Preparation method, regeneration method and application of carbonized modified red mud ceramsite adsorbent

A technology of red mud ceramsite and adsorbent, which is applied in the direction of chemical instruments and methods, separation methods, filter regeneration, etc., can solve the problems of insufficient adsorption performance of red mud ceramsite, achieve good carbonization effect, enhance adsorption performance, reduce The effect of sodium-alkali content

Active Publication Date: 2020-10-30
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ceramsite is a well-developed new building material at present. Because its internal structure is characterized by fine and dense honeycomb micropores, light weight, high strength, and good adsorption, the preparation of ceramsite from red mud is a current research hotspot in red mud treatment. However, In the case of unmodified, the adsorption performance of red mud ceramsite still has some deficiencies.

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  • Preparation method, regeneration method and application of carbonized modified red mud ceramsite adsorbent
  • Preparation method, regeneration method and application of carbonized modified red mud ceramsite adsorbent

Examples

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no. 1 example

[0025] A kind of preparation of carbonized modified red mud ceramsite adsorbent comprises the following steps:

[0026] (1) Prepare Bayer process red mud into ceramsite with a particle size of about 1-1.5 cm, place it in an oven, and dry it at 100°C for 12 hours;

[0027] (2) Put the dried red mud ceramsite in a carbonization kettle, and use carbon dioxide with a purity of 99.9% as carbonization gas. The pressure in the carbonization kettle is 1 MPa, the humidity is 30%, the temperature is 50 ° C, and the time is 2 hours; after the carbonization is completed Then dry at 100°C for 12 hours to obtain modified red mud ceramsite.

no. 2 example

[0029] A kind of preparation of carbonized modified red mud ceramsite adsorbent comprises the following steps:

[0030] (1) Prepare Bayer red mud into ceramsite with a particle size of about 1-1.5 cm, place it in an oven, and dry it at 120 ° C for 10 h;

[0031] (2) Place the dried red mud ceramsite in a carbonization kettle, and use carbon dioxide with a purity of 99.9% as carbonization gas. The pressure in the carbonization kettle is 1MPa, the humidity is 60%, the temperature is 100°C, and the time is 2h; after the carbonization is completed Then dry at 120°C for 10 hours to obtain modified red mud ceramsite.

no. 3 example

[0033] A kind of preparation of carbonized modified red mud ceramsite adsorbent comprises the following steps:

[0034] (1) Prepare Bayer process red mud into ceramsite with a particle size of about 1-1.5 cm, place it in an oven, and dry it at 110°C for 12 hours;

[0035] (2) Place the dried red mud ceramsite in a carbonization kettle, and use carbon dioxide with a purity of 99.9% as the carbonization gas. The pressure in the carbonization kettle is 2MPa, the humidity is 60%, the temperature is 50°C, and the time is 4h; after the carbonization is completed Then dry at 110°C for 12 hours to obtain modified red mud ceramsite.

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Abstract

The invention relates to the technical field of red mud ceramsite adsorbents, in particular to a preparation method, a regeneration method and application of a carbonized modified red mud ceramsite adsorbent. The preparation method comprises the following steps of: drying red mud ceramsite, then carrying out carbonization treatment under the conditions of set temperature, humidity and pressure, and drying again after the carbonization treatment is finished, thus obtaining the red mud ceramsite adsorbent. The regeneration method comprises the following steps of: after sewage is treated by the carbonized modified red mud ceramsite adsorbent, mixing the adsorbent, calcium oxide and water, carrying out calcification reaction on the adsorbent under a stirring condition, filtering out the adsorbent, washing the adsorbent with clear water, carrying out carbonization treatment under set temperature, humidity and pressure conditions, and drying again to obtain the carbonized modified red mud ceramsite adsorbent. The red mud ceramsite is carbonized and modified, so that the adsorption performance of the ceramsite can be remarkably improved. In addition, the regeneration of the red mud ceramsite adsorbent can be effectively realized by adopting a regeneration method of calcification and carbonization treatment in sequence, so that the adsorbent can be repeatedly utilized.

Description

technical field [0001] The invention relates to the technical field of red mud ceramsite adsorbent, in particular to a preparation method of carbonized modified red mud ceramsite adsorbent, a regeneration method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Red mud is industrial solid waste from industrial aluminum production. Generally, for every ton of alumina produced, 1 to 1.5 tons of red mud is incidentally produced. According to incomplete statistics, the annual discharge of red mud in my country is as high as tens of millions of tons, and the cumulative storage of more than tens of millions of tons has been accumulated. The utilization r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/34B01J20/30C02F101/20C02F101/30
CPCB01J20/041B01J20/06B01J20/08B01J20/103B01J20/34B01J20/3475B01J2220/4887C02F2101/20C02F2101/30
Inventor 李召峰王孜健林春金孟祥龙陈晨刘超
Owner SHANDONG UNIV
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