Na_2SO_4-Fe_2(SO_4)_3、K_2SO_4-Na_2SO_4-Fe_2(SO_4)_3熔体的生成热力学

中国腐蚀与防护学报

1992, Vol. 12

Issue (1): 20-26

研究报告

本期目录 | 过刊浏览

Na_2SO_4-Fe_2(SO_4)_3、K_2SO_4-Na_2SO_4-Fe_2(SO_4)_3熔体的生成热力学

张允书;史良权;石声泰

中国科学院上海冶金研究所;中国科学院上海冶金研究所;中国科学院上海冶金研究所

THERMODYNAMICS OF MOLTEN Na_2SO_4-Fe_2(SO_4)_3 AND K_2SO_4-Na_2SO_4-Fe_2(SO_4)_3 SYSTEMS

Zhang Yunshu; Shi Liangquan; and Shih Shengtai (Shanghai Institute of Metallurgy;Academia Sinica)

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摘要: 通过使Fe_2O_3-Na_2SO_4与不同分压的SO_3建立平衡,对低熔点Na_2SO_4-Fe_2(SO_4)_3二元熔融硫酸盐的形成进行热力学研究。实验确定了在熔融Na_2SO_4-Fe_2(SO_4)_3中平衡Fe_2(SO_4)_3的摩尔含量。用Temkin随机混合模型和规则溶液近似并加以适当修正,计算了反应Fe_2O_3+3SO_3=Fe_2(SO_4)_3(1,溶于液相Na_2SO_4)的自由焓变化 ΔG°(T)=—116830+141.15T cal/mol(943～1003K) 用这一结果并借助于Na_2SO_4-Fe_2(SO_4)_3系相图估算了形成液相Na_2SO_4-Fe_2(SO_4)_3所需临界Pso_3,并用实验加以检验。由于缺少必要的热力学数据,形成液相K_2SO_4-Na_2SO_4-Fe_2(SO_4)_3的临界Pso_3值则是用实验确定的。

Abstract：Thermodynamic study of the formation of low melting-point Na_2SO_4-Fe_2 (SO_4)_3 was made by equilibrating Fe_2O_3-Na_2SO_4 mixtures with SO_3 of different pressures in the temperature range of 943-1003K. The molar fractions of Fe_2(SO_4)_3 in the molten Na_2SO_4Fe_2(SO_4)_3 were determined by chemical analysis. With the data obtained, the free enthalpy change for the reaction Fe_2O_3 (s)+3SO_3 (g)=Fe_2(SO_4)_3 (1, dissolved in liquid Na_2SO_4)was calculated by means of regular solution approximation as well as Temkin mixing model. The calculated △G°is given as △G°=-116830+141.15T,cal/mol (943～1003K) This was used to estimate the critical partial pressures of SO_3 required for liquid sulfate formation, with the help of the Na_2SO_4-Fe_2(SO_4)_3 phase diagram. For lack of necessary thermodynamic data, the critical partial pressures of SO_3 required for the formation of molten K_2SO_4-Na_2SO_4-Fe_2(SO_4)_3 were determined experimentally.

收稿日期: 1992-02-25

基金资助:中国科学院腐蚀科学开放研究实验室课题;;国家自然科学基金

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引用本文:

张允书;史良权;石声泰. Na_2SO_4-Fe_2(SO_4)_3、K_2SO_4-Na_2SO_4-Fe_2(SO_4)_3熔体的生成热力学[J]. 中国腐蚀与防护学报, 1992, 12(1): 20-26.
. THERMODYNAMICS OF MOLTEN Na_2SO_4-Fe_2(SO_4)_3 AND K_2SO_4-Na_2SO_4-Fe_2(SO_4)_3 SYSTEMS. J Chin Soc Corr Pro, 1992, 12(1): 20-26.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1992/V12/I1/20

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