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Red mud adsorbent and preparation method and application thereof

A technology for adsorbent and red mud, applied in the field of red mud adsorbent and its preparation, can solve the problems of high requirements for preparation conditions, high cost of adsorption process, increased cost of adsorption process of polluting elements in water, etc., and achieves the effect of improving adsorption capacity

Active Publication Date: 2019-01-01
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Nowadays, a lot of research has been invested in the adsorption process. Although some progress has been made, the cost of the adsorption process is relatively high at this stage; desorption treatment
For example, Chinese patent CN102139202A discloses a cellulose-based material for the removal of arsenic and fluorine in water, but the preparation process of the adsorbent is complicated, and many types of raw materials are used in the preparation process, and the preparation conditions are relatively high. , have led to an increase in the cost of the adsorption process of pollutant elements in water

Method used

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  • Red mud adsorbent and preparation method and application thereof
  • Red mud adsorbent and preparation method and application thereof
  • Red mud adsorbent and preparation method and application thereof

Examples

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preparation example Construction

[0027] The invention provides a kind of preparation method of red mud adsorbent, comprises the following steps:

[0028] (1) Using seawater to wash and modify the red mud to obtain seawater modified red mud;

[0029] (2) Mix the seawater modified red mud obtained in the step (1) with ferric chloride solution, and heat and modify the obtained mixed solution to obtain the red mud adsorbent.

[0030] The invention uses seawater to wash and modify the red mud to obtain seawater modified red mud. In the present invention, the seawater preferably includes the following concentration of cations: Ca 2+ 350~650ppm, K + 300~700ppm, Li + 0.03~0.19ppm, Mg 2+ 630~1400ppm, Na + 10000~40000ppm and Sr 2+ 6-10ppm; TP (that is, the total content of organic phosphorus, phosphate and phosphite) in the seawater is preferably 0.06-0.14ppm; the anions contained in the seawater preferably include HCO 3 - and Br - ; The present invention has no special requirements on the content of anions in...

Embodiment 1

[0051] Weighed 10g of alkaline waste residue red mud (abbreviated as RMA, as shown in Table 1) produced by a Bayer aluminum smelting enterprise and crushed it into 60 meshes. Prepare seawater and wash it at 25°C with 250mL of seawater each time. The time for a single seawater wash is half an hour. After the seawater wash is completed, wash with clean water and centrifuge to obtain seawater modified red mud. Then divide the seawater modified red mud into two parts and add 0.5mol / L ferric chloride solution until the pH is 4.0, and react under water bath and stirring conditions at 25°C and 90°C respectively until the pH value of the mixed solution is stable at 4. ~5, and then centrifuged, washed with water and dried in sequence to obtain the red mud adsorbent.

[0052] The red mud adsorbent obtained by reaction at 25°C is represented by RMA-25°C; the red mud adsorbent obtained by reaction at 90°C is represented by RMA-90°C.

[0053] The chemical composition of the alkaline waste...

Embodiment 2

[0061] The alkaline waste residue red mud (abbreviated as RMB, and the specific element composition is shown in Table 1) produced by an aluminum smelting enterprise using the Bayer process was weighed, and other conditions were the same as in Example 1. The red mud adsorbent obtained by reacting at 25°C is represented by RMB-25°C; the red mud adsorbent obtained by reacting at 90°C is represented by RMB-90°C.

[0062] The obtained red mud is continuously leached, and the obtained results are as follows: figure 2 And as shown in Table 2.

[0063] The red mud adsorbent obtained in this embodiment and the raw red mud are subjected to X-ray diffraction analysis, such as image 3 and Figure 5 As shown, the same conclusion as in Example 1 can be obtained.

[0064] In order to verify the effect of seawater adsorption modification, XRD analysis was carried out on the red mud raw materials of Example 1 and Example 2 and the red mud after seawater washing and modification respective...

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Abstract

The invention belongs to the technical field of water treatment, and particularly provides a red mud adsorbent and a preparation method and application thereof. According to the red mud absorbent, with alkaline red mud as a material, part of free alkali in the red mud is removed by the effect of washing and precipitation in the process of seawater washing modification, the red mud is then modifiedby a ferric chloride solution, so that the content of iron oxide with an adsorbing effect in the red mud is increased, and thereby the adsorbing capability is increased. According to the red mud absorbent, the preparation cost is low, and the obtained red mud adsorbent has good adsorbing capability on arsenic and fluorine; moreover, after adsorption is completed, the red mud adsorbent can be directly piled up, and subsequent desorption is not needed.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a red mud adsorbent and a preparation method and application thereof. Background technique [0002] With the improvement of living standards and the development of industrial standards, the problem of arsenic and fluorine pollution in groundwater is prominent. Among them, the combined pollution of arsenic and fluorine is more common, and the joint poisoning of arsenic and fluorine occurs frequently, which poses a threat to water quality safety and human health. . [0003] At present, the main removal methods for arsenic and fluorine pollution in water are: electrocoagulation, chemical agent flocculation, membrane filtration and adsorption; among them, adsorption has attracted wide attention due to its cleaning advantages. The adsorption process includes the preparation of adsorption materials, adsorption and adsorbent treatment after adsorption; the three asp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F101/10C02F101/14
CPCB01J20/0229B01J20/027B01J20/06C02F1/281C02F2101/103C02F2101/14
Inventor 王洪涛李风亭张路亓雪娇
Owner TONGJI UNIV
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