An

The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with ar...
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Gespeichert in:

Autor*in:	Chen, Miao [verfasserIn] Yang, Yi [verfasserIn] Liu, Weihua [verfasserIn] Wang, Chun [verfasserIn] Johannessen, Bernt [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2017

Schlagwörter:	Arsenopyrite Pressure leaching Arsenic speciation and oxidation state

Übergeordnetes Werk:	Enthalten in: Hydrometallurgy - Amsterdam [u.a.] : Elsevier Science, 1975, 175, Seite 11-19
Übergeordnetes Werk:	volume:175 ; pages:11-19

DOI / URN:	10.1016/j.hydromet.2017.10.016

Katalog-ID:	ELV000520179

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520			\|a The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with arsenopyrite) existed as As(V) at room temperature. As(III) appeared increasingly with temperature rising from 100°C and eventually, at temperatures greater than 200°C, only As(III) was detected. The process was reversible in that the arsenic in solution was re-oxidized to As(V) during cooling. The addition of Fe3+ favored the presence of As(V) in solution. Higher initial ferric concentration required a higher temperature for the formation of As(III) and profoundly reduced the reduction rate of As(V) and enhanced the re-oxidation rate of As(III). Compared to pure oxygen, As(III) was more readily stabilized in leaching solutions using compressed air. The EXAFS data show that the As(V) in solution was coordinated with 4.1 oxygen atoms in the first shell with an average distance of 1.71Å, which indicates the presence of H3AsO4 or its deprotonated forms. Meanwhile As(III) in solution (at 225°C) was coordinated with 3.1 oxygen atoms in the first shell with an average distance of 1.80Å, suggesting the presence of H3AsO3. It is concluded that the identified As(III) species in the leaching solution at elevated temperature has a significant impact on the reaction chemistry of acid pressure leaching for As-bearing sulfide.
650		4	\|a Arsenopyrite
650		4	\|a Pressure leaching
650		4	\|a Arsenic speciation and oxidation state
700	1		\|a Yang, Yi \|e verfasserin \|4 aut
700	1		\|a Liu, Weihua \|e verfasserin \|4 aut
700	1		\|a Wang, Chun \|e verfasserin \|4 aut
700	1		\|a Johannessen, Bernt \|e verfasserin \|0 (orcid)0000-0002-3027-0816 \|4 aut
773	0	8	\|i Enthalten in \|t Hydrometallurgy \|d Amsterdam [u.a.] : Elsevier Science, 1975 \|g 175, Seite 11-19 \|h Online-Ressource \|w (DE-627)323606237 \|w (DE-600)2026214-0 \|w (DE-576)259271950 \|x 0304-386X \|7 nnns
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936	b	k	\|a 58.41 \|j Hüttenwesen
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author_variant	m c mc y y yy w l wl c w cw b j bj
matchkey_str	article:0304386X:2017----::
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publishDate	2017
allfields	10.1016/j.hydromet.2017.10.016 doi (DE-627)ELV000520179 (ELSEVIER)S0304-386X(17)30281-5 DE-627 ger DE-627 rda eng 670 DE-600 58.41 bkl Chen, Miao verfasserin aut An 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with arsenopyrite) existed as As(V) at room temperature. As(III) appeared increasingly with temperature rising from 100°C and eventually, at temperatures greater than 200°C, only As(III) was detected. The process was reversible in that the arsenic in solution was re-oxidized to As(V) during cooling. The addition of Fe3+ favored the presence of As(V) in solution. Higher initial ferric concentration required a higher temperature for the formation of As(III) and profoundly reduced the reduction rate of As(V) and enhanced the re-oxidation rate of As(III). Compared to pure oxygen, As(III) was more readily stabilized in leaching solutions using compressed air. The EXAFS data show that the As(V) in solution was coordinated with 4.1 oxygen atoms in the first shell with an average distance of 1.71Å, which indicates the presence of H3AsO4 or its deprotonated forms. Meanwhile As(III) in solution (at 225°C) was coordinated with 3.1 oxygen atoms in the first shell with an average distance of 1.80Å, suggesting the presence of H3AsO3. It is concluded that the identified As(III) species in the leaching solution at elevated temperature has a significant impact on the reaction chemistry of acid pressure leaching for As-bearing sulfide. Arsenopyrite Pressure leaching Arsenic speciation and oxidation state Yang, Yi verfasserin aut Liu, Weihua verfasserin aut Wang, Chun verfasserin aut Johannessen, Bernt verfasserin (orcid)0000-0002-3027-0816 aut Enthalten in Hydrometallurgy Amsterdam [u.a.] : Elsevier Science, 1975 175, Seite 11-19 Online-Ressource (DE-627)323606237 (DE-600)2026214-0 (DE-576)259271950 0304-386X nnns volume:175 pages:11-19 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 58.41 Hüttenwesen AR 175 11-19
spelling	10.1016/j.hydromet.2017.10.016 doi (DE-627)ELV000520179 (ELSEVIER)S0304-386X(17)30281-5 DE-627 ger DE-627 rda eng 670 DE-600 58.41 bkl Chen, Miao verfasserin aut An 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with arsenopyrite) existed as As(V) at room temperature. As(III) appeared increasingly with temperature rising from 100°C and eventually, at temperatures greater than 200°C, only As(III) was detected. The process was reversible in that the arsenic in solution was re-oxidized to As(V) during cooling. The addition of Fe3+ favored the presence of As(V) in solution. Higher initial ferric concentration required a higher temperature for the formation of As(III) and profoundly reduced the reduction rate of As(V) and enhanced the re-oxidation rate of As(III). Compared to pure oxygen, As(III) was more readily stabilized in leaching solutions using compressed air. The EXAFS data show that the As(V) in solution was coordinated with 4.1 oxygen atoms in the first shell with an average distance of 1.71Å, which indicates the presence of H3AsO4 or its deprotonated forms. Meanwhile As(III) in solution (at 225°C) was coordinated with 3.1 oxygen atoms in the first shell with an average distance of 1.80Å, suggesting the presence of H3AsO3. It is concluded that the identified As(III) species in the leaching solution at elevated temperature has a significant impact on the reaction chemistry of acid pressure leaching for As-bearing sulfide. Arsenopyrite Pressure leaching Arsenic speciation and oxidation state Yang, Yi verfasserin aut Liu, Weihua verfasserin aut Wang, Chun verfasserin aut Johannessen, Bernt verfasserin (orcid)0000-0002-3027-0816 aut Enthalten in Hydrometallurgy Amsterdam [u.a.] : Elsevier Science, 1975 175, Seite 11-19 Online-Ressource (DE-627)323606237 (DE-600)2026214-0 (DE-576)259271950 0304-386X nnns volume:175 pages:11-19 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 58.41 Hüttenwesen AR 175 11-19
allfields_unstemmed	10.1016/j.hydromet.2017.10.016 doi (DE-627)ELV000520179 (ELSEVIER)S0304-386X(17)30281-5 DE-627 ger DE-627 rda eng 670 DE-600 58.41 bkl Chen, Miao verfasserin aut An 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with arsenopyrite) existed as As(V) at room temperature. As(III) appeared increasingly with temperature rising from 100°C and eventually, at temperatures greater than 200°C, only As(III) was detected. The process was reversible in that the arsenic in solution was re-oxidized to As(V) during cooling. The addition of Fe3+ favored the presence of As(V) in solution. Higher initial ferric concentration required a higher temperature for the formation of As(III) and profoundly reduced the reduction rate of As(V) and enhanced the re-oxidation rate of As(III). Compared to pure oxygen, As(III) was more readily stabilized in leaching solutions using compressed air. The EXAFS data show that the As(V) in solution was coordinated with 4.1 oxygen atoms in the first shell with an average distance of 1.71Å, which indicates the presence of H3AsO4 or its deprotonated forms. Meanwhile As(III) in solution (at 225°C) was coordinated with 3.1 oxygen atoms in the first shell with an average distance of 1.80Å, suggesting the presence of H3AsO3. It is concluded that the identified As(III) species in the leaching solution at elevated temperature has a significant impact on the reaction chemistry of acid pressure leaching for As-bearing sulfide. Arsenopyrite Pressure leaching Arsenic speciation and oxidation state Yang, Yi verfasserin aut Liu, Weihua verfasserin aut Wang, Chun verfasserin aut Johannessen, Bernt verfasserin (orcid)0000-0002-3027-0816 aut Enthalten in Hydrometallurgy Amsterdam [u.a.] : Elsevier Science, 1975 175, Seite 11-19 Online-Ressource (DE-627)323606237 (DE-600)2026214-0 (DE-576)259271950 0304-386X nnns volume:175 pages:11-19 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 58.41 Hüttenwesen AR 175 11-19
allfieldsGer	10.1016/j.hydromet.2017.10.016 doi (DE-627)ELV000520179 (ELSEVIER)S0304-386X(17)30281-5 DE-627 ger DE-627 rda eng 670 DE-600 58.41 bkl Chen, Miao verfasserin aut An 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with arsenopyrite) existed as As(V) at room temperature. As(III) appeared increasingly with temperature rising from 100°C and eventually, at temperatures greater than 200°C, only As(III) was detected. The process was reversible in that the arsenic in solution was re-oxidized to As(V) during cooling. The addition of Fe3+ favored the presence of As(V) in solution. Higher initial ferric concentration required a higher temperature for the formation of As(III) and profoundly reduced the reduction rate of As(V) and enhanced the re-oxidation rate of As(III). Compared to pure oxygen, As(III) was more readily stabilized in leaching solutions using compressed air. The EXAFS data show that the As(V) in solution was coordinated with 4.1 oxygen atoms in the first shell with an average distance of 1.71Å, which indicates the presence of H3AsO4 or its deprotonated forms. Meanwhile As(III) in solution (at 225°C) was coordinated with 3.1 oxygen atoms in the first shell with an average distance of 1.80Å, suggesting the presence of H3AsO3. It is concluded that the identified As(III) species in the leaching solution at elevated temperature has a significant impact on the reaction chemistry of acid pressure leaching for As-bearing sulfide. Arsenopyrite Pressure leaching Arsenic speciation and oxidation state Yang, Yi verfasserin aut Liu, Weihua verfasserin aut Wang, Chun verfasserin aut Johannessen, Bernt verfasserin (orcid)0000-0002-3027-0816 aut Enthalten in Hydrometallurgy Amsterdam [u.a.] : Elsevier Science, 1975 175, Seite 11-19 Online-Ressource (DE-627)323606237 (DE-600)2026214-0 (DE-576)259271950 0304-386X nnns volume:175 pages:11-19 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 58.41 Hüttenwesen AR 175 11-19
allfieldsSound	10.1016/j.hydromet.2017.10.016 doi (DE-627)ELV000520179 (ELSEVIER)S0304-386X(17)30281-5 DE-627 ger DE-627 rda eng 670 DE-600 58.41 bkl Chen, Miao verfasserin aut An 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with arsenopyrite) existed as As(V) at room temperature. As(III) appeared increasingly with temperature rising from 100°C and eventually, at temperatures greater than 200°C, only As(III) was detected. The process was reversible in that the arsenic in solution was re-oxidized to As(V) during cooling. The addition of Fe3+ favored the presence of As(V) in solution. Higher initial ferric concentration required a higher temperature for the formation of As(III) and profoundly reduced the reduction rate of As(V) and enhanced the re-oxidation rate of As(III). Compared to pure oxygen, As(III) was more readily stabilized in leaching solutions using compressed air. The EXAFS data show that the As(V) in solution was coordinated with 4.1 oxygen atoms in the first shell with an average distance of 1.71Å, which indicates the presence of H3AsO4 or its deprotonated forms. Meanwhile As(III) in solution (at 225°C) was coordinated with 3.1 oxygen atoms in the first shell with an average distance of 1.80Å, suggesting the presence of H3AsO3. It is concluded that the identified As(III) species in the leaching solution at elevated temperature has a significant impact on the reaction chemistry of acid pressure leaching for As-bearing sulfide. Arsenopyrite Pressure leaching Arsenic speciation and oxidation state Yang, Yi verfasserin aut Liu, Weihua verfasserin aut Wang, Chun verfasserin aut Johannessen, Bernt verfasserin (orcid)0000-0002-3027-0816 aut Enthalten in Hydrometallurgy Amsterdam [u.a.] : Elsevier Science, 1975 175, Seite 11-19 Online-Ressource (DE-627)323606237 (DE-600)2026214-0 (DE-576)259271950 0304-386X nnns volume:175 pages:11-19 GBV_USEFLAG_U SYSFLAG_U GBV_ELV GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_187 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 58.41 Hüttenwesen AR 175 11-19
language	English
source	Enthalten in Hydrometallurgy 175, Seite 11-19 volume:175 pages:11-19
sourceStr	Enthalten in Hydrometallurgy 175, Seite 11-19 volume:175 pages:11-19
format_phy_str_mv	Article
bklname	Hüttenwesen
institution	findex.gbv.de
topic_facet	Arsenopyrite Pressure leaching Arsenic speciation and oxidation state
dewey-raw	670
isfreeaccess_bool	false
container_title	Hydrometallurgy
authorswithroles_txt_mv	Chen, Miao @@aut@@ Yang, Yi @@aut@@ Liu, Weihua @@aut@@ Wang, Chun @@aut@@ Johannessen, Bernt @@aut@@
publishDateDaySort_date	2017-01-01T00:00:00Z
hierarchy_top_id	323606237
dewey-sort	3670
id	ELV000520179
language_de	englisch
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author	Chen, Miao
spellingShingle	Chen, Miao ddc 670 bkl 58.41 misc Arsenopyrite misc Pressure leaching misc Arsenic speciation and oxidation state An
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topic_title	670 DE-600 58.41 bkl An Arsenopyrite Pressure leaching Arsenic speciation and oxidation state
topic	ddc 670 bkl 58.41 misc Arsenopyrite misc Pressure leaching misc Arsenic speciation and oxidation state
topic_unstemmed	ddc 670 bkl 58.41 misc Arsenopyrite misc Pressure leaching misc Arsenic speciation and oxidation state
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abstract	The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with arsenopyrite) existed as As(V) at room temperature. As(III) appeared increasingly with temperature rising from 100°C and eventually, at temperatures greater than 200°C, only As(III) was detected. The process was reversible in that the arsenic in solution was re-oxidized to As(V) during cooling. The addition of Fe3+ favored the presence of As(V) in solution. Higher initial ferric concentration required a higher temperature for the formation of As(III) and profoundly reduced the reduction rate of As(V) and enhanced the re-oxidation rate of As(III). Compared to pure oxygen, As(III) was more readily stabilized in leaching solutions using compressed air. The EXAFS data show that the As(V) in solution was coordinated with 4.1 oxygen atoms in the first shell with an average distance of 1.71Å, which indicates the presence of H3AsO4 or its deprotonated forms. Meanwhile As(III) in solution (at 225°C) was coordinated with 3.1 oxygen atoms in the first shell with an average distance of 1.80Å, suggesting the presence of H3AsO3. It is concluded that the identified As(III) species in the leaching solution at elevated temperature has a significant impact on the reaction chemistry of acid pressure leaching for As-bearing sulfide.
abstractGer	The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with arsenopyrite) existed as As(V) at room temperature. As(III) appeared increasingly with temperature rising from 100°C and eventually, at temperatures greater than 200°C, only As(III) was detected. The process was reversible in that the arsenic in solution was re-oxidized to As(V) during cooling. The addition of Fe3+ favored the presence of As(V) in solution. Higher initial ferric concentration required a higher temperature for the formation of As(III) and profoundly reduced the reduction rate of As(V) and enhanced the re-oxidation rate of As(III). Compared to pure oxygen, As(III) was more readily stabilized in leaching solutions using compressed air. The EXAFS data show that the As(V) in solution was coordinated with 4.1 oxygen atoms in the first shell with an average distance of 1.71Å, which indicates the presence of H3AsO4 or its deprotonated forms. Meanwhile As(III) in solution (at 225°C) was coordinated with 3.1 oxygen atoms in the first shell with an average distance of 1.80Å, suggesting the presence of H3AsO3. It is concluded that the identified As(III) species in the leaching solution at elevated temperature has a significant impact on the reaction chemistry of acid pressure leaching for As-bearing sulfide.
abstract_unstemmed	The evolution of oxidation state of aqueous arsenic (As) under the condition of acid pressure leaching was investigated for the first time by in-situ synchrotron X-ray absorption spectroscopy (XAS). At an oxygen pressure of 28bar, the dissolved As in leaching solutions (0.5M H2SO4 coexisting with arsenopyrite) existed as As(V) at room temperature. As(III) appeared increasingly with temperature rising from 100°C and eventually, at temperatures greater than 200°C, only As(III) was detected. The process was reversible in that the arsenic in solution was re-oxidized to As(V) during cooling. The addition of Fe3+ favored the presence of As(V) in solution. Higher initial ferric concentration required a higher temperature for the formation of As(III) and profoundly reduced the reduction rate of As(V) and enhanced the re-oxidation rate of As(III). Compared to pure oxygen, As(III) was more readily stabilized in leaching solutions using compressed air. The EXAFS data show that the As(V) in solution was coordinated with 4.1 oxygen atoms in the first shell with an average distance of 1.71Å, which indicates the presence of H3AsO4 or its deprotonated forms. Meanwhile As(III) in solution (at 225°C) was coordinated with 3.1 oxygen atoms in the first shell with an average distance of 1.80Å, suggesting the presence of H3AsO3. It is concluded that the identified As(III) species in the leaching solution at elevated temperature has a significant impact on the reaction chemistry of acid pressure leaching for As-bearing sulfide.
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up_date	2024-07-06T18:15:00.081Z
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