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Method for preparing nay type molecular sieve and zsm-5 type molecular sieve from fly ash acid extraction residue and utilization method of fly ash

A ZSM-5 technology for extracting aluminum residues, which is applied to octahedral crystalline aluminum silicate zeolite, borocarbane silicone crystalline aluminum silicate zeolite, crystalline aluminosilicate zeolite, etc., achieving considerable environmental benefits and omitting extraction and separation operation and the effect of efficient resource utilization

Active Publication Date: 2018-11-20
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 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 The method of preparing NaY type molecular sieve and ZSM-5 type molecular sieve from the residue of aluminum extraction by acid method and the utilization method of fly ash

Method used

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  • Method for preparing nay type molecular sieve and zsm-5 type molecular sieve from fly ash acid extraction residue and utilization method of fly ash
  • Method for preparing nay type molecular sieve and zsm-5 type molecular sieve from fly ash acid extraction residue and utilization method of fly ash
  • Method for preparing nay type molecular sieve and zsm-5 type molecular sieve from fly ash acid extraction residue and utilization method of fly ash

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Effect test

preparation example 1

[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.

[0079] The chemical composition of the fly ash acid extraction aluminum residue is shown in Table 2.

preparation example 2

[0081] This preparation illustrates the preparation of NaY directing agent.

[0082] Sodium metaaluminate, sodium hydroxide, water glass and deionized water, according to Na 2 O: Al 2 o 3 :SiO2 2 :H 2 The molar mass ratio of O=10.7:1:9.8:215 was mixed and aged at 35° C. for 24 hours to obtain the NaY directing agent.

[0083] SiO in directing agent 2 The content is 152.6g / L.

Embodiment 1

[0085] (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;

[0086] (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 dissolving 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;

[0087] (3) Under high-speed stirring state, get whole water immersion product 100g (convert to containing 70g of calcined slag material), add sodium carbonate solution...

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Abstract

The invention relates to the field of utilization of fly ash acid-process aluminum extraction residues and fly ash and discloses a method for preparing a NaY-type molecular sieve and a ZSM-5 type molecular sieve by use of fly ash acid-process aluminum extraction residues and a utilization method of fly ash. The method comprises the following steps: (1) performing alkaline-process roasting of the fly ash acid-process aluminum extraction residues to obtain roasted slag, and sequentially performing high-temperature water leaching and heat-preserving filtration of the roasted slag to obtain a first filtrate; (2) performing NaY-type molecular sieve hydrothermal crystallization of the first filtrate to obtain a NaY-type molecular sieve and a molecular sieve filtrate; and (3) performing ZSM-5 type molecular sieve hydrothermal crystallization of the molecular sieve filtrate to obtain a ZSM-5 type molecular sieve and a second filtrate. The consumption of the fly ash acid-process aluminum extraction residues is realized, and the utilization rates of the fly ash acid-process aluminum extraction residues and the fly ash are increased.

Description

technical field [0001] The present invention relates to the utilization field of fly ash acid method aluminum extraction residue and fly ash, in particular to a method for preparing NaY type molecular sieve and ZSM-5 type molecular sieve from fly ash acid method aluminum extraction residue and the use of fly ash Use method. 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 enha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24C01B39/38C01B39/40
CPCC01B39/24C01B39/38C01B39/40C01P2002/72
Inventor 刘汇东孙琦王宝冬徐文强张中华肖永丰郭强
Owner CHNA ENERGY INVESTMENT CORP LTD