Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves

A molecular sieve and tailings technology, which is applied to the removal of solid waste, A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of high raw material cost and expensive price, and achieve good recovery effect and good The effect of reusable performance and reducing the time of hydrolysis

Inactive Publication Date: 2016-01-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The raw materials for synthesizing 4A molecular sieves in the industry are mostly chemically pure sodium silicate and aluminum hydroxide, which are expensive and the cost of raw materials is high

Method used

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  • Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves
  • Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves
  • Method for preparing 4A molecular sieves by using tailings and application of 4A molecular sieves

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw material is tailings, mainly containing SiO2, Al2O3, a small amount of elements such as Fe, K, Ca, Mg, Ti, P, Zn, the main chemical composition is as follows (%wt):

[0026]

[0027] Synthesis of 4A molecular sieve steps using tailings:

[0028] High-temperature alkali fusion: The tailings are ground to 325 mesh, mixed with a certain amount of solid Na2CO3 and solid Al(OH)3, placed in a crucible and then heated at high temperature for reaction. The heating temperature is 855°C, heating and holding for 2 hours, the mass ratio of sodium carbonate to silicon dioxide is 1:1.2, and the molar ratio of silicon dioxide to alumina is 2.

[0029] Add water and age: add water to the ore sample after the above steps and age with stirring for 20 hours. The mass ratio of ore to water is 1:8.

[0030] Heating crystallization: the above-mentioned ore samples are placed in a reaction kettle, heated and kept for a certain period of time. The temperature is 100°C and the tim...

Embodiment 2

[0041] The raw material is tailings, mainly containing SiO2, Al2O3, a small amount of elements such as Fe, K, Ca, Mg, Ti, P, Zn, the main chemical composition is as follows (%wt):

[0042]

[0043] Synthesis of 4A molecular sieve steps using tailings:

[0044] High-temperature alkali fusion: The tailings are ground to 325 mesh, mixed with a certain amount of solid Na2CO3 and solid Al(OH)3, placed in a crucible and then heated at high temperature for reaction. The heating temperature is 855°C, heating and holding for 2 hours, the mass ratio of sodium carbonate to silicon dioxide is 1:1.2, and the molar ratio of silicon dioxide to alumina is 2.

[0045] Add water and age: add water to the ore sample after the above steps and age with stirring for 20 hours. The mass ratio of ore to water is 1:8.

[0046]Heating crystallization: the above-mentioned ore samples are placed in a reaction kettle, heated and kept for a certain period of time. The temperature is 100°C and the time...

Embodiment 3

[0057] The raw material is tailings, mainly containing SiO2, Al2O3, a small amount of elements such as Fe, K, Ca, Mg, Ti, P, Zn, the main chemical composition is as follows (%wt):

[0058]

[0059] Synthesis of 4A molecular sieve steps using tailings:

[0060] High-temperature alkali fusion: The tailings are ground to 325 mesh, mixed with a certain amount of solid Na2CO3 and solid Al(OH)3, placed in a crucible and then heated at high temperature for reaction. The heating temperature is 855°C, heating and holding for 2 hours, the mass ratio of sodium carbonate to silicon dioxide is 1:1.2, and the molar ratio of silicon dioxide to alumina is 2.

[0061] Add water and age: add water to the ore sample after the above steps and age with stirring for 20 hours. The mass ratio of ore to water is 1:8.

[0062] Heating crystallization: the above-mentioned ore samples are placed in a reaction kettle, heated and kept for a certain period of time. The temperature is 100°C and the tim...

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Abstract

The invention belongs to the field of silicate compounds and particularly relates to a method for preparing 4A molecular sieves by using tailings and an application of the 4A molecular sieves. The method comprises 4A molecular sieve synthesis steps as follows: high temperature alkali fusion of sodium carbonate, water addition for ageing, heating for crystallization as well as washing and drying. Al(OH)3 is added before high temperature alkali fusion, and a raw material NaAlSiO4 required by synthesis of the molecular sieves can be generated during alkali fusion. The synthesized molecular sieves are used for treating lead containing wastewater, the optimal pH ranges from 4 to 8, the treatment time is within 10 s, the treatment effect reaches the national emission standard, and the adsorption capacity ranges from 150 mg / g to 200 mg / g. The molecular sieve recovery effects are as follows: more than 70% of the molecular sieves are recovered for the first time, and more than 93% of the molecular sieves are recovered for the second time and the third time. The method for preparing the 4A molecular sieves by using the tailings and the application of the 4A molecular sieves have the benefits as follows: according to the method, the molecular sieves are synthesized by using the high-silicon tailings, the wastewater is treated, environmental problems caused by the tailings are solved, the heavy metal wastewater can also be treated, and the purpose of waste control by waste is achieved.

Description

technical field [0001] The invention belongs to the field of silicate compounds, and relates to a method for preparing 4A molecular sieves from tailings and an application thereof. Background technique [0002] 4A molecular sieve is a cubic crystalline alkali metal aluminosilicate, which is a porous material with channels and cavities formed by connecting silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons through oxygen bridges. This special skeleton structure is often negatively charged, and metal cations are balanced charges, which are distributed in the pores and cages of the skeleton structure and have greater mobility. In the solution, cation exchange can be performed to reduce the content of harmful heavy metals in water. In the lead smelting industry, a large amount of lead-containing wastewater is often produced. Lead-containing wastewater has the hazards of teratogenicity, carcinogenesis and carcinogenicity. Using molecular sieves to treat lead-containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14B09B3/00
Inventor 李素芹曹丹丹熊国宏
Owner UNIV OF SCI & TECH BEIJING
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