论文部分内容阅读
二氧化锡碳还原法是生产金属锡的主要方法之一。虽然用碳还原法生产金属锡的工艺早已实现,但对其热力学和动力学方面的研究还比较少,而且在对还原过程中是否生成低价氧化锡的问题上还存在分歧。本文采用热分析法在不同条件下研究了 SnO_2在1000℃以下的碳还原过程。通过实验,查明了在没有稳定剂使非稳定相 SnO 稳定化的条件下,SnO_2将直接还原为金属锡;反之,在能稳定 SnO 的条件下,还原遵循顺序转变原则:
Tin dioxide carbon reduction is one of the main methods of producing metallic tin. Although the process of producing metallic tin by carbon reduction has been realized for a long time, there are still few studies on its thermodynamics and kinetics, and there are still disagreements on whether to generate low-priced tin oxide during the reduction process. In this paper, the thermal reduction method was used to study the carbon reduction of SnO_2 below 1000 ℃ under different conditions. Through experiments, it has been found that SnO 2 will be directly reduced to metallic tin in the absence of stabilizers to stabilize the unstable phase of SnO. On the other hand, under the condition of stabilizing SnO, the reduction follows the principle of sequential transition: