Experimental Study on Leaching of High-iron Zinc Calcine
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摘要:
高铁锌焙砂浸Zn时也会引起杂质Fe的溶出，影响后续生产，增加经济成本。针对这一问题，以某企业的锌焙砂为研究对象，通过对搅拌速度、浸出时间、初始酸度、浸出温度等进行研究，分析影响Zn和Fe浸出率的因素，优化浸出工艺，从而提高Zn的浸出率，降低Fe的浸出率。结果表明，在浸出温度60℃、初始硫酸质量浓度120 g/L、液固体积质量比10：1、搅拌速度500 r/min、浸出时间60 min条件下，可以得到较高的Zn浸出率和较低的Fe浸出率，此时Zn的浸出率为88.5%，Fe的浸出率为10.3%。
Abstract:During the leaching of high-iron zinc calcine, the leaching of Zn will also lead to the dissolution of impurity Fe, affecting subsequent production and increasing economic costs. To solve this problem, the zinc calcine from an enterprise was taken as the research object. Through the study of The factors affecting the leaching rates of Zn and Fe such as stirring speed, leaching time, initial acidity and leaching temperature were analyzed. The leaching process was optimized. So as to improve the leaching rate of Zn and reduce the leaching rate of Fe. The results showed that under the conditions of leaching temperature of 60 ℃, initial sulfuric acid concentration of 120 g/L, liquid-solid mass ratio of 10:1, stirring speed of 500 r/min and leaching time of 60 min, higher Zn leaching rate and lower Fe leaching rate could be obtained. At this time the Zn leaching rate was 88.5%, and the Fe leaching rate was 10.3%.
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Key words:
- zinc calcine /
- zinc hydrometallurgy /
- leaching
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表 1 锌焙砂主要化学成分
Table 1. The main chemical constituents of zinc calcine
成分 Zn Fe2O3 SiO2 CaO Cu Al2O3 SO3 Mn Sb MgO Sn Pb 含量/% 61 31 3.3 1.1 0.9 0.7 0.6 0.5 0.1 0.1 0.1 0.07 
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表 2 锌焙砂粒度分析
Table 2. The size analysis of zinc calcine
粒度/μm < 10 10~52 52~104 104~158 > 158 体积/% 3.98 34.03 47.59 13.44 0.96
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