The invention concerns a method of treating phosphate-containing waste, in particular phosphate-containing ash from waste-incineration plants, by wet-chemical digestion in order to obtain compounds of aluminum, calcium, phosphorus and nitrogen.

The invention concerns a method of treating phosphate-containing waste, in particular phosphate-containing ash from waste-incineration plants, by wet-chemical digestion in order to obtain compounds of aluminum, calcium, phosphorus and nitrogen.

An energy-releasing process for making fertilizer by consumption of a charable, reduced carbon source. The process comprises: (a) combining the carbon source with an oxide of an active metal to form a feedstock for high-temperature processing; (b) heating the feedstock in a furnace to yield an effluent gas entraining a carbide of the active metal; (c) cooling the effluent gas entraining the carbide of the active metal; (d) introducing nitrogen into the cooled effluent gas entraining the carbide of the active metal, to yield a cyanamide of the active metal and elemental carbon; (e) acidically hydrolyzing the cyanamide of the active metal to yield a cyanamide compound and a salt of the active metal; and (f) processing the cyanamide compound to yield an N-type fertilizer.

An energy-releasing process for making fertilizer by consumption of a charable, reduced carbon source. The process comprises: (a) combining the carbon source with an oxide of an active metal to form a feedstock for high-temperature processing; (b) heating the feedstock in a furnace to yield an effluent gas entraining a carbide of the active metal; (c) cooling the effluent gas entraining the carbide of the active metal; (d) introducing nitrogen into the cooled effluent gas entraining the carbide of the active metal, to yield a cyanamide of the active metal and elemental carbon; (e) acidically hydrolyzing the cyanamide of the active metal to yield a cyanamide compound and a salt of the active metal; and (f) processing the cyanamide compound to yield an N-type fertilizer.

Provided herein are systems and methods for producing nitrophosphates and mineralized carbon. Advantageously, the systems and methods are capable of sequestering carbon from the atmosphere. The systems generally include a first reactor for producing nitric acid; a mixer for mixing the nitric acid produced in the first reactor with a phosphate source, thereby producing nitro-phosphoric acid; and a second reactor for producing a solution comprising nitrophosphates and mineralized carbon, wherein the second reactor is operable to receive: the nitro-phosphoric acid from the mixer, ammonia, water, and carbon dioxide.

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.

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.

The present disclosure discloses a method, product, and system for cogenerating ferric phosphate through a nitrophosphate fertilizer device. The method comprises the steps of: acid-hydrolyzing phosphate rock with a nitric acid, and separating acid-insoluble substances to obtain an acid-hydrolyzed solution; freezing-crystallizing the acid-hydrolyzed solution, and carrying out solid-liquid separation to obtain a first solution; adding a solution containing sulfate ions to the first solution for reaction to obtain a second solution; subjecting the second solution to a denitrification to obtain a third solution; adding ammonia to the third solution for neutralization, and carrying out solid-liquid separation to obtain an ammonium phosphate solution, and adding an iron source to the ammonium phosphate solution for reaction to prepare a ferric phosphate. The present disclosure utilizes phosphate rock raw material to prepare a high-purity ferric phosphate, and by-product can be directly used for fertilizer preparation or as independent product, without waste.

The present disclosure discloses a method, product, and system for cogenerating ferric phosphate through a nitrophosphate fertilizer device. The method comprises the steps of: acid-hydrolyzing phosphate rock with a nitric acid, and separating acid-insoluble substances to obtain an acid-hydrolyzed solution; freezing-crystallizing the acid-hydrolyzed solution, and carrying out solid-liquid separation to obtain a first solution; adding a solution containing sulfate ions to the first solution for reaction to obtain a second solution; subjecting the second solution to a denitrification to obtain a third solution; adding ammonia to the third solution for neutralization, and carrying out solid-liquid separation to obtain an ammonium phosphate solution, and adding an iron source to the ammonium phosphate solution for reaction to prepare a ferric phosphate. The present disclosure utilizes phosphate rock raw material to prepare a high-purity ferric phosphate, and by-product can be directly used for fertilizer preparation or as independent product, without waste.

An energy-releasing process for making fertilizer by consumption of a charable, reduced carbon source. The process comprises: (a) combining the carbon source with an oxide of an active metal to form a feedstock for high-temperature processing; (b) heating the feedstock in a furnace to yield an effluent gas entraining a carbide of the active metal; (c) cooling the effluent gas entraining the carbide of the active metal; (d) introducing nitrogen into the cooled effluent gas entraining the carbide of the active metal, to yield a cyanamide of the active metal and elemental carbon; (e) acidically hydrolyzing the cyanamide of the active metal to yield a cyanamide compound and a salt of the active metal; and (f) processing the cyanamide compound to yield an N-type fertilizer.