Research on the Occurrence Status and Leaching Characteristics of Heavy Metals in Desulfurization Gypsum
Taking desulfurization gypsum from coal-fired power plants as the research object,the leaching analysis of the main heavy metals in desulfurization gypsum was conducted.The leaching characteristics of heavy metals in desulfurization gypsum were investigated with different solutions.The effects of solution type,concentration,temperature,and reaction time on the leaching of heavy metals in desulfurization gypsum were investigated.The study showed that hydrochloric acid solution had a good leaching effect on heavy metals in desulfurization gypsum.Under the optimal conditions(hydrochloric acid concentration of 1.2 mol/L;reaction temperature of 60℃,reaction time of 60 min),the leaching rates of the main heavy metals were all above 50%.The leaching rates of Cu,Zn,Cr,Pb,and Cd were all above 85%,86.22%,89.25%,91.45%,91.42%,and 87.56%,respectively,which is conducive to the resource utilization of desulfurization gypsum.I have laid a good foundation.
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