Advances in the chemical leaching (inorgano-leaching), bio-leaching and desulphurisation of coals
| Autor: | Durlubh K. Sharma, Heena Dhawan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
lcsh:TN1-997
Chemical process 020209 energy Alkalis Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology complex mixtures 020401 chemical engineering otorhinolaryngologic diseases 0202 electrical engineering electronic engineering information engineering Coal Desulfurization 0204 chemical engineering lcsh:Mining engineering. Metallurgy Pollutant business.industry technology industry and agriculture Beneficiation respiratory system Geotechnical Engineering and Engineering Geology Pulp and paper industry Sulfur respiratory tract diseases Flue-gas desulfurization chemistry Wastewater Demineralisation Environmental science Leaching (metallurgy) business Acids |
| Zdroj: | International Journal of Coal Science & Technology, Vol 6, Iss 2, Pp 169-183 (2019) |
| ISSN: | 2198-7823 2095-8293 |
| DOI: | 10.1007/s40789-019-0253-6 |
| Popis: | Coal still remains an important source of power generation world over. Along with its usage, comes unwanted generation of noxious gas emissions, toxic metal releases into wastewater and other pollutants which ultimately lead to environmental concerns. So cleaning of coal through physical or chemical processes becomes utmost important. There are several coals which cannot be cleaned by physical beneficiation techniques to produce low ash cleaner coals. Such coals can be cleaned only through chemical cleaning techniques. The present paper reviews the chemical demineralisation and desulphurisation of coals over the years using various inorganic and organic acids, alkalis, oxidants, leachants and various acids and alkali-acid combinations to reduce the ash and sulphur contents in coals. As high as 90% demineralisation and desulfurization could be achieved with the use of these cheap inorganic acids as compared to the expensive solvents used for solvent extraction processes, a parallel approach of cleaning and refining coals. |
| Databáze: | OpenAIRE |
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