) sulphate and iron (III) chloride. They may also be used for iron oxides pigments preparation which can be applied in building materials industry.