Method for recycling organic waste material
AssigneeICL Europe Cooeperatief U.A.
InventorAlfred Edlinger
Life of this patent
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Abstract
A method for recycling organic waste material containing phosphorus oxides and metal oxides is particularly suited for recycling sewage sludge. The waste materials are mixed with chlorine carriers and then heat-treated at an air ratio of 0.85≦λ≦1.6 and at least partially oxidized. The metal chlorides thus formed are drawn off and recovered and the fraction remaining after the metal chlorides have been drawn off is subjected to reduction in order to obtain elemental phosphorus.
Claims12
A method of extracting phosphorous or a derivative thereof from organic waste material containing oxides of phosphorus and metal oxides, the method which comprises:
- mixing chlorine carriers into the organic waste material and adding lime to the waste material, to form a waste material admixture supplemented with chlorine carriers and lime;
- heating the resulting admixture at an air ratio of 0.85≦λ≦ to 1.6 and at least partially oxidizing;
- drawing off volatile metal chlorides thus formed with the gas phase, leaving a remaining melt fraction;
- recovering the metal chlorides;
- subjecting the remaining melt fraction which contains phosphorous to a reduction process to form gaseous elemental phosphorus or a derivative thereof;
- and
- drawing off the gaseous elemental phosphorous or a derivative thereof.
Dependencies are inferred from the claim text.