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Process for synthesis of analcime from red mud by hydrothermal alkaline method

An analcime and synthesis method technology, applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of large stockpiles of red mud, and achieve cheap and easy-to-obtain materials, convenient operation, and simple procedures Effect

Inactive Publication Date: 2020-02-11
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the fact that the stock of red mud in our country is huge and cannot be effectively treated and the deficiency of the existing analcime synthesis technology, the present invention provides analcime synthesized by using waste red mud and its process method

Method used

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  • Process for synthesis of analcime from red mud by hydrothermal alkaline method
  • Process for synthesis of analcime from red mud by hydrothermal alkaline method
  • Process for synthesis of analcime from red mud by hydrothermal alkaline method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Take 10.0g of red mud powder, 5.2g of sodium hydroxide, and 6.4g of quartz in 100mL of distilled water, and stir for 12h. After standing still for 12 hours, the materials were put into a closed reaction kettle and crystallized at 180°C for 24 hours. The obtained product was washed twice with acidic water having a pH of 2, and then washed four times with deionized water until neutral. Clean the product with ultrasonic waves, extract the bottom sediment and dry it at 70°C for 15 hours, and its XRD spectrum is as follows figure 1 As shown, its SEM spectrum is shown as figure 2 As shown, the crystallinity of the product is good, and the main crystal form is analcime, containing a small amount of iron oxide impurities.

Embodiment 2

[0031] Take 10.0g of red mud powder, 8.1g of sodium hydroxide, and 6.4g of quartz in 100mL of distilled water, and stir for 24h. After standing still for 9 hours, the materials were put into a closed reaction kettle and crystallized at 180°C for 15 hours. The obtained product was washed twice with acidic water having a pH of 2, and then washed four times with deionized water until neutral. The product was dried at 70°C for 15 hours without ultrasonic treatment, and its XRD pattern was as follows: image 3 shown.

Embodiment 3

[0033] Take 10.0g of red mud powder, 5.2g of sodium hydroxide, and 6.4g of quartz in 100mL of distilled water, and stir for 12h. After standing still for 12 hours, the material was put into a closed reaction kettle and crystallized at 180°C for 9 hours. The obtained product was washed twice with acidic water having a pH of 2, and then washed four times with deionized water until neutral. The product was dried at 70°C for 15 hours without ultrasonic treatment, and its XRD pattern was as follows: Figure 4 shown.

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Abstract

The invention discloses a process for synthesis of analcime from red mud by hydrothermal alkaline method. The crystal form is analcime, and the morphology is spherical. The synthesis method of analcime includes: mixing red mud containing an aluminum source and part of a silicon source, inorganic alkali, an additional silicon source and water uniformly according to a certain material ratio to obtain mixed gel, then carrying out aging and crystallization treatment, and finally conducting washing and drying to obtain a product containing analcime and a small amount of ferric oxide. The analcime provided by the invention is good in crystal form, and the preparation method is simple and feasible.

Description

technical field [0001] The invention relates to the field of solid waste treatment and synthesis of porous inorganic materials, in particular to a process for synthesizing analcime by using red mud from industrial waste and its application. Background technique [0002] Red mud is the alkaline waste slag discharged when the aluminum industry extracts alumina, which is red because it contains iron oxide. The pH value of its solid matter is 10.3-11.8, and the pH value of the leachate is 12.1-13.0. The alkali, fluoride and aluminum contained in the red mud and its attached liquid all exceed the discharge standard stipulated by the Chinese state "Standards for the Control of Pollution by Solid Waste in the Non-ferrous Metal Industry" (GB5058-85). At present, a large amount of red mud cannot be fully and effectively reused, and it is piled up in the open-air dam storage site, which not only occupies a large amount of land, but also its harmful chemical components will seep into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/46
CPCC01B39/46C01P2004/32C01P2004/61C01P2002/72C01P2004/03
Inventor 陈洪杨大仲
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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