Abstract
Manufacturing of phosphoric acid from hydroxyapatite, contained in the ashes of the incinerated meat-bone wastes The results of the investigations concerning phosphoric acid manufacturing, by the extraction method, from the ashes containing hydroxyapatite, obtained through the thermal treatment of bone sludge have been presented. The incinerated bone sludge with ~ 16% P content and the minimal amount of impurities can be an alternative source for phosphoric acid production. The process consists in two stages. In the 1st stage, reaction of hydroxyapatite with phosphoric acid resulting in monocalcium phosphate formation in the solution obtained is carried out. The tests revealed that overall hydroxyapatite dissolution in phosphoric acid takes place when the concentration is 37% H3PO4. In the 2nd stage monocalcium phosphate is converted into calcium sulphate using concentrated sulphuric acid at the recommended temperature of 95°C. The principles of the technological idea of the process of phosphoric acid manufacturing from HA-containing ashes, obtained by bone wastes incineration, as well as a preliminary economic analysis for the production of 10 000 t/year of food-grade phosphoric acid have been developed.
Highlights
About 18mln t/year of meat wastes, containing phosphorus compound, are generated by the meat industry in the European Union countries
It has been found (Figure 4) that the ash resulted from bone sludge incineration at the temperature of 950°C in the stationary chamber oven in air atmosphere is of homogeneous structure
The results that led to the elaboration of phosphoric acid production method from the ashes obtained through the incineration of bone wastes from meat industry have been presented
Summary
About 18mln t/year of meat wastes, containing phosphorus compound, are generated by the meat industry in the European Union countries. Bone sludge (protein-free and fat-free bones) – skin, hoofs, horns, pigs bristle, feathers, blood recovered from other than ruminant animals, parts of the animals suitable for consumption, and those, though discarded by the people, estimated as no causing danger of a disease transfer from animal to human being belong to the 3rd category of wastes. They can be utilised thermally or processed into biogas or compost. The results concerning the extraction of phosphoric acid from the ashes obtained by thermal processing of bone sludge have been presented
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