Method for recovering phosphorus
AssigneeZentrum FüR Sonnenenergie- Und Wasserstoff-Forschung Baden-WüRttemberg GemeinnüTzige Stiftung
InventorsJochen Brellochs, Michael Specht, Ulrich Zuberbühler, Christian Eder, Christoph Kornmayer, Benjamin Klausing, Martin Schaub
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Abstract
The present invention concerns a method for recovering phosphorus by thermochemical reaction of a phosphorus-containing material such as an alternative fuel, for example, in the presence of calcium-containing particles in a moving bed reactor and subsequent separation of fines enriched with phosphorus from the moving bed reactor. Furthermore, the present invention concerns the use of a recyclable material obtained by the method as a fertilizer or fertilizer additive.
Claims10
A method for recovering phosphorus, comprising the following steps:
- i) thermochemical reaction of a phosphorus-containing material in the presence of calcium-containing particles in a moving bed reactor;
- ii) separation of fines enriched with phosphorus from the moving bed reactor, wherein the separation of the fines enriched with phosphorus is carried out from the reactor discharge in one or more separation devices which are disposed inside or outside the moving bed reactor, wherein a first separation device of the one or more separation devices has an operating temperature above 400° C., in order to reduce a quantity of heavy metals and/or polyaromatic hydrocarbons;
- and
- iii) reaction of the fines enriched with phosphorus obtained from step ii) with an acid in order to obtain a phytoavailable phosphorus-enriched recyclable material comprising water-soluble phosphates including calcium dihydrogen phosphate (Ca(H2PO4)2.H2O) and calcium hydrogen phosphate (Ca(HPO4).2H2O) for use as a fertilizer or a fertilizer additive.
Dependencies are inferred from the claim text.