Inhibition of Sulfide Mineral Oxidation by Surface Coating Agents: Batch
- Inhibition of Sulfide Mineral Oxidation by Surface Coating Agents: Batch
- 최재영; 지민규; 윤현식; 박영태; E.D Gee; W.R Lee; B.-H Jeon
- Issue Date
- European Geosciences Union
- VOL 14
- Mining activities and mineral industries have impacted on rapid oxidation of sulfide minerals such as pyrite
(FeS2) which leads to Acid Mine Drainage (AMD) formation. Some of the abandoned mines discharge polluted
water without proper environmental remediation treatments, largely because of financial constraints in treating
AMD. Magnitude of the problem is considerable, especially in countries with a long history of mining. As metal
sulfides become oxidized during mining activities, the aqueous environment becomes acid and rich in many
metals, including iron, lead, mercury, arsenic and many others. The toxic heavy metals are responsible for the
environmental deterioration of stream, groundwater and soils. Several strategies to remediate AMD contaminated
sites have been proposed. Among the source inhibition and prevention technologies, microencapsulation (coating)
has been considered as a promising technology. The encapsulation is based on inhibition of O2 diffusion by
surface coating agent and is expected to control the oxidation of pyrite for a long time.
Potential of several surface coating agents for preventing oxidation of metal sulfide minerals from both Young-
Dong coal mine and Il-Gwang gold mine were examined by conducting batch experiments and field tests.
Powdered pyrite as a standard sulfide mineral and rock samples from two mine outcrops were mixed with six
coating agents (KH2PO4, MgO and KMnO4 as chemical agents, and apatite, cement and manganite as mineral
agents) and incubated with oxidizing agents (H2O2 or NaClO). Batch experiments with Young-Dong coal mine
samples showed least SO42- production in presence of KMnO4 (16% sulfate production compared to no surface
coating agents) or cement (4%) within 8 days. In the case of Il-Gwang mine samples, least SO42- production
was observed in presence of KH2PO4 (8%) or cement (2%) within 8 days.
- Appears in Collections:
- KIST Publication > Conference Paper
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.