杜冬云,梅 颖,于 宸,薛余化,叶恒朋.CO2回收电解锰渣中可溶性锰的结晶动力学[J].中南民族大学学报自然科学版,2017,(3):1-5
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
  
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资助项目(2015BAB01B03)
作者单位
杜冬云,梅 颖,于 宸,薛余化,叶恒朋 中南民族大学 资源与环境学院, 环境科学与工程研究所催化材料科学国家民委-教育部共建重点实验室 武汉430074 
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中文摘要:
      为研究利用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:
      Aiming for the research of crystallization mechanism on recovering soluble manganese from electrolytic manganese residue(EMR) using CO2, this paper analyzed the nucleation and growth characteristics of manganese carbonate crystals under different temperature conditions by Avrami-Erofeev isothermal crystallization kinetics model. The results showed that the apparent activation energy of manganese carbonate in EMR backwashing leachate during crystalline nucleation and crystal growth phases was 42.82 kJ·mol-1 and 61.15 kJ·mol-1 respectively , under the condition of initial manganese concentration of 2.5 g·L-1, pH 6.6, CO2 volume ratio and flow rate of 15% and 0.4 L·min-1, stirring speed of 600 r·min-1. The manganese can form into carbonate at a temperature of 318 K for 120 min with the recovery rate of up to 99.98%,whose backwashing leachate met the first level of total manganese emission standards in “Integrated Wastewater Discharge Standard” (GB8978-1996).
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