菱铁矿磁化焙烧冷却氧化过程研究  

Study on Cooling Oxidation Process of Siderite by Magnetization Roasting

作　　者：纪振明 周廷波 高鹏[2] 李杰[2] 孙永升[2] JI Zhenming;ZHOU Tingbo;GAO Peng;LI Jie;SUN Yongsheng(Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]中冶长天国际工程有限责任公司,湖南长沙410205 [2]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《金属矿山》2024年第11期100-105,共6页Metal Mine

基　　金：国家重点研发计划项目(编号:2021YFC2902400)。

摘　　要：菱铁矿作为我国复杂难选铁矿石的代表之一,资源储量巨大。实现菱铁矿资源的有效开发利用,对我国钢铁工业的可持续发展具有重要的战略意义。在对菱铁矿开展悬浮磁化焙烧试验及冷却氧化试验基础上,通过X射线衍射分析(XRD)及振动样品磁强计(VSM)等手段重点研究了冷却氧化过程中的物相转化和磁性转变规律。结果表明:氧化温度和氧化时间对氧化过程有显著的影响,O_(2)浓度的影响较小。随着氧化温度的升高,焙烧产物的氧化程度不断加深,氧化产物饱和单位质量磁矩不断减小。在氧化温度为200℃至400℃时氧化反应剧烈,不断生成γ-Fe_(2)O_(3)和α-Fe_(2)O_(3)。焙烧产物氧化过程中,磁铁矿主要以Fe_(3)O_(4)→γ-Fe_(2)O_(3)→α-Fe_(2)O_(3)顺序发生氧化,氧化产物磁性不断减弱,氧化反应基本完成的时间为6 min。As one of the representatives of complex refractory iron ore in China,siderite possessed huge resource reserves.The effective development and utilization of siderite resources were of great strategic significance to the sustainable development of China′s iron and steel industry.Based on the experiments of suspension magnetization roasting and cooling oxidation of siderite,the phase transformation and magnetic transformation during cooling oxidation were studied by means of X-ray diffraction(XRD)and vibrating sample magnetometer(VSM).The results revealed that the oxidation temperature and time had a significant effect on the oxidation process,whereas the effect of O_(2)concentration was minimal.As the oxidation temperature increased,the oxidation degree of the roasting products deepened,and the saturated magnetic moment per unit mass of the oxidation products decreased.At 200℃to 400℃,the oxidation reaction was intense,withγ-Fe_(2)O_(3)andα-Fe_(2)O_(3)being continuously generated.During the oxidation process of the roasting products,magnetite was primarily oxidized in the sequence of Fe_(3)O_(4)→γ-Fe_(2)O_(3)→α-Fe_(2)O_(3),and the magnetic properties of the oxidation products continued to weaken.The oxidation reaction was essentially completed when the oxidation time reached 6 min.

关 键 词：菱铁矿 磁化焙烧 冷却氧化 物相转化 磁性转变 

分 类 号：TD925.7[矿业工程—选矿]