CO2回收电解锰渣中可溶性锰的结晶动力学
Crystallization kinetics of recovering soluble manganese from electrolytic manganese residue by carbon dioxide
投稿时间:2017-03-13  最后修改时间:2017-03-22
DOI:
中文关键词: 电解锰渣  二氧化碳  碳酸锰  结晶动力学
英文关键词: electrolytic manganese residue(EMR)  carbon dioxide  manganese carbonate  crystallization kinetics
基金项目:国家科技支撑计划课题(2015BAB01B03)
作者单位E-mail
杜冬云 中南民族大学资源与环境学院 yingmei2088@126.com 
梅颖 中南民族大学资源与环境学院  
于宸 中南民族大学资源与环境学院  
薛余化 中南民族大学资源与环境学院  
叶恒朋 中南民族大学资源与环境学院  
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中文摘要:
      为研究了利用CO2从电解锰渣中回收可溶性锰的结晶机理,采用Avrami-Erofeev等温结晶动力学模型分析了在不同温度条件下碳酸锰晶体的成核和生长特性.结果表明:在初始锰浓度 2.5 g?L-1、pH 6.6、φ(CO2)= 15%、CO2流量 0.4 L?min-1、搅拌速率 600 r?min-1的条件下,电解锰渣反洗液中碳酸锰晶核生成和晶体生长阶段的表观活化能分别为42.82 kJ?mol-1和61.15 kJ?mol-1。在温度为318 K反应120 min时,锰通过形成碳酸盐,回收率可达99.98%,锰渣反洗液符合《污水综合排放标准》(GB8978-1996)中总锰的一级排放标准.
英文摘要:
      To study the crystallization mechanism of recovering soluble manganese from electrolytic manganese residue(EMR) by carbon dioxide, crystalline nucleation and growth character of manganese carbonateobtained at different temperature were analyzed by the Avrami-Erofeev isothermal crystallization kinetics model. The results showed that the apparent activation energy of manganese carbonate during crystalline nucleation and crystal growth was 42.82 kJ?mol-1 and 61.15 kJ?mol-1 respectively with initial Mn2+ concentration of 2.5 g?L-1, pH of 6.6, CO2 volumn ratio of 15%, mixed gas flow of 0.4 L?min-1 and agitation speed of 600 r?min-1 in the backwashing leachate of the EMR. 99.98% manganese could be recovered by forming into carbonate after 120 min at 318 K, which met the first level of total manganese in “integrated wastewater discharge standard” (GB8978-1996).
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