Experimental study on preparation of anhydrite powder from desulfurized gypsum
Process test on the preparation of anhydrite powder at low temperature and normal pressure was carried out with desulfurized gypsum as raw material and sulfuric acid as additive.The optimum process conditions for the preparation of anhydrite powder were determined by single factor test.The effects of different sulfuric acid concentra-tion,liquid-solid ratio,reaction temperature and reaction time on the phase of the obtained product were investigated,and the recycling of the filtrate was discussed.The results show that long columnar anhydrite powder can be prepared under the conditions of sulfuric acid concentration of 8.5 mol/L,liquid-solid ratio of 10∶1,reaction temperature of 30℃and reaction time of 60 min without adding any crystal form control agent.By adding calcium carbonate,the recy-cling of sulfate in the filtrate was successfully achieved.The research results provide the new technical path for the high-value utilization of desulfurization gypsum.
desulfurization gypsumsulfuric acidanhydrite powderdissolution-crystallizationfiltratesingle factor test
万方数据
维普
