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Method for preparing nano-silicon dioxide by utilizing rice hull ash

A nano-silica, rice husk ash technology, applied in the directions of silica, silica, chemical instruments and methods, can solve problems such as environmental pollution, and achieve shortened reaction time, simple equipment manufacturing process, and small particle size. Effect

Active Publication Date: 2016-11-16
WEST ANHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of equipment can achieve full combustion, uniformity, high efficiency, and precise temperature control, it will produce a large amount of carbon dioxide gas when the rice husk is burned, causing pollution to the environment.

Method used

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  • Method for preparing nano-silicon dioxide by utilizing rice hull ash
  • Method for preparing nano-silicon dioxide by utilizing rice hull ash
  • Method for preparing nano-silicon dioxide by utilizing rice hull ash

Examples

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Effect test

Embodiment 1

[0044] A kind of method utilizing rice husk ash to prepare nano silicon dioxide, concrete method steps are as follows:

[0045] (1) Preparation of sodium silicate:

[0046] Mix rice husk ash and alkali solution evenly according to the mass ratio of 1:20, put them in a digester, heat up the digester to 85-℃, stop heating after 1.5 hours of reaction, cool to room temperature, and transfer to the mortar tank , and then filter and precipitate through a filter press to obtain a sodium silicate solution, and the Baume degree of the sodium silicate solution is 45 degrees;

[0047] (2) Preparation of nano silicon dioxide:

[0048] The sodium silicate solution described in step (1) is warmed up to 70° C., pumped into the spray gun of the spray drying tower, and simultaneously fed into CO and air mixed gas, the CO 2 The pressure of mixed gas with air: 1.8MPa, temperature: 80°C, flow rate: 1L / min, the mass volume ratio of the sodium silicate solution to the mixed gas is 1g:2L; the reac...

Embodiment 2

[0057] A kind of method utilizing rice husk ash to prepare nano silicon dioxide, concrete method steps are as follows:

[0058] (1) Preparation of sodium silicate:

[0059] Mix rice husk ash and alkali solution evenly according to the mass ratio of 1:30, place in a digester, heat up the digester to 120°C, stop heating after reacting for 5 hours, cool to room temperature, transfer to the mortar tank, Then filter and precipitate through a filter press to obtain a sodium silicate solution, and the Baume degree of the sodium silicate solution is 45 degrees;

[0060] (2) Preparation of nano silicon dioxide:

[0061] The sodium silicate solution described in step (1) is warmed up to 90°C, pumped into the spray gun of the spray drying tower, and simultaneously fed into CO2 and air mixed gas, the CO 2 The pressure of mixed gas with air: 3.0MPa, temperature: 100°C, flow rate: 15L / min, the mass volume ratio of the sodium silicate solution to the mixed gas is 1g:8L; the reacted slurry ...

Embodiment 3

[0070] A kind of method utilizing rice husk ash to prepare nano silicon dioxide, concrete method steps are as follows:

[0071] (1) Preparation of sodium silicate:

[0072] Mix the rice husk ash and alkali solution evenly according to the mass ratio of 1:18, put them in a digester, heat up the digester to 110°C, stop heating after reacting for 3.5 hours, cool to room temperature, and transfer to the mortar tank. Then filter and precipitate through a filter press to obtain a sodium silicate solution, and the Baume degree of the sodium silicate solution is 45 degrees;

[0073] (2) Preparation of nano silicon dioxide:

[0074] The sodium silicate solution described in step (1) is warmed up to 85° C., pumped into the spray gun of the spray drying tower, and simultaneously fed into CO and air mixed gas, the CO 2 The pressure of mixed gas with air: 2.5MPa, temperature: 95°C, flow rate: 12L / min, the mass volume ratio of the sodium silicate solution to the mixed gas is 1g: 6.5L; the...

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Abstract

The invention relates to the technical field of silicon dioxide production, and particularly relates to a method for preparing nano-silicon dioxide by utilizing rice hull ash. The method comprises the following steps: (1) preparing sodium silicate; (2) preparing nano-silicon dioxide, namely heating the sodium silicate solution in the step (1) to 70-90 DEG C, pumping into a spray gun of a drying tower, introducing CO2 and air mixed gas at a pressure of 1.8-3.0MPa, a temperature of 80-100 DEG C and a flowing speed of 1-15L / min, and keeping the mass-volume rate of the sodium silicate solution to the mixed gas is 1g:(2-8)L; collecting the reacting slurry to the bottom of a reaction tower, settling the slurry in a settling tank, collecting supernatant liquid, washing and precipitating until the pH is neutral, and drying the precipitate by spray to obtain nano-silicon dioxide. The method has a yield of 85-95 percent, and is simple in equipment manufacture process, low in cost, easy to industrialize and convenient to maintain.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide production, in particular to a method for preparing nanometer silicon dioxide by using rice husk ash. Background technique [0002] According to the production method, white carbon black is roughly divided into precipitated white carbon black and fumed white carbon black. Precipitated silica is further divided into traditional precipitated silica and special precipitated silica, the former refers to sulfuric acid, hydrochloric acid, CO 2 Silica produced with water glass as the basic raw material, the latter refers to the silica produced by special methods such as high gravity technology, sol-gel method, chemical crystal method, secondary crystallization method or reverse micellar microemulsion method silicon. Most domestic production enterprises adopt the precipitation method, but the precipitation method does not actually reach the nanometer level, and its performance is far behind the ...

Claims

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Application Information

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IPC IPC(8): C01B33/12
CPCC01B33/126C01P2002/72C01P2004/04C01P2004/61C01P2004/62C01P2006/12C01P2006/14C01P2006/19C01P2006/80
Inventor 吴菊陈乃富陈存武金俊成
Owner WEST ANHUI UNIV
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