Taking the application of phosphogypsum as study objective,the impact of water-soluble phosphorus,water-soluble fluorine,and eutectic phosphorus on the physical and mechanical properties of gypsum blocks is studied through incorporating phosphoric acid,fluorosilicic acid,hydrofluoric acid,and calcium hydrogen phosphate,respectively into natural gypsum.The findings reveal that both water-soluble phosphorus and eutectic phosphorus slow the setting time of gypsum blocks,and weaken mechanical properties with increasing dosages.The impact of eutectic phosphorus is less pronounced than that of water-soluble phosphorus.Water-soluble fluorine reduces both the setting time and mechanical properties of the blocks.The combined effect of water-soluble phosphorus and water-soluble fluorine accelerates the setting process of gypsum blocks.The optimal mechanical properties of gypsum blocks are achieved when the combined mass fraction of water-soluble phosphorus and fluorine is at 0.15％.As the mass fraction of water-soluble phosphorus and fluorine increases,there is a precipitous decline in both flexural and compressive strength.As water-soluble phosphorus and fluorine are added into gypsum containing 0.2％eutectic phosphorus,which results in a prolonged setting time and diminished mechanical properties because part of eutectic phosphorus converts to water-soluble phosphorus during the hydration process.
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