Solid-phase synthesis of wollastonite in natural and technogenic siliceous stock mixtures with varying levels of calcium carbonate component

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Abstract

Solid-phase synthesis of wollastonite has been determined to be primarily affected by the structural and mineralogical properties of the siliceous stock – its chemico-mineralogical composition (purity and presence of amorphous component) and granularity, as well as variations in phase change behaviour at high temperatures. Wollastonite synthesis occurs most completely in the mixtures of calcium carbonate with amorphous (microsilica) or semi-crystalline (gaize or diatomite) siliceous stock, yielding 92–96% wollastonite at 1200 °С. For natural quartz-based stock (marshallite), wollastonite yield does not exceed 60–80%. Solid-phase wollastonite synthesis in mixtures of reactive amorphous or semi-crystalline siliceous stock with varying quantities of calciferous stock (10–50 wt% CaO) produces wollastonitic ceramics chemically resistant to molten aluminium with the specific gravity of 1.1–1.7 g/cm3 and the compressive strength of 28–76 MPa, which exceeds the requirements for ceramics in foundry equipment by a factor of 3–3.5.

Original languageEnglish
Pages (from-to)16453-16462
Number of pages10
JournalCeramics International
Volume42
Issue number15
DOIs
Publication statusPublished - 15 Nov 2016

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Calcium Carbonate
Calcium carbonate
Crystalline materials
Silica fume
Foundries
Density (specific gravity)
Compressive strength
Molten materials
Quartz
Aluminum
Chemical analysis
calcium silicate
Temperature

Keywords

  • A. Calcination
  • A. Powders: solid state reaction
  • C. Strength
  • D. Silicate
  • E. Thermal applications

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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title = "Solid-phase synthesis of wollastonite in natural and technogenic siliceous stock mixtures with varying levels of calcium carbonate component",
abstract = "Solid-phase synthesis of wollastonite has been determined to be primarily affected by the structural and mineralogical properties of the siliceous stock – its chemico-mineralogical composition (purity and presence of amorphous component) and granularity, as well as variations in phase change behaviour at high temperatures. Wollastonite synthesis occurs most completely in the mixtures of calcium carbonate with amorphous (microsilica) or semi-crystalline (gaize or diatomite) siliceous stock, yielding 92–96{\%} wollastonite at 1200 °С. For natural quartz-based stock (marshallite), wollastonite yield does not exceed 60–80{\%}. Solid-phase wollastonite synthesis in mixtures of reactive amorphous or semi-crystalline siliceous stock with varying quantities of calciferous stock (10–50 wt{\%} CaO) produces wollastonitic ceramics chemically resistant to molten aluminium with the specific gravity of 1.1–1.7 g/cm3 and the compressive strength of 28–76 MPa, which exceeds the requirements for ceramics in foundry equipment by a factor of 3–3.5.",
keywords = "A. Calcination, A. Powders: solid state reaction, C. Strength, D. Silicate, E. Thermal applications",
author = "Vakalova, {T. V.} and Pogrebenkov, {V. M.} and Karionova, {N. P.}",
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AU - Vakalova, T. V.

AU - Pogrebenkov, V. M.

AU - Karionova, N. P.

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N2 - Solid-phase synthesis of wollastonite has been determined to be primarily affected by the structural and mineralogical properties of the siliceous stock – its chemico-mineralogical composition (purity and presence of amorphous component) and granularity, as well as variations in phase change behaviour at high temperatures. Wollastonite synthesis occurs most completely in the mixtures of calcium carbonate with amorphous (microsilica) or semi-crystalline (gaize or diatomite) siliceous stock, yielding 92–96% wollastonite at 1200 °С. For natural quartz-based stock (marshallite), wollastonite yield does not exceed 60–80%. Solid-phase wollastonite synthesis in mixtures of reactive amorphous or semi-crystalline siliceous stock with varying quantities of calciferous stock (10–50 wt% CaO) produces wollastonitic ceramics chemically resistant to molten aluminium with the specific gravity of 1.1–1.7 g/cm3 and the compressive strength of 28–76 MPa, which exceeds the requirements for ceramics in foundry equipment by a factor of 3–3.5.

AB - Solid-phase synthesis of wollastonite has been determined to be primarily affected by the structural and mineralogical properties of the siliceous stock – its chemico-mineralogical composition (purity and presence of amorphous component) and granularity, as well as variations in phase change behaviour at high temperatures. Wollastonite synthesis occurs most completely in the mixtures of calcium carbonate with amorphous (microsilica) or semi-crystalline (gaize or diatomite) siliceous stock, yielding 92–96% wollastonite at 1200 °С. For natural quartz-based stock (marshallite), wollastonite yield does not exceed 60–80%. Solid-phase wollastonite synthesis in mixtures of reactive amorphous or semi-crystalline siliceous stock with varying quantities of calciferous stock (10–50 wt% CaO) produces wollastonitic ceramics chemically resistant to molten aluminium with the specific gravity of 1.1–1.7 g/cm3 and the compressive strength of 28–76 MPa, which exceeds the requirements for ceramics in foundry equipment by a factor of 3–3.5.

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