Method for refining titanium dioxide in coal-fired flue gas denitration waste catalyst

The invention relates to a method for refining titanium dioxide in a coal-fired flue gas denitration waste catalyst. The method comprises the following steps of 1) pretreating the coal-fired flue gasdenitration waste catalyst; 2) carrying out alkaline leaching process treatment on the pretreated denitration waste catalyst; 3) carrying out solid-liquid separation on the alkaline leaching solutionto obtain a solid-phase crude titanium product A; 4) carrying out an acid pickling process on the crude titanium product A to obtain a crude titanium product B, and 5) carrying out a water boiling process on the crude titanium product to obtain refined titanium dioxide. Compared with the prior art, the method has the advantages of simple process, mild and controllable overall reaction conditions,low cost, no secondary pollution, high yield and purity of the refined titanium dioxide product and the like, and is suitable for industrial application. 本发明涉及一种精制燃煤烟气脱硝废弃催化剂中二氧化钛的方法，包括以下步骤：1)对燃煤烟气脱硝废弃催化剂进行预处理；2)对预处理后的脱硝废弃催化剂进行