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Method for producing 4A molecular sieve

A production method and molecular sieve technology, which are applied in the directions of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of high impurity content in intermediate products, affecting the whiteness and calcium exchange capacity of molecular sieves in crystallization reaction, etc. To achieve the effect of good glue forming performance, good economic and environmental benefits, and improved utilization

Inactive Publication Date: 2009-06-03
PINGSHUO INDAL
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the technology of producing 4A molecular sieve by using fly ash and its intermediate products in the utilization process is still in the exploration stage of the industry. At present, the bottleneck of this technology lies in the high impurity content of intermediate products, which affects the crystallization reaction and the whiteness of molecular sieves. and calcium exchange capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The crude sodium silicate solution, an intermediate product obtained during the production process of fly ash alkali-dissolved extraction of silica, is pumped into the carbon separation tower, and gas CO is introduced into the carbon separation tower. 2 , to control CO in the carbon separation tower 2 The concentration is about 38%, the flow rate is 25m 3 / h, and keep the pH of the filtrate=11~11.2 for 100min, so that the impurities in the solution are produced in the form of precipitation, and filter to obtain a relatively pure sodium silicate solution, which is used as a silicon source for synthesizing 4A molecular sieve.

[0031]1L of 72.2g / L sodium silicate solution and 1L of 48.4g / L sodium aluminate solution, which were removed by carbon during the production of fly ash, were mixed in the reaction kettle, 70g of industrial caustic soda was added, and stirred at 65°C for 1.5 h to form a gel, raise the temperature to 95° C., stand at constant temperature for 5 hours...

Embodiment 2

[0033] In the fly ash production process, 230.1g of aluminum hydroxide produced by the fly ash alkali method was added to 1L of the 361.0g / L sodium silicate solution that was removed by carbon, mixed and placed in the reaction kettle, and 360g was added Industrial caustic soda and 4.5L deionized water are stirred at 60°C for 2 hours to form a gel, heated to 92°C, kept at a constant temperature for 4.5 hours to crystallize to produce white crystals, filtered with suction, washed to pH = 11, and dried. 4A molecular sieve. After testing, the calcium exchange capacity of the 4A molecular sieve in this example is 318.4mgCaCO 3 / g, the sieving rate through a 1.25mm sieve is not less than 91%.

Embodiment 3

[0035] Add 177g of white carbon black produced from fly ash to 1L of the 242g / L sodium aluminate solution that has been removed during the production of fly ash, mix evenly and place it in the reaction kettle, add 380g of industrial caustic soda and 5L of Ionized water was stirred at 62°C for 2.5 hours to form a gel, heated to 90°C, and left to crystallize at a constant temperature for 5.5 hours to produce white crystals, filtered by suction, washed to pH = 11, and dried to obtain 4A molecular sieve products. After testing, the calcium exchange capacity of the 4A molecular sieve in this example is 317.2mgCaCO 3 / g, the sieving rate through a 1.25mm sieve is not less than 94%.

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Abstract

A method for producing a 4A molecular sieve comprises the following steps: (a) an intermediate product sodium silicate solution or a product carbon white obtained in the process of extracting silicon dioxide by a fly ash alkali solution method, (b) an intermediate product sodium aluminate solution or products aluminum hydroxide and aluminum oxide obtained in the process of extracting aluminum oxide by a fly ash soda lime sintering method, (c) NaOH and (d). H2O are taken as raw materials which meet the following mol ratios: Na2O:SiO2=1.6-3.8:1 and SiO2:Al2O3=1.7-2.1:1, and water added is controlled at the mol ratio of H2O:Na2O=30-60:1; and the raw materials are evenly mixed, stirred and gelled at 50-80 DEG C, heated to 90-120 DEG C, kept standing and crystallized for 3-6 hours, filtered, washed and dried to obtain the 4A molecular sieve. The calcium exchange capacity of the produced 4A molecular sieve is not less than 310mgCaCO3 / g, and the sieving rate of a 1.25mm sieve is not lower than 90%.

Description

technical field [0001] The invention relates to a production method of 4A molecular sieve, in particular to a method for producing 4A molecular sieve by using the product or intermediate product in the comprehensive utilization process of fly ash as raw materials and adopting a liquid phase synthesis method. Background technique [0002] Molecular sieve is a crystalline aluminosilicate with large specific surface area, high hydrothermal stability, rich and uniform micropores, etc. It has been widely used in chemical industry, petroleum industry and other departments. Due to the lack of natural minerals and the relatively monotonous varieties, natural molecular sieves are far from meeting the requirements of the market. Therefore, sodium aluminate, sodium silicate and clay minerals are generally used as raw materials to synthesize various types of molecular sieves. Scale production and application. [0003] 4A molecular sieve is a three-dimensional skeleton structure crystal...

Claims

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Application Information

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IPC IPC(8): C01B39/14
Inventor 白光辉徐鹏秦晋国张辉滕玮王香港郭继萍廉文君
Owner PINGSHUO INDAL
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