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首页> 外文期刊>ISIJ international >Preparation of ZnSO4·7H2O and Separation of Zinc from Blast Furnace Sludge by Leaching-Purification-Crystallization Method
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Preparation of ZnSO4·7H2O and Separation of Zinc from Blast Furnace Sludge by Leaching-Purification-Crystallization Method

机译：沥滤-纯化-结晶法制备ZnSO 4 ·7H 2 O及从高炉污泥中分离锌

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摘要

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, ZnSO_(4)·7H_(2)O 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 H_(2)O_(2) dosage of 60 mL/L; Calcium precipitation was conducted at 60°C for 40 min with the ZnF_(2) dosage of 7.5 g/L. The recovery efficiency of zinc was approximately 95% and the purity of ZnSO_(4)·7H_(2)O 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.
机译：高炉污泥（BFS）是炼铁过程中产生的工业废料，其中含有约10％的Zn，25％的Fe和24％的C，并且是宝贵的锌二次资源。在本研究中，通过酸浸，铁和钙沉淀，浓缩和结晶相结合，利用BFS制备了ZnSO_（4）·7H_（2）O。研究了不同因素和操作步骤对锌回收率的影响，得到了最佳的工艺参数：硫酸的浸出是在60℃下用浓度为150 g / L的硫酸进行10分钟酸浸。液固比为3mL / g;铁的沉淀是在25°C下使用pH值在4.0-4.4和H_（2）O_（2）剂量为60 mL / L的液体溶液进行的;在ZnF_（2）剂量为7.5 g / L的情况下，于60°C进行40分钟的钙沉淀。锌的回收率约为95％，产品中ZnSO_（4）·7H_（2）O的纯度达到99.57％。所得结果表明，所提出的工艺可以高效，快速地从BFS中回收锌。

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