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Recovery method for potassium catalyst in coal catalytic gasification ash

A coal catalytic gasification and recovery method technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of high energy consumption and low concentration of potassium recovery solution , low recovery rate of total potassium and other problems, to achieve the effect of reducing concentration energy consumption, overcoming large water consumption, and reducing water consumption

Active Publication Date: 2015-08-05
ENN SCI & TECH DEV
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Problems solved by technology

[0004] As can be seen from the above: the recovery process in the prior art consumes a lot of water, and the concentration of the potassium recovery solution is low, so that the evaporation and concentration process consumes a lot of energy, and the total potassium recovery rate is low, which makes the recovery of the potassium catalyst become the biggest problem.

Method used

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  • Recovery method for potassium catalyst in coal catalytic gasification ash
  • Recovery method for potassium catalyst in coal catalytic gasification ash
  • Recovery method for potassium catalyst in coal catalytic gasification ash

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specific Embodiment approach

[0071] In the following, the embodiments of the present invention illustrate the technical effects of the present invention through comparative examples and examples respectively. These examples are merely examples for specifically illustrating the present invention, and those skilled in the art will understand that the scope of the present invention is not limited by these examples, comparative examples, and test examples.

Embodiment 1

[0077] see figure 2 , the water washing section of Example 1 includes a first-stage water washing process, and the digestion section includes a fourth-stage digestion reaction.

[0078] Specifically, the washing process of the washing section A is as follows: the coal catalytic gasification ash 1 enters the washing section A for washing, the washing temperature is 80°C, and the washing is stirred and washed for 1 hour, wherein the washing liquid 6 in the washing section A is The digestion potassium solution 4 from the digestion section B, the water washing solution 6 washes the coal catalytic gasification ash 1 and then outputs the potassium solution 7 and the washing slag 3, and the washing slag 3 enters the last stage of digestion reaction d The reactor is used as the raw material for the final digestion reaction d.

[0079] The digestion reaction of the specific digestion section B is: add digestion solution 2 in the reactor of the first-level digestion reaction a, and th...

Embodiment 2

[0082] see Figure 5 , the water washing section of Example 2 includes a 4-stage water washing process, and the digestion section includes a 1-stage digestion reaction.

[0083] Specifically, the washing process of the washing section A is as follows: the washing temperature of each washing process reactor in the washing section is 60°C, the washing time is 2h, and the coal catalytic gasification ash 1 enters the final washing process d' The reactor is washed with the water washing solution 6 in the reactor from the previous water washing process c', and the reactor in the last water washing process d' outputs the potassium solution 7, and the water washing slag 3 enters the The reactor of the upper-level water washing process c' is washed with the washing liquid 6 from the reactor of the adjacent upper-level water washing process b' to obtain the water-washing slag 3 and then enter the upper-level water washing process b ', and so on, after four stages of water washing proce...

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Abstract

The invention relates to the field of coal catalytic gasification, particularly to a method for recovery of potassium catalyst in coal catalytic gasification ash. While reducing water consumption and lowering energy consumption, the method can enhance the total recovery rate of potassium in ash, and overcomes the defects of large water consumption, low concentration of potassium recovered solution, high energy consumption of the evaporation and concentration process in the recovery technology of the prior. The recovery method provided by the embodiment of the invention includes: a washing section, and a digestion section containing at least two-stage digestion reaction. In the washing section, coal catalytic gasification ash is subjected to washing, and the obtained washing slag enters the reactor of the last stage digestion reaction to serve as the raw material of the last stage digestion reaction. In the digestion section, the potassium solution generated by a former stage digestion reaction enters the reactor of a next stage digestion reaction, the solid product enters the reactor of the former stage digestion reaction to serves as the raw material of the former stage digestion reaction, and the potassium solution in the reactor of the last stage digestion reaction enters the washing section.

Description

technical field [0001] The invention relates to the field of coal catalytic gasification, in particular to a method for recovering potassium catalyst in coal catalytic gasification ash. Background technique [0002] Coal catalytic gasification refers to the process of gasification reaction between coal and gasification agent in the presence of catalyst. Among various catalysts, potassium catalyst has good catalytic activity and is the most common catalyst in coal catalytic gasification reaction. However, due to the characteristics of high price and strong corrosion of potassium catalyst, in order to reduce the Corrosion of equipment requires its recycling. [0003] Potassium catalysts in coal catalytic gasification ash mainly exist in two ways: water-soluble potassium salt form and insoluble potassium aluminosilicate form. The water-soluble potassium salt and insoluble potassium aluminosilicate are recovered in the process and the digestion process respectively. Among them...

Claims

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Application Information

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IPC IPC(8): B01J23/92B01J38/48
Inventor 王会芳金亚丹李克忠
Owner ENN SCI & TECH DEV
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