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Method for synthesis of zeolite from fly ash

A technology for synthesizing zeolite and fly ash, which is applied in the direction of crystalline aluminosilicate zeolite and solid waste removal, which can solve the problems of poor cracking effect and low utilization rate of fly ash resources, and achieve simple production process and shortened rubber The effect of shortening the time and simplifying the iron removal process

Active Publication Date: 2015-03-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The direct hydrothermal method uses high-concentration lye to decompose fly ash. This method has relatively mild conditions, but it has a poor effect on decomposing crystal structures such as quartzite and mullite, which are relatively stable in fly ash. Resource utilization is not high

Method used

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  • Method for synthesis of zeolite from fly ash
  • Method for synthesis of zeolite from fly ash
  • Method for synthesis of zeolite from fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A kind of method for synthesizing zeolite from coal ash of the present embodiment comprises the steps:

[0030] Step 1: Mix the raw materials, take 20.00g of fly ash and 54.48g of NaOH (that is, the molar ratio of soda to ash is 3:1) and place them in a 100mL crucible, stir and mix evenly with a glass rod;

[0031] Step 2: Solid alkali melting, put the crucible containing fly ash and alkali in a muffle furnace for melting at 800°C for 1 hour, take it out and let it cool naturally, then crush it and perform mechanical ball milling until the particle size is less than 1 μm, and obtain melting Sample, weighing mass;

[0032] Step 3: Dissolve, take 5g of the molten sample and dissolve it in 100mL of deionized water (that is, the liquid-solid mass ratio is 20:1), stir and dissolve, filter and wash to obtain the extract;

[0033] Step 4: Concentrate, concentrate the extract to 40ml by rotary evaporation, that is, the liquid-solid mass ratio is 8:1, the gelation time is 20min...

Embodiment 2

[0037] This embodiment is a method for synthesizing zeolite from fly ash. The steps are the same as in Example 1, the difference is that the quality of NaOH in step 1 is 27.24g (that is, the molar ratio of soda to ash is 1.5:1), and in step 2, the zeolite is synthesized at 700°C. Melting for 3 hours, the hydrothermal reaction temperature in step 5 was 100°C, and the time was 24 hours.

Embodiment 3

[0039] This embodiment is a method for synthesizing zeolite from fly ash. The steps are the same as in Example 1, the difference is that the quality of NaOH in step 1 is 18.16g (that is, the molar ratio of soda to ash is 1:1), and in step 2, 500 ° C Melt for 2h, and the reaction time in step 5 is 24h.

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Abstract

A method for synthesis of zeolite from fly ash comprises the following steps: putting the fly ash and alkali ash in accordance with the molar ratio of 1:1 to 4:1 into a crucible, mixing evenly, putting into a muffle furnace for melting at 500-900 DEG C for 0.5-4H, taking out, naturally cooling, crushing to obtain a molten sample; taking 2.5-10g of the molten sample to dissolve in 100ml of deionized water, stirring for dissolving, filtering and washing to obtain extract; rotatably evaporating the extract to concentrate to 40ml, gelling for 20-40min; putting in a 50ml hydrothermal reaction kettle, sealing, putting into the muffle furnace at the temperature of 100 to 120 DEG C for 12-48h, performing hydrothermal reaction; cooling to room temperature, filtering by suction, washing and drying to obtain a zeolite crystal sample; the method improves the quality and yield of zeolite, reduces cost, simplifies the technical process, and provides a new way for high grade resource utilization of industrial solid waste fly ash.

Description

technical field [0001] The invention belongs to the technical field of resource treatment and disposal of by-product fly ash in the coal-fired power generation industry, and in particular relates to a method for synthesizing zeolite from fly ash. Background technique [0002] According to the 2013 operation of the power industry published by the National Energy Administration of China, the installed capacity of fossil energy power generation accounts for about 70%, and my country's power generation is still dominated by thermal power generation. Due to its high output and low price, coal has become the main fuel for thermal power generation. The by-product of combustion, fly ash, has also become one of the largest industrial wastes in my country. The output in 2013 has reached 532 million tons. If a large amount of fly ash is not properly disposed of, it may cause problems such as dust pollution and land occupation. The main chemical components of fly ash are oxides of sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B09B3/00
CPCC01B39/02C01P2002/72C01P2006/12C01P2006/90
Inventor 蒋建国李天然颜枫
Owner TSINGHUA UNIV
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