Calcium phosphate from hatchery by-product
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United States of America Patent
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Oct 28, 2003
Grant Date -
Oct 9, 2003
app pub date -
Apr 5, 2002
filing date -
Apr 5, 2002
priority date (Note) -
Expired
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Abstract
A method of preparing particulate calcium phosphate animal feed minerals and useful carbon dioxide by coreacting calcareous proteinacious by-products recovered from poultry hatcheries with phosphoric acid. Aqueous hatchery by-product containing protein and calcium in a weight ratio between 0.25 and 1.25 is comminuted until the contained dry matter particles exhibit diameters less than 1 millimeter and are reactive with phosphoric acid. The calcium in the comminuted hatchery by-product is coreacted with phosphoric acid using between one and two mols of P per mol of Ca until carbon dioxide formation ceases and the reacted aqueous hatchery by-product exhibits a pH between 2 and 4. The calcium phosphate granules are dried by commercial means until the protein hardens and forms a matrix bonding the calcium phosphate into attrition resistant granules of animal feed mineral.
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