Fertilizer material from apatite

Details Fertilizer material from apatite Fertilizer material from apatite

1982-07-30

1984-03-13

Lander, Ferris H.

Chemistry: fertilizers

Processes and products

Inorganic material

71 45, 71 47, 71 51, 71 53, C05B 1300

Patent

active

044365462

ABSTRACT:
Apatite is conventionally made into a fertilizer material by treatment with a strong acid, requiring capital-intensive industry. Hydroxyapatite is treated above 1100.degree. C. with alkali but world reserves are problematic. The invention treats apatite at 900.degree. C. with sodium aluminosilicate/carbonate and siliceous material in quantities to keep the composition in terms of CaO, SiO.sub.2, Na.sub.2 O and P.sub.2 O.sub.5 in or near the ternary system Ca.sub.2 SiO.sub.4 --Ca.sub.3 (PO.sub.4).sub.2 --CaNaPO.sub.4.

REFERENCES:
patent: 1799882 (1931-04-01), Brenek
patent: 2916372 (1959-12-01), Schytil
patent: 3552944 (1971-01-01), Hauschild et al.
patent: 4106922 (1978-08-01), Hauschild et al.

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