Preparation of Modified Fly Ash and its Adsorption Properties for U(VI) Uranium

2017 ◽  
Vol 873 ◽  
pp. 107-111 ◽  
Author(s):  
Xi Xie ◽  
Shu Kui Zhou
Keyword(s):  
Experimental Study ◽  
Fly Ash ◽  
Power Plant ◽  
Contact Time ◽  
Southern China ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Adsorption Performance ◽  
Uranium Tailings ◽  
Modified Fly Ash

The paper has taken a fly ash of power plant in southern China as the research object, in view of the fly ash were modified, the research of the modified fly ash on the experimental study of nuclide uranium adsorption of uranium tailings. A modified fly ash and B modified fly ash were prepared with a-zeolite while using Na2CO3 and NaOH as intercalated material respectively. By changing the pH, initial U(VI) ions concentration, temperature of environment, and contact time, the best conditions of adsorption was selected out. By comparing the properties of two different modified fly ash composites, it is not difficult to find that the theoretical adsorption capacity of U(VI) is higher and the removal rate of U(VI) is higher than that of U(VI). Therefore, modified fly ash B had a better adsorption performance.

Study on Mercury Adsorption Performance of Modified Fly Ash

2011 ◽  
Vol 343-344 ◽  
pp. 246-249 ◽  
Author(s):  
Ting Yu Zhu ◽  
Jun Yan Kuang ◽  
Wen Qing Xu ◽  
Meng Ye ◽  
Yang Yang Guo ◽  
...  
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
Active Sites ◽  
Chemical Adsorption ◽  
Mercury Adsorption ◽  
Adsorption Performance ◽  
Removal Efficiencies ◽  
Modified Fly Ash

The fly ash was modified by Cl, Fe, Cu salts to investigate the mercury adsorption performance and analyze the impacts on it. Experiment results indicate that significant improvement of removal efficiencies with FeCl3、CuCl2 and CuBr2 impregnation onto fly ash. The modification adjusted the pore structure of fly ash and formed more pores to absorb Hg, also it was found that new active sites were generated after the treatment, which can oxidize Hg0 and improve chemical adsorption.

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

2013 ◽  
Vol 800 ◽  
pp. 132-138 ◽  
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.

scholarly journals Possibility of Removing Pb and Cd from Polluted Water by Modified Fly Ash

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xi Chen ◽  
Guibin Zhang ◽  
Jingtian Li ◽  
Puhui Ji
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Polluted Water ◽  
Mass Ratio ◽  
Order Model ◽  
Adsorption Performance ◽  
Pseudo Second Order ◽  
Roasting Temperature ◽  
Polluted Wastewater ◽  
Modified Fly Ash

In this study, fly ash (FA) was modified by sodium hydroxide to prepare a new adsorption material (IP) and treat Pb2+- and Cd2+-polluted wastewater. The effect of preparation parameters (mass ratio of FA/NaOH and modification temperature) on IP adsorption performance was investigated. The results indicated that the IP4 showed the highest adsorption capacity prepared at the FA/NaOH mass ratio of 1 : 2 and the roasting temperature of 250°C. The IP4 was characterized by SEM, EDX, XRD, and FTIR analyses. The results showed that the surface morphology and microstructure of FA were significantly changed. Furthermore, in order to study the adsorption performance of Pb2+ and Cd2+ on IP4, the different initial concentrations of Pb2+ and Cd2+, pH, and contact time were analyzed, and the results indicated that IP4 has excellent adsorption capacity for heavy metals. In addition, kinetic model results demonstrated that the adsorption behavior of Pb2+ and Cd2+ on IP4 was better described by a pseudo-second-order model.

scholarly journals Experimental Study on Consolidation-Creep Behavior of Subgrade Modified Soil in Seasonally Frozen Areas

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5138
Author(s):  
Fuyu Wang ◽  
Weichen Pang ◽  
Ziqi Li ◽  
Haibin Wei ◽  
Leilei Han
Keyword(s):  
Experimental Study ◽  
Fly Ash ◽  
High Strength ◽  
Crumb Rubber ◽  
Climatic Conditions ◽  
Waste Utilization ◽  
Road Design ◽  
Creep Characteristics ◽  
Modified Fly Ash ◽  
Modified Soil

Frost heaving and boiling are the most common road disorders due to the special climatic conditions in a seasonal frozen area. From the perspective of controlling road disorders in seasonally frozen areas and making effective use of industrial waste residue, two kinds of subgrade modified soil—crumb rubber modified fly ash soil (CRFS) and oil shale waste residue modified fly ash soil (OSFS)—were proposed by the research group. The research results proved that the two new subgrade fillers both have excellent engineering characteristics in cold areas, such as high strength and low thermal conductivity, and both have the function of waste utilization, giving them broad application prospects. In road engineering, the instability of slopes and retaining walls and the uneven settlement of the subgrade are closely related to soil creep, which are problems that cannot be ignored in road design and use. As a new material to treat road disorders in seasonally frozen areas, more attention should be paid to the continuous deformation property of modified soil under long-term load. The study on the creep characteristics of the modified soil can provide reliable parameters for the design of the modified soil subgrade and predict the settlement of the subgrade after construction, which is of great significance to the stability of the subgrade. In this paper, an experimental study on the consolidation–creep characteristics of two kinds of subgrade modified soil in a seasonal frozen region was carried out, the relationship between modified soil deformation and time is discussed, and the effects of different moisture contents and compaction degrees on the creep characteristics of modified soil were analyzed. The test results provide parameters for the engineering design of modified soil subgrade and provide data support for the popularization and application of modified soil in seasonally frozen subgrade.

Coupling of bromide and on-line mechanical modified fly ash for mercury removal at a 1000 MW coal-fired power plant

Fuel ◽  
2019 ◽  
Vol 247 ◽  
pp. 179-186 ◽  
Author(s):  
Shumin Wang ◽  
Yongsheng Zhang ◽  
Yongzheng Gu ◽  
Jiawei Wang ◽  
Xuehai Yu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
Mercury Removal ◽  
On Line ◽  
Modified Fly Ash

Experimental Research on Mercury-Containing Wastewater in PVC Production by Fly Ash Processing Calcium Carbide Method

2014 ◽  
Vol 878 ◽  
pp. 578-584 ◽  
Author(s):  
Yan Li ◽  
Ping Sun
Keyword(s):  
Fly Ash ◽  
Ph Value ◽  
Removal Rate ◽  
Operating Cost ◽  
Calcium Carbide ◽  
Emission Standard ◽  
Removal Capacity ◽  
Positive Treatment ◽  
The Government ◽  
Modified Fly Ash

To study the removal capacity of modified fly ash in wastewater containing mercury ions under different conditions, the dust from a calcium carbide furnace was added to fly ash, and the pyrogenic process was employed to modify the fly ash. The result indicated that the wastewater had a pH value of 9, the modified fly ash dosage was 0.2 g, the adsorption equilibrium time was 40 minutes, the reaction temperature was 30 °C, and the removal rate could reach 91.9%. Using modified fly ash in polyvinyl chloride production via the calcium carbide method to remove mercury-containing wastewater can help meet the government-prescribed emission standard. This method has advantages such as positive treatment effect, simple operation, and low operating cost.

Effect of modified fly ash injection on As, Se, and Pb emissions in coal-fired power plant

2020 ◽  
Vol 380 ◽  
pp. 122561 ◽  
Author(s):  
Jiawei Wang ◽  
Yongsheng Zhang ◽  
Tao Wang ◽  
Hong Xu ◽  
Wei-Ping Pan
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
Modified Fly Ash
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