Method of manufacturing calcium phosphate using phosphorus in plants

Abstract

A method of manufacturing calcium phosphate using phosphorus in plants. The method comprising the steps of firstly slurrying raw material containing phosphorus, including plants particularly such as soybean, corn, oil meal of the rice bran and the like; adding one or more selected among oxide, hydroxide and carbonate of calcium to the slurry and mixing them; controlling Mg component derived from the raw material so that the Mg/Ca mole ratio is in the range of 0.25 or less; dehydrating and drying them; controlling pH of the slurry and 7.5 or higher and slowly heating them within the temperature range from 150.degree. C. to 650.degree. C. in the oxidation atmosphere to dissipate and remove carbon; and finally raising the temperature to burn them within the temperature range from 700.degree. C. to 1550.degree. C. in the oxidation atmosphere.

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