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High-temp alkali fusing-hydrothermal crystallizing process for preparing A-type zeolite from coal gangue

A technology of hydrothermal crystallization and coal gangue, applied in A-type crystalline aluminosilicate zeolite, chemical instruments and methods, crystalline aluminosilicate zeolite, etc., can solve the problems of complex composition, waste of resources, and lower quality of zeolite products. , to achieve the effect of broad application prospects, easy operation and low price

Inactive Publication Date: 2002-05-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these processes cannot activate inert silicon-aluminum sources, such as quartz, due to simple heating and roasting, and all require the coal gangue used to be relatively pure kaolin, otherwise the zeolite product will be impure and contain invalid quartz components, which will not only reduce The quality of zeolite products is compromised, and a lot of resources are wasted
Due to the complex composition of coal gangue, there are great differences from place to place, especially the coal gangue in southern my country has a large quartz content, and pure zeolite products cannot be obtained by the existing roasting-hydrothermal crystallization method

Method used

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  • High-temp alkali fusing-hydrothermal crystallizing process for preparing A-type zeolite from coal gangue

Examples

Experimental program
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Effect test

example 1

[0023] With 500 grams of coal gangue from Shanxi Sanyuan Coal Industry Co., Ltd. (containing C49.4%, SiO 2 25.8%, Al 2 o 3 13.1%, the main crystal phase is kaolinite and quartz), adding aluminum hydroxide to adjust the ratio of silicon to aluminum to SiO 2 / Al 2 o 3 is 2.5, add solid sodium hydroxide to make the alkali-silicon ratio (Na 2 O / SiO 2 ) is 1.8, and it is ground and mixed in a ball mill jar. Put the coal gangue with adjusted silicon-aluminum ratio and alkali-silicon ratio into a porcelain boat, and bake it in a muffle furnace at 850°C for 5 hours to obtain a light green frit. Add water to the frit so that the water-alkali ratio reaches 70, put it into a crystallization kettle for crystallization at 80°C for 19 hours, wash and dry to obtain a sample, and detect it as A-type zeolite, the relative crystallinity exceeds 95%. See accompanying drawing for XRD spectrum.

example 2

[0027] The experimental procedure is the same as above, but the crystallization time is shortened to 10 hours, and the obtained sample is detected as type A zeolite by XRD, and the relative crystallinity exceeds 92%.

example 3～6

[0029] Take 3 grams of coal gangue from Shanxi Sanyuan Coal Industry Co., Ltd., grind and pulverize it in a mortar, add aluminum hydroxide to make the ratio of silicon aluminum to SiO 2 / Al 2 o 3 is 2.5, add sodium hydroxide solution to make the alkali-silicon ratio (Na 2 O / SiO 2 ) is 1.8, and it is ground and dried under an infrared lamp. Put the porcelain boat into the tube furnace and bake at 120°C for half an hour to remove water, and then bake at 850°C for 3 hours in an air atmosphere. Add water to the obtained frit until the water-alkali ratio H 2 O / Na 2 O is 60, aged at room temperature for 24 hours, and crystallized at 55°C for 12, 24, 48, and 72 hours respectively. The obtained samples are all A-type zeolites after inspection, and the relative crystallinity is 36%, 87%, 91%, respectively. 100%, the impurity phase is amorphous silicon aluminum.

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Abstract

A process for preparing A-type zeolite from coal gangue includes high-temp fusing of coal gangue in alkali flux, adding water and crystallizing. In the process, the Na2O / SiO2, SiO2 / Al2O3 and H2O / Na2O are respectively controlled to be (1-3), (1-3.5) and (30-150). Its advantages are full activation of all active Si and Al components in coal gangue, high crystallinity and high purity.

Description

technical field [0001] The invention relates to a method for preparing A-type zeolite by high-temperature alkali fusion-hydrothermal crystallization using coal gangue as raw material. Type A zeolite is a commonly used artificially synthesized zeolite, which has a rich three-dimensional microporous structure and a large surface area. Background technique [0002] Coal gangue is the hard, low-carbon part of the coal seam. The output is very large, about 10-20% of the raw coal output. The open-air stacking of a large amount of coal gangue not only invades the land, but also destroys the ecological balance. It is one of the three major industrial wastes. At present, people's main utilization methods are combustion of residual carbon in coal gangue to generate electricity, preparation of building materials and extraction of chemical raw materials, etc., but they all have problems such as low utilization rate of active ingredients or high cost. The preparation of zeolite molecu...

Claims

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Application Information

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IPC IPC(8): B01J20/18C01B39/14
Inventor 唐颐夏建超任楠董安钢朱峰
Owner FUDAN UNIV
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