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
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[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 ...
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[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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