MATERIALS TRANSACTIONS· 2026Q2
Production of Calcium Tungstate by Corrosion Reaction Synthesis
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- Q2SCImago
- 2026year
Short summary
Calcium tungstate (CaWO4) powder with particle sizes of 1.8–18.5 µm was synthesized at 973 K using a novel corrosion reaction method, outperforming solid-state reaction which required 1173 K and produced a wider particle size range (0.4–22.0 µm).
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Key points
- Calcium tungstate (CaWO4) synthesized via corrosion reaction of tungsten in ammonia-hydrogen peroxide solution with calcium.
- Corrosion synthesis yielded CaWO4 powder calcined at 973 K with particle sizes of 1.8–18.5 µm.
- Conventional solid-state reaction required higher temperature (1173 K) and produced a wider particle size range (0.4–22.0 µm).
AI-generated from the title and abstract; the full text is not read.
Abstract
We attempted to produce calcium tungstate (CaWO4) using metal corrosion reaction, and compared it with that produced by solid-state reaction. Tungsten corroded in hydrogen peroxide containing ammonia and eventually dissolved completely. When calcium was added to this solution, the calcium corrosion reaction proceeded easily without the addition of a corrosion-accelerating substance. Oxide powder was obtained by drying and calcinating the above mixed solution. It was identified that the powder which was calcinated at 973 K was CaWO4 and the particle size was 1.8∼18.5 µm. In the case of the solid-state reaction method using tungsten oxide and calcium carbonate as raw materials, CaWO4 powder with particle sizes ranging from 0.4 µm to 22.0 µm was synthesized at 1173 K.
The authors' abstract, as published at the source. MATERIALS TRANSACTIONS, 2026 · DOI ↗
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Fluid Flow and Transfer ProcessesChemical Engineering