Abstract: A source of phosphate for agriculture and food industry comprises a phosphate salt in solid form of formula Mn(HPO4)y.zH2O in which M is Na, K, NH4, n=2, and y=1; or M is Ca, n=1, y=1; or M is Al or Fe, n=2, y=3; and in which z is 0, 1 or 2, wherein said phosphate salt has a phosphate content expressed as a P2O5 content of between 30 and 50% by weight of the phosphate salt, and it has a cadmium content lower than 0.40 ppm.

Abstract: Methods treat ash from waste incineration, wherein the methods at least comprise: a) the digestion of the ash by a leaching liquor containing phosphate ions in solution such as to form a first solid phase comprising impurities and a first liquid phase comprising phosphate ions; and b) the separation of said first liquid phase comprising phosphate ions from said first solid phase. Step a) is carried out for a duration of less than one hour or at a temperature of more than 40° C.

Abstract: Methods treat ash from waste incineration, wherein the methods at least comprise: a) the digestion of the ash by a leaching liquor containing phosphate ions in solution such as to form a first solid phase comprising impurities and a first liquid phase comprising phosphate ions; and b) the separation of said first liquid phase comprising phosphate ions from said first solid phase. Step a) is carried out for a duration of less than one hour or at a temperature of more than 40° C.

Abstract: A source of phosphate for agriculture and food industry comprises a phosphate salt in solid form of formula Mn(HPO4)y.zH2O in which M is Na, K, NH4, n=2, and y=1; or M is Ca, n=1, y=1; or M is Al or Fe, n=2, y=3; and in which z is 0, 1 or 2, wherein said phosphate salt has a phosphate content expressed as a P2O5 content of between 30 and 50% by weight of the phosphate salt, and it has a cadmium content lower than 0.40 ppm.

Abstract: The invention relates to an additive mineral for a dietary composition for animals comprising, in a biodigestible form, at least one phosphoric acid salt and a compound capable of forming a salt therewith. The additive is in the form of an aqueous solution in which the salt is in a dissolved state and is provided in the form of phosphate ions and of ions of said compound. The invention also relates to a method for producing the additive and to a device for carrying out this method.

Abstract: The invention relates to a process for the production of high purity phosphoric acid which has a very low content in antimony, and is suitable for food, pharmaceutical, or electronic industry.

Abstract: The invention relates to a process for the production of high purity phosphoric acid which has a very low content in antimony, and is suitable for food, pharmaceutical, or electronic industry.

Abstract: A method for etching phosphate ores includes a single-pass digesting of ores which P205 content is greater than 20% in weight by a hydrochloric aqueous acid solution having an HCI concentration less than 10% by weight with an etching solution formation and the separation of the insoluble solid phase and the aqueous phase of the etching solution. Preneutralization of the etching solution is accomplished by a neutralizing agent prior to the separation in such a way that the etching solution pH which is less than pH to which an important part of phosphate ions in solution precipitates in the form of calcium monohydrogen phosphate (DCP) is adjusted and in subsequently neutralizing the separated aqueous phase in such a way that a pure DCP is precipitated.

Abstract: A method of preparing a phosphoric acid salt which includes at least one attack on phosphate ore by an aqueous solution of hydrochloric acid, with the formation of an attack liquor, a first separation, in the attack liquor, between an insoluble solid phase and an aqueous phase, a neutralization of the separated aqueous phase by the addition of a calcium compound in order to form, with phosphate ions contained in this aqueous phase, a calcium phosphate insoluble in water, which precipitates, and a second separation, in the neutralized aqueous phase, between a liquid phase and a precipitated solid phase based on the calcium phosphate insoluble in water, wherein the attack on the phosphate ore includes dissolving the phosphate in the ore, the attack liquor containing this phosphate in the form of phosphate ions, and the solid phase separated from the attack liquor contains impurities and the aqueous phase separated from the attack liquor contains the phosphate ions thereof, chloride ions and calcium ions, this a

Abstract: The invention relates to an additive mineral for a dietary composition for animals comprising, in a biodigestible form, at least one phosphoric acid salt and a compound capable of forming a salt therewith. The additive is in the form of an aqueous solution in which the salt is in a dissolved state and is provided in the form of phosphate ions and of ions of said compound. The invention also relates to a method for producing the additive and to a device for carrying out this method.

Abstract: A method of preparing a phosphoric acid salt which includes at least one attack on phosphate ore by an aqueous solution of hydrochloric acid, with the formation of an attack liquor, a first separation, in the attack liquor, between an insoluble solid phase and an aqueous phase, a neutralization of the separated aqueous phase by the addition of a calcium compound in order to form, with phosphate ions contained in this aqueous phase, a calcium phosphate insoluble in water, which precipitates, and a second separation, in the neutralized aqueous phase, between a liquid phase and a precipitated solid phase based on the calcium phosphate insoluble in water, wherein the attack on the phosphate ore includes dissolving the phosphate in the ore, the attack liquor containing this phosphate in the form of phosphate ions, and the solid phase separated from the attack liquor contains impurities and the aqueous phase separated from the attack liquor contains the phosphate ions thereof, chloride ions and calcium ions, this a

Abstract: A method for the production of phosphoric acid comprising a phosphate ore attack by a first aqueous chlorohydric acid solution, separation in the attack liquor between a solid insoluble phase containing impurities and a separate aqueous phase comprising phosphate ions in a solution, chloride ions and calcium ions, neutralization of said attack phase separated from the liquor by adding a calcium compound so that water-insoluble calcium phosphate can be formed with said phosphate ions, precipitating a separation in said neutralized aqueous phase comprising chloride ions and calcium ions in a solution and a solid precipitated phase based on said water-insoluble calcium phosphate, and solubilization of at least one part of the precipitated solid phase in a separated manner in a second aqueous chlorohydric acid solution, with formation of an aqueous solution containing phosphate ions, chloride ions and calcium ions to be extracted by an organic extractant in a liquid-liquid-type extraction.

Abstract: The inventive method for producing strong base phosphates consists in forming a pulp consisting of an aqueous phase which contains a water-soluble calcium phosphate and a solid impurity-containing phase, in separating said phases, transferring calcium ions to a liquid phase by a strong base ions associated with forming the aqueous solution of the pure phosphate(s) of said strong base and in precipitating a pure water-insoluble calcium phosphate. Said method also consists in mixing phosphoric ores and acid in such a way that a pasty triple superphosphate composition is obtained and in adding water thereto in order to produce said pulp.

Abstract: The inventive method for etching phosphate ores involves a single-pass digesting of ores whose P2O5 content is greater than 20% in weight by at least 10% in weight of a hydrochloric aqueous acid solution associated with an etching solution formation and the separation of the insoluble solid phase and the aqueous phase of said etching solution. Said method consists in pre-neutralising the etching solution by a neutralising agent prior to said separation in such a way that the etching solution pH which is less than pH to which an important part of phosphate ions in solution precipitates in the form of calcium monohydrogen phosphate (DCP) is adjusted and in subsequently neutralising said separated aqueous phase in such a way that a pure DCP is precipitated.

Abstract: The invention concerns a method for producing phosphoric acid, which consists in: at least an attack of phosphate ore with an attacking liquid containing soluble phosphate ions, forming of an attacking product, separating in the attacking product between an insoluble solid phase containing impurities and a liquid phase having soluble phosphate ions and calcium ions, introducing in the separated liquid phase an acid stronger than phosphoric acid and which forms, with said calcium ions, a soluble calcium salt, and isolating a solution of said calcium salt, not contaminated by the impurities, thereby obtaining a phosphoric acid solution.

Abstract: A method for the production of phosphoric acid comprising a phosphate ore attack by a first aqueous chlorohydric acid solution, separation in the attack liquor between a solid insoluble phase containing impurities and a separate aqueous phase comprising phosphate ions in a solution, chloride ions and calcium ions, neutralization of said attack phase separated from the liquor by adding a calcium compound so that water-insoluble calcium phosphate can be formed with said phosphate ions, precipitating a separation in said neutralized aqueous phase comprising chloride ions and calcium ions in a solution and a solid precipitated phase based on said water-insoluble calcium phosphate, and solubilization of at least one part of the precipitated solid phase in a separated manner in a second aqueous chlorohydric acid solution, with formation of an aqueous solution containing phosphate ions, chloride ions and calcium ions to be extracted by an organic extractant in a liquid-liquid-type extraction.

Abstract: The invention concerns a method for producing phosphoric acid, which consists in: at least an attack of phosphate ore with an attacking liquid containing soluble phosphate ions, forming of an attacking product, separating in the attacking product between an insoluble solid phase containing impurities and a liquid phase having soluble phosphate ions and calcium ions, introducing in the separated liquid phase an acid stronger than phosphoric acid and which forms, with said calcium ions, a soluble calcium salt, and isolating a solution of said calcium salt, not contaminated by the impurities, thereby obtaining a phosphoric acid solution.

Abstract: Method of purification by extraction of at least one substance to be isolated from a liquid medium, comprising an addition to the latter of an organic compound, entrainable by a vapor, which has a molecule with an acidic-basic character in the Lewis sense due to at least one atom of N, O and/or S forming one or more active sites provided with a free electron pair, this pair or these pairs being in resonance with at least one other pair carried by the molecule, this addition being carried out in a quantity sufficient to give rise to a product of an equilibrium reaction between the organic compound and the said at least one substance to be isolated, and sufficient to cause a precipitation of this equilibrium reaction product, a filtration of the precipitate and an entrainment by vapor of the organic compound from the precipitate, with a yield of the substance to be isolated in purified form.