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 evapo

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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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[0071] Hereinafter, the embodiments of the present invention illustrate the technical effects of the present invention through comparative examples and examples, respectively. These examples are only examples provided to specifically illustrate the present invention, and those skilled in the art will know that the scope of the present invention is not limited by these examples, comparative examples and test examples.

Example Embodiment

[0076] Example 1

[0077] see figure 2 , the washing section of the embodiment 1 includes a 1-stage water washing process, and the digestion section includes a 4-stage digestion reaction.

[0078] The specific 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 for 1 hour, wherein the washing liquid 6 in the washing section A is: From the digestion potassium solution 4 of digestion section B, the washing liquid 6 outputs potassium solution 7 and washing slag 3 after the washing of the coal catalytic gasification ash 1, and the washing slag 3 enters the final stage of digestion reaction d. The reactor is used as the raw material for the final digestion reaction d.

[0079] The specific digestion reaction of digestion section B is: adding digestion solution 2 into the reactor of the first-stage digestion reaction a, and the water-slag...

Example Embodiment

[0081] Example 2

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

[0083] The specific washing process of the washing section A is as follows: in the washing section, the washing temperature of each washing process reactor is 60°C, the washing time is 2 h, and the coal catalytic gasification ash 1 enters the last level washing process d' the reactor, carry out the washing process with the washing liquid 6 in the reactor from the previous washing process c', the reactor output potassium solution 7 in the last stage washing process d', obtain washing residue 3 and enter the The reactor of the upper-stage washing process c' is subjected to the washing process with the washing liquid 6 from the reactor of the adjacent upper-stage washing process b', and the washing residue 3 is obtained and then enters the upper-stage washing process b. ' reactor, and s...

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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...

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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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