CaCO_3抑制三氧化钼挥发热力学及动力学分析  

An Analysis on Thermodynamics and Kinetics of Volatilization of Molybdenum Trioxide Inhibited by CaCO_3

作　　者：朱航宇[1] 李正邦[1] 杨海森[1] 刘吉刚[1] 

机构地区：[1]钢铁研究总院冶金工艺研究所,北京100081

出　　处：《特殊钢》2012年第1期12-14,共3页Special Steel

基　　金：江苏省科技成果转化专项资金项目BA2010139

摘　　要：三氧化钼(MoO_3)的挥发特性是导致Mo收得率较低的主要原因,采用CaCO_3对MoO_3进行稳定化处理是抑制MoO_3挥发的行之有效的方法。从热力学及动力学角度研究了CaCO_3和MoO_3低温固相反应。结果表明,二者在450℃就可反应生成稳定CaMO_4,600～700℃反应速率较快且MoO_3未开始挥发,在此温度区间对MoO_3预处理效果较好。采用Coats-Redfern法计算了不同升温速率下CaC0_3和MoO_3固相反应动力学参数,活化能(E)和指前因子(A)分别为167.45 kJ/mol、1.22×10~7s^(-1),速率常数k=1.22×10~7×exp(-20 140/T)。The volatilization characteristic of molybdenum trioxide （ MoO3 ） is the main reason led to low yield of Mo, while the MoO3 stabilizing-treated by CaCO3 is an effective way to inhibit the volatilization of MoO3. The low-temperature solid phase reaction between MoO3 and CaCO3 has been studied according to thermodynamics and kinetics law. Results show that MoO3 and CaCO3 may react at 450 ℃ to form stable CaMoO4, the reaction is faster at 600 - 700 ℃ and there is no volatilization of MoO3 therefore it is available to pre-treated MoO3 at the temperature range. The CaCO3 and MoO3 solid phase reaction kinetics parameters at different heating speed are calculated by Coats-Redfern function, the activation energy （E） and pre-exponential factor （A） are respectively 167.45 kJ/mol and 1.22 × 10^7 s^-1, and the reaction rate constant k = 1.22 × 10^7 exp（ - 20 140/T）.

关 键 词：碳酸钙 三氧化钼 抑制挥发 热力学 动力学 

分 类 号：TF701.1[冶金工程—钢铁冶金]