Inhibition of sulfide mineral oxidation by surface coating agents: batch and field studies.
The potential of several surface coating agents to inhibit the oxidation of metal sulfide minerals from Young-Dong coal mine and the Il-Gwang gold mine was examined by conducting laboratory scale 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 (KH(2)PO(4), MgO and KMnO(4) as chemical agents, and apatite, cement and manganite as mineral agents) and incubated with oxidizing agents (H(2)O(2) or NaClO). For the observed time period (8 days), Young-Dong coal mine samples exhibited the least sulfate (SO(4)(2-)) production in the presence of KMnO(4) (16%) or cement (4%) while, for Il-Gwang mine samples, the least SO(4)(2-) production was observed in presence of KH(2)PO(4) (8%) or cement (2%) compared to control. Field-scale pilot tests at the Il-Gwang site also showed that addition of KH(2)PO(4) decreased SO(4)(2-) production from 200 to 13 mg L(-1) and it also reduced Cu and Mn from 8 and 3 mg L(-1), respectively to <0.05 mg L(-1) (below ICP-OES detection limits). The experimental results suggested that the use of surface coating agents is a promising alternative for sulfide oxidation inhibition at acid mine drainage sites.
Korea Institute of Science and Technology, Gangneung Institute, 679 Saimdang-ro, Gangneung 210-340, South Korea.
Min-Kyu
MK
Ji
Eun-Do
ED
Gee
Hyun-Shik
HS
Yun
Woo-Ram
WR
Lee
Young-Tae
YT
Park
Moonis Ali
MA
Khan
Byong-Hun
BH
Jeon
Jaeyoung
J
Choi
D002133:Calcium Sulfate / Q000737:chemistry; D007220:Industrial Waste; D017895:Manganese Compounds / Q000737:chemistry; D008903:Minerals / Q000737:chemistry; D008906:Mining; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D011196:Potassium Permanganate / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties; D018505:Waste Management / Q000379:methods*
D007220:Industrial Waste; D017895:Manganese Compounds; D008903:Minerals; D010087:Oxides; D010710:Phosphates; D017680:Potassium Compounds; D013440:Sulfides; D011196:Potassium Permanganate; C027424:manganese oxide; C013216:potassium phosphate; D002133:Calcium Sulfate