铝电解用NiFe2O4尖晶石基惰性阳极

采用高温固相合成法制备铝电解用NiFe2O4尖晶石基惰性阳极,利用球形模型研究了烧结时气孔的变化规律,并研究了烧结温度对其微观形貌和基本物理性能的影响.结果表明:烧结温度能显著改变NiFe2O4尖晶石基惰性阳极的性能;Fe2O3与NiO的反应属于自发反应,从热力学角度讲,该反应在常温下就可进行,而升高温度是为了满足动力学条件;当烧结温度从1150℃升高至1400℃,气孔率由30.41%降低到1.72%,抗弯强度由14.62MPa增加至71.94MPa.

NiFe2O4 Spinel Based Inert Anode for Aluminum Electrolysis

NiFe2O4 spinel based inert anode was prepared for aluminum electrolysis via solid-state reaction sintering, and the variation of porosity in sintering process was investigated by spherical model to explore the effects of sintering temperature on the micromorphology, porosity and bending strength of the anode. The results showed that sintering temperature can significantly improve the performance of the inert anode, and the reaction between Fe2O3 and NiO belongs to the spontaneous reaction which may be carried out at room temperature in view of thermodynamics and the temperature elevating is just to meet the kinetic conditions for reactions. The porosity of the specimens decreases from 30.41% to 1.72% and the bending strength increases from 14.62 to 71.94 MPa when the temperature increases from 1150 to 1400°C.