废弃脱硝催化剂选择性提取钒和钨

Researchon Selective Extraction of Vanadium and Tungsten from Waste Denitration Catalyst

废弃脱硝催化剂富含钛、钨等有价金属,但同时也含有毒性较大的砷、汞、铅等有害物质,目前未得到工业应用,不仅浪费资源,还对环境造成巨大压力。针对失效脱硝催化剂,开展了综合回收研究,提出了“低温活化—选择性浸出—树脂交换”工艺技术路线。通过试验研究,钒、钨的浸出率分别可达96.29%和88.10%,钛基本被抑制在渣中,实现了钒、钨的选择性浸出;浸出渣可直接作为催化剂基体原料或采用硫酸法(或氯化法)制备高品质钛白,通过酸解—水浸—水解后可获得TiO_(2)含量为99%的二氧化钛。

Waste denitration catalyst is rich in valuable metals such as titanium and tungsten,but it also contains toxic harmful substances such as arsenic,mercury and lead.At present,the waste denitration catalyst has not been used in industry,which not only wastes resources,but also causes great pressure on environment.Comprehensive recovery research on waste denitration catalyst was carried out,and the process route of low temperature activation,selective leaching,and resin exchange was put forward.Through experimental research,leaching rate of vanadium and tungsten is 96.29%and 88.10%respectively.Titanium is basically restrained in the residue.The leaching residue can be directly used as catalyst matrix raw material or high-quality titanium dioxide prepared by sulfuric acid method(or chlorination method).Titanium dioxide with TiO_(2) content of 99%can be obtained through acid hydrolysis,water leaching,and hydrolysis.