<正> 为了阐明QSL法直接炼Pb的化学反应动力学,研究PbS与PbO及xPbO·SiO_2的交互作用是具有实际意义的。为了避免高温造成PbS和PbO的挥发损失,在较低温度下研究该体系的交互反应动力学,对探索火法炼Pb新工艺具有一定价值。 试料是分析纯PbO,PbS和合成的纯xPbO·SiO_2,试料粒度均为100—120 mesh,在配比试样中以PbO:PbS=2:1作基础并混匀,以便保证按化学计量反应产生SO_2。装有试料的刚玉坩埚在密封竖直刚玉管底部低温区用Ar气保护升温加热,待达到预期温度后,坩埚由密封系统中的活动撑杆推到高温区并同时用Ar气载流使产生的SO_2连续为碘量法所测
The rate equation for the reaction of PbO with PbS in liquidstate at 850--1000℃ has been determined as dα/dt=4.73×10~6 exp (-190/RT)in which the activation en ergy E=190kJ/mol. In the solid-liquid reaction system of xPbO. SiO_2-PbS, the rate equation maybe formulated as following: dF(α)/dt=k′(t<20min)+k"(t>20min) (1000℃)where F(α)=α-(N°_(SiO_2/N°_(PbO))ln(1-α) The activities of PbO and SiO_2 in the silicate calculated from the rate dataare in good agreement with those measured thermodynamically.
参考文献
| [1] | |
| [2] | |
| [3] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%