STUDY OF PHOSPHOGYPSUM HEAT TREATMENT MODES FOR OBTAINING ULTRAVIOLET PIGMENTS
Abstrak
The paper investigates the possibility of thermal processing of waste from the chemical industry – phosphogypsum. It is shown that when phosphogypsum is dried, partial dehydration of dihydrous calcium sulfate occurs, and when calcined at temperatures of 600…1200 °C, complete dehydration occurs. It was found that after heat treatment below 800 °C, the samples actively absorb moisture. During the heat treatment of phosphogypsum in the presence of a reducing agent, two endothermic effects are observed associated with the sequential dehydration of CaSO4·2H2O, and a wide peak of the exothermic effect associated with the thermal destruction of the reducing agent and the formation of calcium sulfide from phosphogypsum. Phosphogypsum samples heat-treated in the presence of a reducing agent acquire the ability to emit a yellow-orange glow under the influence of ultraviolet radiation. Synthesized pigments can be used to produce water-based paints and varnishes.
Penulis (4)
O. Medennikov
M. A. Egorova
N. Shabelskaya
Z. Khliyan
Akses Cepat
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- 2025
- Bahasa
- en
- Sumber Database
- Semantic Scholar
- DOI
- 10.14489/glc.2025.04.pp.044-052
- Akses
- Open Access ✓