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Method for producing activated carbon and inorganic silicon compounds from rice hulls

A technology for producing activated carbon and rice husk charcoal, which is applied in the production of activated carbon and inorganic silicon compounds. It can solve the problems of complicated process equipment and complicated process steps, and achieve the effects of wide application range, high purity and less impurities in the product.

Inactive Publication Date: 2014-07-02
SUZHOU GREEN GENTECH ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process adopts three-step activation, activation and desiliconization are carried out at the same time, and a part of silicon dioxide is extracted in each step. The process is complex and has many equipment and complicated process steps.

Method used

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  • Method for producing activated carbon and inorganic silicon compounds from rice hulls

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Effect test

Embodiment 1）

[0020] (1) Feed the rice husk into a pyrolysis reactor such as our company's patent CN201010583412.4, and pyrolyze it at 480°C to generate rice husk charcoal;

[0021] (2) Crushing the rice husk charcoal into rice husk charcoal particles, crushing and screening out 60-100 mesh rice husk charcoal particles;

[0022] (3) React the above-mentioned rice husk charcoal particles with the desiliconizing agent sodium carbonate at 100°C for 4 hours in a reaction kettle, and then separate them in a filtration device to obtain a sodium silicate solution with a modulus of 2~2.5 and rice husk carbonized material;

[0023] (4) Mix the rice husk carbonized material with the activator zinc chloride evenly, activate in the activation equipment, the activation temperature is 650°C, and the activation time is 2 hours;

[0024] (5) After activation, all the substances in the activation equipment are washed in the washing tank for 1 hour, and the activator and wet activated carbon are obtained aft...

Embodiment 2）

[0028] (1) Feed the rice husk into a pyrolysis reactor such as our company's patent CN201010583412.4, and pyrolyze it at 550°C to generate rice husk charcoal;

[0029] (2) Crushing the rice husk charcoal into rice husk charcoal particles, crushing and screening out 60-100 mesh rice husk charcoal particles;

[0030] (3) React the above-mentioned rice husk charcoal particles with the desiliconization agent calcium hydroxide in a reaction kettle at 105°C for 4 hours, and then separate them in a filtration device to obtain a sodium silicate solution with a modulus of 2~2.5 and rice husk charcoal material ;

[0031] (4) Mix rice husk charcoal material and activator phosphoric acid evenly, activate in the activation equipment, the activation temperature is 700°C, and the activation time is 1.5h;

[0032] (5) After activation, all the substances in the activation equipment are washed in the washing tank for 1 hour, and the activator and wet activated carbon are obtained after separa...

Embodiment 3）

[0036] (1) Feed the rice husk into a pyrolysis reactor such as our company's patent CN201010583412.4, and pyrolyze it at 600°C to generate rice husk charcoal;

[0037] (2) Crushing the rice husk charcoal into rice husk charcoal particles, crushing and screening out 60-100 mesh rice husk charcoal particles;

[0038] (3) React the above-mentioned rice husk charcoal particles with desiliconizing agent ammonia water at 110°C for 3 hours in a reaction kettle, and then separate them in a filtration device to obtain a sodium silicate solution with a modulus of 2~2.5 and rice husk carbonized material;

[0039] (4) Mix rice husk carbonized material with activator water vapor evenly, and activate in the activation equipment, the activation temperature is 780°C, and the activation time is 1h;

[0040] (5) After activation, all the substances in the activation equipment are washed in the washing tank for 1 hour, and the activator and wet activated carbon are obtained after separation. The...

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Abstract

The invention relates to a reutilization and deep processing method of rice hulls for producing activated carbon, sodium silicate, silicon dioxide and other inorganic silicon compounds. The method comprises the following steps: carrying out pyrolytic carbonization on the rice hulls, desilicifying, activating, washing with water, drying and the like. By using the rice hulls as the raw material, the production technique is green and environment-friendly; the extracted silicon dioxide has the advantages of high purity and fewer impurities, and can reach nano level; and the modulus of the sodium silicate product subjected to secondary mold extraction can reach 3 above, and thus, the application range is wide. By performing the special activating technique on the raw material rice hulls, the activated carbon product has the advantages of fewer impurities and high activity, and the methylene blue adsorptive value can reach 25ml / 0.1g.All water and alkalis in the whole production technique can be recycled and reutilized, and all the energies consumed in the technical process are heat provided by rice hull pyrolysis, so the production cost is low. The technique is simple and easy to operate, implements high-added-value effective reutilization of the rice hulls, and has the advantages of energy saving and environment protection.

Description

technical field [0001] The invention relates to a method for producing activated carbon and inorganic silicon compounds by using rice husks as raw materials. Background technique [0002] Rice husk is the largest by-product of rice processing, accounting for about 20% of rice by weight. my country is the largest rice-producing country in the world, accounting for more than 1 / 3 of the world's total rice production. Based on my country's annual output of 2×108t rice, it can produce 1.4×108t of rice, 4000×104t of chaff, 2000×104t of rice bran and 2×108t of straw. How to rationally utilize these resources and increase the added value of rice production is a problem that needs to be considered in the future. [0003] For a long time, the comprehensive utilization of rice husk has been studied extensively at home and abroad, and many available ways have been obtained. Some people use rice husks to prepare silica, and some people use rice husks to make activated carbon or other ...

Claims

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Application Information

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IPC IPC(8): C01B31/08C01B33/12C01B32/324C01B32/336C01B32/342C01B32/348
Inventor 王兢李岳
Owner SUZHOU GREEN GENTECH ENERGY
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