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

1977-03-08

1978-03-07

Hart, Charles N.

Chemistry: fertilizers

Processes and products

Inorganic material

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

Patent

active

040777944

ABSTRACT:
A soil modifier comprising from 80 to 95% by weight of a mixture of ferric oxide and ferric sulphate in an oxide/sulphate weight ratio of from 0.25:1 to 1:1, is prepared by calcining at 500.degree.-600.degree. C in an oxidizing atmosphere a blend of by-product obtained in the manufacture of titanium oxide by the sulphate process, with at least 20% by weight with respect to said by-product, of a material based on ferric sulphate and/or ferric oxide. Calcining is then continued under the same conditions, replacing said material in the blend continuously fed in by a recycle fraction of the product continuously discharged.

REFERENCES:
patent: 2741876 (1956-04-01), Paolini
patent: 2795495 (1957-06-01), Schmatloch et al.
patent: 3936292 (1976-02-01), Piccolo et al.
patent: 3974267 (1976-08-01), Urban, Jr.
patent: 4045205 (1977-08-01), Piccolo et al.

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