On the interaction of apatite with low-concentration sulfuric acid solutions
Abstract
Studies on the kinetics of apatite dissolution in sulfuric acid have shown that the formation of insoluble compound films on the surface of the solid phase hinders solvent access to it and leads to a slowdown and even complete cessation of the dissolution process. In the concentration range of 16–25 N H₂SO₄, the dissolution reaction is sharply retarded. At concentrations above 25 N, apatite dissolves rapidly. This is attributed to the different physical structure of the calcium sulfate film, which depends on the concentration of the solvent. ...
Область исследования:
(Archived) Without section
Funding:
None
References
- Brutskus E. B., Chepelevetsky M. L. Isochrons—isotherms of apatite dissolution in the H₂SO₄–H₃PO₄–H₂O system, as an example of topochemical kinetics, and superphosphate production. Chemical. Analysis of the USSR AS Izv. sektora fiz.-khim. analiza AN SSSR, No. 20, 1950. (in Russian)
- Krasnov K. S. Kinetics of apatite dissolution in saturated CaO–P₂O₅–H₂O systems. J. Appl. Chemistry Zh. prikl. khimii, vol. 26, 1953. (in Russian)
- Pozin M. E., Kopylev B. A., Ten-Se-Den. Research in the field of mineral fertilizer technology. Lenin Institute of Technology Tr. Leningr. tekhnol. in-ta, iss. 36, 1956. (in Russian)
- Akselrud G. A., Pokhodeyko L. A. Kinetics of a heterogeneous reaction between a solid and a liquid, accompanied by the formation of an insoluble solid phase. J. Phys. Chemistry Zh. fiz. khimii, vol. 40, iss. 2, 346, 1966. (in Russian)
- Dolivo-Dobrovolsky V. V. Some patterns of the dissolution processes of dispersed solids. Jour. LMI Zapiski Gornogo Instituta, vol. XLII, iss. 3, 1963. (in Russian)
- Ma T. S., McKinley J. D. Mikrochemie, No. 1–2, 1953.
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