Method for recovering waste SCR (Selective Catalytic Reduction) denitration catalyst

A technology of SCR catalyst and denitration catalyst is applied in the field of recycling and processing waste SCR denitration catalyst, which can solve the problems such as inability to achieve efficient separation and acquisition, inability to realize recycling and remanufacturing of waste SCR denitration catalyst, and lack of mature waste catalyst recycling and processing technology.

Active Publication Date: 2015-07-29
BOTREE CYCLING SCI &TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] None of the above-mentioned existing SCR denitrification catalyst recovery and treatment technologies can realize the recycling and remanufacture of spent SCR denitrification catalysts, and at the same time cannot realize the efficient separation of valuable elements such as V, W, Mo and Ti, and

Method used

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  • Method for recovering waste SCR (Selective Catalytic Reduction) denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Waste vanadium molybdenum series SCR denitrification catalyst provided by a laboratory, V 2 o 5 The content is 1.1%, MoO 3 3.3%, TiO 2 95.3%.

[0049] (1) Take 10g of the above spent catalyst, pulverize it to 100 mesh, wash it with water, filter it, and dry it at 105°C. NaOH is added to the dried spent catalyst as an additive, and the molar ratio of NaOH to the total amount of metal in the spent catalyst is m add :m metal =1. After mixing evenly, put it in a muffle furnace for roasting, the roasting temperature is 650°C, and the roasting time is 4h;

[0050] (2) Using neutral pure water as the leaching agent, leaching V and Mo from the spent catalyst after roasting in step (1), the liquid-solid ratio is 0.02L / g, the leaching temperature is 20°C, and the leaching pressure is 0.1MPa. The time is 1.5h, the stirring speed is 1000r / min, the V single-stage leaching rate is 78.6%, Mo is 75.7%; the leaching residue returns to step (1);

[0051] (3) The extraction system...

Embodiment 2

[0056] Waste vanadium molybdenum series SCR denitrification catalyst provided by a laboratory, V 2 o 5 The content is 1.4%, MoO 3 3.2%, TiO 2 95%.

[0057] (1) Take 5g of the above spent catalyst, pulverize it to 100 mesh, wash it with water, filter it, and dry it at 105°C. NaOH is added to the dried spent catalyst as an additive, and the molar ratio of NaOH to the total amount of metal in the spent catalyst is m add :m metal =2. After mixing evenly, place it in a muffle furnace for roasting, the roasting temperature is 680°C, and the roasting time is 5h;

[0058] (2) Using neutral pure water as the leaching agent, leaching V and Mo from the spent catalyst after roasting in step (1), the liquid-solid ratio is 0.06L / g, the leaching temperature is 60°C, and the leaching pressure is 0.1MPa. The time is 2 hours, the stirring speed is 800r / min, the V single-stage leaching rate is 79.6%, Mo is 77.4%; the leaching residue returns to step (1);

[0059] (3) The extraction syste...

Embodiment 3

[0064] The waste vanadium tungsten based SCR denitrification catalyst provided by a laboratory, V 2 o 5 The content is 1.5%, WO 3 3.3%, TiO 2 95%.

[0065] (1) Take 10g of the above spent catalyst, pulverize it to 100 mesh, wash it with water, filter it, and dry it at 105°C. Add Na to the dried spent catalyst 2 CO 3 As an additive, Na 2 CO 3 The molar ratio m to the total amount of metal in the spent catalyst add :m metal =6. After mixing evenly, place it in a muffle furnace for roasting, the roasting temperature is 500°C, and the roasting time is 7 hours;

[0066] (2) Use neutral pure water as the leaching agent, leaching V and W from the spent catalyst after roasting in step (1), the liquid-solid ratio is 0.05L / g, the leaching temperature is 70°C, and the leaching pressure is 0.1MPa. The time is 1.5h, the stirring speed is 1200r / min, the V single-stage leaching rate is 79.6%, and the W is 76.4%; the leaching residue returns to step (1);

[0067] (3) The extractio...

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Abstract

The invention relates to a method for recovering a waste SCR (Selective Catalytic Reduction) denitration catalyst. According to the method, the waste SCR denitration catalyst is subjected to pretreatment firstly so as to remove impurities and catalysis ingredients, such as activated vanadium, tungsten and molybdenum, and then, the waste SCR denitration catalyst is subjected to leaching, so as to obtain titanium-rich leached residue and a tungsten-molybdenum-vanadium-containing leachate; valuable elements in the leachate can be subjected to resource treatment through two methods: the first method comprises the steps of synchronously purifying the valuable elements in the leachate, then, proportionally adjusting the content of each substance so as to prepare a mixture of the catalysis ingredients, and further preparing a new catalyst so as to realize remanufacturing; the second method comprises the steps of separating and purifying each valuable element in the leachate, thereby preparing different products. The method can be used for recovering the valuable elements in the waste SCR denitration catalyst, and the environmental and economic benefits are remarkable.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, in particular to a recovery and treatment method of a waste SCR denitration catalyst. Background technique [0002] my country is a country that consumes a lot of coal resources. While the combustion of coal brings convenience to residents' lives, it also produces a large amount of nitrogen oxides (NO x ) and sulfur oxides (SO 2 ). These nitrogen oxides and sulfur oxides are the main components of air pollution. On the one hand, they seriously pollute the air environment, and on the other hand, they also form acid rain, which brings huge hidden dangers to natural water resources. Selective Catalytic Reduction (SCR) is a relatively reliable and simple denitrification technology that has emerged in recent years. It usually uses ammonia as a denitrification agent to catalytically reduce nitrogen oxides under the action of an SCR catalyst. Nitrogen is non-polluting. SCR catalysts mainly inclu...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22C22B34/34C22B34/36B01D53/96
CPCB01D53/96C22B7/00C22B34/22C22B34/34C22B34/36Y02P10/20Y02P20/584
Inventor 林晓刘晨明李志强潘尹银
Owner BOTREE CYCLING SCI &TECH CO LTD
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