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Modified red mud and its preparation method and application

A red mud modification technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of small adsorption capacity and large amount of adsorbent dosage

Active Publication Date: 2017-10-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing removal technologies have the problems of large dosage of adsorbent and small adsorption capacity.

Method used

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  • Modified red mud and its preparation method and application
  • Modified red mud and its preparation method and application
  • Modified red mud and its preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0027] The invention provides a method for preparing modified red mud, comprising the following steps:

[0028] Roasting the waste residue red mud to obtain a roasted product;

[0029] The roasted product is acid-leached with sulfuric acid to obtain modified red mud.

[0030] The invention roasts the waste residue red mud to obtain a roasted product. The present invention does not have any special limitation on the source of the waste residue red mud, and the source of the waste residue red mud well-known to those skilled in the art can be used, specifically, the alkaline waste residue red mud produced by the aluminum smelting industry. In the present invention, the waste residue red mud is preferably crushed, and the particle size of the waste residue red mud after crushing is preferably 50-80 mesh, more preferably 60-70 mesh.

[0031] In the present invention, the calcination temperature is preferably 900-1000°C, more preferably 920-950°C; the calcination time is preferabl...

Embodiment 1

[0047] Weigh 10 g of alkaline waste residue red mud produced in the aluminum smelting industry and break it into 60 meshes, and roast it at 900°C for 5 hours to obtain a roasted product, and then use 0.5mol / L sulfuric acid in a water bath and stir the roasted product at 70°C acid leaching for 5 hours, wherein the liquid-solid ratio of roasted product to sulfuric acid was 10:1, and then centrifuged, washed and dried to obtain modified red mud.

[0048] Scanning electron microscope analysis was carried out on the waste residue red mud before and after roasting, and the results were as follows: figure 2 As shown, where a is the scanning electron microscope spectrum of waste residue red mud after roasting, and b is the scanning electron microscope spectrum of waste residue red mud before roasting. figure 2 It can be seen that the surface of the roasted waste red mud presents a porous state.

[0049] Scanning electron microscope analysis was carried out to the product after acid...

Embodiment 2

[0056] Weigh 10 g of alkaline waste red mud produced in the aluminum smelting industry and break it into 100 meshes, and roast it at 1000°C for 2 hours to obtain a roasted product, and then use 0.5mol / L sulfuric acid in a water bath under stirring conditions to heat the roasted product at 80°C Under acid leaching for 3 hours, the liquid-solid ratio of roasted product to sulfuric acid is 10:1, and then centrifuged, washed and dried to obtain modified red mud.

[0057] The modified red mud prepared in Example 2 is used to adsorb arsenic and fluorine of different concentrations in the water body, the amount of modified red mud=5g / L, the results are as follows Figure 6 shown by Figure 6 It can be seen that the removal rate of arsenic and fluorine at different initial concentrations can reach more than 99%. When treating drinking water with low concentration of arsenic and fluorine (arsenic concentration <5mg / L, fluorine concentration <30mg / L), the water quality after adsorption...

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Abstract

The invention provides a preparation method of modified red mud, and belongs to the technical field of water disposal. The modified red mud is prepared by roasting waste slag red mud, acquiring a roasting product and performing acid immersion on the roasting product by sulfuric acid. Through the roasting treatment, the content of impurities in the waste slag red mud can be reduced, and method is good for the reaction of sulfate radical and calcium ion in the subsequent acid immersion process, and can improve the content of effective component CaSO4 (H2O)2 (plaster stone) of a final product; the waste slag red mud surface after roasting is in porous state, thus it is good for the sufficient contact between the waste slag red mud and sulfuric acid, thereby benefiting the formation of the calcium sulfate crystal. Data of an embodiment shows that the removal rate of fluorine in the waste water by the modified red mud is up to 99% above in 1h, and the arsenical removal rate is over 99%, thus the synchronous removal of fluorine and arsenic can be realized; the water quality after absorbing can completely meet the national Hygienic Standard for Drinking Water.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a modified red mud and its preparation method and application. Background technique [0002] The problem of arsenic and fluorine pollution in groundwater in Shanxi, Inner Mongolia, Xinjiang and other places in my country is prominent, and the two pollutants, arsenic and fluorine, often exist together in the form of compound pollution, posing a threat to water quality safety and human health. The concentrations of arsenic and fluorine in shallow groundwater in the Datong Basin can reach 1550 μg / L and 10.4 mg / L, respectively, exceeding the national standards of 10 μg / L for arsenic and 1.0 mg / L for fluorine. [0003] At present, the removal technologies for arsenic and fluorine complex pollution in water mainly include electrocoagulation, flocculation, membrane separation and adsorption. CN 101386433A discloses the reaction of aluminum-iron flocs produced by electrochemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04C02F1/28B01J20/30C02F101/10C02F101/14
CPCB01J20/02B01J20/045C02F1/281C02F2101/103C02F2101/14
Inventor 王洪涛李风亭亓雪娇徐博琳
Owner TONGJI UNIV
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