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24卷    第6期    总第183期    2014年6月

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文章编号:1004-0609(2014)06-1629-08
熔池熔炼中金属硫酸盐分解过程的热力学研究
刘 群1,谭 军1,刘常青1,尹周澜1,陈启元1,廖 舟2,谢富春1,张平民1

(1. 中南大学 化学化工学院,有色金属资源化学教育部重点实验室,长沙 410083;
2. 株洲冶炼集团股份有限公司,株洲 412000
)

摘 要: 利用化学反应的标准平衡常数求得冶炼废渣熔池熔炼过程中5种金属硫酸盐(FeSO4, In2(SO4)3, Fe2(SO4)3, ZnSO4, PbSO4)的分解压,确定硫酸盐在高温下发生分解反应的温度;采用热重(TG)及差示扫描量热(DSC)分析各金属硫酸盐的分解过程,验证热力学计算结果。结果表明,5种硫酸盐发生分解反应由易到难的顺序为FeSO4、In2(SO4)3、Fe2(SO4)3、ZnSO4、PbSO4;热力学计算得到的相变温度、分解温度与DSC曲线吸热峰位置、TG曲线质量损失阶段相吻合,且理论计算温度比TG-DSC测定温度低7.5~283.1 K;熔炼炉温度达到1316.1 K以上可使浸锌渣、沉铁渣中的硫酸盐分解脱硫较彻底。

 

关键字: 冶炼废渣;金属硫酸盐;熔池熔炼;热力学计算

Thermodynamic study of metal sulfate decomposition process in bath smelting
LIU Qun1, TAN Jun1, LIU Chang-qing1, YIN Zhou-lan1, CHEN Qi-yuan1, LIAO Zhou2, XIE Fu-chun1, ZHANG Ping-min1

1. Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education,
School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Zhuzhou Smelter Group Co., Ltd., Zhuzhou 412000, China

Abstract:The decomposition pressures of five metal sulfates (FeSO4, In2(SO4)3, Fe2(SO4)3, ZnSO4, PbSO4) in smelting slag were calculated with the standard equilibrium constants of related chemical reactions and the sulfate decomposition temperatures were obtained by the pressures. The metal sulfates decomposition was investigated through thermogravimetric (TG) and differential scanning calorimetry (DSC), and the TG-DSC analysis confirmed the results of thermodynamic calculation. The results show that the ability of metal sulfate decomposition can be ordered as follows (from easy to difficult): FeSO4, In2(SO4)3, Fe2(SO4)3, ZnSO4, PbSO4. The phase transition and decomposition temperatures from thermodynamic calculation are consistent with TG-DSC results. The calculated temperatures are lower than those from TG-DSC, and the difference is from 7.5 to 283.1 K. The sulfates in zinc leaching residue and iron sinking slag will decompose more thoroughly when the furnace temperature is above 1316.1 K.

 

Key words: smelting slag; metal sulfates; bath smelting; thermodynamic calculation

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

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

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