| Summary: | Phosphogypsum (PG) is an industrial solid waste, and the production of CaO by CO reduction of PG can not only solve the environmental problems caused by PG, but also turn waste into treasure to generate CaO. However, the current yield of CaO production by CO reduction of PG is low. To further improve the yield of CaO, a technical method of CaO preparation by CO-H2O synergistic reduction of PG is proposed. The impacts of CO concentration, P(H2O)/P(CO) ratio and reaction temperature are examined in this work together with FactSage thermodynamic simulations in order to determine the ideal reaction conditions and reaction mechanism. It is found that the CaO yield could reach 96.78% at 1100 °C of 3% CO and P(H2O)/P(CO) of 10. The mechanism study shows that when the CO atmosphere contains H2O, the reductive decomposition of PG by CO is actually the result of the joint action of CO, H2 and CO2. Overall, this research will help to enhance a novel technological strategy for preparing CaO by decomposition of PG.
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