1. Conversion of phosphogypsum to potassium sulfate. Part 1. The effect of temperature on the solubility of calcium sulfate in concentrated aqueous chloride solutions;Aagli;J. Therm. Anal. Calorim.,2005
2. Standard D2798-11a. Standard test method for microscopical determination of the vitrinite reflectance of coal;ASTM,2011
3. Standard D3172–13. Standard practice for proximate analysis of coal and coke;ASTM,2013
4. Standard test method for microscopical determination of the maceral composition of coal;ASTM,2013
5. Standard D4239–14. Standard test methods for sulfur in the analysis sample of coal and coke using high-temperature tube furnace combustion methods;ASTM,2014