Reductive decomposition of phosphogypsum utilizing hydrogen in Vibro-Fluidized bed

The reductive decomposition of phosphogypsum utilizing hydrogen was studied in Vibro-Fluidized bed.Kinetics effecting factors of concentration of hydrogen,reaction temperature,gas flow,amplitude to diameter rate(H0/D) and reaction time were investigated respectively.The results show that the decomposition rate rises with the increase of the concentration of hydrogen,but the desulfurization rate rises first then decreases;the rate of decomposition and desulfurization rate can be promoted by increasing the reaction temperature and decreasing the H0/D;a lower or higher gas flow cannot improve the reductive decomposition of phosphogypsum.In general,the longer of the reaction time,the higher of the decomposition and desulfurization rate within a certain range.While the opital conditions of reductive decompostiton are the temperature of 1 050 ℃,5% of H2,H0/D of 1.2,gas flow of 242 mL/min(u=20 umf) and 60 min of reaction time,the decomposition and desulfurization rates are 98.78% and 84.24% respectively.The results meet the demand of producing acid lime with cement,and have important significations for studying the new process of reductive decomposition of phosphogypsum.