Waste SCR catalyst-containing titanium-containing pellet and preparation method thereof

A technology of SCR catalyst and catalyst, which is applied in blast furnaces, furnace types, furnaces, etc., can solve the problems of impact on pellet performance and difficulty in forming pellets, and achieve the effects of good static pelletization, strong water absorption, and excellent metallurgical properties

Active Publication Date: 2021-06-22
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems that the traditional production process of titanium-containing pellets is difficult to form into pellets and the performance of the pellets is easily affected, a titanium-containing pellet containing waste SCR catalyst and its preparation method are provided; the method provided by the invention can obviously Improve the properties of pellets such as green pellet strength, compressive strength, burst temperature, and roasted pellet strength without affecting pellet production indicators, and provide a new method for the harmless and resource-efficient utilization of waste SCR denitrification catalysts

Method used

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  • Waste SCR catalyst-containing titanium-containing pellet and preparation method thereof
  • Waste SCR catalyst-containing titanium-containing pellet and preparation method thereof
  • Waste SCR catalyst-containing titanium-containing pellet and preparation method thereof

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Embodiment 1

[0073] The present invention proposes a method for preparing titanium-containing pellets containing waste SCR catalysts, which can properly solve the problems that the current waste SCR catalysts are produced in large quantities and difficult to recycle, the traditional production process of titanium-containing pellets is difficult to form into pellets, and the technology of pellets has poor performance question. The pellets produced by this method can meet the various performance indicators of the pellets required by the blast furnace, and can also provide a new treatment method for the harmless and efficient utilization of waste SCR denitrification catalysts.

[0074] Concrete experimental steps of the present invention are as follows:

[0075] Step 1: Raw material pretreatment

[0076] (1) Waste catalyst preparation: take the waste SCR catalyst, pre-treat to remove the blockage fly ash in the waste catalyst, then crush and grind to obtain -200 mesh catalyst powder;

[007...

Embodiment 2

[0110] In this embodiment, the basic process of using the waste SCR catalyst as a binder to produce titanium-containing pellets is the same as that in Embodiment 1, the difference is that the proportion of waste catalyst added in the waste catalyst pellets of this embodiment accounts for the total amount of iron-containing raw materials. The mass percentage is 2.5%, and the addition ratio of the liquid phase additive accounts for 2.5% of the total mass percentage of the iron-containing raw materials. After mixing, add water to the disc pelletizer to produce pellets. After the pelletization is completed, the performance of the green pellets (drop strength, compressive strength, burst temperature) is tested, and the resistance to the pellets after roasting is tested. The compressive strength was measured, and the experimental results are recorded in Table 3.

Embodiment 3

[0112] In this embodiment, the basic process of using the waste SCR catalyst as a binder to produce titanium-containing pellets is the same as that in Embodiment 1, the difference is that the proportion of waste catalyst added in the waste catalyst pellets of this embodiment accounts for the total amount of iron-containing raw materials. The mass percentage is 7.5%, and the addition ratio of the liquid phase additive accounts for 7.5% of the total mass percentage of the iron-containing raw material. After mixing, it is added to the disc pelletizer to replenish water to produce pellets. After the pelletization is completed, the pellet performance ( Green pellet drop strength, compressive strength, burst temperature) detection, and the compressive strength of the pellets after roasting were measured, the experimental results are recorded in Table 3.

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Abstract

The invention relates to a waste SCR catalyst-containing titanium-containing pellet and a preparation method thereof, and belongs to the technical field of waste catalyst recovery. The pellet comprises an iron-containing raw material, catalyst powder and a liquid phase auxiliary agent, the catalyst powder is waste SCR catalyst powder, the catalyst powder contains titanium oxide, and the titanium oxide content is not less than 60%; the liquid phase additive can form a low-melting-point substance, and the melting point of the low-melting-point substance is lower than 1230 DEG C. According to the pellet, effective recycling is carried out on the waste SCR catalyst, volume reduction, harmlessness and resourceful treatment of the waste SCR catalyst is achieved, by utilizing the bonding effect generated after the waste SCR catalyst powder is added, the pellet has excellent metallurgical performance, and finally, the pellet with good performance indexes such as green pellet falling and compressive strength, decrepitation temperature, compressive strength after roasting and the like is produced.

Description

technical field [0001] The invention relates to the technical field of recovery of waste catalysts, in particular to a titanium-containing pellet containing waste SCR catalyst and a preparation method thereof. Background technique [0002] Titanium-containing pellets are a raw material used for blast furnace protection. In the past, vanadium-titanium magnetite was used in the production of titanium-containing pellets. Due to the poor spheroidization of vanadium-titanium magnetite, a large amount of bonding is often required in the pelletizing process. agent, resulting in high production costs, but the quality of the pellets is still poor. [0003] At the same time, waste SCR denitrification catalyst is a kind of hazardous solid waste. If it is randomly piled up or disposed of improperly, it is very likely to cause serious harm to the natural environment and human health, and it will also cause a waste of resources. The current policy has strict requirements on the disposal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/00C22B1/02C21B5/00
CPCC22B1/243C22B1/2406C22B1/005C22B1/02C21B5/00Y02P10/20
Inventor 龙红明杨涛余正伟钱立新丁龙刘爽汪名赫王毅璠雷杰孟庆民春铁军丁成义
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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