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Immobilization of arsenic from copper smelter waste

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Gullón Corral, Lidia
dc.contributor.author Suarez Garcia, Carlos
dc.date.accessioned 2016-09-22T08:55:25Z
dc.date.available 2016-09-22T08:55:25Z
dc.date.issued 2016-09-13
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/22156
dc.description.abstract Arsenic is an inconvenient impurity for copper smelters and its problematic its bound to worsen as concentrates become dirtier. Air emissions are prevented during the off-gas treatment so it deports to liquid effluents and dusts. From effluents it cannot be removed easily together with other metals and specific removal needs to be considered. At industrial level the preferred choice is precipitation and copper smelters thus seek precipitates that are safe enough for inexpensive landfill disposal. The literature review identified the most common methods used by industry as well as more novel proposals to remove arsenic from solution. When precipitates or other types of solids are still too hazardous for safe disposal, it is possible to stabilise them with other methods discussed. The experimental work tested one solid stabilisation approach, vitrification, on hazardous copper smelter waste. Next, after producing an arsenic bearing solution similar to copper smelter effluents by leaching the same waste, five precipitation methods were tested: high iron arsenical ferrihydrite, a two-step process using aluminium and iron, arsenate hydroxyapatite, gypsum seeded scorodite and ferrous arsenate (symplesite). The short term leaching behaviour of the solids was tested with 24 hour bottle tests performed at different pH conditions. The results showed that all methods produced solids somewhat safer than the original one, but only the symplesite and two step precipitation methods have resulted in solids safe enough for landfill disposal. A preliminary cost estimation shows that these methods could be competitive with existing processes, while producing a safer solid. Regarding vitrification of the current waste, even though the particular conditions of the test were unable to produce a safe enough solid, the waste proved amenable to the process. en
dc.format.extent 67+15
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Immobilization of arsenic from copper smelter waste en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.subject.keyword arsenic removal en
dc.subject.keyword arsenic precipitation en
dc.subject.keyword immobilization en
dc.subject.keyword copper smelter waste en
dc.subject.keyword vitrification en
dc.identifier.urn URN:NBN:fi:aalto-201609224165
dc.programme.major Minerals and Environmental Engineering fi
dc.programme.mcode CHEM3006 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Serna, Rodrigo
dc.programme Erasmus Mundus Minerals and Environmental Programme fi
dc.location PK fi
local.aalto.openaccess yes
dc.rights.accesslevel openAccess
local.aalto.idinssi 54399
dc.type.publication masterThesis
dc.type.okm G2 Pro gradu, diplomityö

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