燃煤电厂废弃SCR催化剂回收二氧化钛的研究

对废弃的选择性催化还原(SCR)烟气脱硝催化剂中有价金属进行回收，将其变废为宝意义重大。以某燃煤电厂废弃的SCR脱销催化剂为研究对象，采用钠化焙烧工艺从废弃的SCR催化剂中回收二氧化钛(TiO₂ )等有价金属。分别考察了碳酸钠投加量、稀硫酸投加量、浸出热水量、浸出时间、浸出温度、焙烧时间、焙烧温度对TiO₂ 回收率的影响。结果表明:钠化焙烧、熟料浸出和硫酸水洗过程对TiO₂ 的提取均影响显著。在优化条件下，TiO₂ 回收率达到92.15%，产物纯度可达96.28%。可行性分析表明，所研制的SCR催化剂回收方案经济效益较好。

Study on the TiO2 Recovery from SCR Catalyst Waste in Coal-Fired Power Plants

It is of great significance to recover the valuable metals from the inactive SCR denitration catalyst waste and make them recycled. Taking the waste SCR catalyst from a thermal power plant as the study object, the titanium dioxides are recovered with sodiumzation-calcinating technology from the abandoned SCR catalysts. In addition, the effects of sodium carbonate and dilute sulphuric acid dosages, the leaching water volume, time and temperature, and the calcinating time and temperature on the recovery rate are studied. The results indicate that the processes of sodiumzation-calcinating, raw material extraction and sulphuric acid washing have great impacts on the titanium dioxide extraction. Under the optimal condition, the recovery rate reaches as much as 92.15% with the product purity of 96.28%. The feasibility analysis shows that the developed SCR catalyst recovery program has good economic returns.