Chemical cleaning of Turkish lignites by leaching with aqueous hydrogen peroxide

Karaca, Hüseyın; Ceylan, Kadim

doi:10.1016/s0378-3820(96)01042-9

Cited by 43 publications

(30 citation statements)

References 25 publications

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“…They investigated the effect of concentration, contact time and temperature on the removal of ash and sulphur. The demineralization was achieved from 30% to 70% from lignite coal type from the investigation (Karaca and Ceylan 1997). Onal and Ceylan studied six Turkish lignite coal were treated with HCl or EtONa solution at 150°C.…”

Section: Introductionmentioning

confidence: 99%

Demineralization mechanism and influence of parameters on high ash Indian coal by chemical leaching of acid and alkali solution

Behera

Chakraborty

Meikap

2018

Int J Coal Sci Technol

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The current research was investigated the mechanism of coal demineralization and the effect of leaching parameters on high ash coal and study the characterization of pre and post-treated coal. The two high ash Indian coal selected from Mahanadi Coalfield Limited, Odisha, pulverized to 375, 230 and 180 lm particle size were undergone simultaneous acid and alkali treatment at a different concentration, temperature and time. The percent demineralization was increased with decrease the size of the particle and rises with leaching parameters. The investigation suggested 180 lm particle size offers efficient demineralization for both coals at 30% NaOH and 30% H 2 SO 4 concentration. The alkali leaching leads to obtaining the demineralization 46% and 42% whereas acid treatment resulted in 34% and 32% of the original coal samples. The extent of demineralization was improved the calorific value of coal. Besides, the degree of demineralization was proved from the FTIR, XRF and FESEM-EDX analysis results. FTIR analysis result showed that the peak intensity of mineral band decreased by the leaching effect and the degree of demineralization was significantly obtained to large extent by the X-ray Fluorescence spectrometer; which elucidates major minerals removed from coal by the leaching effect of acid and alkali solution.

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Section: Introductionmentioning

confidence: 99%

Demineralization mechanism and influence of parameters on high ash Indian coal by chemical leaching of acid and alkali solution

Behera

Chakraborty

Meikap

2018

Int J Coal Sci Technol

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“…Well known desulfurization processes include caustic treatment (NaOH, KOH, CaOH vs), acidic treatment (HCl, HNO 3 , H 2 SO 4 , HF, H 2 O 2 vs) and thermal treatment [1,18,22,[24][25][26][27][28]. Thermal treatment can be used efficiently for desulfurization of coals by both removal of organic sulfur species and pyrite decomposition prior to combustion.…”

Section: Chemical Desulfurizationmentioning

confidence: 99%

Characterization and Desulfurization Possibilities of High Sulfur Gediz-Turkey Coal

Demir¹

2017

JESE-A

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Abstract:Coal is one of the important energy sources, but it causes serious environmental problems such as air pollution, acid rain and greenhouse effects. Sulfur in coal is one of the responsibilities of these negative effects. Coal includes two types of sulfur: organic and inorganic. While inorganic sulfur can be completely removed with physical desulfurization methods, organic sulfur can be removed only by chemical desulfurization methods. But chemical methods are not only expensive but also difficult processes. Firstly in desulfurization, types of the sulfur content in coal should be well characterized. High sulfur Gediz-Turkey coal has been chosen to this study. This coal basin is located in the centre of the Turkey. In this study, characterization and desulfurization possibilities of high sulfur Gediz coal were investigated. For this purpose, several physical and chemical characterization methods such as proximate and ultimate coal analysis (ash, calorific value, volatile matter, moisture and sulfur analysis), mineralogical and petrographic analysis, fourier transform infrared spectroscopy, scanning electron microscope were used. Results of these analysis are shown that Gediz coals include 3.15% pyritic sulfur and 2.89% organic sulfur. Removing pyritic sulfur from Gediz-Turkey coal with physical methods such as gravity and sink-float separation is not possible because pyrite particle has 1-2 micron liberation size in coal.

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“…Basic solutions, such as NaOH, KOH, Ca(OH) 2 , or acidic solutions such as HF, HCl, H 2 SO 4 , HNO 3 , as well as H 2 O 2 and combinations of all these chemicals have been attempted to remove the undesired minerals [16]. Besides methods like physical, biological and chemical, solvent extraction, thermal, nuclear, oxidation, electrochemical, alkali and hydrodesulfurization are also reported for demineralization and desulfurization of the coals [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The effectiveness of these methods depends on the type of coal and the sulfur content.…”

Section: Demineralization/desulfurization Of Coalsmentioning

confidence: 99%

“…The effectiveness of these methods depends on the type of coal and the sulfur content. Much research has been carried out on desulfurization/demineralization via chemical methods [23,26,29]. The reagent type must be selected with the aim of an effective desulfurization and demineralization.…”

Section: Demineralization/desulfurization Of Coalsmentioning

confidence: 99%

Demineralization of low grade coal – A review

Meshram

Purohit

Sinha

et al. 2015

Renewable and Sustainable Energy Reviews

149

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Chemical cleaning of Turkish lignites by leaching with aqueous hydrogen peroxide

Cited by 43 publications

References 25 publications

Demineralization mechanism and influence of parameters on high ash Indian coal by chemical leaching of acid and alkali solution

Demineralization mechanism and influence of parameters on high ash Indian coal by chemical leaching of acid and alkali solution

Characterization and Desulfurization Possibilities of High Sulfur Gediz-Turkey Coal

Demineralization of low grade coal – A review

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