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Adsorbent for desorption of heavy metal arsenic, and preparation method and application of adsorbent

An adsorbent and heavy metal technology, applied in separation methods, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of inapplicability and limited effect of flue gas dearsenic removal, improve sintering resistance, and enrich surface active sites. , the effect of low price

Pending Publication Date: 2019-12-20
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: In view of the problems that conventional adsorbent materials in the prior art are not suitable for arsenic removal in high-temperature furnaces, and the effect of flue gas removal in high-temperature furnaces is limited, the present invention provides an adsorbent for the removal of heavy metal arsenic, and the The preparation method of the adsorbent also provides an application of the adsorbent for arsenic removal in a high-temperature environment

Method used

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  • Adsorbent for desorption of heavy metal arsenic, and preparation method and application of adsorbent
  • Adsorbent for desorption of heavy metal arsenic, and preparation method and application of adsorbent
  • Adsorbent for desorption of heavy metal arsenic, and preparation method and application of adsorbent

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preparation example Construction

[0023] (2) Preparation of hollow structure iron oxide

[0024] Mix and impregnate the pretreated waste sulfonated polystyrene resin with iron-containing wastewater, and after magnetic stirring for 6-10 hours, filter out the resin, wash and dry; then roast the dried resin at high temperature to obtain hollow iron oxide microspheres ; The diameter of the prepared hollow iron oxide microspheres is generally 0.1-0.5 mm.

[0025] Wherein, the pretreated waste sulfonated polystyrene resin and iron-containing wastewater are mixed and impregnated according to the mass volume ratio of 3-10g:100-200ml. After drying, it is calcined at a high temperature of 500-700°C for 4-6 hours.

[0026] image 3 For the high-temperature flue gas treatment system of coal-fired power plants, the adsorbent of the present invention is sprayed into the furnace and the tail flue, so that it can be fully mixed with high-temperature coal-fired flue gas, and the arsenic oxide can be efficiently captured and ...

Embodiment 1

[0028] (1) Weigh 20g of waste sulfonated polystyrene resin, wash with deionized water, filter, place in a 40°C oven to dry for 4 hours, and seal it for later use;

[0029] (2) Take spare resin 10g and join in 200ml iron-containing waste water, this iron-containing waste water comes from a certain iron and steel factory in Henan Province, the pH of the solution is 1, and the total iron content is about 2500mg / L; After magnetic stirring for 6 hours, filter out The resin was washed and dried, and then the resin was placed in a tube furnace and calcined at 500°C for 6 hours to obtain hollow iron oxide microspheres, the surface morphology of which was as follows: figure 2 , it can be seen that the particle size is 0.5 mm.

[0030] Take the prepared hollow iron oxide microspheres and 0.5 g of the purchased analytically pure calcium oxide, iron oxide and aluminum oxide, respectively, and place them in a high-temperature fixed-bed reactor, and raise the temperature to 600 °C and 1200...

Embodiment 2

[0033] (1) Weigh 20 g of waste sulfonated polystyrene resin, wash with deionized water, filter, place in a 50°C oven for 5 hours, and seal it for later use;

[0034](2) Weigh 3g of spare resin and add it to 100ml of iron-containing wastewater. The iron-containing wastewater comes from a steel plant in Henan Province. The pH of the solution is 1, and the total iron content is about 2500mg / L; after magnetic stirring for 8 hours, filter out The resin was washed and dried, and then the resin was placed in a tube furnace and calcined at 600° C. for 5 hours to obtain hollow iron oxide microspheres.

[0035] Take the prepared hollow iron oxide microspheres and 0.5 g of the purchased analytically pure calcium oxide, iron oxide and aluminum oxide, respectively, and place them in a high-temperature fixed-bed reactor, and raise the temperature to 600 °C and 1200 °C at a rate of 10 °C / min, respectively. , and then pass into the mixed gas phase As 2 o 3 The simulated coal flue gas (As 2...

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Abstract

The invention discloses an adsorbent for desorption of a heavy metal arsenic, and a preparation method and application of the adsorbent. The adsorbent is ferric oxide microspheres of hollow structures. The preparation method of the adsorbent comprises the following steps: by taking a waste cationic resin as a raw material, directly mixing and impregnating the cationic resin with iron-containing wastewater, and performing high-temperature calcining on the obtained Fe<3+>@ resin composite material, so as to obtain hollow ferric oxide microspheres. The adsorbent for desorption of the heavy metalarsenic is fed into a combustor and a tail flue thereof in an ejection mode, and arsenic desorption in a high-temperature environment can be achieved. The hollow ferric oxide microspheres disclosed bythe invention have good high-temperature-resistant sintering performance, stability of morphologies and structures can be maintained under a high-temperature condition, large reaction areas and richactive sites can be provided for reactions of the adsorbent with an arsenic compound, the reaction process of ferric oxide with arsenic is promoted, and the capturing effect of the adsorbent on a gaseous arsenic compound in a high-temperature flue gas is effectively improved.

Description

technical field [0001] The invention relates to an adsorbent for removing heavy metal arsenic, a preparation method and application thereof, and belongs to the technical field of solid waste recycling. Background technique [0002] Arsenic-containing compounds are one of the most harmful substances in the current environment. They can enter the human body through the respiratory tract, skin and digestive tract, harm human cells, and cause various diseases, such as toxic neurasthenia, multiple neuritis, skin cancer etc. Coal combustion, waste incineration and metal smelting are the main sources of arsenic-containing waste gas. In 2014, coal accounted for 66% of my country's primary energy consumption, of which more than 51% was used for combustion, which will inevitably lead to a rapid increase in the concentration of arsenic in the atmosphere. Gaseous arsenic compounds will condense in the same phase or in different phases at low temperatures to form larger solid particles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30B01D53/10
CPCB01J20/06B01J20/28021B01D53/10B01D2257/55B01D2258/0283
Inventor 宋敏宋兵
Owner SOUTHEAST UNIV
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