Titanium Blast Furnace Slag Prepares Ammonium Metatungstate and Tungsten Trioxide Denitration Catalyst

Flue gas denitration refers to the reduction of NOx to N2, thereby removing NOx from the flue gas; it can be divided into wet and dry denitration method according to the press preparation process. Because of the high titanium content (about 20%), titanium blast furnace slag is often used in the preparation of titanium dioxide, and then as a carrier for preparing tungsten trioxide denitration catalyst.

blast furnace slag

The first one preparing method:
1. Crushing the Titanium blast furnace slag, adding the sulfuric acid for leaching out titanium dioxide, then get the solution filtered to obtain the residue and titanium-containing solution;
2. Add the burnability type porous catalyst carrier into the titanium-containing solution obtained in step 1 with stirring; besides, a basic compound is optionally added to adjust the pH value to carry out a hydrolysis;
3. Filtering, washing and drying the material after hydrolysis which is obtained in step 2 to generate the support partial titanate carrier;
4. Load precursor of tungsten source (ammonium paratungstate, ammonium metatungstate) and vanadium source (ammonium metavanadate) to the partial titanate;
5. Roasted to get the vanadium pentoxide-tungsten trioxide-titanium dioxide of SCR flue gas denitration catalyst.

The second preparing method:
1. The titanium blast furnace slag is crushed and then added sulfuric acid for the titanium dioxide leaching, finally filtered to get the residue and titanium-containing solution;
2. Add the burnability type porous catalyst carrier into titanium-containing solution under the condition of stirring, also a basic compound is added selectively to adjust the pH value for the solution hydrolysis, tungsten source precursor (ammonium paratungstate, ammonium paratungstate, etc.) is added during the hydrolysis process;
3. The materials after hydrolysis is filtered, washed and dried to get the get the partial titanate containing tungsten trioxide;
4. The product obtained in step 3 is calcined to generate the final product of vanadium pentoxide-tungsten trioxide-titanium dioxide SCR flue gas denitration catalyst; or calcine the partial titanate containing tungsten-supporting to prepare titanium-tungsten powder, then further loaded the precursor of vanadium source, firing again to prepare the vanadium-tungsten-titanium of SCR flue gas denitration catalyst.

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