Importance

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Abstract

Bone-containing animal material, such as slaughterhouse waste which has been scoured and dewatered by pressing, is separated into a bone-containing phase and a meat protein-containing phase by stirring the material with water after comminution to form a suspension (2) which is subjected to a separation in a hydrocyclone (8). The suspension is hereby separated into a bone-containing phase leaving the cyclone through its bottom nozzle, and into a meat protein-containing phase leaving the cyclone through its vortex detector and being processed into a protein product in a manner known per se. In the phase rich in meat protein at least about 70 weight-% of the dry matter is protein, whereas the bone-containing phase has a protein-content in the dry matter of less than 40 weight-%, including the ossein contained in the bones.

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First Claim