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Method and system for recovery of insoluble alkali metal catalyst from catalytic gasification ash

A recovery method and technology for a recovery system are applied in the field of recovery of insoluble alkali metal catalysts in catalytic gasification ash and slag, and can solve the problems of complex operation, small exchange rate, harsh reaction conditions, etc.

Active Publication Date: 2016-12-21
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the recovery process of insoluble alkali metal catalysts is usually: adding a large amount of digestion agents, such as calcium oxide, calcium hydroxide, etc., to the ash containing insoluble potassium metal catalysts, and ion exchange occurs under high temperature and pressure Reaction makes potassium ions exist in the form of soluble potassium salt, and it is recovered. However, due to the poor solubility of the digester in water, the exchange rate of ion exchange with the insoluble potassium metal catalyst is small. In practical applications, in order to increase The solubility of the digestion agent requires relatively harsh reaction conditions, complex operation, high economic cost and low recovery efficiency.

Method used

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  • Method and system for recovery of insoluble alkali metal catalyst from catalytic gasification ash
  • Method and system for recovery of insoluble alkali metal catalyst from catalytic gasification ash
  • Method and system for recovery of insoluble alkali metal catalyst from catalytic gasification ash

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Obtain insoluble alkali metal ash:

[0078] The coal catalytic gasification ash is washed with water, and the solid-liquid separation is carried out to obtain the insoluble alkali metal ash and the water washing solution.

[0079] Catalyst recovery from insoluble alkali metal ash:

[0080] 001) Detect the potassium ion content in the insoluble alkali metal ash, weigh a certain amount of digestion agent (calcium hydroxide), make the molar ratio of calcium ion and potassium ion be 2, add in the calcium hydroxide 1.5% polymer dispersant, and its mixture is ground in a wet mill until the particle size is less than or equal to 350 mesh.

[0081] 002) inject the digestion agent powder obtained in step 001) into the spray gun, and utilize the high-pressure airflow produced by the nitrogen compressor to entrain the digestion agent powder with water vapor (the mass ratio of the water vapor to the insoluble alkali metal ash slag The mixture of 2) flows through the plasma chargi...

Embodiment 2

[0085] Described embodiment 2) the insoluble alkali metal ash that adopts is identical with embodiment 1);

[0086] Catalyst recovery from insoluble alkali metal ash:

[0087] 001) Detect the potassium ion content in the insoluble alkali metal ash, weigh a certain amount of digestion agent (calcium hydroxide), make the molar ratio of calcium ion and potassium ion be 0.6, add in the calcium hydroxide 0.5% polymer dispersant, and grind the mixture in a wet mill until the particle size is less than or equal to 350 mesh.

[0088] 002) inject the digestion agent powder obtained in step 001) into the spray gun, and utilize the high-pressure airflow produced by the nitrogen compressor to entrain the digestion agent powder with water vapor (the mass ratio of the water vapor to the insoluble alkali metal ash slag The mixture of 3.9) flows through the plasma charging unit in the plasma generator at high speed, and the temperature of the plasma is controlled to be 180°C.

[0089] 003) ...

Embodiment 3

[0092] Described embodiment 3) the insoluble alkali metal ash that adopts is identical with embodiment 1);

[0093] Catalyst recovery from insoluble alkali metal ash:

[0094] 001) Detect the potassium ion content in the insoluble alkali metal ash, take a certain amount of digestion agent (calcium hydroxide), make the molar ratio of calcium ion and potassium ion be 1.95, add in the calcium hydroxide 1% polymer dispersant, and grind the mixture in a wet mill until the particle size is less than or equal to 350 mesh.

[0095]002) Inject the digestion agent powder obtained in step 001) into the spray gun, and utilize the high-pressure air flow produced by the air compressor to entrain the digestion agent powder with water vapor (the mass ratio of the water vapor to the insoluble alkali metal ash slag The mixture of 0.5) flows through the plasma charging unit in the plasma generator at a high speed, and the temperature of the plasma is controlled to be 160°C.

[0096] 003) The m...

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Abstract

The invention relates to the technical field of catalyst recovery, particularly to a method and system for recovery of an insoluble alkali metal catalyst from catalytic gasification ash. The method has the advantages of simple process and low cost, also can improve the recovery efficiency of the insoluble alkali metal catalyst, and overcomes the defects of harsh process conditions, high cost and low recovery efficiency of insoluble alkali metal catalyst due to poor solubility of a digestion agent in water in the prior art. The method for recovery of the insoluble alkali metal catalyst from catalytic gasification ash consists of: step 1) performing washing treatment on the catalytic gasification ash and conducting solid-liquid separation to obtain insoluble alkali metal ash; step 2) carrying out plasma treatment on a digestion agent to obtain an activated digestion agent; and step 3) mixing the activated digestion agent with insoluble alkali metal ash in the presence of plasma water vapor to carry out digestion reaction and solid-liquid separation.

Description

technical field [0001] The invention relates to the technical field of catalyst recovery, in particular to a recovery method and system for an insoluble alkali metal catalyst in catalytic gasification ash. Background technique [0002] In the catalytic gasification process, since the addition of the catalyst can effectively reduce the reaction temperature, increase the reaction rate, and increase the methane yield, in the existing coal catalytic gasification process, the catalytic activity of potassium carbonate is the best, but its cost Higher, it is necessary to recover the catalyst in the ash generated by the catalytic coal gasification reaction to reduce the cost. [0003] In the existing coal catalytic gasification process, the existence form of the catalyst is related to the coal quality (ash content, ash content), gasification process (temperature, atmosphere, residence time), ash carbon conversion rate, etc. The content of Al and Si in the ash is high, the gasificat...

Claims

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Application Information

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IPC IPC(8): B01J23/92B01J38/48B01J38/64B01J38/74
CPCB01J23/92B01J38/48B01J38/64B01J38/74
Inventor 毛燕东刘雷李克忠
Owner ENN SCI & TECH DEV
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