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Method for preparing A type zeolite by gangue

A coal gangue and zeolite technology, which is applied in the field of two-step preparation of A-type zeolite, can solve the problem of low product purity, and achieve the effects of small device, high crystallinity, and simple and easy method

Inactive Publication Date: 2005-06-29
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ni Zheng et al. described in "Petrochemical Industry" 2000, 29 (4): 336 pages "preparing NaX type zeolite from coal gangue" in the article, using coal gangue alkali fusion activation and hydrothermal synthesis to obtain NaX type zeolite, but in the process Without removing impurities, the resulting product must be of low purity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Get 5g and be pulverized into 60 purpose Shanxi Malan coal gangue (consisting of: 49.85% SiO 2 , 37.25% Al 2 o 3 ) was calcined at 800°C for 2 hours. Then add sodium hydroxide to press Na 2 O and SiO 2 The molar ratio is 1.5, mixed evenly, and reacted at 400°C for 6 hours. According to the molar ratio of water to sodium as H 2 O / Na 2 O=34, add water to the alkali melt, remove iron by physical method, add aluminum hydroxide to make the molar ratio of silicon to aluminum is 2. Reaction crystallization was carried out at 80° C. for 0.5 hours. The crystallized product was filtered, washed with deionized water, the pH of the precipitate was adjusted to 8, and dried at 110°C to obtain the product, which was detected as zeolite A by X-ray diffraction.

Embodiment 2

[0020] Get 5g and pulverize to 100 purpose Shanxi Dongqu coal gangue (composition is: 55.05%SiO 2 , 35.83% Al 2 o 3 ) was calcined at 500°C for 8 hours. Then add sodium hydroxide to press Na 2 O and SiO 2 The molar ratio was 1.5, mixed uniformly, and reacted at 650°C for 4 hours. According to the molar ratio of water to sodium as H 2 O / Na 2 O=60, add water to the alkali melt, remove iron by physical method, then add alumina, so that the molar ratio of silicon to aluminum is 1.5. The reaction crystallization was carried out at 80° C. for 3 hours. The crystallized product was filtered, washed with deionized water, the pH of the precipitate was adjusted to 9, and dried at 100°C to obtain the product, which was detected as A zeolite by X-ray diffraction.

Embodiment 3

[0022] Get 5g and pulverize to 80 purpose Shanxi Tunlan coal gangue (composition is: 58.20%SiO 2 , 26.84% Al 2 o 3 ) was calcined at 700°C for 4 hours. Then add sodium hydroxide to press Na 2 O and SiO 2 The molar ratio was 1.9, mixed evenly, and reacted at 400°C for 8 hours. According to the molar ratio of water to sodium as H 2 O / Na 2 O=15, add water to the alkali melt, remove iron by physical method, then add aluminum sulfate, so that the molar ratio of silicon to aluminum is 2.0. The reaction crystallization was carried out at 25° C. for 240 hours. The crystallized product was filtered, washed with deionized water to make the pH of the precipitate 10, and dried at 80°C to obtain the product, which was detected as A zeolite by X-ray diffraction.

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Abstract

The invention is a method of prepare A zeolite with coal gangue which is by burning the coal gangue and mixing it with alkaline fusion solution to react at high temperature, then extracting the alkaline fusion in the water to remove the Fe, adding aluminum salt and heating to crystallize, finally filtering, washing and drying the crystallization to obtain the high quality A zeolite. The invention has got advantages such as easy and simple techniques in the process, small reacting devices, low cost, exact repeatability. The obtained A zeolite is of narrower particle distribution, quite perfect crystal shape and high crystalline.

Description

technical field [0001] The invention relates to a method for preparing A-type zeolite, in particular to a method for preparing A-type zeolite by using coal gangue as a raw material in two steps. Background technique [0002] my country's existing coal gangue stockpile is 3 to 4 billion tons. The accumulation of coal gangue occupies land, pollutes soil and water quality, destroys ecological balance, and causes serious environmental problems. It is one of the most difficult problems in the world today. With the further implementation of the global sustainable development strategy and the further deepening of my country's industrialization process, the Chinese government is increasing its efforts in environmental protection. Carrying out research on the comprehensive utilization and development of coal gangue, extracting various chemical products from coal gangue, not only improves the environment, solves the idle resources and occupied land, but also turns waste into treasure...

Claims

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Application Information

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IPC IPC(8): C01B39/14
Inventor 王万绪杨效益李秋小胡青霞杨秀全张威姚新爱赵伟
Owner CHINA RES INST OF DAILY CHEM IND
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