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A kind of method that clay prepares nax type zeolite molecular sieve pure phase

A technology of zeolite molecular sieve and clay, which is applied in the field of synthesizing NaX zeolite molecular sieve, can solve the problems of no clay and synthesis of NaX zeolite molecular sieve, etc., and achieve the effects of reduced consumption, low cost and abundant raw material sources

Inactive Publication Date: 2015-11-25
DALIAN BEIDI SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although there are many studies and reports on the synthesis of zeolite molecular sieves using cheap soil as raw materials, there is no report on the synthesis of NaX-type zeolite molecular sieves from clay.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Crush the clay and pass through a 100-mesh sieve. Dry in an oven at 90°C for 24 hours.

[0017] The XRF elemental analysis results of its chemical composition are as follows:

[0018] chemical composition SiO 2 al 2 o 3 K 2 o Fe 2 o 3 TiO 2 MgO percentage% 60.87 15.24 13.80 7.01 1.24 0.78

[0019] (2) The reaction raw materials according to SiO 2 / Al 2 o 3 =2, Na 2 O / SiO 2 =1,H 2 O / Na 2 O=15 for the reaction.

[0020] (3) Alkali-melting process, mixing the clay and sodium carbonate uniformly according to the above ratio, calcining at a temperature of 650° C. for 1 hour, and grinding the calcined clinker for later use.

[0021] (4) During the hydrothermal synthesis process, the sodium metaaluminate, water and the above clinker were stirred and mixed according to the above ratio to form a colloid, stirred and aged at room temperature for 0.5 hours, and then crystallized ...

Embodiment 2

[0024] (1) Crush the clay and pass through a 100-mesh sieve. Dry in an oven at 90°C for 24 hours.

[0025] (2) The reaction raw materials according to SiO 2 / Al 2 o 3 =3, Na 2 O / SiO 2 =3,H 2 O / Na 2 O=45 for the reaction.

[0026] (3) Alkali-melting process, mixing the clay and sodium carbonate uniformly according to the above ratio, calcining at 800°C for 2.5 hours, and grinding the calcined clinker for later use.

[0027] (4) During the hydrothermal synthesis process, sodium metaaluminate, water and the above-mentioned clinker were stirred and mixed according to the above ratio to form a colloid, stirred and aged at room temperature for 1 hour, and then crystallized at a temperature of 95°C for 10 Hour.

[0028] (5) The product was filtered, washed to pH=7~11, and dried to obtain the pure phase of NaX zeolite molecular sieve. The static saturated water adsorption capacity of the molecular sieve was measured by the national standard method (GB6287-86) to be 34%.

Embodiment 3

[0030] (1) Crush the clay and pass through a 100-mesh sieve. Dry in an oven at 90°C for 24 hours.

[0031] (2) The reaction raw materials according to SiO 2 / Al 2 o 3 =4.5, Na 2 O / SiO 2 =4.5,H 2 O / Na 2 O=60 for the reaction.

[0032] (3) Alkali-melting process, mixing the clay and sodium carbonate uniformly according to the above ratio, calcining at 900°C for 4 hours, and grinding the calcined clinker for later use.

[0033] (4) During the hydrothermal synthesis process, the sodium metaaluminate, water and the above clinker were stirred and mixed according to the above ratio to form a colloid, stirred and aged at room temperature for 2 hours, and then crystallized at a temperature of 110°C for 20 Hour.

[0034] (5) The product was filtered, washed to pH=7~11, and dried to obtain the pure phase of NaX zeolite molecular sieve. The static saturated water adsorption capacity of the molecular sieve was measured by the national standard method (GB6287-86) to be 32%.

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Abstract

The invention belongs to a method for preparing a zeolite molecular sieve and relates to a method for preparing a NaX-type zeolite molecular sieve pure phase by using clay. The method comprises the following steps: stirring and mixing clinker prepared by mixing and calcining clay and sodium carbonate with sodium metaaluminate and water into colloid, crystallizing, filtering, washing and filtering to obtain the NaX-type zeolite molecular sieve pure phase. The filtered mother solution is recycled and serves as one part of the raw material. The mother solution is recycled, so that the synthetic cost is reduced, waste discharge is avoided, and the environment is not polluted. The method has obvious advantages in aspects of preparation cost, product performance, process flow, environment friendliness and economic profits, and the raw material source is rich, the cost is low, the synthesis simple and convenient, the equipment requirement is low, the product performance is high and the industrial production potential is high.

Description

technical field [0001] The invention belongs to the fields of mineral processing technology and zeolite molecular sieve preparation. Specifically, it relates to a method for synthesizing NaX type zeolite molecular sieve with clay as raw material. Background technique [0002] At present, the preparation method of artificial zeolite molecular sieve is mainly synthesized by traditional hydrothermal method using chemical reagents as raw materials. Although its synthesis technology is quite mature, its cost is relatively high. Clay is a common aggregate of clay minerals, the main components of which include SiO 2 、Al 2 o 3 、K 2 O, Fe 2 o 3 and MgO etc., where SiO 2 、Al 2 o 3 Accounting for the vast majority of the content, it can replace water glass and sodium aluminate in chemical raw materials, greatly reducing the cost, thus becoming an ideal synthetic raw material for zeolite molecular sieves. Clay is an advantageous mineral in our country, with a large total reser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18C01B39/22
Inventor 张新林
Owner DALIAN BEIDI SCI & TECH
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