Method for preparing charcoal through microwaves

A biochar and microwave technology, applied in chemical instruments and methods, water/sludge/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of high energy consumption, low efficiency and long heating time, and achieve the loss coefficient Large, speed up the reaction rate, save energy

Inactive Publication Date: 2016-07-20
TIANJIN CHENGJIAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems of long heating time, high energy consumption and low efficiency.

Method used

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  • Method for preparing charcoal through microwaves

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Effect test

Embodiment 1

[0020] A kind of method adopting microwave preparation biochar, adopts following steps:

[0021] 1) Mix 25% semi-dried sludge, 65% biological straw powder and 10% biochar powder, and then granulate to obtain shaped granules. The moisture content of the semi-dried sludge is 40%.

[0022] 2) placing the formed particles in a microwave oven for carbonization to obtain carbonized particles. The specific process is as follows: put the formed particles into a microwave oven, set the microwave power to 1200W, and set the carbonization time to 7 minutes. After passing nitrogen gas at a rate of 1 L / min for 15 minutes, start the microwave oven to start carbonization. After the carbonization is completed, carbonized particles are obtained. .

[0023] 3) Divide the carbonized particles into two unequal parts, and obtain the biochar powder described in step 1) after pulverization of a small part of the carbonized particles as a raw material and return to the step 1), and put most of the ...

Embodiment 2

[0028] A kind of method adopting microwave preparation biochar, adopts following steps:

[0029] 1) Mix 30% semi-dried sludge, 60% biological straw powder and 10% biochar powder, and then granulate to obtain shaped granules. The moisture content of the semi-dried sludge is 50%.

[0030] 2) placing the formed particles in a microwave oven for carbonization to obtain carbonized particles. The specific process is as follows: put the molded particles into a microwave oven, set the microwave power to 1800W, and set the carbonization time to 5 minutes. After passing nitrogen gas at a rate of 1L / min for 15 minutes, start the microwave oven to start carbonization. After the carbonization is completed, carbonized particles are obtained. .

[0031] 3) Divide the carbonized particles into two unequal parts, and obtain the biochar powder described in step 1) after pulverizing a small part of the carbonized particles as a raw material to return to the step 1), and put most of the carboni...

Embodiment 3

[0036] A kind of method adopting microwave preparation biochar, adopts following steps:

[0037] 1) Mix 30% semi-dried sludge, 55% biological straw powder and 15% biochar powder, and then granulate to obtain shaped granules. The moisture content of the semi-dried sludge is 45%.

[0038] 2) placing the formed particles in a microwave oven for carbonization to obtain carbonized particles. The specific process is as follows: put the shaped particles into a microwave oven, set the microwave power to 1400W, and the carbonization time to 6 minutes, and then feed nitrogen gas at a rate of 1L / min for 15 minutes, then start the microwave oven to start carbonization, and obtain carbonized particles after the carbonization is completed. .

[0039] 3) Divide the carbonized particles into two unequal parts, and obtain the biochar powder described in step 1) after pulverizing a small part of the carbonized particles as a raw material to return to the step 1), and put most of the carbonize...

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Abstract

The invention discloses a method for preparing charcoal through microwaves. The method comprises the following steps: I) mixing half-dried sludge, biological straw powder and charcoal powder, and pelletizing and molding so as to obtain molded granules; II) putting the molded granules in a microwave oven for carbonization so as to obtain carbonized granules; III) dividing the carbonized granules into two unequal parts, crushing a small part of the carbonized granules so as to obtain the charcoal powder serving as a raw material of the step I), and feeding back to the step I); soaking a large part of the carbonized granules into a 3-5mol/L KOH or NaOH solution for 12-18 hours, soaking in 5-6mol/L diluted hydrochloric acid for 0.5-2 hours, bleaching the material after acid pickling by using distilled water till the pH value is 6.5-7, and drying at 120 DEG C, so as to obtain charcoal of a porous structure. By adopting the method, the reaction velocity is accelerated, the reaction time is shortened, the energy consumption is reduced, and defects of a conventional pyrolysis method and a microwave wet method can be overcome.

Description

technical field [0001] The invention relates to a method for preparing biochar, in particular to a method for preparing biochar by using microwaves. Background technique [0002] Heavy metals in wastewater cannot be decomposed, have strong physiological toxicity and bioaccumulation, and react with other substances in water to generate more toxic pollutants. Biochar is the solid product of biomass pyrolysis under anoxic conditions. The biochar prepared by pressing sludge into granules with straw as a binder and thermally cracking has a large specific surface area and microporous structure, which can adsorb heavy metals in wastewater. [0003] Patent document CN104289177A disclosed a method for preparing biochar for heavy metal wastewater purification on January 21, 2015. The method adopts the traditional pyrolysis method to carbonize the mixture of straw and sludge to prepare biochar, which can not only solve the environmental pollution of sludge problems, and at the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
CPCB01J20/20B01J20/3078C02F1/281C02F1/283
Inventor 魏国侠刘汉桥臧丹丹高思雨徐仙杨伟李野
Owner TIANJIN CHENGJIAN UNIV
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