论文部分内容阅读
运用差示扫描量热法、采用XRD检测等手段探讨研究了Fe--Ni--O--C体系中Fe、Ni的还原行为,样品主要包括NiO+C、Fe2 O3+C、NiFe2 O4+C、NiO+Fe2 O3+C和Ni+Fe2 O3+C等5种体系.结果表明:NiO+Fe2 O3体系中由于NiFe2 O4及Fe--Ni合金的生成使得该体系被还原的反应开始温度高于纯NiO,且最大反应速率对应的温度及还原反应结束温度均高于纯NiO但低于纯Fe2O3物质;相对于NiO+Fe2O3,NiFe2O4被C还原的开始及结束温度均更高,且还原速率更小;Fe2O3被C还原可分为三个阶段,金属Ni的存在能够明显促进铁氧化物的还原,主要是促进了Fe的各种氧化物形式(Fe2O3、Fe3O4和FeO)直接向金属Fe形式的转换;数据显示C还原NiFe2O4的过程也基本可分为三个阶段,不同阶段中产物的形态和种类均存在一定差别.
The reduction behavior of Fe and Ni in Fe - Ni - O - C system was investigated by differential scanning calorimetry and XRD. The samples mainly consisted of NiO + C, Fe2O3 + C, NiFe2O4 + C, NiO + Fe 2 O 3 + C and Ni + Fe 2 O 3 + C. The results show that NiFe 2 O 4 and Fe - Ni alloys produce high reaction start temperature In pure NiO, the temperature corresponding to the maximum reaction rate and the temperature at the end of the reduction reaction are both higher than pure NiO but lower than that of the pure Fe2O3. Compared with NiO + Fe2O3, the starting and ending temperatures of NiFe2O4 are much higher than that of C, and the reduction rate Fe2O3 reduced by C can be divided into three stages, the presence of metal Ni can significantly promote the reduction of iron oxide, mainly to promote the various oxide forms of Fe (Fe2O3, Fe3O4 and FeO) directly to the metal form of Fe The data show that the process of reducing NiFe2O4 by C can basically be divided into three stages. There are some differences in the morphology and types of products in different stages.