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工程科学与技术:2020,52(5):250-256
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氧化锰矿浆脱除电解锰渣煅烧烟气二氧化硫工艺研究
(1.四川大学 建筑与环境学院,四川 成都 610065;2.国家烟气工程技术研究中心,四川 成都 610065)
Study on Flue Gas Desulfurization with Oxide Manganese Slurry for Electrolytic Manganese Calcining
(1.College of Architecture and Environment, Sichuan Univ., Chengdu 610065, China;2.National Eng. Research Center for Flue Gas Desulfurization, Chengdu 610065, China)
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投稿时间:2019-05-13    修订日期:2020-05-20
中文摘要: 传统的石灰石-石膏法烟气脱硫不仅运行并成本高还会产生大量的二次污染物,而氧化锰矿湿法脱硫不仅能够脱除烟气中SO2,而且同时实现矿粉中锰的浸出生成硫酸锰。结合电解锰企业生产特点,提出以氧化锰矿和电解阳极液配浆直接脱除电解锰渣煅烧烟气二氧化硫的新工艺,研究了不同工艺参数对脱硫浸锰的影响。模拟电解阳极液与氧化锰矿浆的脱硫浸锰工艺实验表明,随着脱硫时间的增加,烟气中SO2越高,脱硫率越低,锰浸出率增加,故应采用多级逆流方式实现高效脱硫和深度浸锰的目标。脱硫率随着氧化锰粒径的减小而增高,用于脱硫的锰矿粒径应小于120 目。烟气脱硫操作温度控制在50~80 ℃,液固比宜选取9∶1~6∶1。处理装置的进气流量对脱硫浸锰的效率具有较佳值,本实验装置选择2.0 m3/min。采用模拟电解阳极液对7%的模拟煅烧烟气进行的5级氧化锰浆脱硫实验表明,在液固比为9∶1,锰矿粒径为200 目,温度50 ℃前4级脱硫时间20 min,第5级100 min下,SO2出口浓度为111.4 mg/m3,锰矿浸出率为93.12%,浆液中Mn2+浓度为46.26 mg/L,连二硫酸锰浓度为4.0 g/L。本文以氧化锰矿为脱硫原料,电解阳极液配浆来直接脱硫的新工艺,集脱硫浸锰为一体,与传统的硫资源利用方式相比,投资和运行成本显著降低,具有较好的应用前景。
中文关键词: 氧化锰矿  脱硫  电解锰阳极液  浸锰
Abstract:For traditional wet limestone wet flue gas desulfurization process, excepting for high cost, a large amount of gypsum byproduct was formed, which was difficult to be reused, and resulted in many new environmental problems. However, flue gas desulfurization with oxide manganese slurry could remove SO2 and produce MnSO4 simultaneously. Based on the characteristics of electrolytic manganese industry, a new technology for sulfur dioxide recycling and removal from flue gas of electrolytic manganese residue calcination process was presented using the manganese oxide ore (raw material from electrolytic manganese industry) with anode solution of electrolytic manganese slurry, and the influences of processing parameters were investigated in the present work. The process experimental investigations on flue gas desulfurization and manganese leaching with electrolysis anode solution and manganese dioxide ore slurry indicated that as desulphurizing time increased, the higher SO2 concentration of flue gas, the lower the desulfurization efficiency was obtained, and the manganese leaching rate increased, thus multistage countercurrent mode should be adopted to realize efficient desulphurization and manganese leaching. The desulfurization rate increased with the decrease of the granule size of manganese oxide and the size of the manganese ore used for desulphurization should be less than 120 mesh. The operating temperature of flue gas desulfurization should be controlled in the range of 50~80 ℃, while the liquid-solid ratio should be in the range of 9∶1~6∶1. For different processing installations, the relative optimum inlet flow was different and for the applied experimental installation, i. e. 2.0 m3/ min. The simulation of anode solution was used to conduct 5 grade manganese oxide slurry desulfurization of the simulated 7% flue gas calcination, and the results showed that with the liquid-solid ratio at 9∶1, ore particle size at 200 mesh, the temperature at 50 ℃, the time of 4 grade desulfurization at 20 min, the outlet SO2 concentration was 111.4 mg/m3, leaching rate was 93.12%, concentration of Mn2+ was 46.26 mg/L in slurry, and concentration of MnS2O6 was 4 g/L (for fifth grade (100 min). The present work provided a new technology for sulfur dioxide recycling and removal from flue gas using the manganese oxide ore with anode solution of electrolytic manganese slurry. Compared with the traditional method of sulfur resources utilization, the cost of the present method was significantly reduced.
文章编号:201900456     中图分类号:X7    文献标志码:
基金项目:国家重点研发计划项目(2018YFC0213405)
作者简介:姚露(1988-),女,助理研究员,博士.研究方向:大气污染控制.E-mail:yaolu@scu.edu.cn
引用文本:
姚露,杨林,邹敏杰,孙冬,江霞,蒋文举.氧化锰矿浆脱除电解锰渣煅烧烟气二氧化硫工艺研究[J].工程科学与技术,2020,52(5):250-256.
YAO Lu,YANG Lin,ZOU Minjie,SUN Dong,JIANG Xia,JIANG Wenju.Study on Flue Gas Desulfurization with Oxide Manganese Slurry for Electrolytic Manganese Calcining[J].Advanced Engineering Sciences,2020,52(5):250-256.