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Y type molecular sieve prepared from white clay served as raw material and method thereof

A technology of molecular sieve and lime mud, which is applied in the direction of octahedral crystalline aluminosilicate zeolite and crystalline aluminosilicate zeolite, can solve the problems of environmental pollution and large emissions, and achieve simple preparation process, single crystal phase, and easy industrialization The effect of production

Inactive Publication Date: 2019-03-29
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After this method extracts alumina, a large amount of high-silicon tailings (hereinafter referred to as white mud) will be produced. Fly ash can produce 1 ton of metallurgical grade alumina, and discharge 1.3 tons of white mud at the same time, which is a large amount of discharge and pollutes the environment

Method used

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  • Y type molecular sieve prepared from white clay served as raw material and method thereof
  • Y type molecular sieve prepared from white clay served as raw material and method thereof
  • Y type molecular sieve prepared from white clay served as raw material and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 1) Add 40.0 g of anhydrous sodium carbonate solid to 20.0 g of lime mud, mix evenly, and calcinate at 850°C for 2 hours to obtain alkali fusion clinker;

[0060] 2) After the above-mentioned alkali fusion clinker is cooled to room temperature, add 300ml of deionized water and 40ml of directing agent to mix, so that the whole system has 16.1Na 2 O: Al 2 o 3 :10SiO2 2 :715H 2 The material molar ratio of O, after stirring for 5h, silica-alumina gel is obtained;

[0061] 3) Aging the silica-alumina gel obtained above at a temperature of 20°C for 48h, placing it in a crystallization tank at 85°C for 24h, cooling and filtering to remove the mother liquor, washing with deionized water until neutral Dry at 100°C to obtain Y-type molecular sieve.

[0062] After testing, the XRD spectrum of the Y-type molecular sieve gained in Example 1 is shown in figure 1 , SEM photo see figure 2 , nitrogen isotherm adsorption-desorption curve see Figure 5 , the pore size distribution...

Embodiment 2

[0064] 1) Add 26.0 g of sodium hydroxide solid to 20.0 g of lime mud, mix well, and calcinate at 650°C for 3 hours to obtain alkali fusion clinker;

[0065] 2) After the above-mentioned alkali fusion clinker is cooled to room temperature, add 320ml of deionized water and 44ml of directing agent to mix, so that the whole system has 13.9Na 2 O: Al 2 o 3 :10SiO2 2 :763H 2 The material molar ratio of O, after stirring for 3h, silica-alumina gel is obtained;

[0066] 3) Aging the silica-alumina gel obtained above at a temperature of 23°C for 30h, placing it in a crystallization kettle at 90°C for 60h, cooling and filtering to remove the mother liquor, washing with deionized water until neutral Dry at 100°C to obtain Y-type molecular sieve.

[0067] After testing, the XRD spectrum of the obtained Y-type molecular sieve is shown in image 3 .

Embodiment 3

[0069] 1) Add 30.0 g of sodium hydroxide solid to 20.0 g of lime mud, mix well, and calcinate at 780°C for 2.5 hours to obtain alkali fusion clinker;

[0070] 2) After the above-mentioned alkali fusion clinker is cooled to room temperature, add 360ml of deionized water and 46.8ml of directing agent to mix, so that the whole system has 16.0Na 2 O: Al 2 o 3 :10SiO2 2 :800H 2 The material molar ratio of O, after stirring for 4h, silica-alumina gel is obtained;

[0071] 3) Aging the silica-alumina gel obtained above at a temperature of 25°C for 24h, placing it in a crystallization tank at 110°C for 24h, cooling and filtering to remove the mother liquor, washing with deionized water until neutral Dry at 100°C to obtain Y-type molecular sieve.

[0072] After testing, the XRD spectrum of the obtained Y-type molecular sieve is shown in Figure 4 .

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Abstract

The invention discloses a Y type molecular sieve prepared from white clay served as a raw material and a preparation method thereof. The preparation method comprises the following steps: 1) adding analkali solid into white clay, uniformly mixing and calcining, thereby acquiring an alkali fusion clinker; 2) cooling the alkali fusion clinker to room temperature, and then adding water and guiding agent for regulating till the whole system has a material molar ratio of (13.9-16.1)Na2O:Al2O3:(9.5-10.5)SiO2:(600-800)H2O, and then uniformly stirring, thereby acquiring a silica-alumina gel; 3) ageingand crystallizing the silica-alumina gel, and then filtering, cleaning and drying, thereby acquiring the Y type molecular sieve. The method provided by the invention has the advantages of low production cost, simple process, high repeatability and convenience in industrial production.

Description

technical field [0001] The invention belongs to the field of molecular sieve synthesis, and in particular relates to a Y-type molecular sieve prepared from white clay as a raw material and a method thereof. Background technique [0002] Y-type molecular sieve is a kind of crystalline porous inorganic substance with regular pore structure. It is based on β cage and hexagonal column cage to form an octahedral zeolite (FAU) with supercage structure. It is widely used in petroleum catalysis. [0003] At present, the synthesis method of Y-type molecular sieve mainly uses chemical raw materials, but its disadvantages are high energy consumption and high cost in the production process, which also seriously restricts the application of Y-type molecular sieve in various fields. Fly ash is a solid waste in the process of generating electricity in thermal power plants, and its emissions are increasing day by day, causing serious pollution. Among the methods of extracting alumina from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
CPCC01B39/24C01P2002/72C01P2004/03C01P2006/17
Inventor 陈东戴崟王永旺杜艳霞陈雷李超郭昭华徐会军贾敏王强邹萍高桂梅
Owner CHINA SHENHUA ENERGY CO LTD
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