采用硫酸法对废弃脱硝催化剂进行钛提取，对影响酸解率的因素进行了系统研究，确定了适宜工艺的参数。实验结果表明，影响酸解率的主要因素有物料细度、酸质量分数、酸与矿（废催化剂）质量分数比、反应时间和反应温度。在物料细度为325目、酸质量分数为95%、酸矿比为1.5：1~1.6：1、反应时间为8 h和反应温度为190℃下，酸解率可达85%，并可制备得到质量浓度为180 g/L左右的钛液，再经水解工序后获得关键指标可达商品指标水平的偏钛酸回收产品。

Titanium is extracted from the disused SCR denitration catalysts by sulfuric acid hydrolysis process.The factors that influence the acidolysis ratio of titanium extraction are studied systematically and the suitable parameters are confirmed.The experimental results show that the main factors affecting the acidolysis ratio includes the fineness of disused catalyst,acid concentration,the ratio of acid to disused catalyst,reaction time and reaction temperature.When the material fineness is 325 mesh,the acid concentration is 95%,the ratio of acid to disused catalyst is 1.5:1-1.6:1,reaction time is 8 h and reaction temperature is 190℃,the ratio of the acidolysis can reach 85% and the concentration of obtained titanium solution can reach about 180 g·L^-1.Meta titanic acid can be generated after hydrolysis of the obtained titanium solution,and can meet the requirement of commodity grade indexes.