Treatment of As-rich mine effluents and produced residues stability: Current knowledge and research priorities for gold mining

Proteomic Analysis of Arsenic Resistance during Cyanide Assimilation by Pseudomonas pseudoalcaligenes CECT 5344

“…The biogeochemical cycle of arsenic (As), a metalloid widely distributed in the lithosphere, encompasses both natural and anthropic processes [ 1 , 2 , 3 , 4 ]. Due to human activities, arsenic can reach molar range concentrations in gold mining effluents [ 5 ], where other toxic pollutants such as cyanide and heavy metals are also present. Arsenic is considered a serious environmental pollutant that is highly toxic to humans [ 6 , 7 , 8 ].…”

Removal of arsenic from smelting wastewater using Fe3O4as anin situFe source: the effect of pre-dissolution and the evolution process of scorodite

“…30 Coudert et al effectively removed As from a sulfuric acid system by hydrothermal oxidation. 31 The synthesis of scorodite at atmospheric pressure and low temperature has more economic potential. 2,[32][33][34] However, liquid iron sources hardly control the supersaturation of the system in the scorodite synthesis process.…”

Novel strategy for reusing agricultural mulch film residual by iron modification for arsenic removal in gold-smelting wastewater

“…Otherwise, the precipitation as crystalline scorodite ( Langmuir et al, 2006 ; Bluteau and Demopoulos, 2007 ; Caetano et al, 2009 ) was reported to offer the advantages of combining a relatively high arsenic content and low release of arsenic in aqueous solutions, but large amounts of neutralizing agents were necessary because of the high alkalinity in the final leaching solution. Therefore, the process of arsenic removal by precipitation is commonly used by the metallurgical and mining industry ( De Klerk et al, 2012 ; Cui et al, 2014 ; Coudert et al, 2020 ), mainly due to its lower cost. However, the concentration of residual arsenic is always at the level of mg/L, which is the limit to the technology of precipitation, and most seriously, much sludge with arsenic contamination will be generated, resulting in serious secondary pollution during transportation, storage, and disposal ( Lin, 2004 ; Feng et al, 2017a ; Coudert et al, 2020 ).…”

“…Therefore, the process of arsenic removal by precipitation is commonly used by the metallurgical and mining industry ( De Klerk et al, 2012 ; Cui et al, 2014 ; Coudert et al, 2020 ), mainly due to its lower cost. However, the concentration of residual arsenic is always at the level of mg/L, which is the limit to the technology of precipitation, and most seriously, much sludge with arsenic contamination will be generated, resulting in serious secondary pollution during transportation, storage, and disposal ( Lin, 2004 ; Feng et al, 2017a ; Coudert et al, 2020 ). Focusing on the possible leakage and secondary pollution of arsenic, this work aims to find a new process for arsenic removal in gold-smelting wastewater by adsorption technology using a new adsorbent, expected with no sludge and hazardous solid waste.…”