Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第6期    总第231期    2018年6月

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文章编号:1004-0609(2018)-06-1225-08
钠硅渣在氧化铝熟料烧结过程中的物相变化
李小斌1,刘井辉1,王一霖1,曾 璐2,彭志宏1,刘桂华1,周秋生1,齐天贵1

(1. 中南大学 冶金与环境学院,长沙 410083; 2. 中国恩菲工程技术有限公司,北京 100038)

摘 要: 结合相关热力学计算结果,推测钠硅渣在氧化铝熟料烧结法处理过程中存在的多级反应及其产物组成,并通过研究钠硅渣在不同条件下的反应行为,验证中间相Na2-xAl2-xSixO4的存在及其溶出性能的差异。结果表明:在烧结过程中,硅系数x为0、0.05、0.25、0.35、0.45、0.55、0.85的Na2-xAl2-xSixO4均可以生成;烧结产物组成形态受反应温度和生料配比影响;当配钙比为2、烧结温度由750 ℃升高至1200 ℃时,或当配钙比由1.0升高至2.5、温度为900 ℃时,反应产物的硅系数x均可由0.85逐渐下降至0;硅系数决定反应产物的溶出性能,当x≤0.25时,Na2-xAl2-xSixO4中间相可以溶解于铝酸钠溶液。

 

关键字: 烧结法;钠硅渣;石灰;硅系数

Phase transformation of sodium hydrate alumino-silicate in alumina sintering process
LI Xiao-bin1, LIU Jing-hui1, WANG Yi-lin1, ZENG Lu2, PENG Zhi-hong1, LIU Gui-hua1, ZHOU Qiu-sheng1, QI Tian-gui1

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China; 2. The China ENFI Engineering Co., Ltd., Beijing 100038, China

Abstract:According to the thermodynamic calculation, the multistage reaction and the product composition of sodium hydrate alumino-silicate were proposed in alumina sintering process. The presence of Na2-xAl2-xSixO4 and the differences of dissolution performance were confirmed by the reactions of sodium hydrate alumino-silicate under different conditions. The results show that all the Na2-xAl2-xSixO4 (x=0, 0.05, 0.25, 0.35, 0.45, 0.55, 0.85) can be formed in the alumina sintering process. And the composition of sintering products were influenced by sintering temperature and raw material proportioning. The silicon coefficient (x) of Na2-xAl2-xSixO4 can reduce from 0.85 to 0 gradually with the sintering temperature ranging from 750 ℃ to 1200 ℃ (mole ratio of CaO to SiO2 is 2), or the mole ratio of CaO to SiO2 increasing from 1 to 2.5 (sintering temperature 900 ℃). The dissolution performance of Na2-xAl2-xSixO4 was determined by the silicon coefficient (x), and the Na2-xAl2-xSixO4 can be dissolved in sodium aluminate solution with x≤0.25.

 

Key words: sintering; sodium hydrate alumino-silicate; lime; silicon coefficient

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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