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.
Extractability of zinc from two types of electric arc furnace (EAF) dustscontaining 24.8% and 16.8% of zinc respectively (denoted as Sample A and Sample B) were tested usingdirect 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 ofiron in the dusts. The higher iron content, the lower extraction of zinc is obtained. 53% and 38% ofzinc can be extracted when both dusts were directly contacted with 5 mol·L^(-1) NaOH solution for42 h. The remaining zinc left in the leaching residues, which supposed to be present as zincferrites, can be further leached when the residues were fused with caustic soda. Quantitativeextraction of zinc can be obtained from the leaching residue of Sample A while only 85% from SampleB. The extractability of zinc from dusts with various contents of iron is compared. The productionflowsheet for zinc from the dusts using the process proposed is discussed.
