Demineralization of low grade coal – A review

Meshram, Pratima; Purohit, Bijoy Kumar; Sinha, Manish Kumar; Sahu, Sushanta Kumar

doi:10.1016/j.rser.2014.08.072

Cited by 152 publications

(88 citation statements)

References 122 publications

(155 reference statements)

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“…The use of low-grade coal in large-scale unit leads to environmental pollution due to generation of the solid wastes and gaseous pollutants. It causes the increase cost of the power plants, reduce the efficiency and produces technical difficulties during processes and production steps (Meshram et al 2015). It is necessary to demineralize and desulphurize such coal before using in thermal power station, steel plants, or cement industries, etc.…”

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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“…As an inexpensive carbonaceous material, lignite is abundant and has low calorific value, high water content and volatile matter content, loose sponge texture and high chemical reactivity [36,37]. It could be a promising precursor for the production of mesoporous ACs.…”

Section: Introductionmentioning

confidence: 99%

Lignite-derived high surface area mesoporous activated carbons for electrochemical capacitors

Xing

Guo

Chen

et al. 2015

Fuel Processing Technology

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“…The notion of recovering nutrients other than sulphur from the leachate of biofilters is not new (Dumont et al 2012a;Jung et al 2005;Rabbani et al 2015;Rabbani et al 2016;Zhang et al 2013). Removal and recovery of elemental sulphur from coal, natural gas and high sulphur crude oils is well-recognised processes, but recovery of sulphur from dilute streams of acid from wastewater treatment plants has not been previously attempted (Babich and Moulijn 2003;Bachmann et al 2014;Jiang et al 2015;Meshram et al 2015;Shu et al 2014). Dilute sulphuric acid solutions produced in industry are concentrated by energy-intensive processes using high-temperature conversion of acid to sulphur dioxide and subsequent catalytic conversion of sulphur dioxide to concentrated sulphuric acid (Smith and Mantius 1978).…”

Section: Introductionmentioning

confidence: 99%

Biofilter for generation of concentrated sulphuric acid from H2S

Rabbani

Charles

Kayaalp

et al. 2016

Environ Sci Pollut Res

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Biofilters are used for the conversion of odorous hydrogen sulphide to odourless sulphate in wastewater treatment plants under the right conditions of moisture and pH. One of the consequences of maintaining the suitable pH and moisture content is the production of large volumes of weakly acidic leachate. This paper presents a biofilter with a maximum H2S elimination capacity of 16.3 g m −3 h −1 and removal efficiency greater than 95 % which produces small volumes (1 mL of solution L −1 of reactor day −1 ) of sulphuric acid with a concentration greater than 5.5 M after 150 days of continuous operation. The concentrated sulphuric acid was produced by intermittently trickling a minimum amount of nutrient solution down the upflow biofilter which created a moisture and pH gradient within the biofilter resulting in an environment at the top for the bacterial conversion of H2S, while sulphuric acid was accumulated at the base. Genetic diversity profiling of samples taken from different sections of the biofilter confirms that the upper sections of the biofilter had the best environment for the bacteria to convert H2S to sulphate. The formation of concentrated sulphuric acid presents an opportunity for the recovery of sulphur from the waste stream as a usable product.

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Demineralization of low grade coal – A review

Cited by 152 publications

References 122 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

Lignite-derived high surface area mesoporous activated carbons for electrochemical capacitors

Biofilter for generation of concentrated sulphuric acid from H2S

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