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Method for preparing super active carbon by taking biomass power plant ash as raw material

A technology of biomass power plant ash and activated carbon, which is applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of insufficient utilization of active ingredients and pollution of the environment, and achieve the effect of optimizing resource utilization

Active Publication Date: 2014-05-07
ZHONGYING CHANGJIANG INTERNATIONAL NEW ENERGY INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The raw materials for traditional activated carbon preparation mainly use coal-based, petroleum coke-based and coconut shell, etc. Biomass power plant ash is a kind of industrial waste. If it is discarded directly, the active ingredients in it cannot be fully utilized, and it will pollute the environment.

Method used

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  • Method for preparing super active carbon by taking biomass power plant ash as raw material

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Effect test

Embodiment 1

[0038] A method for preparing super activated carbon with biomass power plant ash as raw material, comprising the following steps:

[0039] 1) Add biomass power plant ash with a particle size of 20-50 μm into a NaOH solution with a mass percentage of 25-35%, and soak for 1.5-2.5 hours at a temperature of 85-90°C to make it fully react, filter and separate Obtain sodium silicate solution and primary insoluble matter; The obtained sodium silicate solution enters the operation of producing white carbon black to obtain white carbon black, wherein, the mass percent of each component in the biomass power plant ash is: SiO 2 : 55~75%; CaO: 8~15%; K 2 O: 3~9%; carbon residue: 4~8%; the balance is Fe 2 o 3 , MgO, P 2 o 5 and unavoidable impurities;

[0040] 2) Wash the primary insoluble matter obtained in step 1) in water for 2 to 3 times, then place it in hydrochloric acid solution, under the condition of controlling the pH to 1 to 3, carry out airtight stirring for 4 to 7 hours,...

Embodiment 2

[0046] A method for preparing super activated carbon with biomass power plant ash as raw material, comprising the following steps:

[0047] Prepare charcoal residue with embodiment 1 method, difference is:

[0048] 1) Place the obtained carbon residue in water vapor and CO at a temperature of 800°C 2 Activated in a mixed gas environment to obtain an intermediate product of activated carbon, wherein water vapor and CO in the mixed gas 2 The volume ratio is 2:1, the flow rate of the mixed gas is 100ml / min, and the activation time is 2h;

[0049] 2) Mix the activated carbon intermediate product obtained in step 2) with NaOH, and activate it for 2 hours after heating up from room temperature to 800 °C at a heating rate of 4 °C / min in a nitrogen environment; the activated carbon intermediate product is obtained with The weight ratio of NaOH is 1:4,

[0050] 3) Wash the activated product obtained in step 5) with water for 2 times, then wash with 20% hydrochloric acid for 1 to 4 t...

Embodiment 3

[0053] A method for preparing super activated carbon with biomass power plant ash as raw material, comprising the following steps:

[0054] Prepare charcoal residue with embodiment 1 method,

[0055] 1) Put the obtained carbon residue in water vapor and CO at a temperature of 600°C 2 Activated in a mixed gas environment to obtain an intermediate product of activated carbon, wherein water vapor and CO in the mixed gas 2 The volume ratio is 3:1, the flow rate of the mixed gas is 400ml / min, and the activation time is 2h;

[0056] 2) Mix the activated carbon intermediate product obtained in step 2) with NaOH, and activate it for 1 hour after heating from room temperature to 900 °C at a heating rate of 5 °C / min in a nitrogen environment; the activated carbon intermediate product is obtained with The weight ratio of NaOH is 1:5,

[0057] 3) Wash the activated product obtained in step 5) with water for 2 times, then wash with 22% hydrochloric acid for 1 to 4 times, then wash with ...

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Abstract

The invention discloses a method for preparing super active carbon by taking biomass power plant ash as a raw material. A particular preparation process is as follows: the biomass power plant ash is boiled by alkali and then is filtered to filter insoluble substances; a hydrochloric acid solution is added into the insoluble substances; impurity removal and water washing are carried out to obtain an active carbon precursor, namely residual carbon; the residual carbon is heated and activated in the atmosphere of water steam and CO2 to obtain a middle product; then the middle product and NaOH are mixed to be heated and activated in the atmosphere of N2; an activated product is washed and dried to obtain the super active carbon. The method takes wastes of a biomass power plant as raw materials and utilizes the NaOH with a low price to replace KOH with the high price, so that the wastes are changed into valuable things to obtain the active carbon with a high additional value for a super capacitor.

Description

technical field [0001] The invention relates to activated carbon preparation technology, in particular to a method for preparing super activated carbon by using biomass power plant ash as raw material. Background technique [0002] Activated carbon is widely used in water treatment, air purification, flue gas desulfurization and denitrification, and catalyst carrier due to its large specific surface area, abundant pores and stable chemical properties. In recent years, due to the needs of high-tech fields, high-performance activated carbon has also been increasingly developed and applied to high-demand fields such as blood purification, automobile canisters, supercapacitor electrode materials, lithium-ion battery anode materials, and military and aerospace. Although the output of activated carbon in my country is large, most of them are low-end products. High-performance activated carbon still needs to be imported in large quantities. Therefore, the preparation of high-perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
CPCC01B32/342
Inventor 陈义龙张岩丰周欢欢陶磊明郑兴才
Owner ZHONGYING CHANGJIANG INTERNATIONAL NEW ENERGY INVESTMENT CO LTD
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