混合酸浸法回收废脱硝催化剂的研究

Study on Recovery of Waste Denitrification Catalyst by Mixed Acid Leaching Method

为提高废脱硝催化剂中钒的浸出率,将草酸和硫酸配制成混合酸,进行了废脱硝催化剂在混合酸下的钒浸出研究,考察了不同温度下混合酸的浓度配比对钒浸出率的影响。结果表明:以0.6 mol/L草酸+3 mol/L硫酸的混合酸作为浸出剂时,废脱硝催化剂中钒的浸出率达81.91%。在优选工艺下得到的浸出渣粉体的主要成分为锐钛矿型TiO_(2),在富集TiO_(2)的同时浸出渣的比表面积提高18.3%,钛钨含量占比为91.8%,可作为制备催化剂的原材料循环使用。

To improve the leaching rate of vanadium from waste denitration catalyst,oxalic acid and sulfuric acid are prepared into mixed acids,and the leaching rate of vanadium from waste denitration catalystsunder mixed acid is studied.The effects of the concentration ratio of mixed acid on vanadium leaching rate at different temperatures are investigated.The results show that the leaching rate of vanadium from waste denitration catalyst reaches 81.91%when the mixed acid of 0.6 mol/L oxalic acid and 3 mol/L sulfuric acid is used as the leaching agent.The main component of leaching residue powder obtained under the optimized process is anatase TiO_(2).While enriching TiO_(2),the specific surface area of leaching residue is increased by 18.3%,and the content of titanium and tungsten is 91.8%,which can be used as raw materials for preparing catalysts.