Thermogravimetric Kinetics of MgSO3·6H2O Byproduct from …
Wet flue gas desulfurization using a magnesia slurry sorbent in coal-fired power plants has been used because of its high SO 2 removal efficiency and reliable and low utility consumption. The …
Simultaneous magnesia regeneration and sulfur dioxide generation …
A method was proposed for simultaneously regenerating magnesia from the Mg-based flue gas desulfurization byproducts in the power plant and generating the high concentration of sulfur dioxide.Elemental sulfur particles were evaporated to sulfur vapor and the latter one was used as the reductive agent to regenerate magnesia from the magnesium …
Transposition of wet flue gas desulfurization using MgO by-products …
The transposition of a sustainable wet flue gas desulfurization (WFGD) process from a discontinuous batch reactor at laboratory scale to a pilot scale scrubber was performed by means of three transposition variables: time of saturation (t S), liquid-to-gas ratio (L/G) and pH.Thus, the results obtained by the authors in the past studies at laboratory scale were …
NEW MAGNESIUM – ENHANCED LIME FLUE GAS …
4 1998) to convert some of its customers FGD system to ones that produced valuable by-products, calcium sulfate dihydrate, or gypsum, and magnesium hydroxide, using
Dissolution rate of magnesium hydrate for wet flue gas desulfurization
A previous study carried out by the authors allowed to identify the optimum MgO by-product for a SO 2 removal efficiency in a wet flue gas desulfurization (FGD) process. The present research analyzes the synergistic effect between the main parameters affecting the proposed desulfurization process.
Enhanced oxidation of MgSO3 during desulfurization by a …
The magnesium-based seawater exhaust gas clean system is effective in reducing sulfur dioxide emission from marine diesel engines. Oxidation of the desulfurization by-product, magnesium sulfite (MgSO 3), is required for recycling.However, the oxidation efficiency is generally low in the aeration tank after the desulfurization process, making the tank volume too …
Synergistic effect of the parameters affecting wet flue gas
An early research work carried out by the authors enabled identifying the main parameters affecting the performance of low-grade magnesium oxides as desulfurization …
Studies on magnesium-based wet flue gas desulfurization …
Moreover, magnesium sulfate, which is obtained as the desulfurization product, can be used as an industrial raw material or agricultural fertilizer and has a high economic value [5] [6][7]. To ...
Characterization of magnesium-calcium oxysulfate cement prepared …
A new magnesium-calcium oxysulfate cement (MCOSC) was proposed by replacing MgSO4 in magnesium oxysulfate cement (MOSC) with untreated flue gas desulfurization gypsum (FGDG) at levels of 25%, 50%, 75% and . The synergistic effect of FGDG and chemical additives, including citric acid, ammonium citrate tribasic and ammonium dihydrogen …
Effects of flue gas desulfurization gypsum incorporation …
Flue gas desulfurization gypsum (FGDG) is an industrial by-product of the flue gas desulfurization process in coal-fired power plants [28]. The continuous development of our industrial era will bring more and more industrial by-products. ... In this study, a modified magnesium slag-based cementitious material (M·C) for mine filling was ...
The hydration mechanism of magnesium oxysulfate cement …
The forced oxidation of magnesium sulfite (MgSO3) aims to not only reclaim the by-product in the magnesia desulfurization, but also lower the risk of secondary pollution.
Synergistic effect of the parameters affecting wet flue gas
The desulfurization byproduct of magnesium sulfate (MgSO 4 ), converted from oxidation of magnesium sulfite (MgSO 3 ) by injected air, is generally used as fertilizer or chemical resource raw ...
Effects of flue gas desulfurization gypsum incorporation …
Flue gas desulfurization gypsum (FGDG) is an industrial by-product of the flue gas desulfurization process in coal-fired power plants [28]. The continuous development of our industrial era will bring more and more industrial by-products. The process of treating FGDG requires substantial financial resources and land [29], [30]. This is a serious ...
New process for recycling magnesium sulfate heptahydrate …
The invention discloses a new process for recycling magnesium sulfate heptahydrate by utilizing magnesium oxide flue gas desulfurization. The new process is characterized by comprising the following steps: (1) magnesium oxide pulping; (2) flue gas desulfurization; (3) evaporation warming; (4) filter purification and cooling crystallization; (5) centrifugal separation; and (6) …
Flue gas desulfurization by magnesium hydroxide method
The sulfur dioxide (SO2) in the flue gas is absorbed by a magnesium-based slurry, and the resulting magnesium sulfite (MgSO3) is calcined to regenerate magnesium oxide (MgO), which is recycled back to the power plant for reuse in the scrubbing section. The sulfur value from the SO2-rich by-product gas is recovered.
Product development of FGD recovered magnesium …
The use of magnesium-enhanced lime avoids the mineral impurities from direct neutralization when using pulverized limestone rock. White, pure FGD synthetic gypsum can be used to produce higher value products such as mineral fillers and industrial plasters. This paper focuses on the product development of the Mg(OH){sub 2} by-product.
Research on the incorporation of untreated flue gas desulfurization …
The growing concern of low-carbon economy and sustainable development has obliged the researchers to investigate green building materials through utilizing industrial by-products. In this study, the industrial waste material, flue gas desulfurization gypsum (FGDG), is incorporated into the magnesium oxysulfate cement (MOSC). The performance of FGDG …
Recovery method of magnesium oxide flue gas desulfurization product
Existing magnesium oxide method desulfurization and recovery technological process are as shown in Figure 1.Enter desulfurization in the absorption tower from the flue gas behind the boiler dusting through reheater and pre-wash cooling, flue gas after being purified is sent into smoke stack emission through demist dehydration and hot again the intensification.The desulfurizer …
Reutilization of low-grade magnesium oxides for flue …
end of the process were mainly composed of unreacted magnesium and calcium compounds and reaction products CaSO 4 2H 2O and MgSO 4 6H 2O which can be used as fertilizers. Therefore, the reutilization of these by-products in a wet flue gas desulfurization process is a feasible and sustainable choice that allows extending their life-cycle. 2014 ...
Hydrothermal recovery and reuse of oxidated by-products in magnesium …
A large volume of highly concentrated magnesium salt solution is produced during magnesium flue gas desulfurization. Existing method of concentration recovery is relatively inefficient and ...
Production and resource utilization of flue gas desulfurized …
Flue gas desulfurized gypsum mainly comes from thermal power plants, smelters, and large-enterprise boilers, and contains industrial by-products produced through a wet desulfurization combustion process, where SO 2 gas and lime slurry react under strong oxidation conditions. The main component of this gypsum is calcium sulfate dihydrate, which also …
HOT METAL DESULFURIZATION
HOT METAL DESULFURIZATION IRON DESULFURIZATION SOLUTIONS. Opta is the world's leading supplier of magnesium reagents, calcium-carbide, and lime-based carrier reagents for use in the iron desulfurization process. We offer injectable ironmaking desulfurizing products as well as injection and custom-built equipment.
(PDF) Flue Gas Desulfurization: Physicochemical and …
The processes for microbial desulfurization of the flue gas are among the recent emerging biotechnological approaches for the removal of sulfur dioxide from industrial emissions. Microbial desulfurization overcomes the need to use costly chemical reagents and does not produce any disposable waste.
(PDF) Prevention of Resulfurization in Magnesium …
We have proposed a new method of desulfurization of molten iron with magnesium vapor produced in situ by carbothermic and aluminothermic reduction of magnesium oxide.
The Effect of Magnesium Gas Injecting Conditions on …
of these by-products are important subjects. Magnesium desulfurization of hot metal itself is a well known technol-ogy,5) but Yang et al.1–4) have shown a possibility of highly efficient magnesium desulfurization of hot metal as shown in Fig. 1. The important concept included in this diagram that to obtain high desulfurization efficiency ...
Limestone fines and lime sludge: from by-product waste to …
Each year, millions of tons of by-product fines are produced during the crushing and processing of limestone and dolomite quarried in the United States. Similarly, a large amount of lime sludge is produced in the United States from water treatment plants that use lime softening to reduce the calcium and magnesium hardness of the source water.
On the Desulfurization Rate of Hot Metal by Magnesium …
Synopsis: Cold and hot model experiments have been made to investigate the kinetics of desulfurization fhot metal by magnesium granules injected with carrier gas.The followings are the major remarks obtained: (1)The desulfurization rate is remarkably enhanced when the bath surface is covered with inert gas. (2)Itis theoretically predicted that a magResium particle of …
Recovery of SO2 and MgO from By-Products of MgO Wet …
The magnesium oxide desulfurization by-products were stored in a feed bin after pulverization. A metering screw conveyor was used to send the by-products to a Venturi feeder (driven by high …
Behavior of Magnesium in the Desulfurization Process …
the dissolved magnesium concentration in the molten iron and the magnesium vapor pressure: [ppmMg]/P Mg (atm) 5600 at 1533K. Furthermore, combining with the thermo-dynamic data of the desulfurization by magnesium vapor, they deduced the solubility product of magnesium and sul-fur in the molten iron as [ppmMg]·[ppmS] 180. Zhang et al.
Experimental investigation of MgSO3 oxidation process by …
Catalytic oxidation of magnesium sulfite (MgSO 3) into magnesium sulfate (MgSO 4) is essential for recycling and utilization in the magnesium desulfurization processes.In this paper, laboratory-scale experiments were carried out to compare catalytic activity of different catalysts, which showed that cobalt ions (Co 2+) were highly efficient for MgSO 3 oxidation …