熔融镍渣等温氧化动力学研究  

Oxidation Kinetics of Molten Nickel Slags Under Isothermal Conditions

作　　者：李彬[1] 申莹莹[1] 冯琼[2] 王晟[1] 杜雪岩[1] Li Bin;Shen Yingying;Feng Qiong;Wang Sheng;Du Xueyan(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《稀有金属材料与工程》2023年第6期2189-2195,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52164034,52008196);甘肃省科技重大专项计划(19ZD2GD001);甘肃省自然科学基金(21JR7RA222,21JR7RA231,21JR7RA241)。

摘　　要：研究了富铁熔融镍渣在空气气氛下的等温氧化动力学行为。利用高温激光共聚焦显微镜(HT-CLSM)确定三元碱度0.6调质镍渣的实际熔融温度(液相线温度)为1488℃。通过管式炉等温氧化试验,获取温度1500~1575℃下熔融镍渣氧化过程Fe^(2+)浓度-时间曲线,采用微分法和Arrhenius方程计算出熔渣中Fe^(2+)的氧化反应级数为1.45~1.26,表观活化能为286.83 k J/mol,明确熔融镍渣氧化动力学主要受扩散传质控速。基于双膜理论和渗透理论,估算出1500~1575℃熔渣中氧的扩散系数分别为2.02×10^(-9)~4.42×10^(-9)m^(2)/s和0.50×10^(-9)~2.19×10^(-9)m^(2)/s,双膜理论估算出的氧扩散系数更具参考意义。The isothermal oxidation kinetics of iron-rich molten nickel slag in air atmosphere was studied.The actual melting temperature(liquidus temperature)of modified nickel slag was determined to be 1488℃by high temperature confocal laser scanning microscope(HT-CLSM).Variation of Fe^(2+)concentration with time during isothermal oxidation of molten nickel slag was obtained by isothermal oxidation experiment of tubular furnace.The oxidation reaction order of Fe^(2+)in molten nickel slag is 1.45-1.26 and the apparent activation energy is 286.83 kJ/mol by differential method and Arrhenius equation.The oxidation kinetics of molten nickel slag is dominated by diffusion control.Based on the Whitman theory and Higbie theory,the diffusion coefficients of oxygen in the melt are estimated to be 2.02´10^(-9)-4.42´10^(-9)m^(2)/s and 0.50´10^(-9)-2.19´10^(-9)m^(2)/s.The oxygen diffusion coefficient estimated by Whitman theory is of greater reference value.

关 键 词：熔融镍渣 氧化动力学 反应级数 表观活化能 扩散系数 

分 类 号：TG146.15[一般工业技术—材料科学与工程]