期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：267
期号：3
页码：1-7
DOI：10.1088/1755-1315/267/3/032077
出版社：IOP Publishing
摘要：The reaction of phosphogypsum (PG) and lignite is complex, which depends on the reaction conditions and atmosphere. In the paper, it was carried out for reduction decomposition of PG to calcium sulfide under N2 atmosphere. Scanning electron microscopy and XRD were used to analyze the raw–material and decomposition solid production. The reaction mechanism of preparing CaS from PG with lignite were analyzed by Factsage 6.1 and thermodynamic analysis. The results indicated that the decomposition reaction temperature were between 800 °C and 1100 °C. These experimental conditions were also studied on Ca/C molar ratio, reaction temperature and reaction time in the N2 atmosphere. The results showed that the optimal result for production of CaS are found to be a lignite to CaSO4 molar ratio of 2.4 to 1, a temperature of 900-1000°C in reductive atmosphere. Under these conditions the conversion rate of CaS from phosphogypsum amount to no less than 97.3%.
