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Regeneration and resource utilization method of thallium poisoning SCR denitration catalyst

A denitrification catalyst and catalyst technology, applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, catalyst activation/preparation, etc., to achieve the effect of avoiding secondary pollution of catalysts, simple and efficient methods, and less loss

Active Publication Date: 2020-08-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in recent years, few denitrification catalyst regeneration technologies for thallium poisoning have been researched and disclosed in this field.

Method used

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  • Regeneration and resource utilization method of thallium poisoning SCR denitration catalyst

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Experimental program
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Effect test

Embodiment 2

[0050]The spent catalyst after one year of use in a cement plant will be physically cleaned to remove the dust on the surface of the catalyst and dredge the pores.

[0051] Step 2: Soak the catalyst in deionized water at 80°C with 50KHz ultrasonic treatment for 60 minutes to completely wash away the poisoned thallium sulfate and other soluble impurities on the surface of the catalyst, exposing the thallium trioxide tightly wrapped on the surface of the catalyst (Tl 2 o 3 )Floor.

[0052] Step 3: Soak the washed catalyst in 0.2M dilute sulfuric acid washing solution and treat it with 50KHz ultrasonic for 60min. The layer of thallium trioxide is dissolved to recover the active sites of the catalyst.

[0053] Step 4: Use a high-pressure water gun to clean the surface of the pickled catalyst to remove residual dilute sulfuric acid and thallium sulfate.

[0054] Step five: drying the catalyst at 60°C for 12 hours.

[0055] Step 6: using the waste heat co-processing solid waste...

Embodiment 3

[0058] Step 1: Physically clean up the spent catalyst after one year of use in a cement plant, remove the ash on the surface of the catalyst and dredge the pores.

[0059] Step 2: Soak the catalyst in deionized water at 80°C with 50KHz ultrasonic treatment for 60 minutes to completely wash away the poisoned thallium sulfate and other soluble impurities on the surface of the catalyst, exposing the thallium trioxide tightly wrapped on the surface of the catalyst (Tl 2 o 3 )Floor.

[0060] Step 3: Soak the washed catalyst in 0.4M dilute sulfuric acid washing solution and treat it with 50KHz ultrasonic for 60min. The layer of thallium trioxide is dissolved to recover the active sites of the catalyst.

[0061] Step 4: Use a high-pressure water gun to clean the surface of the pickled catalyst to remove residual dilute sulfuric acid and thallium sulfate.

[0062] Step five: drying the catalyst at 60°C for 12 hours.

[0063] Step 6: using the waste heat co-processing solid waste ...

Embodiment 4

[0066] Step 1: Physically clean up the spent catalyst after one year of use in a cement plant, remove the ash on the surface of the catalyst and dredge the pores.

[0067] Step 2: Treat the catalyst at 510°C for 30 minutes in a mixture of nitrogen and hydrogen with a hydrogen content of 1%, and the space velocity of the mixed gas is 60000h -1 . The Tl in the thallium trioxide layer is replaced by hydrogen 3+ reduced to Tl + . At the same time at this temperature, because of the thiophilic nature of thallium, Tl + It will react with the residual ammonium bisulfate (ABS) on the surface of the catalyst to convert the thallium trioxide on the surface of the catalyst into thallium sulfate.

[0068] Step 3: Soak the catalyst treated with hydrogen gas mixture in deionized water at 80°C and accompany it with 50KHz ultrasonic treatment for 60 minutes to completely wash away the poisoning substance thallium sulfate and other soluble impurities on the surface of the catalyst, so that...

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Abstract

The invention belongs to the field of waste catalyst regeneration and resource utilization, and particularly relates to an acid pickling regeneration method of a thallium poisoning SCR denitration catalyst, which comprises the following steps: 1, cleaning a waste catalyst in a physical mode; 2, soaking the catalyst in deionized water for ultrasonic treatment; step 3, recovering the active sites ofthe catalyst; 4, cleaning the surface of the catalyst subjected to acid pickling by using high-pressure water to remove residual dilute sulfuric acid and thallium sulfite; and 5, drying the catalyst.The method is simple and efficient, the strength of a catalyst matrix is not damaged; compared with the traditional regeneration method, the method provided by the invention has the advantages of less loss of active components, no need of active supplementation, no introduction of sodium, potassium, calcium and other components harmful to the catalyst, avoiding of secondary pollution of the catalyst, and realization of artificial enrichment and recycling of a highly toxic substance thallium, so that the highly toxic substance thallium is converted into an industrial raw material from a substance poisoning the catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalyst regeneration, and in particular relates to a method for regeneration and resource utilization of a thallium poisoned SCR denitrification catalyst. Background technique [0002] With the increasingly stringent national environmental protection policies, flue gas denitrification in non-power industries is imperative. Different from traditional coal-fired power plants, the non-electric power industry has the characteristics of wide industrial distribution, complex use of raw materials, and large differences in flue gas temperature and ash content, which pose challenges to the long-term stable operation of SCR denitrification catalysts. Thallium (Tl) is a typical rare dispersed element, and its content in the earth's crust is about 3 / 100,000. Thallium has dual properties of lithophile and sulfurophile. As a lithophile element, it exists in mineral raw materials such as mica, potassium feldspar, mang...

Claims

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Application Information

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IPC IPC(8): B01J37/34B01J38/60B01J38/00B01D53/86B01D53/56
CPCB01D53/8628B01J37/343B01J38/00B01J38/60
Inventor 彭悦李俊华黄旭陈建军刘长东赵会民
Owner TSINGHUA UNIV
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