Cobalt-bearing copper slags from Luanshya (Zambian Copperbelt): Mineralogy, geochemistry, and potential recovery of critical metals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F22%3A00000221" target="_blank" >RIV/00025798:_____/22:00000221 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/22:10448476 RIV/60460709:41210/22:91064

Výsledek na webu

<a href="https://doi.org/10.1016/j.gexplo.2022.106987" target="_blank" >https://doi.org/10.1016/j.gexplo.2022.106987</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gexplo.2022.106987" target="_blank" >10.1016/j.gexplo.2022.106987</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Cobalt-bearing copper slags from Luanshya (Zambian Copperbelt): Mineralogy, geochemistry, and potential recovery of critical metals

Popis výsledku v původním jazyce

Waste materials such as metallurgical slags can be considered as potential resources of valuable elements,including technologically critical metals. Copper slags from Luanshya, the oldest mining and smelting site in theZambian Copperbelt, produced by smelting local Cu ores in reverberatory furnaces between 1932 and 1999, weredeposited on two large dumps in the vicinity of the former ore processing area. The slags exhibit high concentrations of Co (247–5990 ppm, median: 2370 ppm) and Cu (1320–95,300 ppm, median: 8550 ppm). This multimethod mineralogical investigation indicates that the slags are predominantly composed of olivine, clinopyroxene, silicate glass, and spinel-family oxides. Copper-(Fe) sulfides, cobaltpentlandite [(Co,Fe)9S8], Fe sulfides, and metallic Cu prills embedded in the silicate matrix are the major hosts of Cu and Co. The EU regulatory leaching test (EN 12457-2) indicated that the release of contaminants is relatively low and only Cu slightly exceeded the EU limit values for landfilling of inert waste. The secondary phases (Cu hydroxosulfates, Fe (oxyhydr)oxides) observed on the slag surfaces confirm that the slags undergo a weathering process on thedumps. Kinetic abiotic extraction tests were carried out in 0.5 mol/l sulfuric acid at 25 ◦C and with a pulp density of 1percent to determine the release of metals from the milled Luanshya slags under conditions simulating hydrometallurgical recovery via agitation leaching. The Cu and Co extractability correlated with the bulk concentration of these elements, and the highest extraction yields after 24 h of leaching corresponded to 46percent of the total Cu and 67percent of the total Co. Despite the dramatic increase in Co prices on the global market, the Co recovery from the Luanshya slags appears to be non-economical due to the high costs of the necessary mechanical and chemical processing of the slag materials and the obtained extracts.

Název v anglickém jazyce

Cobalt-bearing copper slags from Luanshya (Zambian Copperbelt): Mineralogy, geochemistry, and potential recovery of critical metals

Popis výsledku anglicky

Waste materials such as metallurgical slags can be considered as potential resources of valuable elements,including technologically critical metals. Copper slags from Luanshya, the oldest mining and smelting site in theZambian Copperbelt, produced by smelting local Cu ores in reverberatory furnaces between 1932 and 1999, weredeposited on two large dumps in the vicinity of the former ore processing area. The slags exhibit high concentrations of Co (247–5990 ppm, median: 2370 ppm) and Cu (1320–95,300 ppm, median: 8550 ppm). This multimethod mineralogical investigation indicates that the slags are predominantly composed of olivine, clinopyroxene, silicate glass, and spinel-family oxides. Copper-(Fe) sulfides, cobaltpentlandite [(Co,Fe)9S8], Fe sulfides, and metallic Cu prills embedded in the silicate matrix are the major hosts of Cu and Co. The EU regulatory leaching test (EN 12457-2) indicated that the release of contaminants is relatively low and only Cu slightly exceeded the EU limit values for landfilling of inert waste. The secondary phases (Cu hydroxosulfates, Fe (oxyhydr)oxides) observed on the slag surfaces confirm that the slags undergo a weathering process on thedumps. Kinetic abiotic extraction tests were carried out in 0.5 mol/l sulfuric acid at 25 ◦C and with a pulp density of 1percent to determine the release of metals from the milled Luanshya slags under conditions simulating hydrometallurgical recovery via agitation leaching. The Cu and Co extractability correlated with the bulk concentration of these elements, and the highest extraction yields after 24 h of leaching corresponded to 46percent of the total Cu and 67percent of the total Co. Despite the dramatic increase in Co prices on the global market, the Co recovery from the Luanshya slags appears to be non-economical due to the high costs of the necessary mechanical and chemical processing of the slag materials and the obtained extracts.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Geochemical Exploration

ISSN

0375-6742

e-ISSN

—

Svazek periodika

237

Číslo periodika v rámci svazku

June : 106987

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

nestránkováno

Kód UT WoS článku

000806555100001

EID výsledku v databázi Scopus

2-s2.0-85127366158