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Method for recovering Ti, V, Mo and Si in SCR (selective catalytic reduction) waste catalyst by combination of activation calcination and acid leaching

A waste catalyst and acid leaching technology, which is applied in the direction of silicate, magnesium silicate, process efficiency improvement, etc., can solve the problems of few reports on the recovery of flat-plate waste catalyst, large amount of acid usage, danger, etc., and shorten the acid The effect of processing time, reducing concentration and saving cost

Active Publication Date: 2014-12-03
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of method uses concentrated sulfuric acid to dissolve the spent catalyst, high temperature and high pressure leaching, the amount of acid used is large, the treatment cost is high, and there are certain risks at the same time, which is not conducive to popularization and application
At the same time, most of the current patents focus on the recovery of honeycomb spent catalysts, while there are few reports on the recovery of flat plate spent catalysts

Method used

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  • Method for recovering Ti, V, Mo and Si in SCR (selective catalytic reduction) waste catalyst by combination of activation calcination and acid leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as figure 1 As shown, in this embodiment, a method for recovering Ti, V, Mo, and Si in spent SCR catalysts by activating calcination combined with acid leaching is carried out according to the following steps.

[0049] Raw material crushing: The honeycomb catalyst is directly crushed by a crusher to more than 100 mesh; the flat-plate catalyst is first crushed by a crusher, so that the active components of the catalyst are stripped from the steel mesh, and then the iron filings in the catalyst and the steel mesh are separated by two-stage magnetic separation technology .

[0050] Sodium roasting: Take the pulverized catalyst and mix it evenly with NaCl, the amount of NaCl is the mass of NaCl: catalyst mass = 0.2, put it into a rotary kiln and roast at a high temperature at 700 °C for 4 h at a constant temperature. Under high temperature conditions, the metal oxides in the catalyst react with NaCl to form the corresponding sodium salts.

[0051] Acidic leaching: Af...

Embodiment 2

[0059] Such as figure 1 As shown, in this embodiment, a method for recovering Ti, V, Mo, and Si in spent SCR catalysts by activating calcination combined with acid leaching is carried out according to the following steps.

[0060] Raw material crushing: The honeycomb catalyst is directly crushed by a crusher to more than 100 mesh; the flat-plate catalyst is first crushed by a crusher, so that the active components of the catalyst are stripped from the steel mesh, and then the iron filings in the catalyst and the steel mesh are separated by two-stage magnetic separation technology .

[0061] Sodium roasting: Take the pulverized catalyst and mix it evenly with NaCl, the amount of NaCl is the mass of NaCl: Catalyst mass = 0.2, put it into a rotary kiln and roast at a high temperature at 800 °C for 4 h at a constant temperature. Under high temperature conditions, the metal oxides in the catalyst react with NaCl to form the corresponding sodium salts.

[0062] Acid leaching: Afte...

Embodiment 3

[0070] Such as figure 1 As shown, in this embodiment, a method for recovering Ti, V, Mo, and Si in spent SCR catalysts by activating calcination combined with acid leaching is carried out according to the following steps.

[0071] Raw material crushing: The honeycomb catalyst is directly crushed by a crusher to more than 100 mesh; the flat-plate catalyst is first crushed by a crusher, so that the active components of the catalyst are stripped from the steel mesh, and then the iron filings in the catalyst and the steel mesh are separated by two-stage magnetic separation technology .

[0072] Sodium roasting: Take the pulverized catalyst and mix it evenly with NaCl, the amount of NaCl is the mass of NaCl: Catalyst mass = 0.2, put it into a rotary kiln and roast at a high temperature at 800 °C for 4 h at a constant temperature. Under high temperature conditions, the metal oxides in the catalyst react with NaCl to form the corresponding sodium salts.

[0073] Acid leaching: Afte...

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Abstract

The invention discloses a method for recovering Ti, V, Mo and Si in a SCR (selective catalytic reduction) waste catalyst by combination of activation calcination and acid leaching. The method comprises the following steps: (1) performing pretreatment on the SCR waste catalyst; (2) performing high-temperature calcination for activation; (3) performing acid leaching to obtain white TiO2 powder; (4) performing evaporation and concentration on a leaching solution to obtain a white precipitate, namely H2MoO4; (5) adding NH3.H2O into the leaching solution to regulate pH to 8.0-9.0 to obtain a NH4VO3 precipitate; (6) adding ammonia water into the leaching solution to regulate the pH to 8.0-9.0, further adding MgCl2 to obtain MgSiO3 and enabling filtrate to enter a waste water recovery system. By the process disclosed by the invention, H2MoO4, NH4VO3, TiO2 and MgSiO3 are obtained by recovery. The method disclosed by the invention has the advantages of no discharge of harmful secondary pollutants, simple process, low recovery cost, very high economic and social benefits and feasibility of implementation.

Description

technical field [0001] The invention belongs to the technical fields of chemical technology and solid pollutant treatment, and in particular relates to a method for recovering Ti, V, Mo and Si in spent SCR catalysts by activating calcination combined with acid leaching. Background technique [0002] Nitrogen oxides (NO X ) emission control is one of the key tasks of my country's "Twelfth Five-Year Plan". Selective catalytic reduction (SCR) is currently the most widely used denitrification technology. The catalyst is the most critical component in the SCR system. However, the catalyst has a certain service life, generally 3 years. Therefore, my country is controlling NO X A large amount of SCR spent catalysts will be produced while discharging. Currently. There are two main disposal methods for spent catalysts: landfill and resource utilization. Because the catalyst contains heavy metals, my country has defined it as hazardous solid waste. Landfill not only has high c...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/12C22B34/22C22B34/34C01B33/22
CPCY02P10/20
Inventor 钟秦江晓明王虎于爱华丁杰董岳宋夫交赵小路赵炜
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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