Upgrading of Kutahya region lignites by mild pyrolysis and high intensity dry magnetic separation

Koca, Hüseyin; Koca, Sabiha; Koçkar, Ömer Mete

doi:10.1016/s0892-6875(00)00047-9

Cited by 15 publications

(12 citation statements)

References 7 publications

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“…Both the total sulfur and organic sulfur could be rejected into the tailings. The devolatalization and desulfurization of lignite (KutahyaSeyitomer Power Plant) are investigated by means of mild pyrolysis followed by High Dry Magnetic Separation [69]. The mild pyrolysis experiments were conducted in a modified Heinze Retort and the magnetic separation was achieved in a Permroll HIDM separator.…”

Section: Magnetic Separationmentioning

confidence: 99%

Recent advances in beneficiation for low rank coals

2015

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Section: Magnetic Separationmentioning

confidence: 99%

Recent advances in beneficiation for low rank coals

2015

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“…The slow pyrolysis experiments were performed in a modified Heinze Retort. The experimental set and the procedure were explained in details elsewhere (Koca et al, 2000). The experimental sets, used for the fast and flash pyrolysis, consisted of a heating unit, control and display unit and liquid product collecting unit.…”

Section: Pyrolysis Experimentsmentioning

confidence: 99%

“…The increasing concern over environmental effects of volatile matter, released from the combustion of fossil fuels, resulted in a number of researches to obtain clean coal (Yildirim et al, 1996;Renda et al, 1998;Koca et al, 2000). Devolatalization of coals is obtained by pyrolysis and semi-coking techniques.…”

Section: Introductionmentioning

confidence: 99%

“…The organic and inorganic sulphur undergo significant changes during the pyrolysis process Qi et al, 2004). In pyrolysis, pyrite (FeS 2 ) transforms various sulphides at temperature above 350 ı C. The nascent sulphur is reported to be very active, and it captures hydrogen from coal to form H 2 S that converts to gas or is captured by organic matrix to form organic sulphur that remains in char or tar, or is fixed by mineral matters in coal, mainly calcium, sodium or iron compounds, to form sulphides that remains in char (Gryglewicz, 1995;Chen et al, 1998;Koca et al, 2000;Chen et al, 2000;Hu et al, 2004). It was reported in the literature that at 400 ı C and 450 ı C some of the pyrite is converted to ferrimagnetic pyrrhotite (Fe 7 S 8 ) (Gryglewicz et al, 1996;Chen et al, 2000;Liu et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Despite the fact that desulphurization studies on the same region lignites by slow pyrolysis have been carried out (Koca et al, 2000), the objective of this study is to investigate the desulphurization tendency and behavior of Kutahya-Seyitomer region lignites during fast, flash and slow pyrolysis. A comparison of results was also included.…”

Section: Introductionmentioning

confidence: 99%

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Desulphurization of Lignites by Slow, Fast, and Flash Pyrolysis and High Intensity Dry Magnetic Separation

Koca

Koçkar

Koca

2007

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Slow, fast and flash pyrolysis followed by high intensity dry magnetic (HIDM) separation experiments were conducted to obtain improved solid fuels. Pyrolysis experiments were performed in three different apparatus, and important parameters of processes, temperature, particle size, residence time and heating rate were studied to determine the optimum conditions. Desulphurization of lignites by flash pyrolysis is more successful than slow and fast pyrolysis. At optimum conditions of pyrolysis, up to 58.15, 60.24, and 62.31% sulphur reductions were obtained in slow, fast and flash pyrolysis, respectively. Char, obtained from the pyrolysis experiments, was further cleaned by a Permroll HIDM separator. Sulphur reduction enhanced up to 82.68, 84.40, and 86.55% in the char of slow, fast and flash pyrolysis, respectively.

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Physical Concentration of Heavy Minerals: A Brief Review on Low and High Intensity Magnetic Separation Process Techniques

Nzeh,

Popoola,

Adeleke

et al. 2023

JOM

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Choice selection and application variation of physical beneficiation techniques usually employed on heavy minerals (HMs) depends greatly on mineralogy, composition, shape, particle size distribution, and physicochemical properties of the minerals. Recent advancements in the applications of HM products by modern science, engineering, technological, and metallurgical production industries, especially in the demand by nuclear and power industries, have significantly increased over the decades. This is the reason for the criticality and commerciality of HM products, which has necessitated their high demand by various industries. The recovery of HMs, such as Zr, Hf, Ti, V, Sn, Pb, Cu, Zn, Fe, Mn, Nb, Ta, and REE associated minerals, from their deposits is dependent on the extractive metallurgy of transition and refractory metals from their complex minerals. However, based on the mineral concentration effectiveness, as well as the metal extraction efficiency, several challenges have been encountered in their recovery and separation from associated impurities. On this premise, this brief review is focused on investigating magnetic separation process applications in the beneficiation/recovery of HMs. This will serve as a tool for efficient mineral concentration and upgrade as well as reducing the process steps and extraction complexity involved in the downstream measures of dissolution/decomposition and pyro-hydrometallurgical separation processes.

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Upgrading of Kutahya region lignites by mild pyrolysis and high intensity dry magnetic separation

Cited by 15 publications

References 7 publications

Recent advances in beneficiation for low rank coals

Recent advances in beneficiation for low rank coals

Desulphurization of Lignites by Slow, Fast, and Flash Pyrolysis and High Intensity Dry Magnetic Separation

Physical Concentration of Heavy Minerals: A Brief Review on Low and High Intensity Magnetic Separation Process Techniques

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