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Sodalite synthesis method by adopting bentonite through one-step alkali dissolution

A technology of bentonite and sodalite, which is applied in the direction of aluminum silicate and silicate, can solve the problems of complex process and high cost of sodalite preparation, and achieve the effects of simplified process flow, high utilization rate and uniform particle size

Active Publication Date: 2014-03-12
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for synthesizing sodalite from bentonite, aiming at the disadvantages of high preparation cost and complex process of sodalite, provide bentonite clay with high particle dispersibility and high activity as raw material, and adjust the process conditions The one-step synthesis of sodalite not only increases the added value of bentonite raw materials, but also is environmentally friendly and has important environmental and economic benefits

Method used

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  • Sodalite synthesis method by adopting bentonite through one-step alkali dissolution
  • Sodalite synthesis method by adopting bentonite through one-step alkali dissolution
  • Sodalite synthesis method by adopting bentonite through one-step alkali dissolution

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Effect test

Embodiment 1

[0040] Embodiment 1: Sodalite is synthesized from sodium bentonite as raw material

[0041] (1) After drying and crushing the sodium-based bentonite raw material, grind it to 100 mesh;

[0042] (2) According to the chemical composition SiO in raw materials and additives after compounding 2 、Al 2 o 3 、Na 2 The molar ratio of O is 1.0:0.33:5.0 Add 10.00Kg sodium bentonite, 61.92Kg sodium hydroxide, 4.54Kg aluminum hydroxide and 350L deionized water, so that the concentration of sodium hydroxide is 3.66mol / L, and put In the reactor of the device, heat from room temperature to 90°C, stir and reflux for 7h, then keep the temperature and age for 17h;

[0043] (3) The product synthesized by the reaction is filtered and washed until the pH is 9, and the desired product is obtained after drying and grinding.

[0044] (4) Mix the filtrate obtained in step (3) with the 1st and 2nd washing water, continue to participate in the reaction, and recycle.

Embodiment 2

[0045] Embodiment 2: Sodalite is synthesized from sodium bentonite as raw material

[0046] Step (1) is identical with embodiment 1;

[0047] (2) According to the chemical composition SiO in raw materials and additives after compounding 2 、Al 2 o 3 、Na 2 The molar ratio of O is 1.0:0.33:10.0 Add 10.00Kg of sodium bentonite, 8.29Kg of sodium metaaluminate and 350L of the filtrate obtained in step (4) of Example 1 or 1 or 2 times of washing water, and add a small amount of sodium hydroxide Make the concentration of sodium hydroxide in the reaction system 7.0mol / L, place it in a reactor with a stirring device, heat it from room temperature to 90°C, stir and reflux for 3h, then keep the temperature and age for 3h;

[0048] Steps (3) and (4) are the same as in Embodiment 1.

Embodiment 3

[0049] Embodiment 3: Calcium-based bentonite is a raw material for synthesizing sodalite

[0050] Step (1) is identical with embodiment 1;

[0051] (2) According to the chemical composition SiO in raw materials and additives after compounding 2 、Al 2 o 3 、Na 2 The molar ratio of O is 1.0:0.25:6.0. Add 10.00Kg of calcium-based bentonite, 3.26Kg of aluminum hydroxide and 350L of the filtrate obtained in step (4) of Example 1 or 1 and 2 times of washing water, and add a small amount of sodium hydroxide to make The concentration of sodium hydroxide in the reaction system is 4.45mol / L, and placed in a reactor with a stirring device, heated from room temperature to 95°C, stirred and refluxed for 2 hours, then kept at constant temperature and aged for 9 hours;

[0052] Steps (3) and (4) are the same as in Embodiment 1.

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Abstract

The invention discloses a sodalite synthesis method by adopting bentonite through one-step alkali dissolution. The method comprises the following steps: step one: drying, crushing and grinding raw material bentonite; step two, mixing the raw material bentonite with auxiliaries, wherein the molar ratio of chemical components SiO2 to Al2O3 to Na2O in the mixture is 1.0:(0.4-1.0):(4.5-10); putting the mixture in a reactor with a stirring device, stirring while adding water, and performing reaction under a certain condition; step three, filtering, washing, drying and grinding the reaction product obtained through the step two, so as to obtain the sodalite. According to the invention, the whole synthetic process is completed under the condition of normal pressure and low temperature, the technological process is simplified, and the energy consumption is reduced; the sodalite is not required to be calcined and activated, and is directly activated through alkali dissolution, and the sodium hydroxide used as an alkali solvent is used as reaction raw material for continuous reaction, so that the utilization rate is high.

Description

technical field [0001] The invention belongs to the fields of development and utilization of non-metallic minerals and inorganic non-metallic materials, and specifically relates to a method for synthesizing sodalite by one-step alkali dissolution of bentonite. Background technique [0002] Sodalite is a sodium aluminosilicate mineral with a framework structure, which is formed by connecting a single four-membered and a single six-membered ring. The difference from zeolite is that the large-radius cations that balance the framework-like complex anions and add anion valence are filled in the closed cage structure. Therefore, sodalite has better large-radius cation occlusion performance and thermal stability, and can be used as an adsorbent and hydrogen storage material, and can also be used as a photochromic material. [0003] my country is a country rich in bentonite mineral reserves, which are widely distributed. And bentonite is also widely used in various fields of the n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 孙红娟彭同江何倩罗利明
Owner SOUTHWEAT UNIV OF SCI & TECH
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