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Adsorbent applicable to flue gas dearsenization and dearsenization method thereof

An adsorbent and flue gas technology, applied in the field of flue gas pollution removal, can solve the problems of limited arsenic removal effect in flue gas, and achieve the effects of reducing arsenic content, improving adsorption effect, and long reaction time

Active Publication Date: 2018-04-20
扬州兄联冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to overcome the problem that there is no special adsorbent for flue gas arsenic removal in the prior art, resulting in limited effect of flue gas arsenic removal, and to provide an adsorbent for flue gas arsenic removal and a method for removing arsenic , through the combination of calcium oxide, metallurgical slag, zeolite and fly ash, the adsorbent combines chemical adsorption and physical adsorption, greatly improving the adsorption effect of the adsorbent

Method used

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  • Adsorbent applicable to flue gas dearsenization and dearsenization method thereof
  • Adsorbent applicable to flue gas dearsenization and dearsenization method thereof
  • Adsorbent applicable to flue gas dearsenization and dearsenization method thereof

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Embodiment 1

[0026] An adsorbent for flue gas dearsenization of the present invention includes calcium oxide, metallurgical slag, zeolite and fly ash. The addition of fly ash is M4=γ(M1+αM2-δM3)-β / (1-α)M2, wherein: M1 is the quality of calcium oxide, M2 is the quality of metallurgical slag, and M3 is the quality of zeolite; Take 0.15~0.25, δ takes 1.5-2, where it is worth noting that: α is the mass percentage of CaO and MgO in metallurgical slag; β is the content of Fe in metallurgical slag 2 o 3 and MnO mass percent content. The mass ratio of calcium oxide to zeolite is 4-8, and 5 is used in this embodiment.

[0027] Calcium oxide 60kg of the present embodiment, metallurgical slag 20kg, zeolite 12kg; Calculate the quality of fly ash to be: M4=γ(60+α20-δ12)-β / (1-α)20=8.14kg wherein γ gets 0.2 , δ is taken as 1.5, the fly ash has a larger specific surface area, and the fly ash and zeolite have a better adsorption effect on arsenic, so that the residence time of arsenic and its oxides on ...

Embodiment 2

[0052] The basic content of this embodiment is the same as that of the embodiment, except that it also includes additives, and the additives include blast furnace ash, chrome slag and mullite; each component is composed according to the following parts by mass: blast furnace ash: 60%, chromium Slag: 20%, mullite: 20%. The additive is added in an external manner, and the amount of the additive is 1-2% of the adsorbent, which is 1% in this embodiment, that is, the amount of the additive is 1% of the sum of the mass of calcium oxide, metallurgical slag, zeolite and fly ash. -2%. Under high temperature conditions, the metal elements in the additives promote the electron shift in fly ash and converter slag under high temperature conditions, thereby promoting the arsenic in the flue gas to enter the vacancies and bridges of O in calcium oxide, improving In addition, the metal in the additive promotes the arsenic in the fly ash to enter the vitreous aluminosilicate mineral lattice, ...

Embodiment 3

[0066]The basic content of this embodiment is the same as that of Embodiment 1, and an accelerator is also included, and the accelerator is an organic substance with an aspect ratio greater than 1000. The accelerator in this embodiment is plant fiber or animal hair fiber or plastic fiber, and the accelerator is added in an external manner. The addition amount of calcium oxide, metallurgical slag, zeolite and fly ash quality sum 0.05-0.2%; What present embodiment adopts is the mixture of animal hair fiber and cotton fiber, and the ratio of the quality of hair fiber and cotton fiber is 2 : 1; by adding hair fiber and cotton fiber in the adsorbent, larger mesopores can be distributed in the adsorption after treatment, which greatly improves the adsorption specific surface area of ​​the adsorbent, and can improve the adsorption effect of the adsorbent; in addition, The pores are connected to each other, thereby promoting the transformation from physical adsorption to chemical adso...

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Abstract

The invention provides an adsorbent applicable to flue gas dearsenization and a dearsenization method thereof, and belongs to the technical field of flue gas dearsenization. The adsorbent comprises calcium oxide, metallurgical slag, zeolite and pulverized fuel ash, wherein the amount of the added pulverized fuel ash is M4=gamma (M1+alpha M2-delta M3)-beta / (1-alpha) M2, wherein M 1 is the mass ofcalcium oxide; M2 is the mass of metallurgical slag; M3 is the mass of zeolite; gamma is 0.15-0.25; delta is 1.5-2; alpha is the mass percentage contents of CaO and MgO in the metallurgical slag; betais the mass percentage contents of Fe2O3 and MnO in the metallurgical slag. With the adoption of the adsorbent, the standing time of arsenic and oxide thereof on the surface of the adsorbent is prolonged, so that the reaction time of the adsorbent and arsenic and oxide thereof is prolonged, and as a result, the reaction process of calcium oxide and arsenic is accelerated; the pulverized fuel ashand the converter slag act together to promote the decomposing of ferric oxide, so that arsenic and oxide thereof can completely react with the ferric oxide or calcium oxide for improving the activityof metallurgical slag, and as a result, the effect of the adsorbent adsorbing arsenic can be improved.

Description

technical field [0001] The invention belongs to the technical field of smoke pollution removal, and specifically relates to an adsorbent for removing arsenic from flue gas and a method for removing arsenic. Background technique [0002] A large amount of SO in the flue gas 2 , NO x Due to the huge amount of emissions and high concentration of pollutants such as pollutants, people have carried out related research work on them very early and made remarkable achievements. With the increasing pressure of environmental protection, researchers have found that the trace elements enriched in the flue gas will also cause great harm to the human body and the environment after entering the atmosphere, mainly because the trace elements are precipitated and migrated. It is easy to accumulate on the surface of micron and submicron particles, form a sol in the atmosphere and suspend it for a long time, enter the human lungs and cause severe respiratory diseases. [0003] Among them, ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30B01D53/81B01D53/46
CPCB01D53/02B01D53/46B01D53/81B01D2251/404B01D2251/602B01D2258/0283B01J20/041B01J20/165
Inventor 王海军凌海涛常立忠施晓芳彭世恒周俐王建军
Owner 扬州兄联冶金科技有限公司
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