铁酸锌配碳选择性还原的热力学分析和试验研究

Thermodynamic Analysis and Experimental Study on Selective Reduction of Zinc Ferrite with Carbon

为研究铁酸锌配碳选择性还原分解过程,通过Factsage计算和试验研究相结合,分析铁酸锌配碳还原分解的热力学过程,讨论反应温度和配碳量对铁酸锌分解行为的影响。结果显示,铁酸锌配碳还原过程遵循逐级还原规律,控制C/O摩尔比0.6以下,温度低于900℃时,可实现铁酸锌的有效分解、ZnO过还原的抑制;采用固相反应法合成了结晶度好、纯度较高的铁酸锌,800℃时铁酸锌配碳还原分解为Fe3O4和ZnO,随着温度的升高,铁氧化物的逐级还原为FeO和Fe,ZnO被还原为Zn,试验结果与热力学计算结果基本一致。

In order to selectively decompose zinc ferrite by carbon,both of the Factsage thermodynamic calculation and the test were used to analyze the thermodynamic process and decomposition characteristics of zinc ferrite,effects of reaction temperature and carbon content on the decomposition behavior of zinc ferrite were discussed.The results show that the reduction of zinc ferrite obeys a stepwise mechanism.When the C/O molar ratio is less than 0.6,and the temperature is less than 900℃,efficiency decomposition of zinc ferrite and suppression of zinc oxide over reduction can be achieved.The zinc ferrite product with high purity and high crystalline can be prepared by solid-state synthesis.Zinc ferrite is easy to be reduced to Fe3O4 and ZnO by carbon at 800℃.As the temperature increased,the gradual reduction of iron oxides was FeO and Fe,even ZnO can be reduced to zinc.And the test results agreed with the thermodynamic calculations.