Production of ammonium phosphates
AssigneeEasymining Sweden AB
InventorYariv Cohen
Life of this patent
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Abstract
A method for production of ammonium phosphates includes providing (210) of a phosphorus-loaded water immiscible liquid phase, adding (212) of anhydrous ammonia to the water immiscible liquid phase, precipitating (214) of mono-ammonium phosphate and/or di-ammonium phosphate from the water immiscible liquid phase and extracting (218) of the precipitated mono-ammonium phosphate and/or di-ammonium phosphate from the water immiscible liquid phase. The method further includes controlling (216) of a temperature of the water immiscible liquid phase during the adding (212) and precipitating (214) to a predetermined temperature interval.
Claims21
1-24. (canceled)
A method for production of ammonium phosphates, comprising the steps of:
- providing a phosphorus-loaded water immiscible liquid phase;
- adding anhydrous ammonia to said phosphorus-loaded water immiscible liquid phase;
- precipitating at least one of mono-ammonium phosphate and di-ammonium phosphate from said water immiscible liquid phase;
- controlling a temperature of the water immiscible liquid phase during said steps of adding and precipitating to a predetermined temperature interval;
- extracting said precipitated at least one of mono-ammonium phosphate and di-ammonium phosphate from said water immiscible liquid phase;
- washing crystals of said extracted precipitated at least one of mono-ammonium phosphate and di-ammonium phosphate;
- said step of washing comprises washing with saturated aqueous solution of ammonium phosphate;
- drying said washed crystals;
- separating residual scavenger washed from said crystals;
- said step of separating residual scavenger comprises phase separation of said scavenger and said saturated aqueous solution of ammonium phosphate;
- reusing separated residual scavenger for further adsorbing of phosphorous to be reused for further extraction;
- and
- reusing washing liquid depleted from residual scavenger for further washing of said crystals.
An arrangement for production of ammonium phosphates, comprising:
- a mixing volume;
- said mixing volume having an inlet for a phosphorus-loaded water immiscible liquid phase;
- said mixing volume having an inlet for adding anhydrous ammonia into said water immiscible liquid phase;
- a heat exchanger arranged in thermal contact with said water immiscible liquid phase;
- a controller arranged for operating said heat exchanger to keep said water immiscible liquid phase in said mixing volume within a predetermined temperature interval;
- a precipitate remover arranged for removing crystals of at least one of precipitated mono-ammonium phosphate and di-ammonium phosphate from said mixing volume;
- a washer connected to said precipitate remover and arranged for washing said crystals;
- said washer is arranged for washing said crystals with saturated aqueous solution of ammonium phosphate;
- a drier connected to said washer and arranged for drying said washed crystals;
- and
- a separator connected to said washer and arranged for separating residual water immiscible liquid phase washed from said crystals;
- said separator being connected to said inlet to said extraction section for water immiscible liquid phase depleted from phosphorous for reusing said separated residual water immiscible liquid phase for further adsorbing of phosphorous in said extraction section;
- said separator being further arranged for providing washing liquid depleted from residual water immiscible liquid phase for reuse for washing crystals in said washer;
- said separator comprising a phase separator arranged for separation of said water immiscible liquid phase and said saturated aqueous solution of ammonium phosphate.
Dependencies are inferred from the claim text.