Method for synthesizing analcime block material by using metakaolin

A technology of metakaolin and synthetic formula, which is applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of high price and achieve the effects of low cost, good product stability and fast reaction speed

Active Publication Date: 2015-03-25
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention with the patent number 201310274337.7 discloses a method for preparing large-size analcime from geopolymers. In this method, aluminum sol and silica sol are made of chemical reagents as silicon and aluminum raw materials, and then the two are proportionally Composite sol powder is prepared by mixed hydrothermal treatment, then synthesized into geopolymer, and finally analcime is synthesized by hydrothermal treatment, but the raw materials are all expensive chemical reagents

Method used

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  • Method for synthesizing analcime block material by using metakaolin
  • Method for synthesizing analcime block material by using metakaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0020] Table 1. Different Na 2 O / Al 2 o 3 Properties and components of the resulting product

[0021] Example

[0022] According to different Na in Table 1 2 O / Al 2 o 3 Measure sodium hydroxide, add distilled water to dissolve into a solution. Take 22.2g of metakaolin and 4g of quartz powder and pre-mix them in a closed container, put them in a stirring container, slowly pour the solution into the pre-mixed powder, and vigorously stir and mix to form a preparatory material. The uniformly mixed preparatory material is compressed into a green sample at 30 MPa using a powder tablet press (using the powder tablet press produced by Tianjin Sichuang Jinshi Technology Co., Ltd., hereinafter directly referred to as a tablet press). The green sample was put into an autoclave with a volume of 5 L, and treated in saturated steam at 200° C. for 12 hours to obtain an analzem block sample. Then take out the sample and dry it at 80°C for 24 hours, then transfer it to the des...

Embodiment 6-10

[0024] Table 2. Different Al 2 o 3 / SiO 2 Properties and components of the resulting product

[0025] Example

[0026] Measure 6g of sodium hydroxide and dissolve it into a solution with 6.64g of distilled water. Get 22.2g metakaolin, and according to table 2 different Al 2 o 3 / SiO 2 Measure the corresponding amount of quartz powder, pre-mix in a closed container, put it in a stirring container, slowly pour the solution into the pre-mixed powder, and stir vigorously to become a preparatory material. The homogeneously mixed preparatory material is pressed and formed into a billet using a press at 30 MPa. Put the blank sample into an autoclave with a volume of 5L, and treat it in saturated steam at 200°C for 12 hours; then take out the sample and dry it at 80°C for 24 hours, then transfer it to a desiccator to cool, and put it under the universal testing machine Measure its flexural strength, the test piece of destruction is ground into powder and is used for X...

Embodiment 11-14

[0028]Take 6g of sodium hydroxide, and add distilled water into sodium hydroxide to dissolve into a solution according to the different water volumes described in Table 3. Take 22.2g of metakaolin and 4g of quartz powder and pre-mix in a closed container for 5 minutes, then place in a stirring container, slowly pour the solution into the pre-mixed powder, and stir to mix. Take the uniformly mixed preparatory material, and use a press to press and shape it under 30MPa. Put the blank sample into an autoclave with a volume of 5L, and treat it in saturated steam at 200°C for 10 hours; then take out the sample and dry it at 80°C for 24 hours, then transfer it to a desiccator to cool, and put it under the universal testing machine Measure its flexural strength, and the test block of destruction is ground into powder and is used for X-ray powder diffraction analysis (XRD), and embodiment 11-14 corresponding water content and flexural strength thereof are as shown in table 3, along wi...

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Abstract

The invention relates to a method for synthesizing an analcime block material by using metakaolin. The method comprises the following steps: firstly, measuring metakaolin, quartz flour, NaOH and water to ensure that the molar ratio of Na2O to Al2O3 is 0.4-2.6, and the molar ratio of SiO2 to Al2O3 is 0.20-0.50; secondly, adding water into NaOH, and stirring to obtain a solution, wherein the added amount of water is 19.0-21.0% of the total mass of the metakaolin, quartz flour and NaOH; thirdly, uniformly mixing the metakaolin and the quartz flour, then adding the mixture into the solution, and uniformly mixing to obtain a prepared material; and finally, putting the prepared material into a pelletizer, performing compression molding at a pressure of 10-50MPa, putting the material into a still kettle, and performing hydro-thermal treatment in saturated steam at 80-220 DEG C for 2-36 hours, thereby obtaining a block material taking the metakaolin as a main product phase. The method provided by the invention is simple in process, low in cost, and easy to realize industrialization, the product can be widely used for performing water purification and contaminated soil restoration, and curing cesium-containing radioactive wastes, and no secondary waste is generated.

Description

technical field [0001] The invention relates to a method for synthesizing analcite block material by using metakaolin, which belongs to the cross field of material synthesis and harmful substance treatment. Background technique [0002] As a member of the zeolite family, analcime has high hydrothermal stability, high selectivity and good ion exchange properties, and plays a huge role in chemical catalysis, adsorption, ion exchange and even energy storage. Due to its special tiny pore size, analcime is also a natural ion sieve, which is more conducive to the application of special fields such as water purification and contaminated soil remediation. In addition, because analcime has a particularly good ion exchange capacity for cesium elements, and a solid solution system in which cesium and sodium coexist in nature, analcime is also a good curing material for curing cesium-containing radioactive waste. This also becomes the special purpose of this solidified base material wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
CPCC01B39/02
Inventor 景镇子范俊杰章毅李艳何晓俊
Owner TONGJI UNIV
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