Sub-molten salt method for totally recycling vanadium, tungsten and titanium from waste denitration catalyst

A technology of denitrification catalyst and sub-molten salt, which is applied in the fields of tungsten, titanium and vanadium recovery, can solve the problems of energy consumption and element waste, achieve low production cost, huge economic and social benefits, and relieve resource pressure.

Active Publication Date: 2017-06-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, there are still many problems in the existing waste denitrification catalyst recovery research: (1) the recovery process produces a large amount of sulfur dioxide and industrial wastewater, such as concentrated sulfuric acid acid hydrolysis; (2) recovery generally focuses on the recovery of a certain element, such as for titanium The recovery of elements and vanadium elements, etc., have caused waste of elements and energy consumption, so the experimental process of recovery needs to be more concise, harmless and industrializable

Method used

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  • Sub-molten salt method for totally recycling vanadium, tungsten and titanium from waste denitration catalyst

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Effect test

Embodiment 1

[0019] The waste denitrification catalyst is subjected to soot blowing and grinding treatment to obtain waste denitration catalyst powder; the waste denitration catalyst powder is leached with sodium hydroxide sub-molten salt leaching solution, the concentration of sodium hydroxide sub-molten salt in the leaching solution is 5mol / L, and the solid-liquid ratio is 1g: 40ml, the leaching temperature is 130°C, and the leaching time is 4h, to obtain the leaching solution and leaching residue; the leaching residue is cleaned and filtered with hydrochloric acid to obtain anatase titanium dioxide and cleaning solution, and the cleaning solution is evaporated and crystallized to obtain NaCl; the leaching solution is Continue to mix with sodium hydroxide sub-molten salt to carry out sub-molten salt leaching behavior, and recycle the leachate until the tungsten content in the solution reaches 5%, stop the circulation; Calcium is calcified and precipitated, first adding hydrochloric acid t...

Embodiment 2

[0021] The waste denitration catalyst is soot blown and ground to obtain the waste denitration catalyst powder; the waste denitration catalyst powder is leached with the sodium hydroxide sub-molten salt leaching solution, the concentration of the sodium hydroxide sub-molten salt in the leaching solution is 10mol / L, and the solid-to-liquid ratio is 1g: 100ml, the leaching temperature is 180°C, and the leaching time is 8h, to obtain the leaching solution and leaching residue; the leaching residue is cleaned and filtered with hydrochloric acid to obtain anatase titanium dioxide and cleaning solution, and the cleaning solution is evaporated and crystallized to obtain NaCl; the leaching solution is Continue to mix with sodium hydroxide sub-molten salt to carry out sub-molten salt leaching behavior, and recycle the leachate until the tungsten content in the solution reaches 10%, stop the circulation; Calcium is calcified and precipitated, first adding hydrochloric acid to the solutio...

Embodiment 3

[0023] The waste denitration catalyst is subjected to soot blowing and grinding to obtain the waste denitration catalyst powder; the waste denitration catalyst powder is leached with the sodium hydroxide sub-molten salt leaching solution, the concentration of the sodium hydroxide sub-molten salt in the leaching solution is 6mol / L, and the solid-to-liquid ratio is 1g: 50ml, the leaching temperature is 140°C, and the leaching time is 5h, to obtain the leaching solution and leaching residue; the leaching residue is cleaned and filtered with hydrochloric acid to obtain anatase titanium dioxide and cleaning solution, and the cleaning solution is evaporated and crystallized to obtain NaCl; the leaching solution is Continue to mix with sodium hydroxide sub-molten salt to carry out sub-molten salt leaching behavior, and recycle the leach solution until the tungsten content in the solution reaches 6%, stop the circulation; add hydrochloric acid and chloride to the leach solution with a m...

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Abstract

The invention belongs to the field of solid waste resource utilization, and relates to a sub-molten salt method for totally recycling vanadium, tungsten and titanium from a waste denitration catalyst. The sub-molten salt method mainly comprises the processes of pretreatment, sub-molten salt leaching, titanium dioxide recycling, lixivium cyclic utilization, calcification sedimentation, vanadium and tungsten separation, calcium removing, vanadium removing and the like. Compared with the prior art, a sub-molten salt treatment process is adopted, reaction energy consumption can be effectively reduced, green recycling and zero exhaust gas emission can be achieved, and the recycling economic value can be increased; and meanwhile, the recycling treatment process is simpler and easier to operate, waste residues and waste liquid in the process are fully recycled, economic input is reduced, and secondary pollution is prevented from being generated to the environment.

Description

technical field [0001] The invention relates to a method for recovering vanadium, tungsten and titanium from waste denitration catalysts, in particular to a method for green recovery of vanadium and tungsten in waste denitration catalysts by using sub-molten salt reaction, and belongs to the technical field of recovery of vanadium, tungsten and titanium metals. Background technique [0002] Vanadium-titanium-based catalysts in coal-fired power plants will gradually age over time due to complex flue gas in the working system and changes in operating conditions. The general life span is 3 to 5 years. If low-quality coal or biomass coal mixed fuel , the catalyst deactivation rate will be accelerated by 3 to 4 times. At present, the installed capacity of SCR in my country's thermal power plants has reached 215 million kilowatts, and the SCR market capacity has grown at a rate of 100 million kilowatts per year. Since 2012, a large number of domestic SCR catalysts have been used t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/22C22B34/36C22B34/12
CPCC22B7/008C22B34/1245C22B34/225C22B34/365Y02P10/20
Inventor 吴玉锋李如冰潘德安王维李彬
Owner BEIJING UNIV OF TECH
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