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Method for selective recovery of valuable metal from waste denitrification catalyst through alkali fusion

A technology for denitrification catalyst and valuable metals, applied in the direction of improving process efficiency, etc., can solve the problems of separation and recovery of valuable metals, increased roasting time, and no separation and recovery of titanium dioxide.

Pending Publication Date: 2020-03-31
KOREA INST OF GEOSCI & MINERAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the above-mentioned patents, vanadium and tungsten can be recovered in the form of oxides, but the energy efficiency is low due to the increase in calcination time, and there is no means for separately separating and recovering titanium dioxide, so there is a problem that selective separation and recovery cannot be achieved. Valuable Metal Questions

Method used

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  • Method for selective recovery of valuable metal from waste denitrification catalyst through alkali fusion
  • Method for selective recovery of valuable metal from waste denitrification catalyst through alkali fusion
  • Method for selective recovery of valuable metal from waste denitrification catalyst through alkali fusion

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Embodiment approach

[0059] figure 1 A process flow of a method for selectively recovering valuable metals from spent denitrification catalysts by alkali melting according to an embodiment of the present invention is shown.

[0060] refer to figure 1 , the method for selectively recovering valuable metals from spent denitrification catalysts by alkali fusion comprises: step (a), adding alkali metals to waste denitrification catalysts for mixing and generating roasted products by alkali fusion; step (b) , by leaching the above-mentioned roasted product with water to recover the alkaline leach solution and the residue; step (c), adding a precipitant to the above-mentioned alkaline leach solution, and recovering by stirring to precipitate calcium metavanadate or calcium tungstate; and In step (d), the recovered calcium tungstate is subjected to acid hydrolysis to prepare tungstic acid.

[0061] Specific Embodiments of the Invention

[0062] Hereinafter, preferred embodiments of the present inventi...

Embodiment 1

[0137] Embodiment 1. selectively recovers valuable metals by alkali fusion

[0138] The spent denitrification catalyst was prepared and pulverized, and analyzed by inductively coupled atomic emission spectrometry (ICP-AES).

[0139] It is confirmed that it is an oxide form of vanadium, tungsten, and titanium, and the firing conditions for alkali fusion are derived.

[0140] First prepare the spent denitrification catalyst of 300g, add 1.2 equivalents of sodium hydroxide (NaOH) relative to the spent denitrification catalyst, and in order to reclaim titanium, add 2 equivalents of sodium hydroxide relative to the spent denitrification catalyst, with the same Method for alkali fusion.

[0141] The power of microwave is adjusted to 3kw, alkali fusion is carried out for 20 minutes at 1.2 equivalents, and alkali fusion is carried out at 2 equivalents for 60 minutes.

[0142] Alkali fusion is carried out at a temperature of 900°C to 1000°C.

[0143] After alkali fusion, the pulp de...

Embodiment 2

[0146] Embodiment 2. selectively recover titanium dioxide

[0147] Hydrochloric acid was added to the residue of Example 1 to adjust the pH to 2 or less, and the reaction was carried out at a temperature of 50° C. for 2 hours to perform acid leaching. Sodium hydroxide was added again for precipitation, and the recovered precipitate was calcined at a temperature of 900K for 5 hours to recover titanium dioxide with a purity of 90% or more.

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Abstract

The present invention provides a method for selective recovery of a valuable metal from a waste denitrification catalyst through alkali fusion, the method comprising the steps of: (a) adding an alkalimetal to a waste denitrification catalyst, followed by mixing and alkali fusion, to generate a calcination product; (b) subjecting the calcination product to water-leaching to recover an alkali leachate and a residue; (c) adding a precipitator to the alkali leachate, followed by stirring, to recover calcium metavanadate (Ca(VO3)2) or calcium tungstate (CaWO4) through precipitation; and (d) subjecting the recovered calcium tungstate to acid decomposition to prepare tungstic acid. Therefore, vanadium and tungsten can be recovered at high efficiency by a method in which a precipitator is added to a leachate, which is obtained by adding an excess amount of an alkali metal to a waste denitrification catalyst and carrying out calcination and water-leaching, and then a reaction rate is controlled.

Description

technical field [0001] The invention relates to a recovery method capable of selectively recovering valuable metals such as vanadium, tungsten and titanium from waste denitrification catalysts. Background technique [0002] Recently, as the world's attention to climate change and global warming has increased, air pollutants discharged from various power plants, incineration plants, chemical plants, etc. have become a problem. In particular, since nitrogen oxides (hereinafter "NO X ”) are not only harmful to the human body, but also are representative air pollutants that cause various environmental problems such as ozone formation in the atmosphere and acid rain, and their control is being strengthened. [0003] Selective catalytic reduction (selective catalytic reduction, hereinafter "SCR") is used in power plants to discharge NO X The most commonly used NO X Adjustment method. This method has the characteristics of efficiency, selectivity, and economy. The installation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/36C22B1/02C22B3/12C22B3/20C22B34/12
CPCC22B1/02C22B3/12C22B34/1236C22B34/365Y02P10/20C22B34/225C22B3/205C22B1/16C22B7/008C22B7/009C22B34/124
Inventor 李珍荣姜正信姜熙南
Owner KOREA INST OF GEOSCI & MINERAL RESOURCES
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