US 2003/0190390 A1Published application

Calcium phosphate from hatchery by-product

AssigneeAgri-Nutrients Technology Group, Inc.

InventorWilliam P. Moore

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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. Dry recycled calcium phosphate is admixed with the aqueous hatchery by-product to form damp solids containing between 7 and 18 percent water. The damp solids are rolled by means of a granulator until spheroid granules containing calcium phosphate homogeneously mixed with protein are formed. 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 containing between 5 and 20 percent protein, between 12 and 18 percent calcium, and between 15 and 24 percent phosphorus. The method allows the use of economical wet process phosphoric acid containing low fluoride contents. The chemical intermediate carbon dioxide may be effectively used to produce animal feed mineral potassium carbonate by recovering the carbon dioxide by reacting with aqueous potassium hydroxide.

Claims10

Dependent claims

A method of preparing attrition resistant granular proteinacious calcium phosphate animal feed minerals and useful carbon dioxide by coreacting calcareous by-products from poultry hatcheries and phosphoric acid, the method comprising:

(a) providing a flowable aqueous hatchery by-product containing particles of dry matter amounting to between 35 and 70 percent of the flowable by-product;
(b) comminuting the flowable by-product containing protein and calcium moieties in a weight ratio between 0.25 and 1.25, the calcium moieties consisting essentially of calcium carbonate, until the particles of dry matter exhibit diameters less than 1 millimeter and the calcium moieties exhibit coreactivity with phosphoric acid;
(c) admixing with the comminuted flowable by-product an amount of phosphoric acid sufficient to provide between 1.0 and 2.0 molecules of phosphorus per molecule of calcium in the flowable by-product;
(d) coreacting the phosphoric acid and the calcium moieties at a temperature between 20 and 100° C. to form proteinacious calcium phosphate and carbon dioxide gas until carbon dioxide gas formation ceases and the reacted aqueous flowable by-product exhibits a pH between 2 and 4;
(e) admixing the reacted flowable by-product with an amount of recycled proteinacious calcium phosphate sufficient to provide a water concentration between 7 and 18 percent in the damp solids formed by the mixing;
(f) rolling the damp solids by means of a granulator until spheroid granules containing calcium phosphate mixed with protein are formed;
and,
(g) drying the spheroid granules until the protein hardens and forms a matrix bonding the calcium phosphate into attrition resistant granules of animal feed mineral containing between 5 and 20 percent protein, between 12 and 18 percent calcium, and between 15 and 24 percent phosphorus.

5 more elements

Dependencies are inferred from the claim text.