Abstract The preparation of zinc sulfate is a key step in the wet zinc smelting industry and an important teaching content of inorganic chemistry experiment in university.Aiming at the problems existing in the current teaching scheme,this study optimizes the key steps such as leaching condition control and purification technology by comparing and analyzing three typical teaching schemes.(1) Acid leaching process:Heat the acid leaching solution to boiling and maintain for 25 minutes to promote the decomposition of zinc ferrite.It is recommended to delay the filtration process after the removal of iron and manganese,and use colloidal adsorption of iron hydroxide to improve the filtration efficiency.(2) Step-by-step removal of iron and manganese:First,use H2O2to oxidize Fe2+,and then add a small amount of KMnO4 to treat Mn2+,reducing the amount of oxidant and by-products.Clarify the role of ZnO in maintaining pH stability.Determine the amount of ZnO added to stabilize the pH of the system in the range of 4.8 to 5.4(the optimal range for coagulation of iron hydroxide).(3) Ni2+removal:Introduce a trace amount of copper sulfate solution and utilize the microbattery effect to improve the removal efficiency of Ni2+.
LI Yuan, ZHANG Jin-Yu, ZHANG Hang, ZENG Cheng-Hui, ZHONG Sheng-Liang. Optimization of Experimental Conditions for Preparing Zinc Sulfate from Zinc Calcine[J]. Chinese Journal of Chemical Education, 2026, 47(2): 46-53.
