A method for comprehensive recovery and utilization of vanadium-titanium series denitrification waste catalyst

A waste catalyst and tethering technology, applied in the direction of improving process efficiency, can solve the problems of unenvironmental recycling process, high production cost, large environmental pollution, etc., and achieve high product added value, low production cost and high product value. Effect

Active Publication Date: 2019-09-27
钢研晟华科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses Na 2 CO 3 As a roasting agent, hot water leaching recovers tungsten and vanadium, TiO 2 Sulfuric acid method is still used for recycling, which has problems such as high production cost and large environmental pollution.
[0004] The recycling of spent denitrification catalysts has just started in my country. Many companies and universities have carried out research on the recycling of denitrification catalysts. These technologies have significant advantages in the recovery of tungsten and vanadium, but it is difficult to recover TiO, the main component of denitrification catalysts. 2 , or the recycling process is not environmentally friendly and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The main chemical composition of the vanadium-titanium series spent catalyst is as follows (by mass): TiO 2 86.2%, V 2 o 5 3.4%, WO 3 7.5%, MoO 3 2.4%, other 0.7%.

[0052] The process steps are as follows: 100kg spent catalyst is ground to 300μm, and 140kg powdered Na 2 CO 3 Mix evenly, then roast the mixture at a high temperature of 1100°C for 5 hours, and directly water quench the roasted material to obtain a glass body, and then finely grind the glass body to 150 μm to obtain a finely ground powder. Put the finely ground powder into hot water at about 80°C at a solid-to-liquid mass ratio of 1:50, stir, wash and filter, and obtain lye and titanate precipitation containing sodium vanadate, sodium tungstate and sodium molybdate. Lye is used to extract V 2 o 5 、WO 3 and MoO 3 , titanate precipitation and water are loaded into the reactor at a mass ratio of 1:10, the raw materials are mixed evenly by stirring, the pH of the solution is adjusted to 5.0 with ...

Embodiment 2

[0054] The main chemical composition of the vanadium-titanium series spent catalyst is as follows (by mass): TiO 2 90.0%, V 2 o 5 2.1%, WO 3 5.5%, MoO 3 1.4%, other 1.0%.

[0055] The process steps are as follows: grind 100kg spent catalyst to 100μm, mix with 70kg powdered Na 2 CO 3 Mix evenly, then roast the mixture at a high temperature of 1400°C for 0.5 hours, and directly water quench the roasted material to obtain a glass body, and then finely grind the glass body to 80 μm to obtain a finely ground powder. Put the finely ground powder into hot water at about 80°C at a solid-to-liquid mass ratio of 1:20, stir, wash and filter, and obtain lye and titanate precipitation containing sodium vanadate, sodium tungstate and sodium molybdate. Lye is used to extract V 2 o 5 、WO 3 and MoO 3 , titanate precipitation and water are loaded into the reactor at a mass ratio of 1:50, the raw materials are mixed evenly by stirring, the pH of the solution is adjusted to 4.0 with...

Embodiment 3

[0057] The main chemical composition of the vanadium-titanium series spent catalyst is as follows (by mass): TiO 2 88.3%, V 2 o 5 2.4%, WO 3 5.5%, MoO 3 1.4%, other 2.4%.

[0058] The process steps are as follows: grind 100kg spent catalyst to 80μm, and mix with 130kg powdered Na 2 CO 3 Mix evenly, then roast the mixture at a high temperature of 1300°C for 2 hours, and directly water quench the roasted material to obtain a glass body, and then finely grind the glass body to 60 μm to obtain a finely ground powder. Put the finely ground powder into hot water at about 80°C according to the solid-to-liquid mass ratio of 1:100, stir, wash and filter, and obtain lye and titanate precipitation containing sodium vanadate, sodium tungstate and sodium molybdate. Lye is used to extract V 2 o 5 、WO 3 and MoO 3 , Titanate precipitation and water are loaded into the reactor at a mass ratio of 1:150, the raw materials are mixed evenly by stirring, the pH of the solution is adju...

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Abstract

The invention discloses a method for comprehensively recycling a vanadium-titanium series denitration spent catalyst. The spent catalyst and sodium carbonate are mixed and subjected to high-temperature roasting, then obtained high-temperature melt is subjected to water quenching, and a glass body is manufactured; the glass body is subjected to fine grinding and then water leaching, and filter liquid and filter slag are obtained after filtering; and the filter liquid is used for extracting vanadium oxide, tungsten oxide and molybdenum oxide, and the filter slag is used for preparing titanium dioxide. By means of the method, valuable elements in the spent catalyst are completely recycled, in addition, the obtained product can be directly returned to be used for preparing of the denitration catalyst, various elements can be recycled at the same time, and especially, the titanium element can be recycled. By means of the method, a titanium dioxide product can be directly obtained finally, the purity of the titanium dioxide product can reach 99.0% or above, the process of sulfuric acid method recycling is omitted, and the method has the beneficial effects that the technology is environment-friendly, the comprehensive recycling cost is low, and the product value is high.

Description

technical field [0001] The invention relates to the field of recovery and utilization of spent denitrification catalysts, in particular to a method for comprehensive recovery and utilization of vanadium-titanium series denitrification waste catalysts. Background technique [0002] The vanadium-titanium denitrification catalyst can be used at relatively low temperature to NH 3 NO x Reduction to non-polluting N 2 and H 2 O, NH 3 with O 2 The redox hardly occurs, thus increasing the N 2 selectivity, saving the NH 3 cost. Vanadium-titanium denitrification waste catalysts contain valuable metals such as titanium, tungsten, molybdenum, and vanadium. Direct disposal will not only cause air, water, and soil pollution, seriously endanger soil vegetation and human health, but also cause a waste of metal resources. According to the current market prices of titanium dioxide, vanadium pentoxide, tungsten oxide and molybdenum oxide, the recycling of spent denitrification catalysts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/12C22B34/22C22B34/34C22B34/36
CPCC22B7/001C22B7/006C22B34/1236C22B34/225C22B34/345C22B34/365Y02P10/20
Inventor 高建军张俊王锋王海风林万舟严定鎏齐渊洪
Owner 钢研晟华科技股份有限公司
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