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Selective removal of impurity elements from Maurliden Västra complex sulphides flotation concentrate
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Impurity removal is one of the major problems encountered in copper metallurgy today because relatively pure copper ores reserves are becoming exhausted, and the resources of unexploited ores often contain relatively high amounts of several impurity elements like antimony, arsenic, mercury and bismuth, which need to be eliminated. The present work is concerned to pre-treat an antimony-arsenic-bearing copper concentrate by selective dissolution of the impurities, therefore, upgrading the concentrate for pyro-processing. To accomplish this, selective dissolution of antimony and arsenic from a tetrahedrite-containing copper concentrate by alkaline hypochlorite, acidic cupric chloride and alkaline sulphide leach solutions were investigated. Alkaline hypochlorite solution shows high degree of selectivity in solubilising antimony and arsenic but low recoveries while the acidic cupric chloride solution is highly selective to zinc and lead with insignificant recovery of antimony and arsenic. However, alkaline sulphide solution proves to be greatly selective to dissolve the impurity elements from the concentrate with high yields of the elements into the leach liquor. Moreover, further studies on alkaline sulphide solution leaching efficiency were conducted in order to ascertain the optimum conditions for antimony and arsenic recovery. The investigated parameters were sulphide ions concentration, solids concentration, leaching temperature and leaching kinetics.

Place, publisher, year, edition, pages
Keyword [en]
Physics Chemistry Maths, Impurity, selectivity, complex sulphide concentrate, leach, liquor, recovery, pyroprocessing
Keyword [sv]
Fysik, Kemi, Matematik
URN: urn:nbn:se:ltu:diva-54060ISRN: LTU-PB-EX--08/076--SELocal ID: b076db8d-7b3e-479d-b842-d6fb889b4c0eOAI: diva2:1027439
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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