desulfurization kinetics and mineral phase evolution of

desulfurization kinetics and mineral phase evolution of

Pressure intensified HO evolution from OER and ...

Sep 20, 2019  The available of HO was confirmed by bauxite desulfurization. Mineral electrolysis was an environmentally-friendly and economically-viable desulfurization method . ... Desulfurization kinetics and mineral phase evolution of bauxite water slurry (BWS) electrolysis. Int. J. Miner. Process., 139 (2015), pp. 17-24.

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Intensified hydrogen production and desulfurization at ...

Desulfurization kinetics and mineral phase evolution of bauxite water slurry (BWS) electrolysis X. Gong , Siyuan Zhuang , Lan-ping Ge , Z. Wang , M. Wang Chemistry

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Desulfurization kinetics of molten copper by gas bubbling ...

Molten copper with 0.74 wt pct sulfur content was desulfurized at 1523 K by bubbling Ar-O2 gas through a submerged nozzle. The reaction rate was significantly influenced not only by the oxygen partial pressure but also by the gas flow rate. Little evolution of SO2 gas was observed in the initial 10 seconds of the oxidation; however, this was followed by a period of high evolution rate of SO2 gas.

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公旭中-中国科学院大学-UCAS

(23) Desulfurization kinetics and mineral phase evolution of bauxite water, International Journal of Mineral Processing, 2015, 第 1 (24) Changes of total organic carbon concentration and kinetics of ultrasonic-assisted coal water slurry electrolysis in NaOH system, Fuel Processing Technology, 2014,

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Aluminum-Free Steelmaking: Desulfurization and Nonmetallic ...

In some applications, deep desulfurization and deoxidation of steels without the use of aluminum are required, using Si as a deoxidant instead, with double-saturated slags in the CaO-SiO2-CaF2-MgO system. This work studied the desulfurization and nonmetallic inclusion evolution for the system using an induction furnace and compared the results with FactSage kinetic simulations.

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Study of Modified Dry Desulfurization Ash in a Power Plant ...

To improve the CO₂ fixation ability of dry desulfurization ash (DDA), a DDA must be modified by chemical methods. At the micron level, the changes in microstructure and chemical composition before and after DDA modification were analysed by Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS), and the reaction mechanism of the modification process was inferred.

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Digestion mechanism and crystal simulation of roasted low ...

Jun 01, 2020  The methods to remove sulfur in bauxite can be mainly divided into flotation desulfurization, bioleaching desulfurization, electrolysis desulfurization, wet oxidation desulfurization and high-temperature roasting [5]. GONG et al [5] examined the desulfurization kinetics and mineral phase evolution in a bauxite water slurry electrolysis process.

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Crystal growth kinetics as an architectural constraint on ...

Oct 08, 2019  Furthermore, we show that the fabrication of these biocomposites is controlled by the organisms by regulating the growth kinetics of the mineral phase, which is suggested to be key in determining the morphospace of possible shell ultrastructures and, therefore, acts as an architectural constraint on the evolution of molluscan shells.

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Electrochemical behaviors of anode materials and their ...

Apr 01, 2019  1. Introduction. Electrochemical desulfurization was a practicable way to convert pyrite inside fossil fuel into soluble sulfate, more importantly, the organic sulfur can also be removed simultaneously .The method has already been introduced into the desulfurization of other high sulfur-containing minerals (e.g. high-sulfur coal).The main advantage of electrochemical desulfurization is

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Thermal desulfurization of pyrite: An in situ high-T ...

Jun 04, 2019  Kinetics of pyrite desulfurization. To characterize the kinetics of pyrite desulfurization, we conducted a series of DTA–TGA experiments from room temperature up to 1073 K with heating rates, ϕ, of 5, 10, 20, and 40 K/min under an argon atmosphere [Figs. 6(a)–6(c)]. Note that compared with the neutron diffraction experiments described ...

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(PDF) Let’s Protect Our Earth: Environmental Challenges ...

Microbial enzymes play a vital role to maintain the soil health and removal of pollutants from the contaminated land. Soil microflora is closely associated to maintain the fertility of the soil. Use of chemical pesticides, fertilizers and other

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Rock Minerals Study Guide [vpwpjqp34rwz]

The mineral pyrite, or iron pyrite, is an iron sulfide with the formula FeS2. This mineral's metallic luster and pale brass-yellow hue have earned it the nickname fool's gold because of its superficial resemblance to gold. The color has also led to the nicknames brass, brazzle and Brazil, [5][6] primarily used to refer to pyrite found in coal.

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China, People’s Republic Hydrogen Knowledge Centre

"The potentials of phenolic productions from lignin and black liquor (BL) via hydrothermal technology with the aids of alkalis and hydrogen donors were investigated by conducting

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Kinetic Studies on the Pyrolysis, Desulfurization ...

----- table of contents page introduction 1 the experimental apparatus 3 the interpreta tion of non -isothermal kinetic experiments 4 example of ch3sh from coal 11 hzs evolution in reactions characteristic of coal desulfuriza tion 14 iron pyrite 15 organic sulfur ] 7 kinetics of hzs evolution from ten coals 25 identification and astm analyses of ten coals 28 dependence of desulfuriza tion ...

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Aluminum-Free Steelmaking: Desulfurization and

desulfurization, the silica activity in the slag must be low when using Si as deoxidant. ... showed repeatability in characterizing steel–slag reaction kinetics and nonmetallic inclusion evolution [5,14–20]. From previous experiments, the concentration of dissolved oxygen in ... 2 phase diagram (isothermal section at 1600 °C) as plotted ...

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Numerical Investigation of Desulfurization Kinetics in Gas ...

Mar 13, 2018  A quick modeling analysis approach for predicting the slag-steel reaction and desulfurization kinetics in argon gas-stirred ladles has been developed in this study. The model consists of two uncoupled components: (i) a computational fluid dynamics (CFD) model for predicting the fluid flow and the characteristics of slag-steel interface, and (ii) a multicomponent reaction kinetics

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Chapter 5 Kinetics of Mineral Dissolution

5 Kinetics of Mineral Dissolution 153 0 1000 2000 3000 4000 5000 6000 pH 5.6 crystal Log Dissolution Rate (moles Si/cm glass 2 /s) Time (hrs) Fig. 5.2 Log dissolution rate (expressed as mol Si cm−2 s−1) as a function of reaction time mea- sured for albite crystal and glass in flow experiments (output pH = 5.

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Hot Metal Desulfurization Kinetics by

Hot metal Desulfurization kinetics were studied experimentally using CaO–Al 2O 3–SiO 2–MgO–TiO 2–Na 2O slags in the range of 1 773 K to 1 833 K. The results indicated that the rate of desulfurization increases with the Na 2O and MgO content in slag increase, the slag basicity increase, i.e., the ratio of CaO to SiO 2, Al 2O 3 and TiO

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"Coal desulfurization and demineralization by chemical ...

Nov 10, 2014  Several chemical and physical cleaning methods for removing sulfur and ash-forming mineral matter from various kinds of bituminous coal were investigated. These methods involved grinding coal to a fine size to expose or liberate the mineral matter and either physical separation or chemical leaching of the resulting particles. By combining these methods, a multistep process was developed

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Recent advances of sodium borohydride reduction in coal ...

Desulfurization kinetics and mineral phase evolution of bauxite water slurry (BWS) electrolysis X. Gong , Siyuan Zhuang , Lan-ping Ge , Zhi Wang , Mingyong Wang Chemistry

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Evolution of Sulfur Compounds and Hydrocarbons Classes in ...

A straight run gas oil has been hydrotreated with a commercial CoMo/Al2O3 catalyst, under variable conditions of severity, in order to yield processed products containing a variable amount of residual sulfur. These products have been characterized by simulated distillation, gas chromatography with sulfur-selective detection (GC−SCD), and thin-layer chromatography. The sulfur compounds have ...

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Application of a square wave potentiometry technique for ...

Sep 28, 2016  Gong X, Zhuang S, Ge L, Wang Z, Wang M (2015) Desulfurization kinetics and mineral phase evolution of bauxite water slurry (BWS) electrolysis. Int J Miner Process 139:17–24. CAS Article Google Scholar Hernandez-Maldonado AJ, Yang RT (2004) Desulfurization of transportation fuels by adsorption.

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CFD Modeling of Slag-Metal Reactions and Sulfur Refining ...

Feb 08, 2017  A CFD model capable of simulating multiphase flow with bulk and free surface turbulence phenomena and desulfurization behavior in the gas-stirred ladle has been developed. The fluid flow behavior shows that slag and metal try to entrap each other, forming a two-phase mixing zone.

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Thermal desulfurization of pyrite: An in situ high-T ...

Jun 04, 2019  Kinetics of pyrite desulfurization. To characterize the kinetics of pyrite desulfurization, we conducted a series of DTA–TGA experiments from room temperature up to 1073 K with heating rates, ϕ, of 5, 10, 20, and 40 K/min under an argon atmosphere [Figs. 6(a)–6(c)]. Note that compared with the neutron diffraction experiments described ...

More

Aluminum-Free Steelmaking: Desulfurization and Nonmetallic ...

In some applications, deep desulfurization and deoxidation of steels without the use of aluminum are required, using Si as a deoxidant instead, with double-saturated slags in the CaO-SiO2-CaF2-MgO system. This work studied the desulfurization and nonmetallic inclusion evolution for the system using an induction furnace and compared the results with FactSage kinetic simulations.

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Chemical Diversity of Metal Sulfide Minerals and Its ...

To explore the potential of metal sulfides on catalyzing prebiotic chemical reactions, here, the chemical diversity (variations in chemical composition and phase structure) of 304 natural metal sulfide minerals in a mineralogy database was surveyed.

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Role of the Size and Texture Properties of Copper-on ...

The role of the size and texture properties of industrial copper-on-alumina pellets for the simultaneous removal of SO2 and NOx from flue gas on their behavior and kinetics of SO2 capture is examined. The rate of reaction is influenced by both the intrinsic kinetics and rate of diffusion of SO2 which in turn depends on the shape and texture properties of the pellets.

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Kinetics of Mn-based sorbents for hot coal gas ...

Hot gas desulfurization may be accomplished by using solid sorbents such as oxides of those metals that form stable sulfides. The effectiveness of a desulfurizing agent in treating such gases is related to the predicted equilibrium partial pressure of hydrogen sulfide which will be present in a phase combination of the reduced form of sulfide and oxide phases.

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Hot Metal Desulfurization Kinetics by

Hot metal Desulfurization kinetics were studied experimentally using CaO–Al 2O 3–SiO 2–MgO–TiO 2–Na 2O slags in the range of 1 773 K to 1 833 K. The results indicated that the rate of desulfurization increases with the Na 2O and MgO content in slag increase, the slag basicity increase, i.e., the ratio of CaO to SiO 2, Al 2O 3 and TiO

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7252i--TJ7f

desulfurization process. This would significantly improve the marketability of Illinois coal. During this quarter aliquots of the IBC- 10 1 coal have been ground to various particles sizes in an attempt to find the optimum physical pretreatment for mineral, especially pyrite, removal.

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A Review of Modeling Hot Metal Desulfurization - Visuri ...

Jin et al. 77 proposed a kinetic model for desulfurization with powder injection. The desulfurization was assumed to take place via permanent and transitory reactions, i.e., via the top slag and the reagent powder. The transitory metal–reagent reaction was assumed to be controlled by mass transport of sulfur in the metal phase.

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(PDF) Effect of Silicon on the Desulfurization of Al ...

A kinetic model was developed and presented in part I of this paper, demonstrating that increased silicon levels in steel suppress the consumption of aluminum by parasitic reactions like silica reduction and FeO/MnO reduction, thus making more aluminum available at the interface for desulfurization.

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Calculation for Mineral Phases in the Calcination of ...

The utilization of dry flue gas desulfurization (FGD) residue has become an environmental issue in China. A new method is introduced here to produce sulfoaluminate cement using the dry FGD residue and fly ash without modification of the cement plant equipments. The bench- and pilot-scale experimental studies indicated that the obtained sulfoaluminate cement product had excellent performance ...

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Kinetic and Mechanistic Analysis of Dibenzothiophene ...

MoS2-based catalysts are the most commonly used systems for the hydrodesulfurization (HDS) process on an industrial scale. Different methods were employed to enhance the efficiency of the catalysts, which include changes in catalyst support and doping agents as well as tuning the dispersion of the MoS2 phase using various synthetic techniques. In this work, we report the kinetic and ...

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Crystal growth kinetics and its link to evolution ...

Sep 24, 2019  Crystal growth kinetics as an architectural constraint on the evolution of molluscan shells. Vanessa Schoeppler, Robert Lemanis, Elke Reich, Tamás Pusztai, László Gránásy, and

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Supercritical Water Desulfurization of Organic Sulfides Is ...

Supercritical water desulfurization (SCWDS) has potential as a technique for removing sulfur from feedstocks such as heavy oil and bitumen. However, a fundamental understanding of SCWDS (such as the underlying chemical mechanisms, relative rates of desulfurization, and the role of SCW and hydrocarbons) is limited. In the present work, we have gained molecular-level insights into this process ...

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Mineralogical Society of America - Sulfur in Magmas and ...

The solubility of sulfur-bearing minerals and the partitioning of sulfur between coexisting phases (e.g., a melt and gas phase) determine how much sulfur can be dissolved in or extracted from melts. Moreover, the diffusivity of sulfur in melts exerts a major control on the formation of bubbles and on the kinetics of mineral dissolution and growth.

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7-IJM-05-2019-0374.R3Metallurgy IJMMM-1107

et al. [3] examined the desulfurization kinetics and mineralogical evolution during the electrolysis of bauxite slurry. Chen et al. [6] investigated the influence of the desulfurization process in a suspension calcination process. Silica is the most harmful impurity in alumina production; it increases the loss of both alkali and alumina.

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Modeling the Kinetics of Hydrogen Formation by Zerovalent ...

The hydrogen evolution reaction (HER) that generates H 2 from the reduction of H 2 O by Fe 0 is among the most fundamental of the processes that control reactivity in environmental systems containing zerovalent iron (ZVI). To develop a comprehensive kinetic model for this process, a large and high-resolution data set for HER was measured using five types of ZVI pretreated by acid-washing and ...

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Desulfurization Process of High-Sulfur Coal by Full ...

The coal sample from the Shijiazhai mine located in the east of Yunnan province of China, is characterized with high ash and sulfur content which are 64.90% and 8.66% respectively. Analysis results indicate that coal and pyrite are the valuable minerals that can be recycled from the crude ore. According to the properties of the ore, a full-flotation flowsheet is proposed to process the ore.

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Demineralization and Desulfurization of Subbituminous Coal ...

Oct 12, 2001  Desulfurization of Organic Sulfur from a Subbituminous Coal by Electron-Transfer Process with K4[Fe(CN)6]. Energy Fuels 2006, 20 (1) , 287-294. DOI: 10.1021/ef050340b. Samit Mukherjee and, S. K. Srivastava. Kinetics and Energetics of High-Sulfur Northeastern India Coal Desulfurization Using Acidic Hydrogen Peroxide.

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