Process for preparing 4a zeolite from azs solid waste

A solid waste and zeolite technology, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problem of low added value and achieve the effects of low production cost, no waste water discharge, and simple process route

Active Publication Date: 2017-10-13
SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a process for preparing 4A zeolite from AZS solid waste, which solves the problem of low added value of products produced from AZS solid waste, and has a simple process route and no waste water discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] AZS solid waste, the main composition is: Al 2 o 3 60%, SiO 2 15%, ZrO 2 20%. The process of preparing 4A zeolite from AZS solid waste is as follows:

[0030] (1) Alkali fusion roasting:

[0031] Mix AZS solid waste, sodium hydroxide, and flux borax in a weight ratio of 1:1:0.5, and bake at a temperature of 800°C for 80 minutes to obtain a sintered material. The zirconia and trioxide in the AZS solid waste Dialuminum and silicon dioxide are converted into sodium zirconate, sodium metaaluminate and sodium metasilicate respectively;

[0032] (2) Separation by water immersion:

[0033] Add water to the sintered material obtained in step (1), the weight ratio of sintered material to water is 1:3, raise the temperature to 80°C, stir for 40 minutes, and obtain the primary leaching solution of sodium metasilicate and sodium metaaluminate after filtering. The leaching rate is 90%, and the sodium zirconate solid is leached with water for 2-3 times, and the subsequent leac...

Embodiment 2

[0038] AZS solid waste, the main composition is: Al 2 o 3 60%, SiO 2 15%, ZrO 2 20%. The process of preparing 4A zeolite from AZS solid waste is as follows:

[0039] (1) Alkali fusion roasting:

[0040] Mix AZS solid waste, sodium hydroxide, and flux borax in a weight ratio of 1:0.85:0.8, and roast at a temperature of 650°C for 90 minutes to obtain a sintered material. The zirconia and trioxide in the AZS solid waste Dialuminum and silicon dioxide are converted into sodium zirconate, sodium metaaluminate and sodium metasilicate respectively;

[0041] (2) Separation by water immersion:

[0042] Add water to the sintered material obtained in step (1), the weight ratio of sintered material to water is 1:5, raise the temperature to 85°C, stir for 1 hour, and obtain the primary leaching solution of sodium metasilicate and sodium metaaluminate after filtration. The leaching rate is 92%, and the sodium zirconate solid is leached with water for 2-3 times, and the subsequent lea...

Embodiment 3

[0047] AZS solid waste, the main composition is: Al 2 o 3 60%, SiO 2 15%, ZrO 2 20%. The process of preparing 4A zeolite from AZS solid waste is as follows:

[0048] (1) Alkali fusion roasting:

[0049] Mix AZS solid waste, sodium hydroxide and flux borax in a weight ratio of 1:0.9:1, and bake at a temperature of 750°C for 60 minutes to obtain a sintered material. The zirconia and trioxide in the AZS solid waste Dialuminum and silicon dioxide are converted into sodium zirconate, sodium metaaluminate and sodium metasilicate respectively;

[0050] (2) Separation by water immersion:

[0051] Add water to the sintered material obtained in step (1), the weight ratio of the sintered material to water is 1:4, heat up to 85°C, stir for 45 minutes, and obtain the primary leachate of sodium metasilicate and sodium metaaluminate after filtration, The primary leaching rate is 93%, and the sodium zirconate solid is leached with water for 2-3 times, and the subsequent leaching soluti...

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Abstract

The invention relates to a technology for preparing 4A zeolite from AZS (Al2O3-ZrO2-SiO2) solid waste material, and belongs to the technical field of cyclic utilization of refractory material solid waste materials. The technology comprises firstly performing alkali fusion and sintering on AZS solid waste material to obtain a sintered material, separating zirconium by performing water immersion on the sintered material, so as to obtain a first leachate of metasilicates and meta-aluminates, then adding water glass into the first leachate, and finally successively performing pulpifying and crystallizing to obtain 4A zeolite. The technology solves the problem that added value of a product produced from AZS solid waste material is low, provides a new approach for realizing recovery and utilization of AZS solid waste material by employing a chemical process, 4A zeolite is prepared by directly using AZS solid waste material and performing alkali fusion and sintering for obtaining the sintered material, the silicon-aluminium separation step is avoided, and the technology possesses the characteristics of being simple in production process, low in production cost and free of wastewater discharge.

Description

technical field [0001] The invention relates to a process for preparing 4A zeolite from AZS solid waste, and belongs to the technical field of refractory solid waste recycling. Background technique [0002] The chemical formula of 4A zeolite is: Na 2 O·Al 2 o 3 2SiO2 2 4.5H 2 O, its oxide percentages are: 17%, 28%, 33% and 22%. 4A zeolite is a crystalline sodium aluminosilicate, which is widely used in agriculture, petrochemical industry, environmental protection, seawater potassium extraction, water treatment, polymer chemical industry, cement, food, Cosmetics, paper, electronics and building materials industries, etc. As a high-efficiency desiccant, it can be used to separate, purify, and purify various gases and liquids in petrochemical industry; it can also be used as a catalyst and catalyst carrier to selectively adsorb nitrogen in the air and enrich oxygen; as Ion exchangers can be used for seawater desalination and extraction of rare elements; they can be used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14
Inventor 鲍猛王光强李玉芝刘学燕高延峰
Owner SHANDONG LEIBAO ZIRCONIUM SCI&TECH
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