Method for producing porous nano silica and active carbon by utilizing rice hull ash

A technology of nano-silica and rice husk ash, which is applied in the field of comprehensive utilization of biological waste resources, can solve problems such as low quality, decreased yield, serious problems, etc., and achieve the effects of increased reaction area, increased reaction speed, and good extinction performance

Inactive Publication Date: 2010-12-22
CHANGSHA DESIGN & RES INST OF CHEM IND MIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this route still has obvious deficiencies: that is, in the process of preparing silicon dioxide, the traditional precipitation method is used to produce white carbon black, which needs to consume a large amount of caustic soda and acid, which not only causes high cost, but also causes Larger environmental pollution, no industrial development value
However, after careful study, it is not difficult to find that on the one hand, this method does not actually achieve the effect of reducing emissions: because the lye needs to be recycled, when a large amount of carbon dioxide is introduced into the solution, the bicarbonate reaches saturation, and in the second cycle , either the bicarbonate is directly decomposed at high temperature, an

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  • Method for producing porous nano silica and active carbon by utilizing rice hull ash
  • Method for producing porous nano silica and active carbon by utilizing rice hull ash

Examples

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Example Embodiment

[0030] Example 1

[0031] (1) Take 10Kg of rice husk ash, and wash the rice husk ash with water at a ratio of 1:1.5 by volume of rice husk ash to water to remove the incompletely burned rice husk on the upper layer and the sediment deposited on the bottom at 110°C Dry until the water content is less than 1%, crush, and pass through a 100-mesh sieve to remove large particles;

[0032] (2) Soak in sulfuric acid solution with pH 3 at 60°C for 4 hours. The volume ratio of sulfuric acid solution to rice husk ash is 1:1.5. Stir continuously during the soaking process. After soaking, filter directly to separate the filter residue and acid. ; Acid recycling;

[0033] (3) Add the filter residue obtained in step (2) to the potassium carbonate solution with a mass concentration of 15%, and the volume ratio of the filter residue to the potassium carbonate solution is 1:1.2, stir and react at 98°C for 3 hours, and filter while maintaining the system temperature ;

[0034] (4) Place the filtrate ...

Example Embodiment

[0046] Example 2

[0047] (1) Take 10Kg rice husk ash, and wash the rice husk ash 3 times according to the ratio of rice husk ash to water volume ratio of 1:2 to remove the incompletely burned rice husk on the upper layer and the sediment deposited on the bottom, 110°C Dry it until the water content is less than 1%, crush it, and pass through a 60-mesh sieve to remove large particles;

[0048] (2) Soak in a hydrochloric acid solution with a pH of 4 at 40°C for 2 hours. The volume ratio of the hydrochloric acid solution to the rice husk ash is 1:1.2. Stir continuously during the soaking process. After the soaking is completed, filter residue and acid are directly separated by filtration. Acid recycling;

[0049] (3) Add the filter residue obtained in step (2) to the sodium carbonate solution with a mass concentration of 15%, and the volume ratio of the filter residue to the sodium carbonate solution is 1:1.5, stir and react at 95°C for 4 hours, and filter while maintaining the system...

Example Embodiment

[0062] Example 3

[0063] (1) Take 10Kg of rice husk ash for power generation, and wash the rice husk ash for 3 times according to the volume ratio of rice husk ash to water of 1:1.3 to remove the incompletely burned rice husk on the upper layer and the sediment deposited on the bottom. Dry it at 80℃ until the water content is less than 1%, crush it, and remove large particles through a 40-mesh sieve;

[0064] (2) Soak in a nitric acid solution with a pH of 4 at 55°C for 3 hours. The acid solution: rice husk ash volume ratio is 1:1.4. Stir constantly during the soaking process. After soaking, filter residue and acid solution are directly separated by filtration. Acid recycling;

[0065] (3) Add the filter residue obtained in step (2) to a sodium carbonate solution with a mass concentration of 15%, with a volume ratio of 1:1.3, stir and react at 100°C for 4 hours, and filter while maintaining the system temperature;

[0066] (4) Put the filtrate of step (3) in the precipitation tank, ...

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Abstract

The invention discloses a method for producing porous nano silica and active carbon by utilizing rice hull ash, which comprises the following steps of: at lower temperature and normal pressure, performing secondary alkali dissolution on subcarbonate, and filtering to obtain alkali-dissolved filter liquor and filter residue; adding a certain amount of dispersing agent into the filter liquor, reducing temperature for ageing, filtering, washing, and removing the dispersing agent to obtain the porous nano silica; and adding an activating agent into the alkali-dissolved filter residue, activating, washing and drying to obtain the high specific surface area active carbon. The alkali and the active carbon can be recycled, and only a small amount of alkali and active carbon is lost. The method has the advantages of not seriously corroding equipment due to no high-temperature and high-pressure alkali boiling, sufficient raw materials, low price, no environmental pollution, and higher quality of the obtained active carbon and silica.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of biological waste resources, in particular to a method for producing porous nano silicon dioxide and activated carbon by using remaining rice husk ash after power generation as raw materials. Background technique [0002] Rice is the crop with the most extensive planting area and the largest yield in the world. At present, the total output of rice in the world is nearly 600 million tons, while the total output of my country is about 200 million tons. Rice husk accounts for about 20% of rice. Although my country's rice husk resources are very rich, the current utilization rate is very low. In rural areas, rice husk is used as livestock feed, but due to its low nutrient content, and the surface of rice husk is densely covered with lignin, which tightly surrounds crude fiber, the total digestibility of livestock intake can only reach 5 %-8%. Therefore, most of the rice husks are discard...

Claims

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Application Information

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IPC IPC(8): C01B33/12C01B31/12B09B3/00
Inventor 孙成高夏适汤建良刘星强李靖波
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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