where Hcr-CS,I is the enthalpy of this reaction.
Finally, at temperatures near 1250 ◦C, the gypsum mass is
further reduced due to the decomposition of insoluble calcium sulphate
anhydrite I [18]:
CaSO4(s) → CaO(s) + SO2(g) + (1/2)O2(g) − Hdc-CS (2.9)
where Hdc-CS is the enthalpy of this reaction.
2