Preparation of anhydrous from red gypsum and effect of high strength gypsum on its properties

Red gypsum waste comes from titanium dioxide production by sulphuric acid method. Anhydrite was prepared from the waste. The effects of calcined temperature on the properties of anhydrite were studied. The normal consistency of anhydrite decreased with the increase of calcined temperature, while the compressive strength firstly increase and then decrease. The effect of high strength gypsum on the properties of anhydrite was also studied. The normal consistency of sample decreased with the increase of high strength gypsum content, while the setting time firstly decrease and then increase, strength and density increased.

Automated summary

This study investigated the effects of calcined temperature and high strength gypsum on the properties of anhydrite. It was found that the normal consistency of anhydrite decreased with increasing calcined temperature and high strength gypsum content, while the strength and density increased.