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Process for wholly recycling valuable metals in waste SCR denitration catalysts through wet method

A technology for denitrification catalysts and valuable metals, which is applied in the field of overall wet recovery of valuable metals in invalid SCR denitrification catalysts, can solve the problems of wasting costs, occupying land resources, etc., and achieve the effect of reducing resource waste and avoiding environmental pollution

Inactive Publication Date: 2015-10-28
FUJIAN ZIJIN ENVIRONMENT ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the domestic landfills are still in the landfill method, which takes up a lot of land resources and wastes a lot of money.

Method used

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  • Process for wholly recycling valuable metals in waste SCR denitration catalysts through wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 1 Shown: In this embodiment, valuable metals are recovered from the spent SCR denitration catalyst, and the whole wet process is adopted, and the process is carried out according to the following steps.

[0041] Removal of heavy metal impurities: the spent SCR denitrification catalyst was put into 5% hydrochloric acid for pickling, deionized water washing, and then roasted at 600°C for 3 hours in a tunnel kiln to remove Hg, As and organic substances that may be adsorbed on the surface. Impurities.

[0042] Sodiumization and crushing: adding Na to the spent SCR denitrification catalyst after removing heavy metal impurities 2 CO 3 , Na 2 CO 3 With the exhausted SCR denitration catalyst (with TiO 2 The molar ratio of the mixture is 2:1. After being fully mixed by a mixer, it is roasted in a tunnel kiln at 650°C for 3 hours, and then put into a crusher for crushing and grinding to 100 mesh to obtain a mixed powder.

[0043] Separation and filtration: So...

Embodiment 2

[0048] Such as figure 1 Shown: In this embodiment, valuable metals are recovered from the spent SCR denitration catalyst, and the whole wet process is adopted, and the process is carried out according to the following steps.

[0049] Removal of heavy metal impurities: put the spent SCR denitrification catalyst into 7% hydrochloric acid for pickling, washing with deionized water, and then roasting at 600°C for 3 hours in a tunnel kiln to remove Hg, As and organic substances that may be adsorbed on the surface. Impurities.

[0050] Sodiumization and crushing: adding Na to the spent SCR denitrification catalyst after removing heavy metal impurities 2 CO 3 , Na 2 CO 3 With the exhausted SCR denitration catalyst (with TiO 2 The molar ratio of the powder is 2.5:1. After being fully mixed by a mixer, it is roasted in a tunnel kiln at 650°C for 4 hours, and then put into a crusher for crushing and grinding to 100 mesh to obtain a mixed powder.

[0051] Separation and filtration:...

Embodiment 3

[0056] Such as figure 1 Shown: In this embodiment, valuable metals are recovered from the spent SCR denitration catalyst, and the whole wet process is adopted, and the process is carried out according to the following steps.

[0057] Removal of heavy metal impurities: The spent SCR denitrification catalyst was put into 9% hydrochloric acid for pickling, deionized water washing, and then roasted at 600°C for 3 hours in a tunnel kiln to remove Hg, As and organic substances that may be adsorbed on the surface. Impurities.

[0058] Sodiumization and crushing: adding Na to the spent SCR denitrification catalyst after removing heavy metal impurities 2 CO 3 , Na 2 CO 3 With the exhausted SCR denitration catalyst (with TiO 2 The molar ratio of the mixture is 3:1. After being fully mixed by a mixer, it is roasted in a tunnel kiln at 650°C for 5 hours, and then put into a crusher for crushing and grinding to 100 mesh to obtain a mixed powder.

[0059] Separation and filtration: so...

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Abstract

The invention discloses a process for wholly recycling valuable metals in waste SCR denitration catalysts through a wet method. The process is mainly used for common SCR denitration catalysts with TiO2 as carriers and V2O5-WO3(MoO3) and other metal oxides as main active ingredients. Different precipitants are added to the pretreated waste SCR denitration catalysts, and TiO2 powder, V2O5 crystals and WO3 or MoO3 are sequentially obtained through procedures such as filtration and calcination. By the adoption of the process, the valuable metal oxides of the waste SCR denitration catalysts can be effectively recycled, and considerable economic benefits are acquired while environmental problems are solved and resources are saved.

Description

technical field [0001] The invention belongs to the technical field of recovering spent SCR denitrification catalysts, and in particular relates to a process for recovering valuable metals in spent SCR denitrification catalysts by an integral wet method. Background technique [0002] Coal-fired power generation in my country also produces a large amount of nitrogen oxides (NOx) while promoting economic development. NOx is a very harmful air pollutant, which can cause environmental problems such as photochemical smog and acid rain, and also threatens human health at all times. To this end, my country's "Twelfth Five-Year Plan" comprehensively carried out NOx emission reduction projects. There are two ways to reduce NOx emissions: combustion process control and post-combustion flue gas denitrification. In actual production, the efficiency of low NOx combustion technology is low, and flue gas denitrification technology is mainly used. At present, the SCR denitrification tech...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/12C22B34/22C22B34/36C22B34/34
CPCY02P10/20
Inventor 王洪明黄丽明杨广华林苏芳
Owner FUJIAN ZIJIN ENVIRONMENT ENG TECH
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