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A method for preparing a denitration catalyst from a secondary resource of neodymium iron boron

A technology for denitration catalyst and secondary resources, applied in the field of preparation of selective catalytic reduction (SCR) flue gas denitration catalyst, can solve the problems of high material consumption and energy consumption, long process flow of regeneration rare earth, unsatisfactory recovery rate, etc., and achieve good catalytic performance. performance, good anti-poisoning performance, the effect of excellent N2 selectivity

Active Publication Date: 2020-07-03
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of regenerating rare earth from NdFeB secondary resources is long, the material consumption and energy consumption are high, and the recovery rate is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve the NdFeB secondary resources with nitric acid, add manganese nitrate and cerium nitrate during the acid dissolution process to obtain the precursor solution of the denitration catalyst, and then add titanium sulfate to the precursor solution, and the metal elements in it are converted into the corresponding oxidation The mass percentage of the substance is Nd 2 o 3 : 5%, Fe 2 o 3 : 20%, TiO 2 : 60%, MnO 2 : 13%, CeO 2 :2%. Ammonia water was used to adjust the pH value to 7 for precipitation, and the precipitate was calcined at 350° C. for 4 hours to obtain a composite metal oxide denitration catalyst. The catalyst has a conversion rate of 99.5% and a selectivity of 95% at 160-450°C.

Embodiment 2

[0025] Dissolve NdFeB secondary resources with sulfuric acid, add manganese nitrate and cerium nitrate during the acid dissolution process to obtain the precursor solution of the denitration catalyst, and then add titanium tetrachloride to the precursor solution, and the metal elements in it are converted into corresponding The oxide mass percentage is Nd 2 o 3 : 4.5%, Fe 2 o 3 : 17%, TiO 2 : 71%, MnO 2 : 5%, CeO 2 : 2.5%. Using urea to adjust the pH value to 6 for precipitation, and roasting the precipitate at 400° C. for 3.5 hours to obtain a composite metal oxide denitration catalyst. The catalyst has a conversion rate of 98.5% at 160-450°C and a selectivity of 98%.

Embodiment 3

[0027] Dissolve the NdFeB secondary resources with hydrochloric acid, add manganese nitrate and cerium nitrate during the acid dissolution process to obtain the precursor solution of the denitration catalyst, and then add titanium sulfate + titanium tetrachloride to the precursor solution, the metal elements in it Converted to the corresponding oxide mass percentage as Nd 2 o 3 : 4%, Fe 2 o 3 : 14%, TiO 2 : 75%, MnO 2 : 6%, CeO 2 :1%. Sodium hydroxide was used to adjust the pH value to 14 for precipitation, and the precipitate was calcined at 450° C. for 3.5 hours to obtain a composite metal oxide denitration catalyst. The catalyst has a conversion rate of 99% at 160-450°C and a selectivity of 97.5%.

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Abstract

The invention mainly belongs to the technical field of secondary resource high-value utilization and industrial smoke gas denitration, and particularly relates to a method for preparing a SCR (selective catalytic reduction) smoke gas denitration catalyst from neodymium iron boron secondary resources. The invention discloses a method for preparing a denitration catalyst from neodymium iron boron secondary resources. The neodymium iron boron secondary resources comprise neodymium iron boron production process waste materials and scrapped neodymium iron boron devices. The denitration catalyst isprepared from neodymium ferric oxide and titanium dioxide; one or two kinds of materials of manganese and cerium oxides are added; the mass percentage of Nd2O3 is 0.5 to 5 percent; the mass percentageof Fe2O3 is 1.5 to 20 percent; the mass percentage of TiO2 is 60 to 95 percent; the mass percentage of MnO2 and CeO2 is 0 to 15 percent. For the catalyst, the NOx conversion rate at 160 to 450 DEG Cis 90 percent or higher; the N2 selectivity reaches 95 percent or higher; good anti-poisoning performance is realized.

Description

technical field [0001] The invention mainly belongs to the technical field of high-value utilization of secondary resources and industrial flue gas denitrification, and specifically relates to a method for preparing a selective catalytic reduction (SCR) flue gas denitrification catalyst by using NdFeB secondary resources. Background technique [0002] NdFeB is widely used in various fields due to its excellent permanent magnetic properties. About 25% of the process waste will be generated during its production and processing, and the number of scrapped NdFeB devices is increasing year by year, resulting in an increasing amount of NdFeB secondary resources. NdFeB secondary resources contain about 30% rare earth elements by mass fraction, including neodymium, praseodymium, dysprosium, terbium, etc., and are important raw materials for renewable rare earth elements. The process of regenerating rare earths from NdFeB secondary resources is long, the material consumption and ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/8892B01J2523/00B01J2523/3712B01J2523/3725B01J2523/47B01J2523/72B01J2523/842
Inventor 张深根张柏林刘波
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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