磁化焙烧产品冷却氧化过程中的相变行为研究——菱铁矿  

Study on Phase Transition Behavior of Siderite Magnetized Roasting Products during Cooling and Oxidation

作　　者：秦彩霞[1] 孙永升[2] 陈毅琳[1] 唐晓玲[1] 朱霞丽 秦丽娜 Qin Caixia;Sun Yongsheng;Chen YiLin;Tang XiaoLing;Zhu Xiali;Qin Lina(Jiuquan Iron and Steel Group Co.,Ltd.,Jiayuguan 735100,China;School of Resources and Civil Engireering,Northeastern University,Shenyang 110819,China)

机构地区：[1]酒泉钢铁集团有限责任公司,甘肃嘉峪关735100 [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》2019年第12期79-83,共5页Metal Mine

摘　　要：磁化焙烧工艺作为处理难选铁矿资源的有效工艺,近年来在菱铁矿资源开发中的应用研究取得了巨大进展。在菱铁矿磁化焙烧的工业化生产中,焙烧产品的冷却是影响焙烧产品品质的重要环节。以西北某矿区菱铁矿为研究对象,通过拣选-强磁选-重选流程得到纯度为80.6%的菱铁矿作为试验物料进行磁化焙烧,考察了惰性气氛冷却、水淬冷却、空气气氛冷却对焙烧产品的影响,深入研究了空气气氛冷却方式下,焙烧产品在不同氧化温度、氧化时间条件下的氧化行为和相变情况。结果表明:焙烧产品在惰性气氛冷却和水淬方式冷却过程中基本不发生氧化反应;在空气冷却方式下,氧化温度和氧化时间对菱铁矿磁化焙烧产品的影响显著;在氧化温度为100℃,焙烧产品基本不发生氧化;在氧化温度高于300℃,焙烧产品开始发生明显氧化;氧化温度为500℃、氧化时间2.5 min时,焙烧产品中的磁铁矿全部被氧化。磁化焙烧产品氧化后生成α-Fe2O3和γ-Fe2O3两种铁物相,在氧化反应过程中先生成γ-Fe2O3,后生成α-Fe2O3。试验结果可以为菱铁矿磁化焙烧工艺的优化提供参考。Magnetized roasting process is an effective process for the treatment of refractory iron ore resources. In recent years, the application research in the development of siderite resources has also made great progress. In the industrial production of magnetite roasting of siderite, the cooling mode is an important part affecting the quality of the roasting products. Taking the siderite in a mining area in the northwest as the research object,a siderite with a purity of 80.6% is obtained through the sorting-high intensity magnetic-gravity separation process. The effects of inert atmosphere cooling, water quenching and air atmosphere cooling on the roasting products were investigated and the oxidation behavior and phase transition of the roasted products under different oxidation temperature and oxidation time were deeply investigated. The results showed that the cooling products were rarely oxidized in the inert atmosphere or in water cooling. In air atmosphere cooling process, the results were greatly influenced by the oxidation temperature and oxidation time. At the oxidation temperature of 100 ℃, the roasted products did not substantially oxidize. At oxidation temperatures above 300 ℃, the rosted products began to undergo significant oxidation. When the oxidation temperature is 500 ℃, the oxidation time is 2.5 min, the magnetite in the roasted products were completely oxidized. The magnetized roasting products were oxidized to α-Fe2O3 and γ-Fe2O3. In the oxidation reaction process, γ-Fe2O3 appeared firstly and then α-Fe2O3 generated. The experiment results can provide theoretical basis for the process optimum of refractory iron ore magnetic roasting.

关 键 词：菱铁矿 磁化焙烧 冷却 氧化反应 Γ-FE2O3 Α-FE2O3 

分 类 号：TD925.7[矿业工程—选矿]