Technology for processing phosphogypsum into a fluorescent dye based on calcium sulfide

Objectives . There is considerable economic demand for products obtained by processing phosphogypsum. In particular, calcium sulfide-based materials having luminescent properties are the object of intensive study due to wide range possibilities their use. The alloying structure sulfide with cations rare earth elements leads appearance a glow various colors. However, high cost such phosphorescent chemical purity reagents required synthesis. development efficient methods obtaining from phosphogypsum part an integrated approach solving problem synthesizing economically demanded production waste. Methods synthesized were studied using X-ray phase analysis and scanning electron microscopy. Photos samples taken under illumination incandescent lamp or fluorescent ultraviolet lamp. Results According analysis, mainly comprised sulfate dihydrate hemihydrate. Heat treatment sample at temperature 1073 K accompanied formation anhydrous sulfate. presence reducing agent, composite material formed containing sulfide. Due content, has when heat-treated in agents, including activated carbon, wood charcoal, vegetable oil, citric acid, starch, sucrose. Conclusions Optimal technological conditions exhibiting revealed. successful synthesis phosphor without nonpretreated demonstrated. as follows: heat 1073–1173 K; isothermal holding time 60 min; agent quantity 37–50% (mol). results widely applicable wastes large-scale involving highly inorganic product.