Leaching of Chalcopyrite in Acidified Nitrate Using Seawater-Based Media

Autor:	Teófilo A. Graber, O. Herreros, María E. Taboada, Yousef Ghorbani, Pía Hernández
Rok vydání:	2018
Předmět:	lcsh:QE351-399.2 chloride chemistry.chemical_element 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Chloride 020501 mining & metallurgy chemistry.chemical_compound Copper extraction techniques Nitrate nitrate medicine seawater 0105 earth and related environmental sciences lcsh:Mineralogy Chalcopyrite Geology Sulfuric acid Geotechnical Engineering and Engineering Geology Copper chalcopyrite leaching 0205 materials engineering chemistry visual_art visual_art.visual_art_medium Seawater Leaching (metallurgy) Nuclear chemistry medicine.drug
Zdroj:	Minerals Volume 8 Issue 6 Minerals, Vol 8, Iss 6, p 238 (2018)
ISSN:	2075-163X
DOI:	10.3390/min8060238
Popis:	The leaching of copper from industrial copper ore with 4.8 wt % chalcopyrite by acidified nitrate with seawater based media was investigated. Water quality (pure water and seawater), temperature (25&ndash 70 ° C), reagent concentration, and nitrate type (sodium and potassium) were studied variables. Leaching conditions were: 100 g ore/1 L solution P80 of 62.5 µ m 400 rpm and leaching time, varying between 3 and 7 days. Nitrates in sulfuric acid are known to be good oxidants for sulfide ores. This study showed that up to 80 wt % copper could be extracted at 45 ° C in 7 days. In the absence of nitrate, under the same leaching conditions, only a 28 wt % copper extraction was achievable. The extraction rate increased to 97.2 wt % when leach temperature was increased to 70 ° C in nitrate-chloride-acid media. The presence of chloride ions also increased the copper extraction rate. The copper extraction achieved in seawater systems were higher than in water systems under the same leaching conditions (increased by an average of 18 wt %). This effect can be attributable to the contribution of chloride that increases proton (H+) activity.
Databáze:	OpenAIRE
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