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Method for making coal ash into faujasite through microwave alkali fusion-hydro-thermal synthesis

A faujasite and hydrothermal synthesis technology, which is applied in the field of solid waste resource utilization, can solve the problems of low conversion rate of Si and Al, high calcination temperature, and low synthesis temperature, and achieve short calcination and crystallization time, The production process is simple and the effect of improving the conversion rate

Inactive Publication Date: 2017-01-04
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis temperature of hydrothermal synthesis method is low (about 90-100 ℃), but there are disadvantages such as long synthesis time (more than 48 h), low conversion rate of Si and Al, and the formation of zeolite with by-products.
The alkali fusion method can shorten the synthesis time and improve the conversion rate of fly ash, but due to the traditional heating method, there are disadvantages such as high roasting temperature (over 800°C), long roasting time (generally 2h) and high energy consumption.
Although the microwave-assisted method can shorten the crystallization time, there are disadvantages such as low silicon-aluminum conversion rate due to the fact that the fly ash is not activated by roasting.

Method used

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  • Method for making coal ash into faujasite through microwave alkali fusion-hydro-thermal synthesis
  • Method for making coal ash into faujasite through microwave alkali fusion-hydro-thermal synthesis
  • Method for making coal ash into faujasite through microwave alkali fusion-hydro-thermal synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Grind the fly ash to -75 μm.

[0029] The content of ferric oxide in the fly ash used in this experiment is relatively high. In order to eliminate the influence of iron impurities on the synthetic zeolite, the fly ash was pickled to remove impurities. Mix 15% hydrochloric acid and fly ash at a liquid-solid ratio of 10:1, stir at a constant temperature of 200 r / m for 1 h at 80 °C, filter, wash with deionized water until neutral, and dry.

[0030] Weigh 5g of hydrochloric acid-treated fly ash and 6g of sodium hydroxide and mix them evenly in a mass ratio of 1:1.2, then transfer them into a silicon carbide crucible, and place the crucible in a microwave box-type high-temperature reactor at a temperature of 450°C Under the conditions of microwave alkali fusion for 15 minutes, after the alkali fusion product is cooled, grind it finely.

[0031] Add 70 mL of deionized water to the alkali-melted fly ash, even if the concentration of sodium hydroxide is 2.1 mol / L, and stir it ...

Embodiment 2

[0036] Grind the fly ash to -75 μm.

[0037] Mix 15% hydrochloric acid and fly ash at a liquid-solid ratio of 5:1, stir at a constant temperature of 200 r / m for 2 h at 90 °C, filter, wash with deionized water until neutral, and dry.

[0038] Weigh 5g of hydrochloric acid-treated fly ash and 6g of sodium hydroxide and mix them in a mass ratio of 1:1.2, then transfer them into a silicon carbide crucible, and place the crucible in a microwave box-type high-temperature reactor at a temperature of 550°C Under the condition of microwave alkali fusion for 60 minutes, after the alkali fusion product is cooled, grind it finely.

[0039] Add 80 mL of deionized water to the alkali-melted fly ash, even if the concentration of sodium hydroxide is 1.9 mol / L, and stir it magnetically at room temperature at 400 r / m for 5 h.

[0040] Heat the alkali-melted fly ash suspension at 95°C for 14 hours to crystallize.

[0041] The reaction product was cooled to room temperature, filtered, washed wi...

Embodiment 3

[0044] Grind the fly ash to -75 μm.

[0045] Mix 15% hydrochloric acid and fly ash at a liquid-solid ratio of 5:1, stir at a constant temperature of 200 r / m for 2 h at 85 °C, filter, wash with deionized water until neutral, and dry.

[0046] Weigh 5g of hydrochloric acid-treated fly ash and 6g of sodium hydroxide and mix them in a mass ratio of 1:1.2, then transfer them into a silicon carbide crucible, and place the crucible in a microwave box-type high-temperature reactor at a temperature of 350°C Under the condition of microwave alkali fusion for 60 minutes, after the alkali fusion product is cooled, grind it finely.

[0047] Add 90 mL of deionized water to the alkali-melted fly ash, even if the concentration of sodium hydroxide is 1.7 mol / L, and stir it magnetically at room temperature at 400 r / m for 4 h.

[0048] Heat the alkali-melted fly ash suspension at 90°C for 12 hours to crystallize.

[0049] The reaction product was cooled to room temperature, filtered, washed wi...

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Abstract

The invention discloses a method for making coal ash into faujasite through microwave alkali fusion-hydro-thermal synthesis. Solid waste of coal ash is used as raw materials; sodium hydroxide is used as an activating agent; the microwave alkali fusion-hydro-thermal synthesis is used for making the faujasite. The method comprises the following steps of (1) grinding the coal ash into -75mum; removing iron impurities in the coal ash by hydrochloric acid; (2) uniformly mixing the coal ash subjected to iron removal with sodium hydroxide; then, performing calcination in a microwave box type high-temperature reactor; performing fine grinding after a alkali fusion product is cooled; (3) mixing and stirring alkali fusion coal ash and deionized water for a certain time; heating the material to 90 to 100 DEG C for still standing and crystallization for 12 to 16h; (4) filtering and washing reaction products to a neutral state, and performing drying to obtain faujasite products. A conventional calcination mode is changed; the microwave alkali fusion coal ash is used; the advantages of low calcination temperature, short calcination and crystallization time, low energy consumption, cleanness, environment protection, high coal ash conversion rate, low cost and the like are realized; the possibility is provided for the industrial production of preparing faujasite from the coal ash.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a method for synthesizing faujasite by microwave alkali fusion-hydrothermal synthesis of fly ash. Background technique [0002] Fly ash is a solid waste produced during the combustion of pulverized coal in thermal power plants. With the rapid advancement of my country's industrialization and urbanization, the discharge of fly ash has increased year by year. By 2015, the total discharge of fly ash in my country has reached 5.8 billion tons, while the actual utilization rate of fly ash in my country is only 30%. , so a large amount of fly ash has not been effectively utilized. The stockpiling of fly ash will occupy a large amount of land resources, threaten public health and pollute the environment. [0003] Zeolite is an aluminosilicate compound with a cubic lattice. It has a large specific surface area due to the uniform distribution of pores and cavi...

Claims

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Application Information

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IPC IPC(8): C01B39/20
CPCC01B39/20C01P2002/72C01P2004/03C01P2006/12
Inventor 李显波张覃刘志红卯松李龙江邱跃琴
Owner GUIZHOU UNIV
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