US 8,034,149 B2 · Process for obtaining a fertilizer with sustained release of phosphorus

Abstract

The present invention relates to obtaining a fertilizer with sustained release of phosphorus, enriched with other macro and micronutrients, which can be produced by pyrolysis of pyrobituminous shale, in combination with calcareous shale and with natural phosphatidic rocks. The invention presents a process for obtaining a solid fertilizer with sustained release of phosphorus, enriched with Ca, Mg, S, Si and micronutrients, by a combination of pyrolysis of a pyrobituminous shale at a temperature of 450-500° C., with the addition of calcareous shale and of a phosphatidic rock, which represents a promising innovation compared to the prior art, and will certainly serve to fill a gap in the availability of fertilizers permitted for use in agroecological systems.

Claims6

Dependent claims

A process for obtaining fertilizer with sustained release of phosphorus comprising the steps of:

providing a pyrobituminous shale in combination with carbonate rocks of marine sedimentary origin and phosphate rocks of low solubility, and
conducting pyrolysis, at temperatures between 450° C. to 500° C. with injection of an inert gas, of the pyrobituminous shale in combination with the carbonate rocks of marine sedimentary origin and the phosphate rocks of low solubility, to obtain fertilizer.

Dependencies are inferred from the claim text.

Process for obtaining a fertilizer with sustained release of phosphorus

Life of this patent

Process for obtaining a fertilizer with sustained release of phosphorus

Life of this patent

Abstract

Claims6