纯铁液中Ce-O,Nd-O平衡常数的测定

金属学报, 1982, 18(2): 176-186.

纯铁液中Ce-O,Nd-O平衡常数的测定

北京钢铁学院

DETERMINATION OF EQUILIBRIUM CONSTANT OF Ce-O OR Nd-O IN LIQUID IRON

Han Qiyong , Liu Shiwei , Niu Hongbing , Tang Zhiwei Beijing University of Iron and Steel Technology

自射线照相表明,铁液中的 Ce,Nd 与 MgO,CaO 坩埚均有明显的作用.在保证Ce,Nd 与坩埚充分作用以达到平衡的条件下,应用放射性同位素~(141)Ce,~(147)Nd 及有机电解液电解法测定了铁液中溶解之 Ce,Nd 含量.用 ZrO_2(MgO)管组成的固体电解质电池测定了铁液中溶解氧的活度.计算出1550—1650℃范围内 Ce-O,Nd-O 平衡常数.对于反应 Ce_2O_(3(s))=2[Ce]+3[O]△G*_(Ce_2O_3)451150-161.68TlgK_(Ce_2O_3)=-(98611)/T+35.34对于反应 Nd_2O_3=2[Nd]+3[O]△G*_(Nd_2O_3)=375010-123.7TlgK_(Nd_2O_3)=-(81970)/T+27.04Nd 溶解于铁液的标准自由能 Nd(1)=[Nd]_(1%)△G*_(Nd)=19790-30.40Tlgγ*_(Nd)=(4326.1)/T-4.154

Autoradiographs have shown that there is an obvious reaction between Ce and Nd in liquid iron and MgO,CaO crucible wall.For reaching the Ce-O, Nd-O equilibrium,a long smelting period and the adding of rare earth elements in several batches were needed to ensure the full reaction between the rare earth elements in melt and the crucible wall.The dissolved Ce or Nd content in iron was measured by means of radioactive isotopes ~(141)Ce or ~(147)Nd together with electrolysis in the organic electrolyte of samples.The oxygen activity was measured by solid electrolyte sensors made of ZrO_2(MgO) tube. Ce_2O_(3(s))=2[Ce]+3[O] △G*_(Ce_2O_3)=451150-161.68T lgK_(Ce_2O_3)=-(98611)/T+35.34 Nd_2O_3=2[Nd]+3[O] △G*_(Nd_2O_3)=375010-123.7T lgK_(Nd_2O_3)=-(81970)/T+27.04 The standard free energy of dissolution of Nd in liquid iron: Nd_(1)=[Nd]1% △G=19790-30.40T lgγ*_(Nd)=(4326.1)/T-4.154.

参考文献

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]
[25]
[26]
[27]

上一张下一张

计量

下载量()
访问量()

作者相关

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网