Effect of Addition of Other Acids into Butyric Acid on Selective Leaching of Zinc from Basic Oxygen Steelmaking Filter Cake

  • Jingxiu WangEmail author
  • Zhe WangEmail author
  • Zhongzhi Zhang
  • Guangqing Zhang


The selective leaching of zinc over iron from basic oxygen steelmaking (BOS) filter cake was investigated using mixtures of butyric acid with acetic and/or propionic acid, HCl, or H2SO4. The main focus was to assess the effects of other acids on the zinc and iron leaching in butyric acid. The results show that slight reduction of zinc leaching and increase in iron leaching may take place with addition of acetic and propionic acids, causing a minor decrease in the selectivity of zinc leaching over iron. Intermittent addition of H2SO4 and HCl was required to control the pH to be not less than that of pure butyric acid solution. Overall, an excellent selectivity can be maintained with the butyric acid–other acid mixtures. The results demonstrate the feasibility to use raw butyric acid without purification or waste butyric acid containing other impurity acids for leaching of zinc from the BOS filter cake to be recycled. Using high content of H2SO4 in leaching is not recommended because it has a more detrimental effect on the selectivity of zinc leaching and may cause deposition of CaSO4 in the leaching residue which may increase the SO2 or CO2 emission in later high-temperature recycling processes.



The first author wishes to gratefully acknowledge the scholarship support from the University of Wollongong (IPTA and UPA scholarships) and the China Scholarship Council (CSC). The BOS filter cake sample used in this work was supplied by BlueScope. The authors are also indebted to Dr. Linda Tie from UOW for help in ICP-OES operation.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  1. 1.School of Mechanical, Materials, Mechatronic and Biomedical EngineeringUniversity of WollongongWollongongAustralia
  2. 2.State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijingChina
  3. 3.State Key Laboratory of Heavy Oil Processing, Faculty of Chemical EngineeringChina University of PetroleumBeijingChina

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