Experimental Study on the Removal of Fe2+ and Mn2+ from Zinc Sulfate Water by Micro-nano Ozonation
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摘要:
硫酸锌生产过程中，铁锰的存在会对硫酸锌生产结晶工艺造成不利影响，降低MgSO4·7H2O的产品纯度。传统化学处理方法成本较高且易引入新的杂质离子，为获得高质量硫酸锌，开发新的铁锰去除工艺十分重要。本实验采用微纳米气泡和臭氧氧化相结合技术，探究了不同气源、温度、CaCO3投加方式与投加量等条件因素对Fe2+、Mn2+氧化效果的影响，分析该技术在实际生产应用中的可行性。实验结果表明：以臭氧为气源，铁锰去除率达99.5 %，远大于以空气和氧气为气源；温度升高会影响微纳米气泡稳定性与臭氧溶解度，不利于Fe2+、Mn2+的氧化，最高温度18℃时，Mn2+的处理时长相对24℃时缩短了12.5%；CaCO3的投加较大幅度提高了微纳米臭氧除铁锰效率，每15 min以0.44 g/L相对用量投加CaCO3时，CaCO3有效投加总量为17.6 g，铁锰完全去除耗时约50 min，相对于不投加CaCO3时处理时长缩短了33%。间歇式投加效果优于一次性投加，消耗的CaCO3量更少。
Abstract:In the production process of zinc sulfate, the presence of Fe and Mn had an adverse effect on the crystallization process of zinc sulfate production and reduce the purity of MgSO4·7H2O. Traditional chemical treatment methods are costly and easy to introduce new impurity ions. To obtain high-quality zinc sulfate, it is essential to develop a new Fe2+ and Mn2+ removal process. In this experiment, micro-nano bubble and ozone oxidation combined technology was used to explore the influence of different gas sources, temperature, CaCO3 dosage method and dosage on the oxidation effect of Fe2+ and Mn2+, and to analyze the feasibility of the technology in a practical production application. Results showed that the removal rate of Fe2+ and Mn2+ was more than 99.5% with ozone as the gas source, which was much higher than that with air and oxygen as the gas source. The increase of temperature had an effect on the stability of micro and nano bubbles and the solubility of ozone, which was not conducive to the oxidation of Fe2+ and Mn2+. The treatment time of Mn2+ at the maximum temperature of 18℃ was shortened by 12.5% compared with that at 24℃. The addition of CaCO3 significantly improved the removal efficiency of Fe2+ and Mn2+ by micro-nano ozone. When the relative dosage of 0.44 g/L CaCO3 was added every 15 min, the adequate total amount of CaCO3 was 17.6 g, and the complete Removal of Fe2+ and Mn2+ took about 50 min, which shortened the treatment time by 33% compared with the treatment time without CaCO3. Effect of intermittent dosing was better than that of one-time dosing, and the amount of CaCO3 consumed was more petite.
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Key words:
- Micro-nano bubble /
- Ozonation /
- Iron manganese removal /
- Calcium carbonate
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表 1 原液中主要成分含量
Table 1. Content of main components in the stock solution
成分 Fe2+ Mn2+ Zn2+ Cr3+ 含量/（mg·L-1） 180 530 5×104 50 
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