A novel recirculating reactor for the leaching of magnesia by CO₂

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• 作者：Guocai Zhu ; Huajun Zhang ; Yuna Zhao
• 关键词：Leaching ; Recirculating reactor ; Reactor design ; Caustic-calcined magnesia ; CO₂
• 刊名：Hydrometallurgy
• 出版年：2008
• 期刊代码：38_0304386x
• 类别：ce
• 出版时间：June 2008
• 卷：92
• 期：3-4
• 页码：141-147
• 文件大小：606 K

摘要

A novel slurry recirculating reactor was designed to selectively leach caustic-calcined magnesia into soluble magnesium bicarbonate with CO₂ as the leaching reagent. Compared with the reactor without slurry recirculating, the leaching rate of magnesia could be enhanced by 80%–90%in this reactor. Parameters including mass concentration of the magnesia slurry, flowrate of slurry recirculating, injection rate of CO₂ and temperature were studied with respect to their effects on the leaching kinetics. A fast leaching of caustic-calcined magnesia could be achieved with a high CO₂-consuming efficiency of 65–70%in this reactor.