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.
F23J 1/00 - Enlèvement des cendres, mâchefers ou scories des chambres de combustion
B01D 15/36 - Adsorption sélective, p. ex. chromatographie caractérisée par le mécanisme de séparation impliquant une interaction ionique, p. ex. échange d'ions, paire d'ions, suppression d'ions ou exclusion d'ions
C05B 17/00 - Autres engrais phosphatés, p. ex. phosphates naturels, os verts
B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
C05B 11/10 - Traitement par un acide minéral par l'acide orthophosphorique
B09B 5/00 - Opérations non couvertes par une seule autre sous-classe ou par un seul autre groupe de la présente sous-classe
C05F 1/00 - Engrais fabriqués à partir de cadavres d'animaux ou de parties de ceux-ci
C05F 3/00 - Engrais fabriqués à partir des excréments humains ou animaux, y compris le fumier
C05F 7/00 - Engrais fabriqués à partir des eaux résiduaires ou d'épandage, wagage, limon ou masses similaires
n(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.
The present invention relates to a method for treating ash from waste incineration, comprising: 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.
The invention concerns 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; said phosphate salt has a phosphate content expressed as a P2O5 content of between 30 and 50% by weight of the phosphate salt, characterised in that it has a cadmium content lower than 0.40 ppm.
The invention concerns 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; said phosphate salt has a phosphate content expressed as a P2O5 content of between 30 and 50% by weight of the phosphate salt, characterised in that it has a cadmium content lower than 0.40 ppm.
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.
C01B 25/22 - Préparation par réaction de produits contenant un phosphate avec un acide, p. ex. procédé par voie humide
C01B 25/222 - Préparation par réaction de produits contenant un phosphate avec un acide, p. ex. procédé par voie humide avec l'acide sulfurique, avec un mélange d'acides consistant principalement en acide sulfurique ou un mélange de composés formant de l'acide sulfurique in situ, p. ex. avec un mélange d'anhydride sulfureux, d'eau et d'oxygène
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.
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