Preparation of ZnSO<sub>4</sub>·7H<sub>2</sub>O and Separation of Zinc from Blast Furnace Sludge by Leaching-Purification-Crystallization Method
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- Li Bo
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology
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- Wei Yonggang
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology
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- Wang Hua
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology
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- Yang Yindong
- Department of Materials Science and Engineering, University of Toronto
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- Yin Yungui
- State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology
抄録
<p>Blast furnace sludge (BFS) is an industrial waste generated during ironmaking, which contains approximately 10% Zn, 25% Fe and 24% C and is a valuable secondary resource of zinc. In this study, ZnSO4·7H2O was produced using BFS by the combination of acid leaching, iron and calcium precipitation, concentration and crystallization. The effects of different factors and operation steps on zinc recovery were investigated, and the optimum parameters of the treatment process were obtained as follows: Acid leaching was carried out at 60°C for 10 min using sulfuric acid with the concentration of 150 g/L and a liquid to solid ratio at 3 mL/g; Iron precipitation was performed at 25°C using the liquid solution with pH value in a range of 4.0–4.4 and the H2O2 dosage of 60 mL/L; Calcium precipitation was conducted at 60°C for 40 min with the ZnF2 dosage of 7.5 g/L. The recovery efficiency of zinc was approximately 95% and the purity of ZnSO4·7H2O in the product reached 99.57%. The obtained results indicate that the proposed process in this work can successfully recover Zn from BFS with high efficiency and short production route.</p>
収録刊行物
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- ISIJ International
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ISIJ International 59 (1), 201-207, 2019-01-15
一般社団法人 日本鉄鋼協会
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詳細情報 詳細情報について
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- CRID
- 1390282763089367040
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- NII論文ID
- 130007580282
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- ISSN
- 13475460
- 09151559
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可