Extraction of Zinc from Electric Arc Furnace Dust by Alkaline Leaching Followed by Fusion  of the Leaching Residue with Caustic Soda

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Extraction of Zinc from Electric Arc Furnace Dust by Alkaline Leaching Followed by Fusion
of the Leaching Residue with Caustic Soda

ZHAO Youcai^a,b; R.Stanforth^b

^a National Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai
200092, China
^b Laboratory of Environmental Engineering, Department of Chemical and Environmental
Engineering, National University of Singapore, Singapore 119620

Received:1900-01-01 Revised:1900-01-01 Online:2004-04-28 Published:2004-04-28
Contact: ZHAO Youcai

氢氧化钠浸取-浸取渣熔融法从炼钢厂烟尘中提取锌的研究

赵由才^a,b; R.Stanforth^b

^a National Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai
200092, China
^b Laboratory of Environmental Engineering, Department of Chemical and Environmental
Engineering, National University of Singapore, Singapore 119620

通讯作者: 赵由才

Abstract

Abstract: Extractability of zinc from two types of electric arc furnace (EAF) dusts containing 24.8%
and 16.8% of zinc respectively (denoted as Sample A and Sample B) were tested using direct
alkaline leaching followed by fusion of the resulting leaching residues with caustic soda.
The experimental results show that the extraction of zinc is heavily dependent on the
contents of iron in the dusts. The higher iron content, the lower extraction of zinc is
obtained. 53% and 38% of zinc can be extracted when both dusts were directly contacted with
5mol·L^-1 NaOH solution for 42h. The remaining zinc left in the leaching residues, which
supposed to be present as zinc ferrites, can be further leached when the residues were
fused with caustic soda. Quantitative extraction of zinc can be obtained from the leaching
residue of Sample A while only 85% from Sample B. The extractability of zinc from dusts wit
hvarious contents of iron is compared. The production flowsheet for zinc from the dusts
using the process proposed is discussed.

摘要： Extractability of zinc from two types of electric arc furnace (EAF) dusts containing 24.8%
and 16.8% of zinc respectively (denoted as Sample A and Sample B) were tested using direct
alkaline leaching followed by fusion of the resulting leaching residues with caustic soda.
The experimental results show that the extraction of zinc is heavily dependent on the
contents of iron in the dusts. The higher iron content, the lower extraction of zinc is
obtained. 53% and 38% of zinc can be extracted when both dusts were directly contacted with
5mol·L^-1 NaOH solution for 42h. The remaining zinc left in the leaching residues, which
supposed to be present as zinc ferrites, can be further leached when the residues were
fused with caustic soda. Quantitative extraction of zinc can be obtained from the leaching
residue of Sample A while only 85% from Sample B. The extractability of zinc from dusts wit
hvarious contents of iron is compared. The production flowsheet for zinc from the dusts
using the process proposed is discussed.

ZHAO Youcai, R.Stanforth. Extraction of Zinc from Electric Arc Furnace Dust by Alkaline Leaching Followed by Fusion
of the Leaching Residue with Caustic Soda
[J]. .

赵由才, R.Stanforth. 氢氧化钠浸取-浸取渣熔融法从炼钢厂烟尘中提取锌的研究[J]. CIESC Journal.