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A kind of synthetic method of solid waste block ZSM-5 zeolite molecular sieve

A technology of ZSM-5, zeolite molecular sieve, applied in the direction of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of not finding crystal seed guidance and the like

Active Publication Date: 2021-06-11
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the inventor consulted a large number of domestic patents and literature through the system, and found no relevant reports on the block ZSM-5 zeolite molecular sieve with seed crystal guidance, solid waste silica fume as the silicon source, and metakaolin to adjust the silicon-aluminum ratio.

Method used

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  • A kind of synthetic method of solid waste block ZSM-5 zeolite molecular sieve
  • A kind of synthetic method of solid waste block ZSM-5 zeolite molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Accurately weigh silica fume, metakaolin, ZSM-5 seed crystals, sodium hydroxide, and deionized water at a mass ratio of 4:1:0.3:0.75:2.35; mix solid silica fume, metakaolin and ZSM-5 seed crystals Put it in a mixer and stir it into a mixture; dissolve the solid sodium hydroxide into deionized water, then pour the aqueous sodium hydroxide solution into the mixer containing the mixture and stir again to form a uniformly mixed slurry; put the slurry Put it into a 2cm×2cm×2cm six-unit steel mold, and vibrate it on a plastic sand vibrating table; seal the mold with a plastic film sealing bag, put it in a constant temperature box for 24 hours at 50°C, and then take it out and demould to obtain a block Put the block test piece into the reaction kettle, add 75mL deionized water, and seal the kettle; 180°C hydrothermal reaction for 24h, take it out and dry it to get the block ZSM-5 zeolite molecular sieve. The physical photo of the synthesized block ZSM-5 zeolite molecular sieve...

Embodiment 2

[0056] Accurately weigh silica fume, metakaolin, ZSM-5 seed crystals, sodium hydroxide, and deionized water with a mass ratio of 4:1:0.2:0.75:2.35; put solid silica fume, metakaolin and seed crystals into the mixer Stir in the mixture to form a mixture; dissolve the solid sodium hydroxide into deionized water, then pour the aqueous sodium hydroxide solution into the mixer containing the mixture and stir again to form a uniformly mixed slurry; put the slurry into 2cm ×2cm×2cm six-unit steel mould, vibrate on a plastic sand vibrating table; the mold is sealed with a plastic film sealing bag, placed in a constant temperature box at 50°C for 24 hours, then taken out, demolded, and a block specimen is obtained ; put the block test piece into the reaction kettle, add 75mL of distilled water, seal the kettle; 180 ℃ hydrothermal reaction for 24h, take it out and dry to get the block ZSM-5 zeolite molecular sieve. The physical photo of the synthesized block ZSM-5 zeolite molecular siev...

Embodiment 3

[0058] Accurately weigh silica fume, metakaolin, ZSM-5 seed crystal, sodium hydroxide, and deionized water with a mass ratio of 4.25:1:0.305:0.75:2.5; put solid silica fume, metakaolin and seed crystal into the mixer Stir in the mixture to form a mixture; dissolve the solid sodium hydroxide into deionized water, then pour the aqueous sodium hydroxide solution into the mixer containing the mixture and stir again to form a uniformly mixed slurry; put the slurry into 2cm ×2cm×2cm six-unit steel mould, vibrate on a plastic sand vibrating table; the mold is sealed with a plastic film sealing bag, placed in a constant temperature box at 50°C for 24 hours, then taken out, demolded, and a block specimen is obtained ; Put the block test piece into the reaction kettle, add 75mL of distilled water, seal the kettle; 180 ℃ hydrothermal reaction for 24h, take it out and dry to get the block ZSM-5 zeolite molecular sieve. The physical photo of the synthesized block ZSM-5 zeolite molecular si...

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Abstract

The invention discloses a method for synthesizing a solid waste block ZSM-5 zeolite molecular sieve. Silica fume, metakaolin, seed crystals, solid sodium hydroxide and deionized water are prepared in a mass ratio of 4-4.25:1:0.2-0.305 :0.75:2.35~2.5 Synthesize block ZSM‑5 zeolite molecular sieve through processes such as stirring and mixing, forming, curing, hydrothermal reaction, etc. The method directly uses untreated solid waste silica fume as a silicon source, adjusts the Si / Al ratio with metakaolin, and synthesizes a block ZSM‑5 zeolite molecular sieve; the synthesis process does not need to add a template agent, which avoids the high-temperature roasting decomposition of the template agent. high energy consumption and environmental pollution; at the same time, the synthesized block ZSM-5 zeolite molecular sieve overcomes many problems of filtration and separation in the application process of powder particles. The synthesis process is simple and low-cost, and can realize industrial solid waste and High value-added utilization of natural minerals.

Description

technical field [0001] The invention belongs to the field of the preparation of zeolite molecular sieves and the resource utilization of solid waste, and relates to the synthesis of molecular sieves, in particular to a method for synthesizing solid waste block ZSM-5 zeolite molecular sieves. Background technique [0002] Silica fume, also known as silica dust and micro silica fume, is a large amount of dust solid waste collected from the flue gas when ferrosilicon is produced in ferrosilicon factories. 1t of silica fume will be produced for every 3t of metallic silicon or 5t of ferrosilicon alloy [1，2] . Silica fume is a kind of micropowder particles with an average particle size of 0.15-0.20μm, of which particles with a particle size of less than 1μm account for about 80%, and have a large specific surface area [3] . my country's ferrosilicon metallurgical enterprises are mainly concentrated in the northwest region, among which Qinghai, Inner Mongolia and Gansu are the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/38
CPCC01B39/38C01P2002/72C01P2004/01
Inventor 张耀君陈浩贺攀阳韩智超张叶刘礼才
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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