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  • Desulfurization kinetics and mineral phase evolution of

    10-06-2015· The desulfurization kinetics and mineral phase evolution from bauxite water slurry (BWS) electrolysis were examined. The results showed that the desulfurization ratio in NaCl system increased with current density, and reached up to 96% at 0.22 A/cm 2.

    10.1016/j.minpro.2015.04.010 DeepDyve

    11-06-2020· Using NaOH and NaCl as support electrolyte, the desulfurization kinetics and mineral phase evolution were examined during high sulfur bauxite electrolysis process to explain desulfurization mechanism.</P>2 Experiment</h5> 2.1 Sample</h5> A type of high sulfur bauxite, from GUIZHOU province in China, was selected as experimental sample, and its properties were listed in

    Desulfurization kinetics and mineral phase evolution of

    07-11-2015· Desulfurization kinetics and mineral phase evolution of bauxite water slurry (BWS) electrolysis

    Kinetics of coal desulfurization with sodium benzoxide

    Mae Moh coal of Lampang province, northern Thailand, was desulfurized by leaching with organometallic compounds. Most of the inorganic sulfur and some organic sulfur were removed. The effect of process conditions (temperature, time and particle size) on the degree of desulfurization was studied and optimum conditions were established. It is shown that sodium benzoxide can leach ∼ 68% of

    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.

    Effects of electrolyte recycling on desulfurization from

    01-06-2016· Desulfurization kinetics and mineral phase evolution of bauxite water slurry (BWS) electrolysis [J] International Journal of Mineral Processing,139 ( 2015 ),pp. 17 24 Article Download PDF View Record in Scopus Google Scholar

    Preparation and desulfurization kinetics of activated

    30-03-2017· Microporous activated carbons were prepared from the semi-coke of coal liquefaction residual by KOH activation. The gas evolution during the activation process was analyzed by thermogravimetry–mass spectrometry. The SO2 adsorption equilibrium and desulfurization kinetics at low temperatures were also investigated. The results of this study indicate that three reactions are

    Kinetics of coal desulfurization with sodium benzoxide

    Mae Moh coal of Lampang province, northern Thailand, was desulfurized by leaching with organometallic compounds. Most of the inorganic sulfur and some organic sulfur were removed. The effect of process conditions (temperature, time and particle size) on the degree of desulfurization was studied and optimum conditions were established. It is shown that sodium benzoxide can leach ∼ 68% of

    Calculation for Mineral Phases in the Calcination of

    Calculation for Mineral Phases in the Calcination of Desulfurization Residue to Produce Sulfoaluminate Cement. Experiments and Modeling of Ash Mineral Evolution in Burning High-Sulfur Coal with Lime. Kinetic model for calcium sulfate decomposition at high temperature.

    Suspension calcination and alkali leaching of low-grade

    To enable the utilization of low-grade and high-sulfur bauxite, the suspension calcination was used to remove the sulfur and the activate silica minerals, and the calcinated bauxite was subjected to a desilication process in NaOH solution under atmospheric pressure. The desulfurization and desilication properties and mineralogical evolution were studied by X-ray diffraction, thermogravimetry

    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.

    Minerals Free Full-Text Desulfurization of the Old

    Tailings from the abandoned Tiouit mine site in Morocco are mainly composed of sulfides, hematite, and quartz. They contain 0.06–1.50 wt % sulfur, mostly in the form of pyrite, pyrrhotite, and chalcopyrite. The tailings also contain gold (3.36–5.00 ppm), silver (24–37 ppm), and copper (0.06–0.08 wt %). Flotation tests were conducted to reprocess the tailings for Au, Ag, and Cu recovery

    A Review of Modeling Hot Metal Desulfurization Visuri

    Hot metal desulfurization is commonly conducted in a ladle or a torpedo car, 1 using a desulfurization reagent that is either injected into the metal bath or added on top of it. 2 From the thermodynamic point of view, the fundamental requirement for the desulfurization reagent is to be able to donate electrons and form a new sulfide‐binding phase. 3 Typical reagents used in the industry are

    Replacement of fluorspar in the desulfurization of hot metal

    Evolution of fluoride compounds from mould powder KIM, D. J., LEE, H. G. Reaction kinetics of desulfurization of molten pig iron using CaO-SiO2-Al2O3-Na2O Slag Systems. ISIJ for the Ilmenite reagent. Labelled as Calcite is a 44.6% oxygen, 1.39% aluminum, 54.1 % calcium phase; unclassified is a phase with roughly 33% oxygen, 1

    Crystal growth kinetics as an architectural constraint on

    08-10-2019· 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.

    EVALUATION OF LIMESTONE IMPURITIES IN THE

    EVALUATION OF LIMESTONE IMPURITIES IN THE DESULFURIZATION PROCESS OF COAL COMBUSTION GAS. 1 Federal University of Rio Grande do Sul, Av. Osvaldo Aranha, 99/711, CEP: 900135-190, Porto Alegre RS, Brazil. Phone: + 55 51 3308-3594; Fax: + 55 51 3308-3405 E-mail: [email protected]

    Crystal growth kinetics and its link to evolution

    24-09-2019· Crystal growth kinetics as an architectural constraint on the evolution of molluscan shells. Vanessa Schoeppler, Robert Lemanis, Elke Reich, Tamás Pusztai, László Gránásy, and Igor Zlotnikov

    Calculation for Mineral Phases in the Calcination of

    Calculation for Mineral Phases in the Calcination of Desulfurization Residue to Produce Sulfoaluminate Cement. Experiments and Modeling of Ash Mineral Evolution in Burning High-Sulfur Coal with Lime. Kinetic model for calcium sulfate decomposition at high temperature.

    Review on desulfurization in electroslag remelting

    28-02-2020· Electroslag remelting (ESR) gives a combination of liquid metal refining and solidification structure control. One of the typical aspects of liquid metal refining during ESR for the advanced steel and alloy production is desulfurization. It involves two patterns, i.e., slag–metal reaction and gas–slag reaction (gasifying desulfurization). In this paper, the advances in desulfurization

    Replacement of fluorspar in the desulfurization of hot metal

    Evolution of fluoride compounds from mould powder KIM, D. J., LEE, H. G. Reaction kinetics of desulfurization of molten pig iron using CaO-SiO2-Al2O3-Na2O Slag Systems. ISIJ for the Ilmenite reagent. Labelled as Calcite is a 44.6% oxygen, 1.39% aluminum, 54.1 % calcium phase; unclassified is a phase with roughly 33% oxygen, 1

    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.

    A Mathematical Model of Desulphurization Kinetics for

    In order to clarify the influence of operation conditions on desulphurization kinetics, mathematical models for simulating powder injection desulphurization in RH were proposed by many researchers. 20,21,22,23) Wei et al. 21) had developed a kinetic model for simulating the desulphurization with CaO-based powder injection and the modeling results were in good agreement with part of results

    A Review of Modeling Hot Metal Desulfurization Visuri

    Hot metal desulfurization is commonly conducted in a ladle or a torpedo car, 1 using a desulfurization reagent that is either injected into the metal bath or added on top of it. 2 From the thermodynamic point of view, the fundamental requirement for the desulfurization reagent is to be able to donate electrons and form a new sulfide‐binding phase. 3 Typical reagents used in the industry are

    "Coal desulfurization and demineralization by chemical

    10-11-2014· 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

    (PDF) Effect of Silicon on the Desulfurization of Al

    DOI: 10.1007/s11663-013-9888-7 Ó The Minerals, Metals & Materials Society and ASM International 2013 I. INTRODUCTION was chosen to simulate the industrial conditions for desulfurization, where ladles typically have MgO bricks PART I of this two-part paper presented the back- at the slagline.

    EVALUATION OF LIMESTONE IMPURITIES IN THE

    EVALUATION OF LIMESTONE IMPURITIES IN THE DESULFURIZATION PROCESS OF COAL COMBUSTION GAS. 1 Federal University of Rio Grande do Sul, Av. Osvaldo Aranha, 99/711, CEP: 900135-190, Porto Alegre RS, Brazil. Phone: + 55 51 3308-3594; Fax: + 55 51 3308-3405 E-mail: [email protected]

    Kinetics and detectability of the bridgmanite to post

    12-12-2019· Perrillat, J. P. Kinetics of high-pressure mineral phase transformations using in situ time-resolved x-ray diffraction in the Paris-Edinburgh cell: a practical guide for data acquisition and

    A Mathematical Model of Desulphurization Kinetics for

    In order to clarify the influence of operation conditions on desulphurization kinetics, mathematical models for simulating powder injection desulphurization in RH were proposed by many researchers. 20,21,22,23) Wei et al. 21) had developed a kinetic model for simulating the desulphurization with CaO-based powder injection and the modeling results were in good agreement with part of results

    Review on desulfurization in electroslag remelting

    28-02-2020· Electroslag remelting (ESR) gives a combination of liquid metal refining and solidification structure control. One of the typical aspects of liquid metal refining during ESR for the advanced steel and alloy production is desulfurization. It involves two patterns, i.e., slag–metal reaction and gas–slag reaction (gasifying desulfurization). In this paper, the advances in desulfurization

    Electrochemical behaviors of anode materials and their

    Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (4): 802-810. doi: 10.1016/j.cjche.2018.04.028 • Separation Science and Engineering • Previous Articles Next Articles Electrochemical behaviors of anode materials and their performance for bauxite desulfurization

    A model of carbon dioxide dissolution and mineral

    11-12-2009· 1. Introduction. The quantity of carbon dioxide in the atmosphere has increased by about a third since the start of the Industrial Revolution in the late eighteenth century, from around 280 parts per million by volume (ppmv) in 1850 to around 380 ppmv to date, and is currently rising by about 1.7 ppmv per year ().When carbon dioxide reacts with water, carbonic acid is formed, from which

    An Innovative Modeling Approach for Predicting the

    11-03-2018· The ladle metallurgical furnace (LMF) is one of the most important secondary steel refining equipment to remove inclusions and produce clean low-sulfur

    Flue gas desulphurization Research Papers Academia.edu

    View Flue gas desulphurization Research Papers on Academia.edu for free. The absorption of SO2 from flue gas to counter current falling dispersed drops of liquid phase, chemical equilibria of sulphate (IV), sulphate (VI), Dissolution kinetics of South African coal fly ash and the development of a semi-empirical model to predict dissolution.

    Effect of Flue Gas Desulfurization Gypsum on the

    This work aims to investigate the effect of additional flue gas desulfurization gypsum (FGDG) on the properties of calcium sulfoaluminate cement (CSAC) blended with ground granulated blast furnace slag (GGBFS). The hydration rate, setting time, mechanical strength, pore structure and hydration products of the CSAC-GGBFS mixture containing FGDG were investigated systematically.

    Multimineral reactions controlling secondary phase

    The mineral evolution process has confirmed that dolomite and calcium silicate hydrate (CSH) gel (CSH phases) will dissolve and generate new secondary phases, such as calcite and saponite-K

    Kinetics and detectability of the bridgmanite to post

    12-12-2019· Perrillat, J. P. Kinetics of high-pressure mineral phase transformations using in situ time-resolved x-ray diffraction in the Paris-Edinburgh cell: a practical guide for data acquisition and

    Mineralogical Society of America Geomicrobiology

    Conversely, mineralogical and geochemical factors exert important controls on microbial evolution and the structure of microbial communities. This was the rationale for the Short Course on Geomicrobiology presented by the Mineralogical Society of America on October 18 and 19, 1997, at the Alta Peruvian Lodge in Alta, Utah.