Method for the manufacture of soil modifiers from waste...

Details Method for the manufacture of soil modifiers from waste... Method for the manufacture of soil modifiers from waste...

C - Chemistry, Metallurgy

05

D

71/51

C05D 9/00 (2006.01) C01G 49/00 (2006.01)

Patent

CA 1040882

ABSTRACT OF THE DISCLOSURE Soil modifiers comprising from 80 to 95% by weight of a mixture of ferric oxide and ferric sulphate in an oxide/sulphate weight ratio of from 0.2:1 to 2:1 are prepared by calcining at 500-600°C in the presence of an oxidizing gas a material consisting essentially of ferrous sulphate with an average number of molecules of crystallization of from 1 to 5 obtained by partial dehy- dration of the waste materials, consisting essentially of ferrous sulphate heptahydrate, obtained in the manufac- ture of titanium dioxide from ilmenites or ilmenite slags by the sulphate process. These modifiers are particularly suitable for clay soils.

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