Dry mechanochemical conversion of SrSO4 to SrCO3

Abstract The effect of milling time on the dry conversion of celestite, SrSO 4 , to SrCO 3 using sodium carbonate in a planetary type ball mill was investigated. After milling, the powders were leached in distilled water at room temperature and the solids then washed with 1 N HCl to separate the products. X-Ray diffraction analysis showed that SrSO 4 started to transform to SrCO 3 within 10 min of milling and the extent of conversion increased with milling time reaching >90% after 30 min. A 3 was obtained in 30 min by increasing the molar ratio of Na 2 CO 3 :SrSO 4 to 1.3:1.