Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for efficiently extracting V/W/Ti from waste denitration catalyst

A waste denitration catalyst and alkali leaching technology, applied in the direction of titanium oxide/hydroxide, titanium dioxide, process efficiency improvement, etc., can solve the problems of secondary pollution of heavy metals, inability to achieve high recovery rate at the same time, waste of resources, etc. The effect of permeability, avoiding acid-base consumption and reducing cost input

Active Publication Date: 2021-06-18
SOUTH CHINA UNIV OF TECH
View PDF10 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current problem is that the design life of the catalyst is usually 3 years, and after 2018 it will produce at least 76,000 m 3 Spent denitrification catalyst, containing about 30,400 tons of TiO 2 , 04,000 tons V 2 o 5 and 0.19 million tons of WO 3 If such a huge amount of waste denitrification catalysts are not recycled but directly landfilled, it will not only cause serious heavy metal secondary pollution, but also bring huge waste of resources
However, this method prepares TiO 2 The specific surface area and the content of impurities such as Fe, Na, K, etc. are not mentioned, these indicators are very important for the prepared TiO 2 Whether it can be used commercially is an important measure
[0009] In summary, the existing patented technology cannot achieve high recovery rates for valuable metals V, W, and Ti at the same time, and the recovered titanium dioxide only considers the purity or some technical indicators

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for efficiently extracting V/W/Ti from waste denitration catalyst
  • Method for efficiently extracting V/W/Ti from waste denitration catalyst
  • Method for efficiently extracting V/W/Ti from waste denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) The waste denitration catalyst is soot-blown, washed with water, ground, and passed through a 120-mesh sieve.

[0046] (2) Weigh 100g of the sieved sample and place it in an autoclave, add 120g of NaOH solution with a mass fraction of 30% and a stirring bar, heat up to 100°C, stir at 700r / min for 3h, and cool to room temperature After filtration, leachate and filter cake were obtained, and the filter cake was dried at 100° C. for 12 hours to obtain coarse titanium slag.

[0047] (3) Pass 100mL of the leachate obtained in step (2) into a glass tube containing 50g of polypropylene fiber, and exchange at a constant temperature of 25°C for 1h to obtain VO-rich 3 - The effluent and adsorbed WO 4 2- ionic fibers. Rich in VO to 100g 3 - Add 4.17g ammonium chloride in the effluent liquid, filter to obtain product ammonium metavanadate.

[0048] (4) the adsorption WO obtained in step (3) 4 2- 250mL, 2mol / L NH 4 Cl and 1mol / LNH 3 ·H 2 The desorption solution of O ...

Embodiment 2

[0053] (1) The waste denitration catalyst is soot-blown, washed with water, ground, and passed through a 120-mesh sieve.

[0054] (2) Weigh 100g of the sieved sample and place it in an autoclave, add 100g of NaOH solution with a mass fraction of 20% and a stirring bar, heat up to 60°C, stir at 750r / min for 3h, and cool to room temperature After filtration, leachate and filter cake were obtained, and the filter cake was dried at 100° C. for 12 hours to obtain coarse titanium slag.

[0055] (3) Put 100mL of the leaching solution obtained in step (2) into a glass tube containing 71.4g of polypropylene fibers, and exchange at a constant temperature of 25°C for 0.5h to obtain VO-rich 3 - The effluent and adsorbed WO 4 2- ionic fibers. Enriched with VO to 100g 3 - Add 7.14g ammonium chloride in the effluent liquid, filter to obtain product ammonium metavanadate.

[0056] (4) the adsorption WO obtained in step (3) 4 2- The ionic fiber uses 85.7mL, 1mol / L NH 4 Cl and 0.5mol / ...

Embodiment 3

[0061] (1) The waste denitration catalyst is soot-blown, washed with water, ground, and passed through a 120-mesh sieve.

[0062] (2) Weigh 100g of the sieved sample and place it in an autoclave, add 80g of NaOH solution with a mass fraction of 40% and a stirring bar, heat up to 200°C, stir at 700r / min for 9h, and cool to room temperature After filtration, leachate and filter cake were obtained, and the filter cake was dried at 100° C. for 12 hours to obtain coarse titanium slag.

[0063] (3) Pass 50mL of the leach solution obtained in step (2) into a glass tube containing 10g of polyvinyl alcohol fibers, and exchange at a constant temperature of 30°C for 12h to obtain VO-rich 3 - The effluent and adsorbed WO 4 2- ionic fibers. Enriched with VO to 50g 3 - Add 1g ammonium chloride in the effluent liquid, filter to obtain product ammonium metavanadate.

[0064] (4) the adsorption WO obtained in step (3) 4 2- 30mL, 3mol / L NH 4 Cl and 3mol / LNH 3 ·H 2 The desorption sol...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
specific surface areaaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for efficiently extracting V / W / Ti from a waste denitration catalyst. The method comprises the following steps of carrying out soot blowing, water washing, grinding and sieving on the waste denitration catalyst, heating, stirring, carrying out alkaline leaching, and filtering to obtain filtrate rich in V and W and coarse titanium slag; introducing the filtrate into a glass tube filled with anion exchange fibers to realize efficient separation of VO3 <-> and WO4 < 2-> in the filtrate, and then adding ammonium chloride into the filtrate to precipitate vanadium; washing the ion exchange fiber adsorbing WO4 < 2-> with a desorption solution, and evaporating and crystallizing the obtained solution to obtain ammonium paratungstate; and finally, adding the coarse titanium slag into an acid solution, adding a filter aid, stirring, filtering, washing and drying to obtain acidified titanium slag, and roasting to obtain purified TiO2. According to the technical route provided by the invention, the recovery rates of V, W and Ti are correspondingly 100%, 100% and 76.37% at most, the efficient recycling of the waste denitration catalyst is realized, and the method has great economic and social benefits.

Description

technical field [0001] The invention belongs to the field of recovery and reuse of waste catalysts, in particular to a method for efficiently extracting V / W / Ti from waste denitration catalysts. Background technique [0002] In order to protect the atmospheric environment, all coal-fired units above 300,000 kilowatts in my country have been forced to install flue gas denitrification systems. According to statistics, in 2015, the installed capacity of domestic SCR denitrification catalysts was 456,000 m 3 . The current problem is that the design life of the catalyst is usually 3 years, and after 2018 it will produce at least 76,000 m 3 Spent denitrification catalyst, containing about 30,400 tons of TiO 2 , 04,000 tons V 2 o 5 and 0.19 million tons of WO 3 If such a huge amount of waste denitrification catalysts is not recycled but directly landfilled, it will not only cause serious secondary pollution of heavy metals, but also bring huge waste of resources. [0003] For...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/00C22B34/12C22B34/22C22B34/36C01G23/047
CPCC22B7/008C22B1/005C22B34/225C22B34/365C22B34/1254C01G23/047Y02P10/20
Inventor 夏启斌陈嘉宇吴兴贝赵长多
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com