Reaction mechanism between ferric bauxite and soda lime in reduction atmosphere

Wen-tao Hu, Huajun Wang, Chuan-yao Sun, Yang He, Chunlin Ji, C. Wang, Hongdong Yu
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引用次数: 2

Abstract

In response to ferric bauxite comprehensive utilization challenge,both the interaction between the ore and soda-lime,and the interaction between soda ash and lime in heat preservation progress were investigated.The study showed,in reduction atmosphere,most Fe2O3 in ore was reduced to iron,only a small part of Al2O3 was converted into sodium aluminate,the others still existed in forms of sodium aluminosilicate or corundum rather than sodium aluminate,leading to low dissolution rate of Na2O and Al2O3.This is because of the low activity of CaO,the Na2O and Al2O3 in sodium aluminosilicate can not be completely displaced.For the dilution effect of low active lime,the relative content of soda ash reduced.So the interaction between ferric bauxite and soda ash was weakened.
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铁铝土矿与碱石灰在还原气氛下的反应机理
针对铁铝土矿综合利用面临的挑战,研究了矿石与钠石灰的相互作用,以及钠灰与石灰在保温过程中的相互作用。研究表明,在还原气氛下,矿石中的大部分Fe2O3被还原为铁,只有少部分Al2O3转化为铝酸钠,其余仍以铝硅酸钠或刚玉的形式存在,而不是铝酸钠,导致Na2O和Al2O3的溶解速率较低。这是由于CaO活性低,硅酸铝钠中的Na2O和Al2O3不能完全置换所致。由于低活性石灰的稀释作用,降低了纯碱的相对含量。因此,铁质铝土矿与纯碱的相互作用减弱。
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来源期刊
哈尔滨工程大学学报
哈尔滨工程大学学报 Energy-Nuclear Energy and Engineering
CiteScore
0.90
自引率
0.00%
发文量
6802
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