Cobalt-bearing 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%2F61989592%3A15310%2F22%3A73614575" target="_blank" >RIV/61989592:15310/22:73614575 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0375674222000450" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0375674222000450</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 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 the Zambian Copperbelt, produced by smelting local Cu ores in reverberatory furnaces between 1932 and 1999, were deposited 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 teaching 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 (oxyhydroxides) observed on the slag surfaces confirm that the slags undergo a weathering process on the dumps. Kinetic abiotic extraction tests were carried out in 0.5 mol/l sulfuric acid at 25 ◦C and with a pulp densityof 1% 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 46% of the total Cu and 67% 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 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 the Zambian Copperbelt, produced by smelting local Cu ores in reverberatory furnaces between 1932 and 1999, were deposited 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 teaching 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 (oxyhydroxides) observed on the slag surfaces confirm that the slags undergo a weathering process on the dumps. Kinetic abiotic extraction tests were carried out in 0.5 mol/l sulfuric acid at 25 ◦C and with a pulp densityof 1% 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 46% of the total Cu and 67% 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

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

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

1879-1689

Svazek periodika

237

Číslo periodika v rámci svazku

JUN

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

"106987-1"-"106987-10"

Kód UT WoS článku

000806555100001

EID výsledku v databázi Scopus

2-s2.0-85127366158