Enriching and Separating Iron Impurity from Galvanizing Dross by Super-Gravity Technology

  • Anjun Shi
  • Zhe WangEmail author
  • Lei Guo
  • Ning Zhang
  • Zhancheng GuoEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Hot-dip galvanizing dross is a valuable by-product and contains high levels of zinc and some iron impurities. In this work, the super-gravity technology was applied to removing iron impurities from an industrial galvanizing dross. Firstly, the enriching behaviour of iron phase was investigated in different super-gravity fields. The floatation movement of iron phase was greatly intensified by super gravity, leading to an iron-rich layer in the top area of the sample. Then, the separation of iron impurity from galvanizing dross was further carried out via filtration enhanced by super gravity. The majority of the iron impurities were retained in the upper residue by a filter felt, with the filtered zinc purified significantly. The efficiency of separating increased with increasing gravity coefficient (G). At G = 600, about 99.2 wt% iron was removed and the filtered zinc with a purity of about 99.9 wt% can be directly used as galvanizing zinc.


Galvanizing dross Super gravity Iron removal Zinc recovery 



This work was supported by the National Natural Science Foundation of China (No. 51704022), the Fundamental Research Funds for the Central Universities (FRF-TP-16-036A1) and the project of State Key Laboratory of Advanced Metallurgy (41617002).


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology BeijingBeijingChina

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