Method for preparing sodalite and ZSM-5 molecular sieve from fly ash acid process aluminum extraction residue and fly ash utilization method

A technology for extracting aluminum residue and ZSM-5, which is applied in the directions of borocarbonane silicone crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, alumina/aluminum hydroxide, etc., to achieve considerable environmental benefits and efficient resource utilization Effect

Active Publication Date: 2017-04-26
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the problems of how to improve the absorption efficiency of fly ash acidification aluminum extraction residue by preparing molecular sieves, co-produce high-silicon and low-silicon molecular sieves, and how to use fly ash to provide a fly ash Method for preparing sodalite and ZSM-5 molecular sieve from residue of aluminum extraction by acid method and utilization method of fly ash

Method used

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  • Method for preparing sodalite and ZSM-5 molecular sieve from fly ash acid process aluminum extraction residue and fly ash utilization method
  • Method for preparing sodalite and ZSM-5 molecular sieve from fly ash acid process aluminum extraction residue and fly ash utilization method
  • Method for preparing sodalite and ZSM-5 molecular sieve from fly ash acid process aluminum extraction residue and fly ash utilization method

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Effect test

preparation example

[0077] This preparation example illustrates the preparation of fly ash to obtain the aluminum extraction residue of fly ash acid method.

[0078] Take 100g of fly ash, add 5mol / L hydrochloric acid solution, stir and react at 150°C for 30min, filter and wash to obtain aluminum-rich solution and fly ash acid extraction aluminum residue. The chemical composition of the fly ash acid extraction aluminum residue is shown in Table 2.

Embodiment 1

[0080] (1) Add 50g of fly ash acid extraction aluminum residue to Na 2 CO 3 60g of solid powder, mixed and ground, roasted at 860°C for 90 minutes, cooled rapidly in air after the roasting, and crushed to below about 200 mesh to obtain roasted slag;

[0081] (2) After the roasted slag material is subjected to dry magnetic separation to remove iron, take 70g and add 140ml of deionized water (the amount of water is 200ml relative to 100g of roasted slag material) and carry out water immersion at 100°C and normal pressure for 20min, Leaching and dissolution of Na in the roasted slag 2 SiO 3 and NaAlSiO 4 , to obtain a solid-liquid mixed water immersion product; where the solid is dissolved Na 2 SiO 3 and NaAlSiO 4 The remaining product after; the liquid is containing Na 2 SiO 3 and NaAlSiO 4 The solution;

[0082] (3) Add sodium carbonate solution (recycle the second filtrate from step (6), concentration 15% by weight) 500ml in water immersion product 100g (convert to c...

Embodiment 2

[0091] (1) Add 50g of fly ash acid extraction aluminum residue to Na 2 CO 3 65g of solid powder, mixed and ground, roasted at 890°C for 100min, after the roasting was finished, quickly air-cooled, and crushed to about 180 mesh or less to obtain roasted slag;

[0092] (2) After the roasted slag material is subjected to dry magnetic separation to remove iron, take 70g and add 105ml of deionized water (the amount of water is 150ml relative to 100g of roasted slag material) and carry out water immersion at 95°C and normal pressure for 18min, Leaching and dissolution of Na in the roasted slag 2 SiO 3 and NaAlSiO 4 , to obtain a solid-liquid mixed water immersion product; where the solid is dissolved Na 2 SiO 3 and NaAlSiO 4 The remaining product after; the liquid is containing Na 2 SiO 3and NaAlSiO 4 The solution;

[0093] (3) add sodium carbonate solution (the second filtrate from step (6), concentration 20% by weight) 600ml is added in water immersion product 93g (conve...

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Abstract

The invention relates to the field of fly ash acid process aluminum extraction residue or fly ash utilization, and discloses a method for preparing sodalite and a ZSM-5 molecular sieve from fly ash acid process aluminum extraction residue and a fly ash utilization method. The method comprises the following steps of (1) performing alkaline process roasting on the fly ash acid process aluminum extraction residue to obtain roasting residue materials; (2) performing high-temperature water soaking dissolution reaction on the roasting residue materials to obtain a water soaking product; (3) preparing the water soaking product into sodalite synthesis mother liquid, and performing sodalite hydrothermal crystallization on the sodalite synthesis mother liquid to obtain sodalite powder and first filter liquid; and (4) performing ZSM-5 molecular sieve hydrothermal crystallization on the first filter liquid to obtain the ZSM-5 molecular sieve and second filter liquid. The goals of utilizing the fly ash acid process aluminum extraction residue, improving the utilization rate of the fly ash acid process aluminum extraction residue and utilizing the fly ash are achieved.

Description

technical field [0001] The present invention relates to the fields of fly ash acid extraction aluminum residue and fly ash utilization, in particular to a method for preparing sodalite and ZSM-5 molecular sieve from fly ash acid extraction aluminum residue and a method for utilizing fly ash . Background technique [0002] High-alumina fly ash is a new type of aluminum resource unique to my country, and its prospective resource is about 10 billion tons of alumina. However, the proven bauxite resource reserves in my country are only 3.2 billion tons. According to the current mining scale estimation, the resource guarantee period is only about 20 years, and the current foreign dependence of aluminum resources is as high as 55%. Therefore, the development and utilization of high-alumina fly ash has practical significance for alleviating the shortage of bauxite resources in my country, ensuring the safety of my country's aluminum industry and enhancing the sustainable developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38C01B39/40C01B39/02C01F7/02
CPCC01B39/02C01B39/38C01B39/40C01F7/02
Inventor 刘汇东孙琦王宝冬徐文强张中华肖永丰赵利军
Owner CHNA ENERGY INVESTMENT CORP LTD
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