Fertilizer material from apatite
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United States of America Patent
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-
Dec 14, 1982
Grant Date -
N/A
app pub date -
Apr 30, 1981
filing date -
Sep 7, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apatite is conventionally made into a fertilizer material by treatment with a strong acid, requiring capital-intensive industry. Hydroxyapatite is treated above 1100 C. with alkali but world reserves are problematic. The invention treats apatite at 900 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.
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