Process for preparing moulded zeolite by utilizing coal ash

A technology for fly ash and zeolite, which is applied in inorganic chemistry, chemical instruments and methods, molecular sieves and alkali exchange compounds, etc., can solve the problems of adsorbent or catalyst carrier limitation, limitation of industrial application scope, decrease in adsorption performance, etc. Pre-activation process, solving limitations and high costs, improving plasticity

Inactive Publication Date: 2010-10-27
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN118004A and CN1155517C all disclose the method for raw material production zeolite with fly ash, but contain fly ash residue in its synthetic zeolite, limit its industrial application range
However, the zeolites prepared from fly ash are all in the form of powder, which is limited both as an adsorbent and as a catalyst carrier.
People such as Wu Deyi mentioned in their patent (CN1296129C) that the zeolite made from fly ash was pressed into granules and applied to the denitrification and dephosphorization of the filter bed. However, the pressure granulation has low mechanical strength and poor wear resistance. , Short service life, decreased adsorption performance, etc.

Method used

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  • Process for preparing moulded zeolite by utilizing coal ash
  • Process for preparing moulded zeolite by utilizing coal ash
  • Process for preparing moulded zeolite by utilizing coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Mix 30g of fly ash, 35g of Al(OH), 5g of NaOH, 3g of sodium carboxymethylcellulose and 18mL of water, seal it and put it in a steam bath at 60°C for 5 hours; Extrude and granulate on a kneading extruder; then put the granular material in a crystallization kettle with water, seal it and put it in an oven at 200°C for 12 hours; after curing, cool the crystallization kettle to room temperature with tap water; then take it out The material is placed in a temperature-programmed furnace, raised from room temperature to 700°C and kept for 6 hours, and the heating and cooling rate is controlled at 2°C / min; finally, the material is placed in a 5.0mol / L NaOH solution for zeolization, and the NaOH solution The liquid-solid ratio to the material is 15ml / g, the zeolization temperature is 120°C, and the time is 48h. Wash until neutral and dry to obtain granular zeolite.

Embodiment 2

[0046] Similar to the preparation method of the granular zeolite in Example 1, the difference lies in the ratio of raw materials, the concentration of NaOH solution and the zeolization temperature. Among them, the amount of fly ash, Al (OH) 3, NaOH, sodium carboxymethyl cellulose and water is 60g, 25g, 15g, 10g and 50mL respectively; the zeolization temperature is 100°C; the concentration of NaOH solution is 3mol / L.

Embodiment 3

[0048]Similar to the preparation method of granular zeolite in Example 1, the difference is that the amounts of fly ash, Al(OH) 3, NaOH, sodium carboxymethylcellulose and water are 45g, 15g, 10g, 6g and 30mL.

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Abstract

The invention discloses a process for preparing moulded zeolite by utilizing coal ash. The concrete method includes: coal ash, regulator, exciting agent, additive and water are fully mixed, ageing is carried out, and extrusion moulding is carried out; moulding material is subject to autoclave maintenance and then is subject to heat treatment in a programmed heating furnace, finally the moulding material is subject to zeolitization in NaOH aqueous solution, and washing and drying are carried out, thus obtaining the moulded zeolite. In the method, coal ash moulding and coal ash zeolitization are combined together, thus not only saving raw material and reducing energy consumption but also shortening process period. The moulded coal ash zeolite prepared by the method has the characteristics of high mechanical strength, simple preparation method, various shapes, low cost, corrosion resistance, light weight and a plurality of three-dimensional through pore canals, thus being capable of being widely applied to the fields of absorbing material, catalyst carrier, wall material and building material.

Description

technical field [0001] The invention relates to a manufacturing process of shaped zeolite, especially a porous shaped zeolite obtained by kneading and extruding fly ash as aggregate, which can be used as catalyst carrier, water treatment filter material, construction material and other fields . Background technique [0002] Fly ash is a solid waste generated in the production process of coal-fired power plants and enterprises, and it is one of the industrial solid wastes with the largest emissions. The stockpiling of a large amount of fly ash not only takes up valuable land resources, but also brings serious environmental pollution and potential safety hazards. Therefore, the development and utilization of fly ash has important economic and social significance for environmental protection and resource reuse. [0003] The main chemical components of fly ash are SiO2 and Al2O3, which are high-quality silica-alumina resources, and zeolite, which has good application prospects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/00
Inventor 王连军于洪霞李健生孙秀云韩卫清陈菊
Owner NANJING UNIV OF SCI & TECH
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