Antimony Mobilisation and Attenuation During Ore Processing at Orogenic Gold Mines, Southern New Zealand.
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| Title: | Antimony Mobilisation and Attenuation During Ore Processing at Orogenic Gold Mines, Southern New Zealand. |
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| Alternate Title: | Antimon-Mobilisierung und Rückhalt bei der Erzaufbereitung in orogenen Goldminen, Süd-Neuseeland. Movilización y atenuación del antimonio durante el procesamiento del mineral en minas de oro orogénicas, sur de Nueva Zelanda. 新西兰南部造山型金矿矿物加工过程的锑迁移和衰减. |
| Authors: | Weightman, E.1 (AUTHOR), Craw, D.1 (AUTHOR) dave.craw@otago.ac.nz, Snow, T.2 (AUTHOR), Kerr, G.1 (AUTHOR) |
| Source: | Mine Water & the Environment. Mar2022, Vol. 41 Issue 1, p5-15. 11p. |
| Subject Terms: | *Gold mining, *Antimony, *Arsenic, *Autoclaves, Ores, Arsenopyrite, Hydroxides |
| Geographic Terms: | New Zealand |
| Abstract (English): | Mine waters at the Reefton orogenic gold mine (active from 2007 to 2016) in southern New Zealand contained dissolved arsenic (As) and antimony (Sb) up to 5 mg/L during production of a sulfide concentrate that included arsenopyrite (FeAsS) and stibnite (Sb2S3). Ferric oxyhydroxide adsorption extracted As down to < 0.1 mg/L but dissolved Sb remained elevated due to adsorption competition with As. The Reefton sulfide concentrate was transported 700 km to the Macraes orogenic gold mine (active from 1990) for processing through a pressure oxidation autoclave at 225 °C. The Macraes ore has low Sb contents, so the temporary introduction of a Sb-rich component produced a short-term Sb signal in the autoclave system and tailings waters. Oxidation of stibnite occurred rapidly in the autoclave, in parallel with the As in the arsenopyrite, producing ferric antimonate (tentatively identified as As-bearing tripuhyite) and ferric arsenate (FeAsO4). Dissolved Sb in the Macraes tailings waters remained < 0.1 mg/L throughout the period of Reefton concentrate addition. The formation of tripuhyite in the high-temperature autoclave stabilised Sb in the Macraes tailings, so that dissolved Sb < As, in contrast to the low-temperature processes at Reefton where dissolved Sb > As. [ABSTRACT FROM AUTHOR] |
| Abstract (Spanish): | Resumen: Las aguas de la mina de oro orogénica de Reefton (activa de 2007 a 2016) en el sur de Nueva Zelanda contenían arsénico (As) y antimonio (Sb) disueltos hasta 5 mg/L durante la producción de un concentrado de sulfuro que incluía arsenopirita (FeAsS) y estibina (Sb2S3). La adsorción sobre oxi-hidróxido férrico extrajo As hasta < 0.1 mg/L pero el Sb disuelto permaneció elevado debido a la competencia de adsorción con el As. El concentrado de sulfuro de Reefton se transportó 700 km a la mina de oro orogénica de Macraes (activa desde 1990) para su procesamiento mediante un autoclave de oxidación a presión a 225 °C. El mineral de Macraes tiene un bajo contenido en Sb, por lo que la introducción temporal de un componente rico en Sb produjo una señal de Sb a corto plazo en el sistema del autoclave y en las aguas de los relaves. La oxidación de la estibina se produjo rápidamente en el autoclave, en paralelo con el As de la arsenopirita, produciendo antimonato férrico (identificado provisionalmente como tripuhita con cierto contenido de As) y arseniato férrico (FeAsO4). El Sb disuelto en las aguas de los relaves de Macraes se mantuvo por debajo de 0.1 mg/L durante todo el período de adición del concentrado de Reefton. La formación de tripuhita en el autoclave de alta temperatura estabilizó el Sb en los residuos de Macraes, de modo que el Sb disuelto < As, en contraste con los procesos de baja temperatura en Reefton, donde el Sb disuelto > As. [ABSTRACT FROM AUTHOR] |
| Abstract (German): | Zusammenfassung: Das Grubenwasser der orogenen Goldmine Reefton (aktiv von 2007 bis 2016) im Süden Neuseelands enthielt während der Produktion eines Sulfidkonzentrats, das reich an Arsenopyrit (FeAsS) und Stibnit (Sb2S3) war, bis zu 5 mg/L gelöstes Arsen (As) und Antimon (Sb). Adsorption an Eisenoxyhydroxid entfernte As bis auf < 0.1 mg/L, aber die Konzentration des gelösten Sb blieb aufgrund der Adsorptionskonkurrenz mit As erhöht. Das Reefton-Sulfidkonzentrat wurde 700 km zur orogenen Goldmine Macraes (aktiv seit 1990) transportiert, wo es in einem Druckoxidationsautoklaven bei 225 °C verarbeitet wurde. Das Macraes-Erz hat niedrige Sb-Gehalte, so dass die vorübergehende Zuführung einer Sb-reichen Komponente ein kurzzeitiges Sb-Signal im Autoklavensystem und in den Tailings-Wässern erzeugte. Parallel zur Oxidation von As im Arsenopyrit fand die Oxidation von Stibnit im Autoklaven sehr schnell statt, wodurch Eisen(III)-antimonat (vorläufig als As-haltiger Tripuhyit identifiziert) und Eisen(III)-arsenat (FeAsO4) gebildet wurden. Während des gesamten Zeitraums der Zugabe von Reefton-Konzentrat blieb das gelöste Sb in den Macraes Tailingswässern unter 0.1 mg/L. Die Bildung von Tripuhyit im Hochtemperatur-Autoklaven stabilisierte das Sb in den Macraes-Tailings, so dass das gelöste Sb < As war, im Gegensatz zu den Niedertemperatur-Prozessen in Reefton, wo das gelöste Sb > As war. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): | 抽象的: 新西兰南部Reefton造山型金矿 (生产期 2007年 ~ 2016年) 制取砷黄铁矿 (FeAsS) 和辉锑矿 (Sb2S3) 的硫化物浓缩液时, 矿井水含溶解态砷 (As) 和锑 (Sb) 高达5 mg/L. 经氢氧化铁吸附提取, 砷浓度降至 < 0.1 mg/L; 但是, 由于与As吸附竞争, 溶解态Sb浓度仍然很高. Reefton金矿的硫化物浓缩液被运到700公里外的Macraes造山带金矿 (1990年投产), 利用225℃高压氧化反应釜处理. Macraes的矿石锑 (Sb) 含量较低, 因此临时汇入富锑 (Sb) 成分会在高压釜系统和尾矿水中产生短时锑 (Sb) 信号. 辉锑矿在高压釜中迅速氧化, 并与砷黄铁矿中的As, 生成了锑酸铁 (亦定为含砷锑铁矿) 和砷酸铁 (FeAsO4). 在添加Reefton浓缩液的整个过程中, Macraes尾矿水的溶解态锑Sb保持 < 0.1 mg/L. 高温高压釜中锑铁矿的生成固定了Macraes尾矿中的Sb, 使尾矿水溶解态Sb < As; 相比之下, Reefton低温处理工艺, 尾矿水溶解态Sb > As. [ABSTRACT FROM AUTHOR] |
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| Database: | GreenFILE |
| Abstract: | Mine waters at the Reefton orogenic gold mine (active from 2007 to 2016) in southern New Zealand contained dissolved arsenic (As) and antimony (Sb) up to 5 mg/L during production of a sulfide concentrate that included arsenopyrite (FeAsS) and stibnite (Sb2S3). Ferric oxyhydroxide adsorption extracted As down to < 0.1 mg/L but dissolved Sb remained elevated due to adsorption competition with As. The Reefton sulfide concentrate was transported 700 km to the Macraes orogenic gold mine (active from 1990) for processing through a pressure oxidation autoclave at 225 °C. The Macraes ore has low Sb contents, so the temporary introduction of a Sb-rich component produced a short-term Sb signal in the autoclave system and tailings waters. Oxidation of stibnite occurred rapidly in the autoclave, in parallel with the As in the arsenopyrite, producing ferric antimonate (tentatively identified as As-bearing tripuhyite) and ferric arsenate (FeAsO4). Dissolved Sb in the Macraes tailings waters remained < 0.1 mg/L throughout the period of Reefton concentrate addition. The formation of tripuhyite in the high-temperature autoclave stabilised Sb in the Macraes tailings, so that dissolved Sb < As, in contrast to the low-temperature processes at Reefton where dissolved Sb > As. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 10259112 |
| DOI: | 10.1007/s10230-021-00836-5 |
