Synthesis method of solid waste multi-stage hole block body ECR-1 zeolite

Abstract

The invention discloses a synthesis method of solid waste multi-stage hole block body ECR-1 zeolite. A water solution of silica fume, metakaolin, mordenite crystal seeds and sodium hydroxide is put into a stirring device to be stirred to form slurry; through mold shaping, caring and demolding, a block body is obtained; then, the block body is put into a reaction kettle to be crystallized so as toobtain a multi-stage hole block body ECR-1 zeolite molecular sieve, wherein the mass ratio of the silica fume to the metakaolin to the mordenite crystal seeds to the solid sodium hydroxide to deionized water is 2.3 to 1 to 0.2 to 0.5 to 1.57. In the preparation process, the addition of a template agent is not needed; high energy consumption and environment pollution caused by high-temperature roasting decomposition of the organic template agent are avoided. Meanwhile, the synthesized block body molecular sieve overcomes various defects of filtering, separation and the like of powder particlesin the application process; the synthesis process technology is simple; the cost is low; the crystallization time is greatly shortened; the high-added value utilization of industrial solid waste and natural ore can be realized.

Description

technical field [0001] The invention belongs to the field of synthesis of zeolite molecular sieves and the utilization of solid waste resources thereof, and relates to the synthesis of zeolite molecular sieves, in particular to a method for synthesizing green resource utilization multi-stage porous block ECR-1 zeolite of silica fume, which is a solid waste. Background technique [0002] Silica fume is a by-product of the smelting process of alloys such as metal silicon or ferrosilicon, usually white or gray, with a large specific surface area and high activity [1-2] . Silica fume contains a large amount of active silicon oxide, and its resource utilization can not only reduce environmental pollution, improve the ecological environment, but also turn waste into treasure, which is one of the important ways for the sustainable development of the silicon industry. [0003] At present, silica fume is mainly used in concrete admixtures [3] , cement mixture [4] , Refractories [...

AI Technical Summary

Problems solved by technology

[0007] Although the synthesis of ECR-1 molecular sieve has gone through the process of transition from the organic template method to the seed-directed method without organic templates, the raw materials used have not undergone essential breakthroughs, and the traditional water glass is still used as the silicon source. Sodium metaaluminate is the source of aluminum, and the seed crystal orientation directly related to its structure is not used, resulting in a long crystallization cycle, and the fastest time reported in the literature is 4 days

[0008] In summary, the applicant systematically consulted a large number of domestic patents and literature, and found no relevant reports on the synthesis of bulk ECR-1 zeolite molecular sieves from silica fume and metakaolin under the guidance of seed crystals.

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