Morphology control of calcium sulfate hemihydrates and application in size screening iron/sulfur of jarosite sediment

The grain size of the iron (hydr)oxides did not significantly change in the hydrothermal condition, which was favorable for separation of iron (hydr)oxides and HH crystals with the sieving method. It was reasonable (economical) to treat the mixed precipitation in the 1:2.5 ratio of solid/solution solution at 140°Cfor 2 h.