Phase relationships in the system V/sub 2/O/sub 5/-CaO-MnO-Mn/sub 2/O/sub 3/ and estimation of the composition of the products of oxidation of converter slag containing vanadium, iron, manganese, and calcium

Journal Article · Mon Feb 10 00:00:00 EST 1986 · J. Appl. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6340066

Strepetov, S V; Dobosh, V G; Fotiev, A A; Povolotskii, V D; Surat, L L

The present technology of vanadium production involves oxidative roasting of converter slags with addition of CaCO/sub 3/ followed by extraction of the vanadium compounds formed. Not enough is known about the part played by calcium and manganese in phase formation during oxidative roasting of vanadium-containing slags. The authors experimental samples were obtained by the solid-methods. The original oxides were Mn/sub 2/O/sub 3/ and V/sub 2/O/sub 5/ of ultrapure grade; CaCO/sub 3/ was of analytical grade. The phase composition of the synthesized samples and of the products of oxidation of vanadium-containing slag was studied with the aid of the DRON-2 diffractometer, using Cu K..cap alpha.. radiation. Distribution of the elements between the products of oxidation of vanadium-containing slag was investigated with the aid of the CAMECA MS-46 electron microprobe analyzer. It follows from the authors diagram of phase equilibria in the system V/sub 2/O/sub 5/-CaO-MnO-Mn/sub 2/O/sub 3/ (Fig. 1), that calcium and manganese metavanadates form a limited series of solid solutions with a wide homogeneity region: Ca/sub 1-x/Mn/sub x/(VO/sub 3/)/sub 2/ (0 less than or equal to x less than or equal to 0.62) and Mn/sub 1-x/Ca/sub x/(VO/sub 3/)/sub 2/ (0 less than or equal to x less than or equal to 0.32). In the quasibinary join Ca/sub 2/V/sub 2/O/sub 7/=Mn/sub 2/V/sub 2/O/sub 7/ (0 less than or equal to x less than or equal to 0.60). It was shown that a solid solution of the composition Ca/sub 3-3x/Mn/sub 3x/(VO/sub 4/)/sub 2/, where 0 less than or equal to x less than or equal to 0.10, is formed on the basis of calcium orthovanadate. A new compound of garnet structure, Ca/sub 2.25 + x/Mn/sub 2.25 - x/ x V/sub 3/O/sup 12/, where 0 less than or equal to x less than or equal to 0.75, was discovered in the system studied.

• OSTI ID: 6340066
• Journal Information: J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 58:8; Other Information: Translated from Zh. Prikl. Khim.; 58: No. 8, 1880-1882(Aug 1985)
• Country of Publication: United States
• Language: Russian

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
PHASE STUDIES
MANGANESE OXIDES
SLAGS
ROASTING
VANADIUM
PRODUCTION
VANADIUM OXIDES
CRYSTAL STRUCTURE
ELECTRON MICROPROBE ANALYSIS
EQUILIBRIUM
HYDROMETALLURGY
IRON OXIDES
QUANTITY RATIO
VANADATES
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
EXTRACTIVE METALLURGY
IRON COMPOUNDS
MANGANESE COMPOUNDS
METALLURGY
METALS
MICROANALYSIS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM COMPOUNDS
360101* - Metals & Alloys- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies