C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 25/16 (2006.01) C01B 7/19 (2006.01) C01B 25/18 (2006.01) C01B 25/22 (2006.01) C01B 25/32 (2006.01) C01F 11/22 (2006.01) C01F 11/46 (2006.01)
Patent
CA 2411977
Phosphoric acid, essentially free from impurities, is prepared by reacting aqueous hydrofluoric acid with phosphate in particles of calcium bearing phosphate rock to form a calcium fluoride pseudomorph solid from which filter- grade phosphoric acid is separated. By reacting the pseudomorph solid with sulfuric acid and thermally treating the reaction product, the HF can be liberated and recycled back to the reaction step of the process. All of the impurities from the phosphate rock are contained in the resulting CaSO4.
Cette invention concerne un acide phosphorique pratiquement exempt d'impuretés que l'on obtient en faisant réagir un acide fluorhydrique aqueux avec du phosphate dans des particules de phosphate de calcium minéral pour former un pseudomorphe de fluorure de calcium dont on sépare de l'acide phosphorique de qualité filtre. En faisant réagir le solide pseudomorphe avec de l'acide sulfurique et en soumettant le produit de réaction à un traitement thermique, il est possible de libérer l'acide fluorhydrique et de le recycler à l'étape réactionnelle du procédé. Toutes les impuretés présentes dans le phosphate minéral sont contenues dans le CaSO¿4? Qui en résulte.
Breed Claude E.
Mcgill Kenneth E.
Sweat Samuel Franklin
Hf Extraction Llc
Ridout & Maybee Llp
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