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Load type arsenic adsorbent, preparation method and application thereof, and arsenic removal method

Inactive Publication Date: 2018-09-07
CHINA SHENHUA ENERGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the composite material prepared by this method has good arsenic adsorption capacity in water, its preparation process is cumbersome, and its adsorption effect is highly dependent on manganese, and when used for the adsorption of arsenic in the gas phase, the adsorption capacity and the adsorption effect will be greatly reduced, and satisfactory results cannot be achieved.

Method used

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  • Load type arsenic adsorbent, preparation method and application thereof, and arsenic removal method
  • Load type arsenic adsorbent, preparation method and application thereof, and arsenic removal method
  • Load type arsenic adsorbent, preparation method and application thereof, and arsenic removal method

Examples

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preparation example Construction

[0027] According to a second aspect of the present invention, a method for preparing a loaded arsenic adsorbent is provided, the method comprising:

[0028] (1) impregnating the alumina carrier in a mixed solution containing ferric salt and an organic acid, the conditions of impregnation are such that the ferric salt is loaded on the alumina carrier to obtain a precursor of a loaded arsenic adsorbent;

[0029] (2) drying and calcining the precursor of the loaded arsenic adsorbent to obtain the loaded arsenic adsorbent.

[0030] According to the present invention, the ferric salt may be various ferric salts conventionally used in the prior art, for example, it may be one or more of ferric chloride, ferric nitrate and ferric sulfate.

[0031] According to the present invention, preferably, the alumina carrier is γ-Al 2 o 3 , when it is combined with the specific iron salt and preparation steps as described above, the prepared adsorbent can achieve more excellent effects.

[0...

Embodiment 1

[0051] This example is used to illustrate the preparation method of the loaded arsenic adsorbent provided by the present invention

[0052] (1) The particle size is 26-32 mesh γ-Al 2 o 3 Place in ethanol solution for shaking, take out 175°C hot air after 30min and dry for 30min, after the temperature drops to room temperature (usually 20-40°C), put γ-Al 2 o 3 Place in ethanol solution for shaking washing. Repeat this step 3 times.

[0053] (2) Prepare 50wt.% ferric nitrate solution, weigh a certain mass of citric acid according to the mass ratio of ferric nitrate and citric acid as 1:0.05, and pour it into the solution. Weigh 30g of γ-Al after step (1) treatment 2 o 3 The carrier was poured into 80 mL of ferric nitrate solution added with citric acid to obtain a mixture.

[0054] (3) Place the mixed solution in step (2) in an ultrasonic oscillator for ultrasonic impregnation, set the water temperature of the ultrasonic oscillator to 50° C., and take it out after 4 hours...

Embodiment 2

[0057] This example is used to illustrate the preparation method of the loaded arsenic adsorbent provided by the present invention

[0058] (1) The particle size is 60-70 mesh γ-Al 2 o 3 Place in ethanol solution for shaking, take out 175°C hot air after 30min and dry for 30min, after the temperature drops to room temperature (usually 20-40°C), put γ-Al 2 o 3 Place in ethanol solution for shaking washing. Repeat this step 3 times.

[0059] (2) Prepare a 10wt.% ferric chloride solution, weigh a certain mass of oxalic acid according to the mass ratio of ferric nitrate and oxalic acid as 1:0.01, and pour it into the solution. Weigh 30g of γ-Al after step (1) treatment 2 o 3 The carrier was poured into 80 mL of ferric chloride solution added with oxalic acid to obtain a mixture.

[0060] (3) Place the mixed solution in step (2) in an ultrasonic oscillator for ultrasonic impregnation, set the water temperature of the ultrasonic oscillator to 60° C., and take it out after 3 h...

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Abstract

The invention relates to a load type arsenic adsorbent, a preparation method and application thereof, and an arsenic removal method. The adsorbent contains an aluminium oxide carrier and an iron element loaded on the aluminium oxide carrier. The load type arsenic adsorbent contains the aluminium oxide carrier and the iron element loaded on the aluminium oxide carrier. In the load type arsenic adsorbent, the 2[Theta] maximum peak intensity of the X ray characteristic peak of the iron element is 33.5 degrees; the dry basis weight of the load type arsenic adsorbent is taken as a standard, and thecontent of the iron element which is metered in terms of oxide is 10w% or below. The preparation method comprises the following steps: carrying out impregnation on the aluminium oxide carrier in mixed liquid containing ferric iron salt and organic acid, loading the ferric iron salt on the aluminium oxide carrier to obtain a load type arsenic adsorbent precursor, and drying and roasting. The arsenic removal method comprises the following steps: enabling the adsorbent to be in contact with the arsenic to remove the arsenic. According to the load type arsenic adsorbent, arsenic can be efficiently gathered, and especially, gaseous phase arsenic is suitable for arsenic removal processing for arsenic-contained smoke.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a loaded arsenic adsorbent and a preparation method thereof, as well as the application of the loaded arsenic adsorbent in arsenic removal and the arsenic removal method. Background technique [0002] Arsenic is one of the most common and harmful substances that cause human cancer in the environment. All arsenic compounds are toxic. At present, the atmospheric emission of industrial arsenic is about 195t / year, and with the intensification of human activities, the emission growing year by year. With people's increasing emphasis on environmental protection and stricter environmental laws and regulations, the emission control of heavy metal arsenic in industrial flue gas has attracted widespread attention at home and abroad. On December 21, 2011, the US Environmental Protection Agency officially released the first national Restricting Toxic Gas Emissions from Power Plants" n...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/32B01D53/02
CPCB01D53/02B01D2257/60B01D2258/0283B01J20/0229B01J20/08B01J20/3204B01J20/3214B01J20/3234
Inventor 蒋丛进张锴刘秋生黄明
Owner CHINA SHENHUA ENERGY CO LTD
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