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Method for synthesizing zeolite by one-step alkaline solution of bentonite

A technology of bentonite and zeolite, which is applied in the directions of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, faux crystalline aluminosilicate zeolite, etc., can solve the problems of complex process and high cost of zeolite preparation, and simplify the process flow. , low price, fine-grained effect

Active Publication Date: 2015-08-05
杭州洁铸科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for synthesizing zeolite from bentonite. Aiming at the shortcomings of zeolite preparation such as high cost and complex process, it provides bentonite clay with high particle dispersion and high activity as raw material, and adjusts the process conditions to synthesize zeolite in one step. It not only improves the added value of bentonite raw materials, but also is green and environmentally friendly, with important environmental and economic benefits

Method used

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  • Method for synthesizing zeolite by one-step alkaline solution of bentonite
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  • Method for synthesizing zeolite by one-step alkaline solution of bentonite

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Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: Na-based bentonite is a raw material for synthesizing 4A zeolite

[0049] (1) After drying and crushing the sodium-based bentonite raw material, grind it to 100 mesh;

[0050] (2) According to the chemical composition SiO in raw materials and additives after compounding 2 、Al 2 o 3 、Na 2The molar ratio of O is 1.0:0.67:3.0. Add 10.00Kg sodium bentonite, 30.96Kg sodium hydroxide, 11.25Kg aluminum hydroxide and 350L deionized water so that the concentration of sodium hydroxide is 2.2mol / L, and place the In the reactor of the device, heat from room temperature to 80°C, stir and reflux for 3h, then keep the temperature and age for 9h;

[0051] (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.

[0052] (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

[0053] Embodiment 2: Na-based bentonite is a raw material for synthesizing 4A zeolite

[0054] Step (1) is the same as step (1) in Example 1;

[0055] Step (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 1.0:0.5:2.0 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 1.0mol / L, place it in a reactor with a stirring device, heat it from room temperature to 80°C, stir and reflux for 10h, then keep the temperature and age for 20h;

[0056] Steps (3) and (4) are the same as in Embodiment 1.

Embodiment 3

[0057] Embodiment 3: Na-based bentonite is a raw material for synthesizing P-type zeolite

[0058] Step (1) is the same as step (1) in Example 1;

[0059] Step (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 1.0:0.25:3.2 Add 10.00Kg of sodium bentonite, 3.01Kg of sodium metaaluminate and 350L of the filtrate obtained in step (4) of Example 2 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 2.20mol / L, place it in a reactor with a stirring device, heat it from room temperature to 90°C, stir and reflux for 5h, then keep the temperature and age for 9h;

[0060] Steps (3) and (4) are the same as in Embodiment 1.

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Abstract

The invention discloses a method for synthesizing zeolite by one-step alkali dissolution of bentonite. The method comprises the following steps: step one, drying, crushing and grinding bentonite raw material; step two, mixing the bentonite raw material with an auxiliary agent to allow the molar ratio of chemical components of SiO2, Al2O3 and Na2O to be 1.0:(0.15-1.0):(1.5-4.0) in the mixture, placing the mixture in a reactor with a stirring device, adding water while stirring, and carrying out a reaction under a certain reaction condition; and step three, filtering, washing, drying and grinding the reaction product of the step two, and thus obtaining zeolite. The whole synthetic process is completed under conditions of ordinary pressure and low temperature in one step, so the process is simplified, and the energy consumption is reduced; and bentonite needs no calcination activation, is directly activated by alkali dissolution, then is used as an alkali solvent sodium hydroxide and also as the reaction raw material to continue reaction, and has high utilization rate.

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 zeolite by one-step alkali dissolution of bentonite. Background technique [0002] Zeolite molecular sieves are a class of aluminosilicate minerals with a hollow framework structure. There are regular channels and holes in its structure, and movable cations and water molecules are distributed in the holes, that is, hydration cations and zeolite water. This structural feature makes zeolite have excellent ion exchange, catalytic and adsorption properties, and is widely used in petrochemical, chemical industry, environmental protection and other industrial fields, especially 4A zeolite is more widely used in the washing industry; P-type zeolite is not only It has a good ion exchange effect on calcium and magnesium, and also has a strong adsorption capacity of non-ionic surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02C01B39/14C01B39/22
Inventor 孙红娟彭同江何倩罗利明
Owner 杭州洁铸科技有限公司