Rate of calcium difluoride dissolution in phosphoric acid solutions in presence of silicon dioxide

Journal Article · Sun Mar 20 00:00:00 EST 1988 · J. Appl. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6339376

Astrelin, I M; Tolstopalova, N M; Gladushko, V I; Chernobrov, O V; Bogachev, V G; Mishin, N I

The authors have developed and tested a process for phosphoric-acid decomposition of sludges in presence of silicon dioxide, yielding concentrated phosphate fertilizers and fluorine-containing acids. In order to clarify the decomposition mechanism, they studied the solubility of the sludge components in sulfuric acid solutions. Since the main components of sludges are CaF/sub 2/, Ca/sub 3/(PO/sub 4/)/sub 2/, SiO/sub 2/, CaSO/sub 4/, they consider in this paper the interaction of CaF/sub 2/ with phosphoric acid and the influence of the amount and kind of silicon dioxide added on it.

• Research Organization: Kiev Polytechnic Institute (USSR)
• OSTI ID: 6339376
• Journal Information: J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 60:10; Other Information: Translated from Zh. Prikl. Khim.; 60: No. 10, 2173-2177(Oct 1987)
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALCIUM FLUORIDES
DISSOLUTION
FERTILIZERS
WASTE PRODUCT UTILIZATION
INDUSTRIAL WASTES
MATERIALS RECOVERY
SILICON OXIDES
CATALYTIC EFFECTS
SLUDGES
CHEMICAL REACTION KINETICS
OPTIMIZATION
PHOSPHATES
PHOSPHORIC ACID
SOLUBILITY
TEMPERATURE EFFECTS
WASTE MANAGEMENT
WATER POLLUTION ABATEMENT
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHALCOGENIDES
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MANAGEMENT
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
POLLUTION ABATEMENT
PROCESSING
REACTION KINETICS
RECOVERY
SILICON COMPOUNDS
WASTE PROCESSING
WASTES
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
400201 - Chemical & Physicochemical Properties