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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。
Thermodynamic study on the formation of low-melting Na2SO4-Fe2 (SO4) 3 binary molten sulfate was carried out by equilibrating Fe2O3-Na2SO4 with different partial pressures of SO3. The molar content of Fe 2 (SO 4) 3 in molten Na_2SO_4-Fe_2 (SO_4) _3 was determined experimentally. The free enthalpy change ΔG ° (T) = - 116830 + 141.15T of reaction Fe_2O_3 + 3SO_3 = Fe_2 (SO_4) _3 (1) dissolved in the liquid phase Na_2SO_4 was calculated and approximated by appropriately mixing Temkin random mixed model and regular solution. cal / mol (943 ~ 1003K). Based on this result and the phase diagram of Na_2SO_4-Fe_2 (SO_4) _3, the critical Pso_3 required for the formation of liquid phase Na_2SO_4-Fe_2 (SO_4) _3 was estimated and verified by experiments. Due to the lack of necessary thermodynamic data, the critical Pso_3 value for the formation of K_2SO_4-Na_2SO_4-Fe_2 (SO_4) _3 was determined experimentally.