A kind of titanium-based ceramics and its green preparation method

Abstract

The invention discloses a titanium-based ceramic and a green preparation method thereof. The titanium-based ceramic is prepared through the following raw material components in parts by mass: 50-80 parts of a waste vanadium-titanium denitration catalyst, 3-10 parts of Al2O3, 1-6 parts of ZrO2, 0.2-1.5 parts of Co3O4, 0.5-1.5 parts of TiB2, 8-15 parts of CaO, and 0.5-1.2 parts of a V-element solidsolvent. The titanium-based ceramic integrates the compressive strength and the flexure strength; the compressive strength is 653MPa or more, and the flexure strength is 184MPa or more; the V elementleaching rate is far less than that of the limit value required by national standard; and high added-value resource utilization of the wasted toxic vanadium-titanium denitration catalyst is achieved.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a green preparation method for obtaining titanium-based ceramics by using waste vanadium-titanium denitrification catalysts as raw materials. Background technique [0002] Flue gas denitrification at home and abroad mainly adopts selective catalytic reduction (SCR) technology. Commercial denitration catalysts are mostly vanadium-titanium catalysts. The components of vanadium-titanium catalysts are V2O5, TiO2, WO3, and the catalyst life is 2-3 years. There are about 1.5 million catalysts in my country every year. m3 of waste catalyst, although the catalyst can be regenerated after deactivation, but it will produce secondary pollution (including V toxic waste liquid), and it will be treated after failure, generally to recover the components, and the treatment cost is as high as 10,000 yuan / m3 . [0003] Among the most widely used vanadium-titanium denitration catalysts on th...

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Problems solved by technology

[0002] Flue gas denitrification at home and abroad mainly adopts selective catalytic reduction (SCR) technology. Commercial denitration catalysts are mostly vanadium-titanium catalysts. The components of vanadium-titanium catalysts are V2O5, TiO2, WO3, and the catalyst life is 2-3 years. There are about 1.5 million catalysts in my country every year. m3 of waste catalyst, although the catalyst can be regenerated after deactivation, but it will produce secondary pollution (including V toxic waste liquid), and it will be treated after failure, generally to recover the components, and the treatment cost is as high as 10,000 yuan / m3

[0003] Among the most widely used vanadium-titanium denitration catalysts on the market, TiO 2 The highest content is about 80wt%, V 2 o 5 It is about 1wt%. In the article "The Effects of Different Additives on the Properties of Titanium-based Ceramics Prepared from Waste Denitration Catalysts", it is disclosed that CuO, borax, and Nb 2 o 5 Three kinds of admixtures are used to prepare titanium-based ceramics, only doped with 2% Nb 2 o 5 The overall performance of the sample is the best, but its maximum bending strength is less than 190MPa, and its compressive strength is less than 630MPa

[0004] And the patent CN105347785 "Titanium-based ceramics and its preparation method using waste vanadium-titanium denitrification catalyst as raw material" discloses the use of 30-80% vanadium-titanium denitrification catalyst, 0.22-45% silicon source powder, and 0.06-18% aluminum source powder Material (Al 2 o 3 ), 0.02-9% sintering accelerator (alkali metal oxide), 0.1-10% V element solid solvent (Nb 2 o 5 、B 2 o 3 , Fe 3 o 4 、MoO 3 、 Ta 2 o 5 , CuO), although the compressive strength of the prepared titanium-based ceramics can reach 530-955MPa, but the highest bending strength is only 150MPa

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