Method for the manufacture of soil modifiers from waste material

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

1976-07-07

1977-08-30

Spear, Jr., Frank A.

Chemistry: fertilizers

Processes and products

Inorganic material

71 40, 71 63, 71 64SC, 423548, 423632, C05D 900

Patent

active

040452050

ABSTRACT:
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.degree.-600.degree. 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 dehydration of the waste materials, consisting essentially of ferrous sulphate heptahydrate, obtained in the manufacture of titanium dioxide from ilmenites or ilmenite slags by the sulphate process. These modifiers are particularly suitable for clay soils.

REFERENCES:
patent: 3936292 (1976-02-01), Piccolo et al.
patent: 3974267 (1976-08-01), Urban, Jr.

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