Novel Process for Alumina Extraction via the Coupling Treatment of Coal Gangue and Bauxite Red Mud

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• 作者：Yanxia Guo ; Qian Zhao ; Kezhou Yan ; Fangqin Cheng ; Helen H. Lou
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：March 19, 2014
• 年：2014
• 卷：53
• 期：11
• 页码：4518-4521
• 全文大小：207K
• 年卷期：v.53,no.11(March 19, 2014)
• ISSN：1520-5045

文摘

A novel process for the coupling treatment of coal gangue and red mud is reported. Red mud containing 23.4% Al₂O₃, 19.1% SiO₂, and 9.4% Na₂O by weight was used as the blended ingredients of coal gangue for alumina extraction. Calcination of coal gangue with the addition of Na₂CO₃ at 850 掳C could obtain more than 90% of Al₂O₃ extraction. Nevertheless, the high consumption of Na₂CO₃ is equivalent to the same weight amount of coal gangue. Both nepheline and sodium aluminum silicate formed during the process have the molecular structure of NaAlSiO₄. The 1:1:1 of the theory molar ratio of Na, Al, and Si suggested that the minimum consumption of Na₂CO₃ might be obtained at the optimal Al/Si molar ratio of 1:1. Red mud with an Al/Si molar ratio of 1.44 mixed with coal gangue with a ratio of 0.64 was used to extract alumina. The results showed that red mud could adjust the Al/Si molar ratio of coal gangue to an appropriate value and Na₂O in red mud was also used to partly substitute for Na₂CO₃ required for coal gangue activation, which consequently decreased the consumption of Na₂CO₃ from 100% to 12.1鈥?0.5%.