菱铁矿热处理分层现象及临界线度的研究

Study on the Stratification and Critical Size in Siderite Heattreatment

在空气环境下对菱铁矿进行热处理 ,发现其在 4 80～ 6 0 0℃温度范围内会出现分层现象。XRD分析表明 ,热处理样品的内层物质为Fe3O4,而外层物质为γ -Fe2 O3 和α -Fe2 O3。对于分层现象 ,存在 1个临界线度 ,它主要与热处理温度。

In the heat treatment of siderite in an air enviroment,siderite stratification may occur at a temperature range of 480～600℃.XRD analysis shows the sample's inner layer substance is Fe 3O 4 while the outer layer, r Fe 2O 3 and α Fe 2O 3.There exists a critical size for the stratification which is closely reated to the temperature and heat retaining time in the heat treatment and to the sample's structural characteristics.