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Method for synthesis of sodalite from kaolinite

A technology of kaolinite and sodalite, which is applied in the direction of aluminum silicate and silicate, can solve the problems of high production cost, complex sodalite synthesis process, and low purity of synthetic sodalite, and achieve low cost, Significant environmental and economic benefits, and the effect of improving the utilization rate of strong alkali

Active Publication Date: 2016-09-28
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the technical deficiencies such as complex sodalite synthesis process, high production cost, and low purity of synthetic sodalite, the present invention proposes a method for synthesizing sodalite by using kaolinite as raw material and adopting normal pressure-alkali dissolution process

Method used

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  • Method for synthesis of sodalite from kaolinite
  • Method for synthesis of sodalite from kaolinite
  • Method for synthesis of sodalite from kaolinite

Examples

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Embodiment 1

[0026] Calcinate kaolinite in a box-type resistance furnace at 750°C for 2 hours to obtain a metakaolinite sample, weigh 5g of metakaolinite each time and place it in a reactor with a stirring device, and mix the prepared 10mol / L The sodium hydroxide solution is added into the reactor while stirring, the solid-liquid ratio is 1:10 (g / ml or kg / L), heated from room temperature to 95°C, and reacted for 8 hours under this condition, and the product synthesized by the reaction is carried out Centrifuge or filter, wash until the pH is 9, and dry at 100°C to obtain the desired product. After recovering the obtained filtrate and washing water, sodium hydroxide caustic soda is added to form a solution of corresponding concentration, which can be recycled.

[0027] figure 1 It is the XRD pattern of the product synthesized in this embodiment, as can be seen from the figure, the peaks appearing at 13.9, 24.3, 31.5, 34.5, 42.6 correspond to the standard cards of sodalite one by one, and i...

Embodiment 2

[0030] Calcinate kaolinite in a box-type resistance furnace at 750°C for 2 hours to obtain a metakaolinite sample. Weigh 5g of metakaolinite each time and place it in a reactor with a stirring device. The prepared 25mol / L The sodium hydroxide solution is added into the reactor while stirring, the solid-to-liquid ratio is 1:2, heated from room temperature to 85°C, and reacted for 8 minutes under this condition, and the product synthesized by the reaction is centrifuged or filtered and washed until the pH is 9. The desired product can be obtained after drying at 100°C.

Embodiment 3

[0032] Calcinate kaolinite in a box-type resistance furnace at 750°C for 2 hours to obtain a metakaolinite sample, weigh 5g of metakaolinite each time and place it in a reactor with a stirring device, and mix the prepared 10mol / L Add sodium hydroxide solution to the reactor while stirring, the solid-to-liquid ratio is 1:10, react at room temperature (25°C) for 120h, centrifuge or filter and wash the product synthesized by the reaction until the pH is 9, after The desired product was obtained after drying at 100°C.

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Abstract

The invention discloses a method for synthesis of sodalite from kaolinite. The method comprises 1, calcining a kaolinite raw material at a high temperature under a certain condition so that the kaolinite is subjected to dehydroxylation to form metakaolin, 2, at the normal temperature, preparing a strong base solution with a certain concentration from deionized water, 3, putting a certain amount of the metakaolin into a reactor with a stirrer, adding the strong base solution into the reactor along with stirring, and uniformly mixing the metakaolin and the strong base solution so that the system undergoes a reaction under a certain condition, and 4, filtering, washing and drying the reaction products to obtain sodalite. The method realizes a low cost, can be carried out at a low temperature, has mild conditions, is free of an organic surfactant and prevents pollution. The method utilizes a normal pressure alkaline dissolution method to directly synthesize sodalite, has simple processes and short time consumption, realizes fast synthesis of sodalite in a few minutes and is suitable for large scale production.

Description

technical field [0001] The invention belongs to the field of development and utilization of inorganic non-metallic materials and non-metallic ores, and in particular relates to a method for synthesizing sodalite by calcining kaolinite and alkali-dissolving. Background technique [0002] Sodalite is a sodium aluminosilicate with a framework structure. Its crystal structure is a body-centered cubic SOD cage connected by a single four- and six-membered ring. It has good large-radius cation occlusion performance and thermal conductivity. stable performance. Photochromic materials can be prepared by adding non-stoichiometric alkali metal salts to stimulate photochromic phenomena; the special cage diameter of sodalite itself makes it selective for hydrogen as a hydrogen storage material, and at the same time It has good anti-oxidation and anti-humidity properties, good stability, and has important application prospects in oxygen adsorption and oxygen storage. [0003] As a very ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
CPCC01B33/26C01P2002/72C01P2004/03
Inventor 匡敬忠
Owner JIANGXI UNIV OF SCI & TECH
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