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Method for synthesizing ordered mesopore nano-silica through pulverous coal

A nano-silica, fly ash technology, applied in the directions of silica, silica, chemical instruments and methods, etc., to achieve the effects of high mesoporous nanomaterial performance, shortening synthesis time, and reducing production costs

Inactive Publication Date: 2017-03-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this method has not been reported at home and abroad.

Method used

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  • Method for synthesizing ordered mesopore nano-silica through pulverous coal
  • Method for synthesizing ordered mesopore nano-silica through pulverous coal
  • Method for synthesizing ordered mesopore nano-silica through pulverous coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (A) Take by weighing 168g, 84g, 14g and 14g of grinding balls of 3mm, 5mm, 8mm and 10mm respectively, take by weighing 140g of fly ash, place the ball and fly ash in a 250mL corundum ball mill jar, adjust the speed of the ball mill to 200rpm, ball milling time is 30min; use a 200-mesh sieve to sieve the fly ash after ball milling to obtain fly ash with a particle size of less than 74 μm for use.

[0041] (B) Accurately weigh 2.5g of NaOH solid, 5g of sieved fly ash and 7.5mL of pure water, add them to the lining of a 100mL high-temperature and high-pressure reactor, and react at 100°C for 60min.

[0042] (C) The mixed product in the step (B) is separated with a suction filtration device, and an appropriate amount of CO is passed into the filtrate 2 Gas, adjust the pH value to 10.8-11.3, remove impurities such as iron and aluminum, and then separate with a suction filtration device to obtain a secondary filtrate that is purified sodium silicate solution.

[0043] (D) Ad...

Embodiment 2

[0047] (A) Take by weighing 168g, 84g, 14g and 14g of grinding balls of 3mm, 5mm, 8mm and 10mm respectively, take by weighing 140g of fly ash, place the ball and fly ash in a 250mL corundum ball mill jar, adjust the speed of the ball mill to 250rpm, ball milling time 20min; use a 200-mesh sieve to sieve the fly ash after ball milling to obtain fly ash with a particle size of less than 74 μm for use.

[0048] (B) Accurately weigh 2.5g of NaOH solids, 5g of sieved fly ash and 7.5mL of pure water, add them to the lining of a 100mL high-temperature and high-pressure reactor, and react at 110°C for 30min.

[0049] (C) The mixed product in the step (B) is separated with a suction filtration device, and an appropriate amount of CO is passed into the filtrate 2 Gas, adjust the pH value to 10.8-11.3, remove impurities such as iron and aluminum, and then separate with a suction filtration device to obtain a secondary filtrate that is purified sodium silicate solution.

[0050] (D) Adju...

Embodiment 3

[0054] (A) Take by weighing 168g, 84g, 14g and 14g of grinding balls of 3mm, 5mm, 8mm and 10mm respectively, take by weighing 140g of fly ash, place the ball and fly ash in a 250mL corundum ball mill jar, adjust the speed of the ball mill to 300rpm, ball milling time is 10min; use a 200-mesh sieve to sieve the fly ash after ball milling to obtain fly ash with a particle size of less than 74 μm for use.

[0055] (B) Accurately weigh 2.5g of NaOH solid, 5g of sieved fly ash and 7.5mL of pure water, add them to the lining of a 100mL high-temperature and high-pressure reactor, and react at 120°C for 15min.

[0056] (C) The mixed product in the step (B) is separated with a suction filtration device, and an appropriate amount of CO is passed into the filtrate 2 Gas, adjust the pH value to 10.8-11.3, remove impurities such as iron and aluminum, and then separate with a suction filtration device to obtain a secondary filtrate that is purified sodium silicate solution.

[0057] (D) Ad...

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Abstract

The invention provides a method for synthesizing ordered mesopore nano-silica through pulverous coal. The pulverous coal is broken and ground through a planetary ball mill; the screened pulverous coal and a sodium hydroxide solution are mixed and react at a high temperature under high pressure, and a purified sodium silicate solution is obtained after separation, pH regulation and re-separation; a surfactant and the purified sodium silicate solution are placed in a high-temperature reaction kettle with the temperature being 80 DEG C, CO2 gas with the volume fraction ranging from 15 vol% to 30 vol% is injected in the high-temperature reaction kettle under the magnetic stirring condition, and a sodium carbonate solution and orthosilicic acid sediments are obtained after the mixture reacts for 3 h and is then separated; and orthosilicic acid is dried for 2 h at the temperature being 105 DEG C, calcined for 4 h to 8 h at the temperature being 550 DEG C to 600 DEG C and cooled to obtain an ordered mesopore nano-silica product. By means of the method, the resource utilization of the pulverous coal is achieved, the high-value ordered mesopore nano-silica and sodium carbonate by-products are synthesized, and the method is a sustainable chemical reaction route; and meanwhile, by means of the technology, the production cost is substantially reduced, the production efficiency is substantially improved, the product has a regular hexagonal porous structure, the specific area is larger than 1000 m<2> / g, and the average pore size ranges from 2.5 nm to 3.5 nm.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid waste fly ash and synthesis of mesoporous materials, and in particular relates to a method for synthesizing ordered mesoporous nano silicon dioxide from fly ash. Background technique [0002] Fly ash is the fine ash collected from coal-fired flue gas by bag filter, and it is the main solid waste of coal-fired power plants in my country. my country's thermal power installed capacity has grown explosively since 2002 and its energy structure is dominated by coal. In 2015, the proportion of coal-fired power generation accounted for more than 90% of thermal power generation, and the annual growth rate was stable at more than 7%. Therefore, my country's coal-fired power generation The total amount of fly ash emitted by coal power plants has increased year by year, reaching 150 million tons in 2000, 302 million tons in 2005, 480 million tons in 2010, and 620 million tons i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18B82Y40/00C01D7/24C01D7/22
CPCC01B33/18B82Y40/00C01D7/22C01D7/24C01P2002/72C01P2004/04C01P2006/12C01P2006/16C01P2006/17
Inventor 蒋建国颜枫徐一雯李凯敏
Owner TSINGHUA UNIV
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