中文摘要：

磷石膏是高浓度磷肥工业排放的固体废弃物，采用HSCChemistry5热力学计算软件对焦炭、硫磺、氢气、一氧化碳与磷石膏还原反应进行了对比分析，探索如分解温度、平衡常数、耗能与还原介质的关系。结果表明，不论采用上述何种还原介质，CaSO4还原分解成CaS均比CaO容易进行。

英文摘要：

Phosphogypsum was the solid waste discharged from the high concentration phosphate fertilizer industry. Thermodynamic calculation software HSC Chemistry 5 was used to contrast and analysis the reductive reaction of phosphogypsum with coke, sulfur, hydrogen and carbon monoxide. The relationships of reducing agent and decomposition temperature, equilibrium constant and energy consumption were explored. The results showed that with CO as reducing agent, the reducing reaction was easiest and the energy consumption was lowest; whether using the above reducing agent, it was easier for CaSO4 to be decomposed into CaS than into CaO.