Mercury Removal From Coal Combustion Flue Gas by Pyrite-Modified Fly Ash Adsorbent

Abstract Pyrite and fly ash have certain advantages in adsorption and mercury oxidation. The pyrite-modified fly ash (PY+AC-FA) mercury adsorbent was prepared by mixing pyrite (PY) with acid-modified fly ash (AC-FA), which has better mercury removal effect than AC-FA. The experimental results of mercury adsorption show: when the reaction temperature is 50°C, the best doping proportion of modified fly ash is 20wt%, the mass proportion of pyrite to acid modified fly ash is 4:1, and the flue gas flow rate is 1.0L/min, the adsorbent has the best performance, and the adsorption rate of mercury reaches 91.92%. BET, XRD, SEM, TG-DSG and XRF were used to characterize these adsorbents. And the mechanism of mercury removal of pyrite-modified fly ash adsorbent is inferred: Hg0 is first adsorbed on the surface of the adsorbent, and then oxidized to HgS by the active component FeS2 in pyrite-modified fly ash.

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Mercury removal from coal combustion flue gas by modified fly ash

Journal of Environmental Sciences ◽

10.1016/s1001-0742(12)60065-5 ◽

2013 ◽

Vol 25 (2) ◽

pp. 393-398 ◽

Cited By ~ 98

Author(s):

Wenqing Xu ◽

Hairui Wang ◽

Tingyu Zhu ◽

Junyan Kuang ◽

Pengfei Jing

Keyword(s):

Fly Ash ◽

Flue Gas ◽

Coal Combustion ◽

Mercury Removal ◽

Modified Fly Ash

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Experimental Research on Fly Ash Modified Adsorption of Mercury Removal Efficiency of Flue Gas

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.800.132 ◽

2013 ◽

Vol 800 ◽

pp. 132-138 ◽

Cited By ~ 3

Author(s):

Li Li ◽

Si Wei Pan ◽

Jiang Jun Hu ◽

Ji Fu Kuang ◽

Min Qi ◽

...

Keyword(s):

Fly Ash ◽

Removal Efficiency ◽

Flue Gas ◽

Power Plants ◽

Physical Adsorption ◽

Adsorption Properties ◽

Mercury Removal ◽

Immersion Method ◽

Adsorption Temperature ◽

Modified Fly Ash

Mercury in the flue gas in coal-fired power plant as the research object using halogen compound as the modified material, the fly ash was modified by chemical immersion method，Study on adsorption agent, the adsorption temperature, modified material and loading on mercury adsorption of flue gas in coal-fired power plants. Experiments showed that, iodine adsorption properties of modified fly ash was the most significant, with the increase of the sorbent dosage, Hg removal efficiency increased, fly ash adsorption amount of change was not obvious, between 80-140°C temperature range, fly ash on mercury existed mainly physical adsorption, the mercury removal efficiency decreased with the increase of temperature, chemical adsorption occurred at 160°C, mercury removal efficiency increased.

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Experimental Study on Influence of Fly Ash on Mercury Removal in Flue Gas with UV Light

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.864-867.1546 ◽

2013 ◽

Vol 864-867 ◽

pp. 1546-1551

Author(s):

Yin Xia Cao ◽

Ji Hui Fang ◽

Jiang Wu ◽

Xian Li ◽

Chong Zhang ◽

...

Keyword(s):

Fly Ash ◽

Flue Gas ◽

Uv Light ◽

Mercury Content ◽

Mercury Removal ◽

Mercury Adsorption ◽

Important Condition ◽

Photocatalytic Effect ◽

Photocatalytic Removal ◽

Different Characteristics

The original fly ash samples fetched from the power plant and the treated fly ash samples after screening, magnetic separation and mixing were used in the experiment of photocatalytic removal on mercury in flue gas. The fly ash samples and the absorption solution after experiment were tested for mercury content. The results showed that different sizes of the original fly ash had different characteristics of photocatalytic removal of mercury. The adsorption of mercury by fly ash was an important condition for the occurrence of photocatalytic effect. When the mercury adsorption capacity of fly ash was stronger, the capacity of photocatalytic removal mercury was also greater. The presence of iron oxide on the fly ash surface can promote the capability of photocatalytic removal of mercury by fly ash. The presence of ultraviolet light can significantly promote Hg0 oxidize to Hg2+ by fly ash. Thus the oxidized mercury in the flue gas can be easily absorbed by the solution.

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Gas-phase elemental mercury removal from flue gas by cobalt-modified fly ash at low temperatures

Environmental Technology ◽

10.1080/09593330.2014.924569 ◽

2014 ◽

Vol 35 (22) ◽

pp. 2870-2877 ◽

Cited By ~ 16

Author(s):

Yalin Xu ◽

Qin Zhong ◽

Lili Xing

Keyword(s):

Fly Ash ◽

Gas Phase ◽

Flue Gas ◽

Low Temperatures ◽

Elemental Mercury ◽

Mercury Removal ◽

Modified Fly Ash

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Mercury Removal from Coal Combustion Flue Gas by Fly Ash

Cleaner Combustion and Sustainable World ◽

10.1007/978-3-642-30445-3_55 ◽

2012 ◽

pp. 395-399

Author(s):

Junyan Kuang ◽

Wenqing Xu ◽

Tingyu Zhu ◽

Pengfei Jing

Keyword(s):

Fly Ash ◽

Flue Gas ◽

Coal Combustion ◽

Mercury Removal

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Regenerable Cobalt Oxide Loaded Magnetosphere Catalyst from Fly Ash for Mercury Removal in Coal Combustion Flue Gas

Environmental Science & Technology ◽

10.1021/es504419v ◽

2014 ◽

Vol 48 (24) ◽

pp. 14837-14843 ◽

Cited By ~ 101

Author(s):

Jianping Yang ◽

Yongchun Zhao ◽

Junying Zhang ◽

Chuguang Zheng

Keyword(s):

Fly Ash ◽

Cobalt Oxide ◽

Flue Gas ◽

Coal Combustion ◽

Mercury Removal

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Experimental Study on the Spray of Mercury Removal Performance of Flue Gas Desulfurization Wastewater

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.807-809.1483 ◽

2013 ◽

Vol 807-809 ◽

pp. 1483-1488

Author(s):

Si Wei Pan ◽

Nian Tang ◽

Jiang Jun Hu ◽

Ji Fu Kuang ◽

Min Qi ◽

...

Keyword(s):

Experimental Study ◽

Fly Ash ◽

Flue Gas ◽

Cost Savings ◽

Chloride Ion ◽

Elemental Mercury ◽

Flue Gas Desulfurization ◽

Mercury Removal ◽

Modified Fly Ash ◽

Desulfurization Wastewater

For coal-fired power plant boiler flue gas desulfurization wastewater’s actual spraying proposed combination bag house dust while mercury removal process. Experimental study of the coal-fired boiler flue gas spraying chlorine ions and other halogens desulfurization wastewater modified fly ash flue gas mercury performance. Studies showed that desulfurization wastewater fly ash on chloride ion enhanced oxidation of elemental mercury, with the increase in the amount sprayed desulfurization wastewater, flue gas mercury capacity increased. Desulfurization wastewater add another halogen element can promote flue gas mercury performance, the effect of iodine was the most significant, followed by bromine. The desulfurization wastewater as a modified liquid sprayed into the flue modified fly ash, fly ash can improve mercury removal performance, eliminate the need for desulfurization wastewater treatment, cost savings, achieve desulfurization wastewater recycling.

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