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Method for treating spent catalyst by utilizing magnetite in sintering process

A technology of invalid catalyst and sintering process, which is applied in the direction of improving process efficiency, can solve the problems caused by sintering, and achieve the effect of avoiding quality deterioration and solving the problem of low-temperature reduction and differentiation

Active Publication Date: 2020-10-13
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to, aiming at the problem in the prior art that the spent SCR catalyst is returned to sintering for processing, it is easy to have an impact on sintering, and a method of utilizing magnetite to process the spent catalyst in the sintering process is provided; Pre-granulate the expired SCR catalyst and sintered magnetite to avoid its impact on the sintering output and quality indicators

Method used

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Embodiment 1

[0038] The invention proposes a method for treating spent catalysts in a sintering process by utilizing magnetite, which can properly solve the resource utilization problem of spent catalysts. The sinter produced by this method can meet the various metallurgical performance indicators of the sinter required by the blast furnace. At the same time, it can also use metal elements such as V, W, and Ti in the spent catalyst, which has a positive effect on the protection of the blast furnace lining and the optimization of the quality of molten iron. It provides a new treatment method for the efficient utilization of spent catalysts.

[0039] Concrete experimental steps of the present invention are as follows:

[0040] Step 1: Raw material pretreatment

[0041] (1) Treatment and crushing of spent catalyst: Take the spent SCR catalyst used in the industrial field, treat and break the spent catalyst: remove the blockage in the pores of the catalyst, and then use strong wind to remove ...

Embodiment 2

[0085] The basic process of the new method of using the sintering procedure to process the spent catalyst of the present embodiment is the same as that of Example 1, the difference is that the spent catalyst add-on of the present embodiment accounts for 1% of the weight percentage a of the total raw material for sintering, and the sintered magnetite add-on Accounting for sintering total raw material weight percentage b is 4.08%, therefore, the mass percent of each component of the dry material of sintering mixture is: card powder: 10.66%, Brazilian mixed powder: 4.52%, wool tower powder: 3.09%, Pb powder: 15.63%, Newman powder: 3.13%, Yangdi powder: 11.15%, dirty ore: 0.55%, sintered magnetite powder: 5.94%, returned ore: 24.38%, limestone: 3.98%, dolomite: 4.38%, quicklime: 3.13%, fuel: 4.38%, pre-granulated pellets containing spent catalyst: 5.08%, sinter production quality indicators and sinter metallurgical properties are shown in Table 2.

Embodiment 3

[0089] The basic process of the new method of using the sintering process to process the spent catalyst in this embodiment is the same as in Example 1, the difference is that the amount of spent catalyst used for pre-granulation accounts for 2% of the weight percentage a of the total raw material for sintering in this embodiment. The amount of sintered magnetite added in the pre-granulation accounted for 8.16% of the weight percentage b of the total raw material for sintering. Therefore, the mass percentages of each component of the dry material of the sintered mixture are: card powder: 10.55%, Brazil mixed powder: 4.47%, Raw tower powder: 3.06%, Pb powder: 15.47%, Newman powder: 3.10%, Yangdi powder: 11.04%, dirty ore: 0.54%, sintered magnetite powder: 1.76%, returned ore: 24.13%, limestone: 3.94 %, dolomite: 4.33%, quicklime: 3.10%, fuel: 4.33%, pre-granulated pellets containing spent catalyst: 10.16%, sintering production quality indicators and sintering metallurgical proper...

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Abstract

The invention discloses a method for treating a spent catalyst by utilizing magnetite in a sintering process, and belongs to the technical field of catalyst recovery. The method comprises the following steps that pre-granulation on a spent catalyst containing TiO2 and magnetite is conducted, and adding is conducted to other sintering raw materials for sintering after pre-granulation. According tothe method, the TiO2 in the spent catalyst reacts with the magnetite to form a phase product which does not affect sintering quality, the sintering quality is guaranteed, and effective processing on the spent catalyst is further conducted.

Description

technical field [0001] The invention relates to the technical field of catalyst recovery, and more specifically relates to a method for using magnetite to process spent catalysts in a sintering process. Background technique [0002] Nitrogen oxides (NOx) contained in industrial coal-fired flue gas are currently one of the main air pollutants. As the country strengthens environmental protection requirements, the reduction of NOx emissions from industrial coal-fired flue gas has been pushed to the forefront. Currently NH 3 -SCR denitrification is widely used because of its high denitrification efficiency. NH 3 - One of the keys to SCR denitrification lies in the use of catalysts. The catalyst widely used in the market is V 2 o 5 -WO 3 / TiO 2 Catalyst; however, during the use of the catalyst, the catalyst is prone to deactivation, and the partially deactivated catalyst cannot be reused, so it must be disposed of, and the current policy has strict requirements on the dispo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C22B1/16
CPCC22B1/248C22B1/16Y02P10/20
Inventor 龙红明丁龙钱立新杨涛汪名赫罗云飞章裕东王毅璠余正伟孟庆民春铁军丁成义雷杰
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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