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Author Zuniga-Barra, H.; Toledo-Alarcon, J.; Torres-Aravena, A.; Jorquera, L.; Rivas, M.; Gutierrez, L.; Jeison, D.
Title (up) Improving the sustainable management of mining tailings through microbially induced calcite precipitation: A review Type
Year 2022 Publication Minerals Engineering Abbreviated Journal Miner. Eng.
Volume 189 Issue Pages 107855
Keywords Microbially induced calcite precipitation(MICP); Tailings; Mining industry; Calcite; Precipitation; Environment
Abstract Mining activities offers evident potential economic benefits for mineral rich countries. However, mining operations can produce a series of environmental impacts. Many of them are associated with the generation and management of tailings. Biogeochemical processes have potential to modify the properties of particulate solids, such as tailings. Microbial induced calcite precipitation (MICP) is probably the most studied biogeochemical process. It promotes calcite precipitation, as a result of biological activity of different microorganisms. Available research indicates that MICP is a tool that has the potential to contribute to a more sustainable management of tailing deposits. Indeed, MICP have been reported as a technology suitable for removal and/or immobilization of heavy metals, creation of impermeable barriers, prevention of soil liquefaction and control of windblown dust emissions. However, several challenges still need to be addressed to enable relible full-scale implementation, requiring research in the near future. These are consideration of the particular chemical composition of tailings, reduction of urea requirements, determination of optimal reagents dosage, evaluation of the long term stability of the treatment and calculation of costs associated to ecah particular application.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0892-6875 ISBN Medium
Area Expedition Conference
Notes WOS:000903969400003 Approved
Call Number UAI @ alexi.delcanto @ Serial 1714
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Author Reyes-Bozo, L.; Herrera-Urbina, R.; Saez-Navarrete, C.; Otero, A.F.; Godoy-Faundez, A.; Ginocchio, R.
Title (up) Rougher flotation of copper sulphide ore using biosolids and humic acids Type
Year 2011 Publication Minerals Engineering Abbreviated Journal Miner. Eng.
Volume 24 Issue 14 Pages 1603-1608
Keywords Flotation collectors; Flotation froths; Flotation reagents
Abstract In the quest of new, less hazardous, and more ambient-friendly froth flotation reagents, the use of biosolids or humic acids as both collector and frother for the concentration of copper sulphide ores was investigated. Rougher flotation tests were conducted in Denver cells on a laboratory scale, and metallurgical indicators such as copper recovery, copper concentrate grade, and concentration and enrichment ratios were compared with those obtained under similar conditions but using conventional collectors and frothers for the industrial flotation of copper sulphide ores. With a dosage of 10% (w/w) biosolids, copper recovery and grade were 26% and 0.81%, respectively. The copper recovery and grade obtained with 1.5% (w/w) salt of humic acids were 29.7% and 3.5%, respectively. A significantly higher copper recovery (65.1%) was obtained with conventional industrial collectors and frothers, but the grade was also low (3.1% Cu). With the same dosage of humic substances, humic acid show that the flotation rate constant was significantly higher (0.2 min(-1)) than that obtained with the same dosage of biosolids (0.09 min(-1)). These results indicate that humic acids have more affinity than biosolids for copper-containing mineral species, and also show that biosolids and humic acids could be used as both collector and frother in the sulphide mineral concentration process by froth flotation. Because the distribution of iron in the concentrate obtained with biosolids is highest, these materials seem to have more affinity for pyrite. (C) 2011 Elsevier Ltd. All rights reserved.
Address [Reyes-Bozo, Lorenzo; Saez-Navarrete, Cesar] Pontificia Univ Catolica Chile, Dept Ingn Quim & Bioproc, Santiago, Chile, Email: lcreyes@ing.puc.cl
Corporate Author Thesis
Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0892-6875 ISBN Medium
Area Expedition Conference
Notes WOS:000297000700010 Approved
Call Number UAI @ eduardo.moreno @ Serial 181
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