Desulphurization of coals of different ranks in the presence of slimes by reverse flotation

Zhou, You; Albijanic, Boris; Tadesse, Bogale; Wang, Yuling; Yang, Junxiao; Zhu, Xiangnan

doi:10.1016/j.egyr.2019.09.003

Cited by 12 publications

(4 citation statements)

References 34 publications

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“…The inorganic forms of the sulfur present in coal are usually sulfates and sulfides, where pyrite being as the major inorganic sulfur in most coals. The inorganic sulfur components in the coal are determined by the analytical methods and several commercial methods exist for the removal of much of the inorganic sulfur from the coal [10], [11]. The organic sulfur present in coal is the macromolecular assemblies' structures and are not readily analyzed or separated without the destruction of macromolecular network.…”

Section: Desulfurization Of Mach Coal Of Balochistan By Leaching Methods [64]mentioning

confidence: 99%

Desulfurization of Mach Coal of Balochistan by Leaching Method

Mushtaq¹,

Ullah²,

Khan³

et al. 2021

Journal of Applied and Emerging Sciences

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Coal desulfurization prior to usage is frequently subjected to preprocessing to achieve clean fuel and reduce environmental impacts. In this study, desulfurization of Mach coal of Balochistan was investigated with different leaching solvents. The solvents used are NaOH and HNO3. Effects of particle size and solvent weight% on sulfur removal were studied, whereas the leaching temperature and the agitation time were kept constant. Desulfurization experiments were carried out for 12 samples of different composition based on different particle size and solvent weight%. Significant reduction in Sulfur was attained when the coal particle size of 10 Mesh was used. The results indicated that Sulfur reduction was highest of 44.88% when HNO3 was used as compare to NaOH which gave maximum Sulfur reduction of 24.72%. Sulfur recovery was found to increase with increasing solvent concentration. Decreased desulfurization was observed with larger coal particle size of 6 Mesh. Leaching process using variable solvent concentration was found effective and could be inexpensive for desulfurization of coal.

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Section: Desulfurization Of Mach Coal Of Balochistan By Leaching Methods [64]mentioning

confidence: 99%

Desulfurization of Mach Coal of Balochistan by Leaching Method

Mushtaq¹,

Ullah²,

Khan³

et al. 2021

Journal of Applied and Emerging Sciences

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“…This is a recent process that has been proposed for the treatment of difficult carbonate-containingiron ores. [33] This process combines multiple flotation techniques into a single methodology.…”

Section: Stepped Flotationmentioning

confidence: 99%

Froth flotation process and its application

Mondal

Acharjee

Mandal

et al. 2021

Vietnam Journal of Chemistry

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The paper is about the froth flotation process and its application. It is a metallurgical process for the extraction of metals in a pure state from their ores: especially for sulfide ores. Froth flotation is one of the steps which is generally performed before roasting and it deals with the surface chemistry of liquids and of the minerals to be separated. This process requires a particular setup to be performed which contains different components. Surfactants play the most important role here. Different types of surfactants are used in different ways and each of them plays a crucial role like, collectors, frothers, froth stabilizers, depressants and activators, pH regulators etc. The sulfide ore flotation process can be studied by both chemical and electrochemical phenomena considering the interfacial energies. A broad application of this process in industrial field is the flotation of iron ores which is of two types: direct and reverse flotation. The later one is again based on two different types as cationic and anionic reverse flotation. In all these processes different types of flotation reagents are used. Another application is separation of malachite and azurite ore using sulfidization flotation.

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“…The type of coal liquefaction residue is similar to the type of sulfur in coal, so the coal liquefaction residue can also be studied according to the research method of sulfur in coal. Currently, the desulfurization technologies suitable for coal can generally be divided into physical desulfurization [ 19 ], chemical desulfurization [ 20 ] and biological desulfurization [ 21 ]. Traditional physical desulfurization methods, such as flotation technology, can only remove part of the inorganic sulfur in coal, and then, organic sulfur cannot be removed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Electrochemical Desulfurization of Coal Liquefaction Residue

Jiang

Zhang

et al. 2023

Molecules

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The occurrence of sulfur in coal direct liquefaction residue affects its further high quality and high value utilization. Electrochemical desulfurization is characterized by mild reaction conditions, simple operation, easy separation of sulfur conversion products and little influence on the properties of the liquefied residue. An anodic electrolytic oxidation desulphurization experiment was carried out on the liquefaction residue of the by-product of a coal-to-liquid enterprise in the slurry state. An electrochemical test and material characterization of raw materials before and after electrolysis showed that electrolytic oxidation can desulfurize the liquefaction residue under an alkaline condition. Linear sweep voltammetry (LSV) was used for the electrolysis experiments to obtain the optimal slurry concentration of 60 g/L. On this basis, the reaction kinetics were calculated, and the minimum activation energy in the interval at 0.9 (V vs. Hg/HgO) was 19.71 kJ/mol. The relationship between the electrolytic desulfurization of the liquefied residue and energy consumption was studied by the potentiostatic method. The influence of anodic potential and electrolytic temperature on the current density, cell voltage, desulfurization rate and energy consumption was investigated. The experimental results showed that the desulfurization rate and total energy consumption increase positively with the increase in reaction temperature and electrolytic potential in a certain range. The influence of the reaction temperature on the desulfurization rate and total energy consumption is more prominent than that of electrolytic potential, but the energy consumption of sulfur removal per unit mass does not show a positive correlation. Therefore, with the energy consumption per unit mass of sulfur removal as the efficiency index, the optimal experimental results were obtained: under the conditions of 0.8 (V vs. Hg/HgO) anode potential, 50 °C electrolytic temperature, 60 g/L slurry concentration and 14,400 s electrolytic time, the desulfurization rate was 18.85%, and the power consumption per unit mass of sulfur removal was 5585.74 W·s/g. The results of XPS, SEM, BET and IC showed that both inorganic and organic sulfur were removed by electrolytic oxidation, and the morphology, pore structure and chemical bond of the liquefied residue were affected by electrolytic oxidation. The research method provides a new idea and reference for the efficiency evaluation of desulfurization and hydrogen production from coal liquefaction residue.

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Desulphurization of coals of different ranks in the presence of slimes by reverse flotation

Cited by 12 publications

References 34 publications

Desulfurization of Mach Coal of Balochistan by Leaching Method

Desulfurization of Mach Coal of Balochistan by Leaching Method

Froth flotation process and its application

Experimental Study on Electrochemical Desulfurization of Coal Liquefaction Residue

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