Modified zeolite as a sorbent for removal of contaminants from wet flue gas desulphurization wastewater

The properties of flue gas desulphurization (FGD) gypsum were analysized by Thermo-gravimetry/differential scanning calorimetry (TG/DSC), technical performance analysis, optical microscope and Scanning electron microscope (SEM). Mechanical properties of FGD gypsum-steel slag powder cementitious material were researched. The results revealed that FGD gypsum have similar moisture content, major component CaSO4·2H2O with natural gypsum, and has better technical performance than natural gypsum. The results of optical microscope and SEM of the FGD gypsum hydration support this further. When the dosage of steel slag powder is 15%, containing activator ,better mechanical properties can be obtained. Key words: FGD gypsum, Property, Cementitious material

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Study on Mechanism of Flue Gas Desulfuration by Using Liquid-Phase Biochemical Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.1556 ◽

2011 ◽

Vol 356-360 ◽

pp. 1556-1560

Author(s):

Zhi An Liu ◽

Ying Chang ◽

Peng Wang ◽

Jlan Jun Jia ◽

Qi Wang Liu

Keyword(s):

Flue Gas ◽

Rate Increase ◽

The Self ◽

Inlet Concentration ◽

Critical Factors ◽

Biochemical Method ◽

Solution Ph ◽

Flue Gas Desulfuration ◽

Increasing Temperature ◽

Flue Gas Desulphurization

Wet Biochemical Flue Gas Desulphurization technique (WB-FGD) is combined both catalyst of transition metal with microbial metabolize to achieve flue gas desulphurization. In the self-designed device of power plant flue gas desulphurization, study the desulphurization kinetics according to the absorption solution pH, Fe3+concentration, inlet concentration of SO2, temperature and other factors. The results show that: Concentration of Fe3+is the most critical factors in the desulphurization process, the desulphurization efficiency is decreased with the increasing of Fe3+concentration, which in the range of 0~0.01mol·L-1, and the desulphurization efficiency do not change significantly with the further increasing of the concentration of Fe3+.the desulphurization efficiency is decreased with the increasing concentration of H+when pH of the solution in the range of 1.5~3.5. The efficiency of desulphurization decrease with the increasing concentration of SO2, which in the range of 1145-3432mg·L-1. The oxidation rate increase with the increasing temperature at 20~40°C.The kinetic equation and controllable parameters of changes of Fe3+concentration are obtained according to the experimental data in WB-FGD.

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Effect of Kaolin on the Properties of Flue Gas Desulphurization Gypsum-Steel Slag Cementitious Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.306-307.1553 ◽

2011 ◽

Vol 306-307 ◽

pp. 1553-1556

Author(s):

Lei Zhang ◽

Zhi Wang ◽

Li Ying Fan ◽

Guo Pu Shi

Keyword(s):

Flue Gas ◽

Setting Time ◽

Steel Slag ◽

Cementitious Materials ◽

Cementitious Composites ◽

Excitation Mechanism ◽

Final Setting Time ◽

Micro Morphology ◽

Scanning Electron ◽

Flue Gas Desulphurization

The effects of kaolin on the properties of flue gas desulphurization gypsum-based steel slag composites were analyzed in this article and the influence rules of setting time, final setting time on the flexural strength and compressive strength of cementitious composites were also discussed. The micro-morphology of the composite was observed by scanning electron microscope. At the same time, the excitation mechanism of kaolin on gas desulphurization gypsum-based steel slag was put forward. It was demonstrated that kaolin with content of 3% in the composites can better stimulate the activity of steel slag and improve the mechanical properties of cementitious composites.

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