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Method for preparing denitrification catalyst from waste rare earth fluorescent powder

A technology of rare earth fluorescent powder and denitrification catalyst, applied in the field of denitrification catalyst, to achieve good economic value and environmental protection value, short process and wide operating temperature

Active Publication Date: 2020-12-04
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (application number: 201710372413.6) discloses a mixed rare earth denitrification catalyst and its preparation method. The denitrification catalyst with alumina as the carrier and transition metal doped mixed rare earth oxide is prepared by impregnation method. It has high catalytic efficiency and a wide reaction temperature window. wide characteristics, but the maceration method also produces a large amount of waste water

Method used

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  • Method for preparing denitrification catalyst from waste rare earth fluorescent powder
  • Method for preparing denitrification catalyst from waste rare earth fluorescent powder
  • Method for preparing denitrification catalyst from waste rare earth fluorescent powder

Examples

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Effect test

Embodiment 1

[0026] Example 1 Weigh 44wt% waste rare earth fluorescent powder, 30wt% sodium hydroxide, 20wt% potassium hydroxide, 2wt% manganese nitrate, 2wt% manganese trioxide, 1wt% cobalt nitrate, 1wt% cobalt oxide, and mix Fully even. Calcined at 800° C. for 2 hours, and ball-milled the product for 24 hours at a ball-to-material ratio of 5:1 to obtain a composite oxide denitration catalyst with a particle size of 50 μm. The prepared catalyst has a denitrification efficiency of 96% at 140°C, and can deeply remove sulfur dioxide in flue gas, with a sulfur dioxide concentration of 25mg / m 3 , and has good resistance to water and sulfur dioxide poisoning.

Embodiment 2

[0027] Example 2 Weigh 39wt% waste rare earth phosphor, 55wt% sodium hydroxide, 5wt% manganese nitrate, and 1wt% cobalt nitrate by mass fraction, and mix well and evenly. Calcined at 900° C. for 1 hour, and ball milled the product for 24 hours at a ball-to-material ratio of 5:1 to obtain a composite oxide denitration catalyst with a particle size of 50 μm. The prepared catalyst has a denitrification efficiency of 91.5% at 150 °C (see figure 2 ), can deeply remove sulfur dioxide in the flue gas, the concentration of sulfur dioxide is 15mg / m 3 , and has good resistance to water and sulfur dioxide poisoning.

Embodiment 3

[0028] Example 3 Weigh 50wt% waste rare earth phosphor, 42wt% sodium hydroxide, 5wt% manganese nitrate, and 3wt% cobalt nitrate by mass fraction, and mix well and evenly. It was calcined at 800°C for 2 hours, and the product was ball milled for 20 hours at a ball-to-material ratio of 6:1 to obtain a composite oxide denitration catalyst with a particle size of 60 μm. The prepared catalyst has a denitrification efficiency of 92% at 160°C, and can deeply remove sulfur dioxide in flue gas, with a sulfur dioxide concentration of 25mg / m 3 , and has good resistance to water and sulfur dioxide poisoning.

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Abstract

The invention provides a method for preparing a denitration catalyst from waste rare earth phosphor and belongs to the field of denitration catalysts. After waste rare earth phosphor, alkali, a manganese compound, a cobalt compound and the like are mixed uniformly, the mixture is calcined at 500-900 DEG C and subjected to ball milling, and the composite oxide denitration catalyst is obtained. Thecatalyst has the denitration efficiency of 90% or above at 140-500 DEG C, can deeply remove sulfur dioxide with the concentration smaller than 35 mg / m<3> and has good anti-poisoning capability. High-value utilization of the waste rare earth phosphor is realized, and the prepared catalyst does not contain toxic elements and has the characteristics of short procedure, good smoke treatment effect andthe like.

Description

technical field [0001] The invention relates to a method for preparing a denitration catalyst from waste rare earth fluorescent powder, and belongs to the field of denitration catalysts. Background technique [0002] Nitrogen oxides are one of the main pollutants in the atmosphere, and its treatment technology is mainly selective catalytic reduction (SCR), which uses reducing gases to reduce nitrogen oxides to nitrogen through catalysis. Catalyst is the decisive factor to determine the effect of nitrogen oxide treatment. The commercial vanadium-tungsten-titanium system catalyst has high denitrification efficiency at high temperature, but it contains vanadium pentoxide, which is highly toxic. On December 26, 2016, the Ministry of Industry and Information Technology, the Ministry of Science and Technology, and the Ministry of Environmental Protection officially released the "Catalogue of Toxic and Hazardous Raw Materials (Products) Substitutes Encouraged by the State (2016 Edi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/60
CPCB01D53/8637B01J23/002B01J23/8892B01J2523/00B01J2523/12B01J2523/13B01J2523/72B01J2523/845Y02A50/20
Inventor 张深根黎琳刘波
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD