Method for preparing high whiteness A-type zeolite from coal gangue

A coal gangue, high whiteness technology, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of unremoved impurities, low purity, water and acid consumption, etc., and achieve high whiteness degree and crystallinity, method simplicity and effect of narrow particle size distribution

Inactive Publication Date: 2008-07-09
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acid treatment process is complex and consumes a large amount of water and acid, resulting in waste of resources and materials
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, and its coal gangue and The mixing process of the alkali is complicated, and the impurity is not removed in the process, so the resulting product must be of low purity
At present, there are no relevant patent reports on the preparation of A-type zeolite whitening from coal gangue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Get 10g and pulverize to 100 purpose Shanxi Xinzhou coal gangue (composition is 44.42%SiO 2 , 38.72% Al 2 o 3 ), use electromagnet to physically remove iron, add sodium hydroxide to press Na 2 O and SiO 2 The molar ratio is 4:21, NaCl and SiO 2 The molar ratio is 0.01:1, mixed evenly, and calcined at 700°C for 2 hours. Then add water according to the metering, so that the alkali concentration of the alkali melt solution after adding water is 1molNa 2 O / L alkali melt solution. Add complexing agent diethylenetriaminepentaacetic acid, according to SiO 2 The molar ratio is 0.005:1, aging at 60°C for 2 hours, then heating up to 90°C for crystallization for 5 hours, filtering the crystallized product, washing with deionized water, so that the pH of the precipitate is 8, drying the product at 110°C, It is A-type zeolite detected by XRD, with a crystallinity of 96% and a whiteness of 95%.

Embodiment 2

[0022] Get 10g and pulverize into 60 purpose Shanxi Xishan coal gangue (composition is: 58.21%SiO 2 , 28.25% Al 2 o 3 ), use electromagnet to physically remove iron, add sodium carbonate to press Na 2 O and SiO 2 The molar ratio is 18:1, NaCl and SiO 2 The molar ratio is 1:1, mixed evenly, and calcined at 800°C for 0.5 hours. Then add water according to the metering, so that the alkali concentration of the alkali melt solution after adding water is 0.75molNa 2 O / L alkali melt solution, add complexing agent diethylenetriaminepentaacetic acid, according to SiO 2 The molar ratio is 0.01:1, and aluminum hydroxide is added to make SiO 2 : Al 2 o 3 The molar ratio is 1:1, aging at 70°C for 0.5 hours, then heating up to 110°C for crystallization for 20 minutes, filtering the crystallized product, washing with deionized water, so that the pH of the precipitate is 10, and drying the product at 180°C , It is A-type zeolite detected by XRD, with a crystallinity of 92% and a whit...

Embodiment 3

[0024] Get 10g and pulverize to 100 purpose Shanxi Dongqu coal gangue (composition is: 55.05% SiO 2 , 35.53% Al 2 o 3 ), remove iron by electromagnet, add sodium bicarbonate and press Na 2 O and SiO 2 The molar ratio is 30:1, NaCl and SiO 2 The molar ratio is 0.1:1, mixed evenly, and calcined at 400°C for 5 hours. Then add water according to the metering, so that the alkali concentration of the alkali melt solution after adding water is 2molNa 2 O / L alkali melt solution, add complexing agent triethanolamine, press and SiO 2 The molar ratio is 0.1:1, adding sodium aluminate makes SiO 2 : Al 2 o 3 The molar ratio is 2.5:1, aging at 30°C for 5 hours, then heating up to 80°C for crystallization for 10 hours, filtering the crystallized product, washing with deionized water, so that the pH of the precipitate is 9, and drying the product at 80°C , detected by XRD as A-type zeolite, with a crystallinity of 94% and a whiteness of 93%.

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Abstract

A process for preparing high-whiteness A-type zeolite by gangue comprises the gangue, alkali fusion agent and inorganic salt via mixing and high-temperature reaction, water dissolving alkali fusant, aging additional supplied aluminum salt, further heating up to crystallize the aluminum salt, and then obtaining dried A-type zeolite with high quality via filtering and washing the product of crystallization. The invention sufficiently activates active constituents of silica-alumina in the gangue inclusive of quartz, mixed calcining the inorganic salt, the gangue and alkali, adding complexing agent to whiten in the process of crystallization and obtaining A-type zeolite with high crystallinity, high purity and high whiteness via hydro-thermal synthesis. The process for synthesizing zeolite of the invention is simple, convenient and feasible, and the synthesized A-type zeolite has narrower grain size distribution, quite perfect crystal shape and high whiteness and crystallinity.

Description

technical field [0001] The invention relates to a method for preparing A-type zeolite, in particular to a method for preparing high-whiteness A-type zeolite from coal gangue. Background technique [0002] Coal gangue is solid waste produced during the mining and excavation of coal mines. Due to the relatively low combustion value, it cannot be used as fuel. Therefore, most of the coal gangue is stored in the form of accumulation, forming a huge gangue hill. According to statistics, the accumulated amount of coal gangue in my country has reached more than 3 billion tons, accounting for 40% of the total industrial solid waste in the country. A large amount of harmful trace elements contained in coal gangue pollute the natural environment around the gangue and need to be dealt with urgently. 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 i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14
Inventor 王万绪杨效益张泽华胡青霞赵慧娴程鹏李萍
Owner CHINA RES INST OF DAILY CHEM IND
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