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Method for preparing mordenite by using diatomite

A technology of mordenite and diatomite, which is applied in the production and preparation of inorganic functional materials, can solve the problems of high synthetic cost of chemical reagents, cumbersome process steps, and large discharge of mother liquor, and achieve high reproducibility of reaction and simple process , the effect of saving energy

Inactive Publication Date: 2014-05-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing method for synthesizing mordenite has cumbersome process steps, high cost of synthesis with chemical reagents, large discharge of mother liquor and environmental pollution
Therefore lack a kind of with diatomite as raw material, mix with industrial reagent, adopt the method for the synthetic mordenite of hydrothermal synthesis method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Grind the mordenite, pass it through a 100-mesh sieve, and dry it in an oven at 90°C for 24 hours.

[0015] Its main chemical composition is analyzed by XRF elements as follows:

[0016] chemical composition

SiO 2

Al 2 o 3

Fe 2 o 3

K 2 o

TiO 2

CaO

MgO

Na 2 o

percentage%

79.5

10.5

5.8

1.3

0.9

0.6

0.5

0.3

[0017] The composition of water glass adopted is as follows:

[0018] chemical composition

Na 2 o

SiO 2

h 2 o

percentage%

10.1

28

61.9

[0019] (2) Mole ratio H 2 O / Na 2 O=9.3 Weigh water glass and deionized water, mix them in a stainless steel reactor, and then press Na 2 O / SiO 2 =0.15 Add diatomaceous earth, stir for 0.5h and mix well.

[0020] (3) The above reaction mixture was sealed and placed in a 180°C electric constant temperature drying oven for crystallization for 16 hours.

[0021] (4) Take out...

Embodiment 2

[0023] (1) Grind diatomaceous earth, pass through an 80-mesh sieve, and dry in an oven at 100°C for 12 hours.

[0024] (2) Mole ratio H 2 O / Na 2 O=10.9 Weigh sodium hydroxide and deionized water, mix them in a stainless steel reactor, and then press Na 2 O / SiO 2 =0.26 Add diatomaceous earth, stir for 1h and mix well.

[0025] (3) The above reaction mixture was sealed and placed in an electric constant temperature drying oven at 150°C for crystallization for 22 hours.

[0026] (4) Take out the reaction kettle, after cooling, carry out suction filtration, wash until PH = 7, put it in an oven at 100°C and dry it to obtain mordenite crystal powder.

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Abstract

The invention discloses a method for preparing mordenite by using diatomite and belongs to the field of production and preparation of inorganic functional materials. The method is characterized by comprising the following steps of: firstly determining the content of SiO2 and Al2O3 in a diatomite raw material, screening through a screen, and then drying in a drying box; uniformly mixing the dried diatomite raw material with deionized water and water glass, wherein the proportion of reaction raw materials in the formula is as follows: H2O / Na2O=8-11, Na2O / SiO2=0.05-0.30, SiO2 / Al2O3=12-16; transferringthe material into a reaction kettle, and crystallizing at constant temperature; finally filtering, washing and drying the product to obtain the mordenite. According to the method disclosed by the invention, mordenite is prepared from the low-cost raw material diatomite; few diatomite pretreatment steps are carried out; and the energy source is saved through use of direct hydrothermal method synthesis. The preparation process has the advantages of simple process, easy operation and environmental friendliness.

Description

technical field [0001] The invention belongs to the field of production and preparation of inorganic functional materials, and relates to a method for preparing mordenite by using diatomite and industrial grade water glass as raw materials. Background technique [0002] my country's diatomite reserves are 320 million tons, and the prospective reserves are more than 2 billion tons, accounting for 11.6% of the world's total reserves. The main components of diatomaceous earth include SiO 2 、Al 2 o 3 , Fe 2 o 3 , CaO, MgO and organic matter, among which SiO 2 、Al 2 o 3 accounted for the vast majority of the content. Using diatomite as raw material, the synthesis of zeolite molecular sieves by hydrothermal synthesis is an important way for the deep utilization of diatomite. The current existing method for synthesizing mordenite has cumbersome process steps, high synthesis cost with chemical reagents, large discharge of mother liquor and environmental pollution. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/26
CPCY02P20/10
Inventor 胡涛吕楠孟长功张依福
Owner DALIAN UNIV OF TECH
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