磁化焙烧产品氧化动力学研究  

Study on Oxidation Kinetics of Magnetized Roasted Products

作　　者：李嘉 孙洪硕[1] 祁生亮 崔建辉[1] 李广文[1] 高泽宾[1] 曹兵 LI Jia;SUN Hongshuo;QI Shengliang;CUI Jianhui;LI Guangwen;GAO Zebin;CAO Bing(Jiuquan Iron and Steel(Group)Co.,Ltd.,Jiayuguan 735100,China)

机构地区：[1]酒钢集团宏兴钢铁股份有限公司,甘肃嘉峪关735100

出　　处：《金属矿山》2022年第8期114-118,共5页Metal Mine

基　　金：甘肃省重点人才项目(编号:909192082019);甘肃省科技重大专项(编号:19ZD2GB001)。

摘　　要：针对磁化焙烧后的氧化反应过程开展了研究,利用TGA、SEM检测技术对酒钢选矿厂综合尾矿磁化焙烧产品的氧化过程反应机制进行分析,并结合模型匹配法对氧化动力学参数进行求解。结果表明:磁化焙烧产品在氧化过程中,适当地增加氧化反应的温度,可以明显加快氧化反应的速率,减少磁化焙烧产品被氧化所需的时间,但过高的温度会导致磁化焙烧产品过氧化。氧化反应动力学的最佳机理函数为二维扩散模型(Valensi)G(α)=α+(1-α)ln(1-α),其表观活化能E为5.16 k J/mol,指前因子A为14.73 min^(-1)。磁化焙烧产品中的微裂纹可为O_(2)气体提供向内扩散的通道,其氧化过程的反应限制环节为O_(2)气体在颗粒表面及缝隙表面的二维扩散。The oxidation reaction process after magnetization roasting was studied.The TGA and SEM detection techniques were used to study the reaction mechanism of the oxidation process of the magnetization roasting product of the comprehensive tailings of Jiuquan Iron and steel concentrator,and the oxidation kinetic parameters were solved and analyzed combined with the model matching method.The results show that during the oxidation process of magnetized roasted products,appropriately increasing the temperature of oxidation reaction can significantly accelerate the rate of oxidation reaction and reduce the time required for the magnetized roasted products to be oxidized,but too high temperature will lead to the peroxidation of magnetized roasted products.The best mechanistic function for the reaction kinetics is the two-dimensional diffusion model(Valensi)G(α)=α+(1-α)ln(1-α)with an apparent activation energy E of 5.16 kJ/mol and a prefactor A of 14.73 min^(-1).The microcracks in the roasted products provide an inward diffusion channel for the O_(2) gas.The reaction limiting link in the oxidation process is the two-dimensional diffusion of O_(2) gas on the particle and crevice surfaces.

关 键 词：磁化焙烧产品 热重分析 低温氧化 等温动力学 微观结构 

分 类 号：TD925[矿业工程—选矿]