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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Sky-High Green Ticket Reproduced, Tungsten Trioxide Denitration Catalyst Boosts Air Purification

June 1st in the morning, Shanghai Environmental Protection Bureau said it would write a ten million Yuan of green ticket to a company; and, it was revealed that Shanghai is revising the new environmental regulations, proposed individual fines from 200,000 Yuan increased to 1 million. This may be another 10 million Yuan level green ticket since last year after the Qinhuangdao City Environmental Protection Bureau of the States (Qinhuangdao) Co., Ltd. Sewage Treatment out of nearly 13 million of ticket.

thermal power plant denitration catalyst

Some netizens commented: "Well done, if they had known today, why didn’t it take this ten million to invest in SCR denitration and desulfurization project which can also contribute to improve our living environment." Denitration catalyst is the core of SCR technology, the current widespread used is based on tungsten trioxide (or molybdenum trioxide) and vanadium pentoxide as the main active material, the titanium oxide as a carrier, and loading of other related species. Tungsten trioxide can improve the anti-sulfidation of the catalyst, and to enhance the anti-weld ability of the carrier. By the way, the nano-tungsten trioxide will exhibit better performance with its larger surface area. 

It is reported that, more than 20 units of the plants have been completed desulfurization and denitrification transformation in Shanghai, this year, more than 1,400 factories also identified to carry out VOCs transformation; in addition, tens of thousands of the old cars would be eliminated. Exhaust gas thermal power plant is one of the main sources of NOx and other pollutants, the using of SCR project using tungsten trioxide denitration catalyst to governance, is now widely recognized as the most effective way of NOx removal; at the same time, the elimination of old cars, while vigorously implement the vehicles which installed tail gas treatment unit (such as tungsten trioxide with SCR denitration catalyst), thus, the pressure on the environment will possible to greatly reduced.

I believe if everyone pay attention to the environment protection issues, what smog, water pollution ect., will be nowhere to hide, and sky-high green ticket will no longer appear.


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