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19卷    第12期    总第129期    2009年12月

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文章编号:1004-0609(2009)12-2243-08
高铁三水铝石型铝土矿烧结过程中氧化铝反应热力学
朱忠平,姜  涛,李光辉,黄柱成

(中南大学 资源加工与生物工程学院,长沙 410083)

摘 要: 研究了高铁三水铝石型铝土矿烧结过程中Al2O3与CaCO3、CaO、SiO2及FeO反应的热力学规律。结果表明:在1 473~1 673 K温度下,Al2O3比Fe2O3更易与CaCO3反应;Al2O3与铁酸钙(2CaO∙Fe2O3和CaO∙Fe2O3)反应不能生成3CaO∙Al2O3,当烧结温度大于1 000 K时,可以与2CaO∙Fe2O3反应生成12CaO∙7Al2O3;SiO2比Al2O3更易与CaO结合,Al2O3与SiO2直接反应生成硅酸铝的可能性较小;当烧结温度为1 473~1 673 K时,除CaO∙2Al2O3和CaO∙Al2O3不能向3CaO∙SiO2转变外,其余铝酸钙均可在SiO2的作用下向硅酸钙转变;2CaO∙Al2O3·SiO2是CaO、Al2O3和SiO2三者直接反应的产物,不能由硅酸钙和铝酸钙相互反应生成;CaO、Fe2O3、Al2O3和SiO2四元矿物存在时,烧结过程优先生成2CaO·Al2O3·SiO2和4CaO·Al2O3·Fe2O3,这与烧结实验结果相符。

 

关键字: 三水铝石; 铝土矿;铁矿石;烧结;氧化铝

Thermodynamics of reaction of alumina during sintering process of high-iron gibbsite-type bauxite
ZHU Zhong-ping, JIANG Tao, LI Guang-hui, HUANG Zhu-cheng

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract:The thermodynamics of the reactions of alumina(Al2O3) with CaCO3, CaO, SiO2 and FeO in the sintering process of high-iron gibbsite-type bauxite was investigated. The results show that alumina reacts with calcium carbonate much easier than ferri oxide(Fe2O3) at the industrial sintering temperature of 1 473−1 673 K. Alumina can not react with calcium ferrites(2CaO∙Fe2O3 and CaO∙Fe2O3) to form 3CaO∙Al2O3, but when temperature is over 1 000 K alumina reacts with 2CaO∙Fe2O3 to form 12CaO∙7Al2O3. SiO2 reacts with CaO much easier than Al2O3. The possibility of alumina silicate from direct reaction of Al­2O3 with SiO2 is little. Except for CaO∙2Al2O3 and CaO∙Al2O3, the other calcium aluminates can transform into calcium silicate by reacting with SiO2. Gehlenite(2CaO∙Al2O3∙SiO2) can not be formed from the reaction of calcium silicate(CaO∙SiO2) with calcium aluminate(CaO∙Al2O3), but it can be directly formed from the reaction of CaO, Al2O3 and SiO2. When CaO, Fe2O3, Al2O3 and SiO2 coexist in the sintering process, they are more likely to form ternary compound 2CaO·Al2O3·SiO2 and 4CaO∙Al2O3∙Fe2O3, which is consistent with the sintering results in laboratory.

 

Key words: gibbsite; bauxite; iron ore; sintering; alumina

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

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

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