Effect of H2S concentration in gasified gas on the microstructure and leaching properties of coal slag
•The effects of reducing atmospheres and H2S concentration on microstructure and leaching behavior of gasified slag were investigated.•Adding of H2S causes heavy metals enrichment in the iron phase under a strongly reducing condition.•Heavy metals are easy to co-precipitate with Fe/FeSx in iron phas...
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| Veröffentlicht in: | Fuel (Guildford) 2014-01, Vol.116, p.812-819 |
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| creator | Wei, Yajuan Li, Hanxu Wang, Qunying Honma, Kenichi Yamada, Naoomi Ninomiya, Yoshihiko |
| description | •The effects of reducing atmospheres and H2S concentration on microstructure and leaching behavior of gasified slag were investigated.•Adding of H2S causes heavy metals enrichment in the iron phase under a strongly reducing condition.•Heavy metals are easy to co-precipitate with Fe/FeSx in iron phase.•H2S has no obvious effect on microstructure of slag under a mildly reducing condition.
During coal gasification, the resulting slag varies in the mineral compositions and amount due to the ambient gas in gasifier. In this study, the microstructure and leaching behavior of typical slag were investigated under simulated mildly/strongly reducing gasification conditions with different H2S concentration. XRF, XRD and SEM-EDX were used to study the properties of slag. And ICP-AES was used to determine the metallic ions in acid-digested slag samples. The results indicate that iron phase was separated from molten slag phase in melting process under a strongly reducing condition. In the strongly reducing condition with H2S, FeSx(x |
| doi_str_mv | 10.1016/j.fuel.2013.06.048 |
| format | Article |
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During coal gasification, the resulting slag varies in the mineral compositions and amount due to the ambient gas in gasifier. In this study, the microstructure and leaching behavior of typical slag were investigated under simulated mildly/strongly reducing gasification conditions with different H2S concentration. XRF, XRD and SEM-EDX were used to study the properties of slag. And ICP-AES was used to determine the metallic ions in acid-digested slag samples. The results indicate that iron phase was separated from molten slag phase in melting process under a strongly reducing condition. In the strongly reducing condition with H2S, FeSx(x<1) was formed below about 1200°C and it decomposed to iron liquid when the temperature is above about 1200°C while it takes a long time to reach equilibrium. In the strongly reducing condition, heavy metals, such as Cr, Cu, Ni, Co easily form an interstitial compound in iron phase. Adding of H2S causes heavy metals enrichment in the iron phase, where it has a significant impact on Ni and Cu. On the other hand, addition of H2S has negligible effect on slag properties under mildly reducing condition.</description><identifier>ISSN: 0016-2361</identifier><identifier>EISSN: 1873-7153</identifier><identifier>DOI: 10.1016/j.fuel.2013.06.048</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Applied sciences ; Coal gasification ; Effect of H2S ; Energy ; Energy. Thermal use of fuels ; Exact sciences and technology ; Fe deposition ; Fuels ; Slag leaching</subject><ispartof>Fuel (Guildford), 2014-01, Vol.116, p.812-819</ispartof><rights>2013 Elsevier Ltd</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c400t-8ff7491611b3a1c33ceb5238f3ca8e77a5f97fd95f134a000c23772f1bce5aa33</citedby><cites>FETCH-LOGICAL-c400t-8ff7491611b3a1c33ceb5238f3ca8e77a5f97fd95f134a000c23772f1bce5aa33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.fuel.2013.06.048$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>309,310,314,780,784,789,790,3550,23930,23931,25140,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=27959876$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Wei, Yajuan</creatorcontrib><creatorcontrib>Li, Hanxu</creatorcontrib><creatorcontrib>Wang, Qunying</creatorcontrib><creatorcontrib>Honma, Kenichi</creatorcontrib><creatorcontrib>Yamada, Naoomi</creatorcontrib><creatorcontrib>Ninomiya, Yoshihiko</creatorcontrib><title>Effect of H2S concentration in gasified gas on the microstructure and leaching properties of coal slag</title><title>Fuel (Guildford)</title><description>•The effects of reducing atmospheres and H2S concentration on microstructure and leaching behavior of gasified slag were investigated.•Adding of H2S causes heavy metals enrichment in the iron phase under a strongly reducing condition.•Heavy metals are easy to co-precipitate with Fe/FeSx in iron phase.•H2S has no obvious effect on microstructure of slag under a mildly reducing condition.
During coal gasification, the resulting slag varies in the mineral compositions and amount due to the ambient gas in gasifier. In this study, the microstructure and leaching behavior of typical slag were investigated under simulated mildly/strongly reducing gasification conditions with different H2S concentration. XRF, XRD and SEM-EDX were used to study the properties of slag. And ICP-AES was used to determine the metallic ions in acid-digested slag samples. The results indicate that iron phase was separated from molten slag phase in melting process under a strongly reducing condition. In the strongly reducing condition with H2S, FeSx(x<1) was formed below about 1200°C and it decomposed to iron liquid when the temperature is above about 1200°C while it takes a long time to reach equilibrium. In the strongly reducing condition, heavy metals, such as Cr, Cu, Ni, Co easily form an interstitial compound in iron phase. Adding of H2S causes heavy metals enrichment in the iron phase, where it has a significant impact on Ni and Cu. On the other hand, addition of H2S has negligible effect on slag properties under mildly reducing condition.</description><subject>Applied sciences</subject><subject>Coal gasification</subject><subject>Effect of H2S</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>Fe deposition</subject><subject>Fuels</subject><subject>Slag leaching</subject><issn>0016-2361</issn><issn>1873-7153</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNp9kE1L7DAUhoMoOH78AVfZCHfTmjRN08LdXMR7FQQX6jqcOT0ZM3TauUkq-O9NGXHpKiE85815H8aupCilkM3NtnQzDWUlpCpFU4q6PWIr2RpVGKnVMVuJTBWVauQpO4txK4Qwra5XzN05R5j45Ph99cxxGpHGFCD5aeR-5BuI3nnqlwvPT-mN-M5jmGIKM6Y5EIex5wMBvvlxw_dh2lNInuISiRMMPA6wuWAnDoZIl1_nOXv9e_dye188Pv17uP3zWGAtRCpa50zdyUbKtQKJSiGtdaVapxBaMga064zrO-2kqiGXwEoZUzm5RtIASp2zX4fcvMf_mWKyOx-RhgFGmuZopRZa1a0RIqPVAV3KxEDO7oPfQfiwUthFqt3aRapdpFrR2Cw1D11_5UNEGFyAEX38nqxMp7vWNJn7feAol333FGxET9lt70PWbfvJ__TNJ1ghjcc</recordid><startdate>20140101</startdate><enddate>20140101</enddate><creator>Wei, Yajuan</creator><creator>Li, Hanxu</creator><creator>Wang, Qunying</creator><creator>Honma, Kenichi</creator><creator>Yamada, Naoomi</creator><creator>Ninomiya, Yoshihiko</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>C1K</scope><scope>SOI</scope></search><sort><creationdate>20140101</creationdate><title>Effect of H2S concentration in gasified gas on the microstructure and leaching properties of coal slag</title><author>Wei, Yajuan ; Li, Hanxu ; Wang, Qunying ; Honma, Kenichi ; Yamada, Naoomi ; Ninomiya, Yoshihiko</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c400t-8ff7491611b3a1c33ceb5238f3ca8e77a5f97fd95f134a000c23772f1bce5aa33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Applied sciences</topic><topic>Coal gasification</topic><topic>Effect of H2S</topic><topic>Energy</topic><topic>Energy. Thermal use of fuels</topic><topic>Exact sciences and technology</topic><topic>Fe deposition</topic><topic>Fuels</topic><topic>Slag leaching</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wei, Yajuan</creatorcontrib><creatorcontrib>Li, Hanxu</creatorcontrib><creatorcontrib>Wang, Qunying</creatorcontrib><creatorcontrib>Honma, Kenichi</creatorcontrib><creatorcontrib>Yamada, Naoomi</creatorcontrib><creatorcontrib>Ninomiya, Yoshihiko</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Environment Abstracts</collection><jtitle>Fuel (Guildford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wei, Yajuan</au><au>Li, Hanxu</au><au>Wang, Qunying</au><au>Honma, Kenichi</au><au>Yamada, Naoomi</au><au>Ninomiya, Yoshihiko</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of H2S concentration in gasified gas on the microstructure and leaching properties of coal slag</atitle><jtitle>Fuel (Guildford)</jtitle><date>2014-01-01</date><risdate>2014</risdate><volume>116</volume><spage>812</spage><epage>819</epage><pages>812-819</pages><issn>0016-2361</issn><eissn>1873-7153</eissn><abstract>•The effects of reducing atmospheres and H2S concentration on microstructure and leaching behavior of gasified slag were investigated.•Adding of H2S causes heavy metals enrichment in the iron phase under a strongly reducing condition.•Heavy metals are easy to co-precipitate with Fe/FeSx in iron phase.•H2S has no obvious effect on microstructure of slag under a mildly reducing condition.
During coal gasification, the resulting slag varies in the mineral compositions and amount due to the ambient gas in gasifier. In this study, the microstructure and leaching behavior of typical slag were investigated under simulated mildly/strongly reducing gasification conditions with different H2S concentration. XRF, XRD and SEM-EDX were used to study the properties of slag. And ICP-AES was used to determine the metallic ions in acid-digested slag samples. The results indicate that iron phase was separated from molten slag phase in melting process under a strongly reducing condition. In the strongly reducing condition with H2S, FeSx(x<1) was formed below about 1200°C and it decomposed to iron liquid when the temperature is above about 1200°C while it takes a long time to reach equilibrium. In the strongly reducing condition, heavy metals, such as Cr, Cu, Ni, Co easily form an interstitial compound in iron phase. Adding of H2S causes heavy metals enrichment in the iron phase, where it has a significant impact on Ni and Cu. On the other hand, addition of H2S has negligible effect on slag properties under mildly reducing condition.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.fuel.2013.06.048</doi><tpages>8</tpages></addata></record> |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Applied sciences Coal gasification Effect of H2S Energy Energy. Thermal use of fuels Exact sciences and technology Fe deposition Fuels Slag leaching |
| title | Effect of H2S concentration in gasified gas on the microstructure and leaching properties of coal slag |
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