Stability of continuously produced Fe(II)/Fe(III)/As(V) co-precipitates under periodic exposure to reducing agents
•Arsenate co-precipitation with Fe(II) removes 99.9% As during co-precipitation.•Co-precipitation with Fe(II)/As(V)=4 reveal formation of ferrous arsenate.•Ferrous arsenate remains stable until it is oxidized.•Oxidation of Fe(II)–As(V) co-precipitates causes a minor spike in arsenic release.•As is r...
Gespeichert in:
| Veröffentlicht in: | Chemosphere (Oxford) 2015-11, Vol.138, p.239-246 |
|---|---|
| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 246 |
|---|---|
| container_issue | |
| container_start_page | 239 |
| container_title | Chemosphere (Oxford) |
| container_volume | 138 |
| creator | Doerfelt, Christoph Feldmann, Thomas Daenzer, Renaud Demopoulos, George P. |
| description | •Arsenate co-precipitation with Fe(II) removes 99.9% As during co-precipitation.•Co-precipitation with Fe(II)/As(V)=4 reveal formation of ferrous arsenate.•Ferrous arsenate remains stable until it is oxidized.•Oxidation of Fe(II)–As(V) co-precipitates causes a minor spike in arsenic release.•As is re-stabilized after oxidation via re-adsorption or ferric arsenate formation.
Arsenic mobilized during ore processing necessitates its effective removal from process effluents and disposal in environmentally stable tailings. The most common method to accomplish this involves co-precipitation with excess ferric iron during lime neutralization. The precipitates produced are stable under oxic conditions. This may not be true, however, under sub-oxic or anoxic conditions. In this context, the potential stabilizing role of ferrous iron on arsenic removal/retention becomes important. As such, this work investigates the removal and redox stability of arsenic with ferrous, ferric and mixtures of both. The stability of produced solids is monitored in terms of arsenic release over time. It was found that ferrous was very effective for arsenic (V) removal with Fe(II)/As(V)=4, reducing its concentration down to |
| doi_str_mv | 10.1016/j.chemosphere.2015.05.096 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_1778063458</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0045653515005834</els_id><sourcerecordid>1711544274</sourcerecordid><originalsourceid>FETCH-LOGICAL-c560t-b3ad1dcc513384740d380b506de70dac2eb65fb96d1c552df687adb9bd7413a3</originalsourceid><addsrcrecordid>eNqNkUFv1DAQhS0EokvhLyBz2x6yHSexHR-rFYWVKnGg4mo59qT1KhsH20Hdf4_LFsRxpZHe5XtvNPMI-cRgw4CJ6_3GPuIhpPkRI25qYHwDZZR4RVask6pitepekxVAyyvBG35B3qW0Byhmrt6Si1pAJzpQKxK_Z9P70ecjDQO1Ycp-WsKSxiOdY3CLRUdvcb3bXV3_kaI3af3jqqDVHNH62WeTMdFlchjpjNEH5y3FpzmkJSLNgUYsOX56oOYBp5zekzeDGRN-eNFLcn_7-X77tbr79mW3vbmrLBeQq74xjjlrOWuarpUtuKaDnoNwKMEZW2Mv-NAr4ZjlvHaD6KRxveqdbFljmkuyPsWWO34umLI--GRxHM2E5UDNpOxANC3vzkDbEq6AyTNQxnjb1rItqDqhNoaUIg56jv5g4lEz0M896r3-r0f93KOGMkoU78eXNUt_QPfP-be4AmxPAJYP_vIYdbIep1KXL61k7YI_Y81vpSu04w</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1711544274</pqid></control><display><type>article</type><title>Stability of continuously produced Fe(II)/Fe(III)/As(V) co-precipitates under periodic exposure to reducing agents</title><source>MEDLINE</source><source>Elsevier ScienceDirect Journals</source><creator>Doerfelt, Christoph ; Feldmann, Thomas ; Daenzer, Renaud ; Demopoulos, George P.</creator><creatorcontrib>Doerfelt, Christoph ; Feldmann, Thomas ; Daenzer, Renaud ; Demopoulos, George P.</creatorcontrib><description>•Arsenate co-precipitation with Fe(II) removes 99.9% As during co-precipitation.•Co-precipitation with Fe(II)/As(V)=4 reveal formation of ferrous arsenate.•Ferrous arsenate remains stable until it is oxidized.•Oxidation of Fe(II)–As(V) co-precipitates causes a minor spike in arsenic release.•As is re-stabilized after oxidation via re-adsorption or ferric arsenate formation.
Arsenic mobilized during ore processing necessitates its effective removal from process effluents and disposal in environmentally stable tailings. The most common method to accomplish this involves co-precipitation with excess ferric iron during lime neutralization. The precipitates produced are stable under oxic conditions. This may not be true, however, under sub-oxic or anoxic conditions. In this context, the potential stabilizing role of ferrous iron on arsenic removal/retention becomes important. As such, this work investigates the removal and redox stability of arsenic with ferrous, ferric and mixtures of both. The stability of produced solids is monitored in terms of arsenic release over time. It was found that ferrous was very effective for arsenic (V) removal with Fe(II)/As(V)=4, reducing its concentration down to <15ppb via the apparent formation of ferrous arsenate. The presence of Fe(II) seemed to favor an oxidation path toward goethite (and possibly scorodite) formation in the aged bench-scale tailings. When pH and Eh were regularly adjusted with lime and sulfite or sulfide, slightly higher arsenic amounts were released (1–5mgL−1); ferrous again was found to oxidize. Hence, it is concluded that Fe(II)/Fe(III)/As(V) co-precipitates are quite robust against incidental reducing agent exposure.</description><identifier>ISSN: 0045-6535</identifier><identifier>EISSN: 1879-1298</identifier><identifier>DOI: 10.1016/j.chemosphere.2015.05.096</identifier><identifier>PMID: 26086809</identifier><language>eng</language><publisher>England: Elsevier Ltd</publisher><subject>Arsenates - chemistry ; Arsenic ; Arsenicals - chemistry ; Calcium Compounds - chemistry ; Chemical Precipitation ; Continuous co-precipitation ; Effluent treatment ; Exposure ; Ferric Compounds - chemistry ; Ferrous arsenate ; Ferrous Compounds - chemistry ; Formations ; Iron ; Iron Compounds - chemistry ; Lime ; Minerals - chemistry ; Oxidation-Reduction ; Oxides - chemistry ; Reducing agent ; Reducing agents ; Reducing Agents - chemistry ; Stability ; Tailings</subject><ispartof>Chemosphere (Oxford), 2015-11, Vol.138, p.239-246</ispartof><rights>2015 Elsevier Ltd</rights><rights>Copyright © 2015 Elsevier Ltd. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c560t-b3ad1dcc513384740d380b506de70dac2eb65fb96d1c552df687adb9bd7413a3</citedby><cites>FETCH-LOGICAL-c560t-b3ad1dcc513384740d380b506de70dac2eb65fb96d1c552df687adb9bd7413a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0045653515005834$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/26086809$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Doerfelt, Christoph</creatorcontrib><creatorcontrib>Feldmann, Thomas</creatorcontrib><creatorcontrib>Daenzer, Renaud</creatorcontrib><creatorcontrib>Demopoulos, George P.</creatorcontrib><title>Stability of continuously produced Fe(II)/Fe(III)/As(V) co-precipitates under periodic exposure to reducing agents</title><title>Chemosphere (Oxford)</title><addtitle>Chemosphere</addtitle><description>•Arsenate co-precipitation with Fe(II) removes 99.9% As during co-precipitation.•Co-precipitation with Fe(II)/As(V)=4 reveal formation of ferrous arsenate.•Ferrous arsenate remains stable until it is oxidized.•Oxidation of Fe(II)–As(V) co-precipitates causes a minor spike in arsenic release.•As is re-stabilized after oxidation via re-adsorption or ferric arsenate formation.
Arsenic mobilized during ore processing necessitates its effective removal from process effluents and disposal in environmentally stable tailings. The most common method to accomplish this involves co-precipitation with excess ferric iron during lime neutralization. The precipitates produced are stable under oxic conditions. This may not be true, however, under sub-oxic or anoxic conditions. In this context, the potential stabilizing role of ferrous iron on arsenic removal/retention becomes important. As such, this work investigates the removal and redox stability of arsenic with ferrous, ferric and mixtures of both. The stability of produced solids is monitored in terms of arsenic release over time. It was found that ferrous was very effective for arsenic (V) removal with Fe(II)/As(V)=4, reducing its concentration down to <15ppb via the apparent formation of ferrous arsenate. The presence of Fe(II) seemed to favor an oxidation path toward goethite (and possibly scorodite) formation in the aged bench-scale tailings. When pH and Eh were regularly adjusted with lime and sulfite or sulfide, slightly higher arsenic amounts were released (1–5mgL−1); ferrous again was found to oxidize. Hence, it is concluded that Fe(II)/Fe(III)/As(V) co-precipitates are quite robust against incidental reducing agent exposure.</description><subject>Arsenates - chemistry</subject><subject>Arsenic</subject><subject>Arsenicals - chemistry</subject><subject>Calcium Compounds - chemistry</subject><subject>Chemical Precipitation</subject><subject>Continuous co-precipitation</subject><subject>Effluent treatment</subject><subject>Exposure</subject><subject>Ferric Compounds - chemistry</subject><subject>Ferrous arsenate</subject><subject>Ferrous Compounds - chemistry</subject><subject>Formations</subject><subject>Iron</subject><subject>Iron Compounds - chemistry</subject><subject>Lime</subject><subject>Minerals - chemistry</subject><subject>Oxidation-Reduction</subject><subject>Oxides - chemistry</subject><subject>Reducing agent</subject><subject>Reducing agents</subject><subject>Reducing Agents - chemistry</subject><subject>Stability</subject><subject>Tailings</subject><issn>0045-6535</issn><issn>1879-1298</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkUFv1DAQhS0EokvhLyBz2x6yHSexHR-rFYWVKnGg4mo59qT1KhsH20Hdf4_LFsRxpZHe5XtvNPMI-cRgw4CJ6_3GPuIhpPkRI25qYHwDZZR4RVask6pitepekxVAyyvBG35B3qW0Byhmrt6Si1pAJzpQKxK_Z9P70ecjDQO1Ycp-WsKSxiOdY3CLRUdvcb3bXV3_kaI3af3jqqDVHNH62WeTMdFlchjpjNEH5y3FpzmkJSLNgUYsOX56oOYBp5zekzeDGRN-eNFLcn_7-X77tbr79mW3vbmrLBeQq74xjjlrOWuarpUtuKaDnoNwKMEZW2Mv-NAr4ZjlvHaD6KRxveqdbFljmkuyPsWWO34umLI--GRxHM2E5UDNpOxANC3vzkDbEq6AyTNQxnjb1rItqDqhNoaUIg56jv5g4lEz0M896r3-r0f93KOGMkoU78eXNUt_QPfP-be4AmxPAJYP_vIYdbIep1KXL61k7YI_Y81vpSu04w</recordid><startdate>201511</startdate><enddate>201511</enddate><creator>Doerfelt, Christoph</creator><creator>Feldmann, Thomas</creator><creator>Daenzer, Renaud</creator><creator>Demopoulos, George P.</creator><general>Elsevier Ltd</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>7ST</scope><scope>7TG</scope><scope>7U7</scope><scope>C1K</scope><scope>KL.</scope><scope>SOI</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope></search><sort><creationdate>201511</creationdate><title>Stability of continuously produced Fe(II)/Fe(III)/As(V) co-precipitates under periodic exposure to reducing agents</title><author>Doerfelt, Christoph ; Feldmann, Thomas ; Daenzer, Renaud ; Demopoulos, George P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c560t-b3ad1dcc513384740d380b506de70dac2eb65fb96d1c552df687adb9bd7413a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Arsenates - chemistry</topic><topic>Arsenic</topic><topic>Arsenicals - chemistry</topic><topic>Calcium Compounds - chemistry</topic><topic>Chemical Precipitation</topic><topic>Continuous co-precipitation</topic><topic>Effluent treatment</topic><topic>Exposure</topic><topic>Ferric Compounds - chemistry</topic><topic>Ferrous arsenate</topic><topic>Ferrous Compounds - chemistry</topic><topic>Formations</topic><topic>Iron</topic><topic>Iron Compounds - chemistry</topic><topic>Lime</topic><topic>Minerals - chemistry</topic><topic>Oxidation-Reduction</topic><topic>Oxides - chemistry</topic><topic>Reducing agent</topic><topic>Reducing agents</topic><topic>Reducing Agents - chemistry</topic><topic>Stability</topic><topic>Tailings</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Doerfelt, Christoph</creatorcontrib><creatorcontrib>Feldmann, Thomas</creatorcontrib><creatorcontrib>Daenzer, Renaud</creatorcontrib><creatorcontrib>Demopoulos, George P.</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Environment Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Toxicology Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Environment Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Chemosphere (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Doerfelt, Christoph</au><au>Feldmann, Thomas</au><au>Daenzer, Renaud</au><au>Demopoulos, George P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Stability of continuously produced Fe(II)/Fe(III)/As(V) co-precipitates under periodic exposure to reducing agents</atitle><jtitle>Chemosphere (Oxford)</jtitle><addtitle>Chemosphere</addtitle><date>2015-11</date><risdate>2015</risdate><volume>138</volume><spage>239</spage><epage>246</epage><pages>239-246</pages><issn>0045-6535</issn><eissn>1879-1298</eissn><abstract>•Arsenate co-precipitation with Fe(II) removes 99.9% As during co-precipitation.•Co-precipitation with Fe(II)/As(V)=4 reveal formation of ferrous arsenate.•Ferrous arsenate remains stable until it is oxidized.•Oxidation of Fe(II)–As(V) co-precipitates causes a minor spike in arsenic release.•As is re-stabilized after oxidation via re-adsorption or ferric arsenate formation.
Arsenic mobilized during ore processing necessitates its effective removal from process effluents and disposal in environmentally stable tailings. The most common method to accomplish this involves co-precipitation with excess ferric iron during lime neutralization. The precipitates produced are stable under oxic conditions. This may not be true, however, under sub-oxic or anoxic conditions. In this context, the potential stabilizing role of ferrous iron on arsenic removal/retention becomes important. As such, this work investigates the removal and redox stability of arsenic with ferrous, ferric and mixtures of both. The stability of produced solids is monitored in terms of arsenic release over time. It was found that ferrous was very effective for arsenic (V) removal with Fe(II)/As(V)=4, reducing its concentration down to <15ppb via the apparent formation of ferrous arsenate. The presence of Fe(II) seemed to favor an oxidation path toward goethite (and possibly scorodite) formation in the aged bench-scale tailings. When pH and Eh were regularly adjusted with lime and sulfite or sulfide, slightly higher arsenic amounts were released (1–5mgL−1); ferrous again was found to oxidize. Hence, it is concluded that Fe(II)/Fe(III)/As(V) co-precipitates are quite robust against incidental reducing agent exposure.</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>26086809</pmid><doi>10.1016/j.chemosphere.2015.05.096</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0045-6535 |
| ispartof | Chemosphere (Oxford), 2015-11, Vol.138, p.239-246 |
| issn | 0045-6535 1879-1298 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1778063458 |
| source | MEDLINE; Elsevier ScienceDirect Journals |
| subjects | Arsenates - chemistry Arsenic Arsenicals - chemistry Calcium Compounds - chemistry Chemical Precipitation Continuous co-precipitation Effluent treatment Exposure Ferric Compounds - chemistry Ferrous arsenate Ferrous Compounds - chemistry Formations Iron Iron Compounds - chemistry Lime Minerals - chemistry Oxidation-Reduction Oxides - chemistry Reducing agent Reducing agents Reducing Agents - chemistry Stability Tailings |
| title | Stability of continuously produced Fe(II)/Fe(III)/As(V) co-precipitates under periodic exposure to reducing agents |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-29T02%3A18%3A52IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Stability%20of%20continuously%20produced%20Fe(II)/Fe(III)/As(V)%20co-precipitates%20under%20periodic%20exposure%20to%20reducing%20agents&rft.jtitle=Chemosphere%20(Oxford)&rft.au=Doerfelt,%20Christoph&rft.date=2015-11&rft.volume=138&rft.spage=239&rft.epage=246&rft.pages=239-246&rft.issn=0045-6535&rft.eissn=1879-1298&rft_id=info:doi/10.1016/j.chemosphere.2015.05.096&rft_dat=%3Cproquest_cross%3E1711544274%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1711544274&rft_id=info:pmid/26086809&rft_els_id=S0045653515005834&rfr_iscdi=true |