Low-temperature green synthesis method of zeolite molecular sieve material by taking southern red soil as raw material

A zeolite molecular sieve, green synthesis technology, applied in crystalline aluminosilicate zeolite, sustainable manufacturing/processing, chemical industry and other directions, can solve the problems of cumbersome preparation process and high energy consumption, achieve simple process flow, low energy consumption, widely distributed effects

Inactive Publication Date: 2020-05-05
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation process, expensive organic intermediate 1-methylpyrrolidine is added, and the organic intermediate needs to be removed by high-temperature roasting (550°C). The preparation process is cumbersome and the energy consumption is high.

Method used

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  • Low-temperature green synthesis method of zeolite molecular sieve material by taking southern red soil as raw material
  • Low-temperature green synthesis method of zeolite molecular sieve material by taking southern red soil as raw material
  • Low-temperature green synthesis method of zeolite molecular sieve material by taking southern red soil as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the preparation of red soil synthetic analcime

[0021] (1) Naturally air-dry the red soil raw material, grind it, sieve it, wash it with pure water, dry it in an oven at 80° C., and then sieve it to obtain the pretreated red soil;

[0022] (2) Use an analytical balance to weigh the pre-treated red soil, auxiliary raw materials silicon dioxide and sodium hydroxide, add water and mix, the ratio of silicon to aluminum is (6–18):1, and the ratio of alkali to aluminum is (14 -40): 1; the amount of water added is 300%-500% of the total mass of the above-mentioned red soil, silicon source and alkali. The mixing and stirring speed is 400-800r / min, and the stirring time is 1-24 hours to obtain the reaction precursor;

[0023] (3) The reaction precursor is hydrothermally treated in saturated steam at 60°C-250°C for 5-40 hours to obtain an analcite product with a single crystal phase.

Embodiment 2

[0024] Embodiment 2: the phase characterization test of red soil synthetic analcime

[0025] Use the Rigaku SmartLab 9KW X-ray diffractometer to analyze the structure of the sample prepared in Example 1. The test condition is a fixed target monochromatic light source Cu-Kα, and the wavelength is like figure 1 The measured spectrum shown is completely consistent with the analcite crystal phase of the standard card numbered 41-1478, and no other crystal phase diffraction peaks are observed, indicating that an analcite product of a single crystal phase has been obtained.

Embodiment 3

[0026] Embodiment 3: Morphological characterization test of synthetic analcime in red soil

[0027] The morphology of the sample prepared in Example 1 was characterized using a Zeiss Merlin scanning electron microscope. The test conditions were a voltage of 5 kV and a current of 100 pA. like figure 2 The morphology of analcime synthesized from red soil is shown as spherical, and the average particle size of spherical particles is 80-90 μm.

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Abstract

The invention relates to a low-temperature green synthesis method for preparing analcime from red soil, and belongs to the technical field of chemical preparation of environmental ecological materials. The preparation method of the zeolite material comprises the following steps: by taking red soil as a reaction raw material, directly preparing a high-crystallinity single-crystalline-phase analcimeproduct by adopting a hydrothermal method. By using southern natural soil as the raw material, the cost is low; the technological process is simple and easy to industrialize; the synthesis steps do not involve a high-temperature process, and the process path is energy-saving and environment-friendly; the prepared zeolite product has a single analcime crystal phase, and the grain size is about 80-90 microns.

Description

technical field [0001] The invention relates to a method for synthesizing analcime by using red soil, and belongs to the technical field of chemical preparation of environmental ecological materials. Background technique [0002] Analcite is a common sodium aluminum silicate zeolite material. Natural analcime has good adsorption performance, ion exchange performance and catalytic performance. There are micropores inside the crystal structure of analcite, which can be used as ions and molecular sieves with an atomic diameter smaller than heavy metal ions such as Cu 2+ , Pb 2+ , Zn 2+ 、Ag + , Fe 3+ etc. for selective adsorption for the extraction, smelting and wastewater purification of such metals. In addition, analcime can also be used to treat fluorine-containing wastewater and remove fluoride ions in water, and the used analcime can be regenerated and reused. However, the reserves of natural analcime are scarce. Except for the analcime ore body discovered in Eqian...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
CPCC01B39/02C01P2004/61C01P2002/72C01P2004/03Y02P20/10
Inventor 陈洪罗思媛汪逸民
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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