Two step meso-acidophilic bioleaching of chalcopyrite containing ball mill spillage and removal of the surface passivation layer

被引：56

作者：

Panda, S. ^{[1
,4
]}

Parhi, P. K. ^{[2
]}

Nayak, B. D. ^{[3
]}

Pradhan, N. ^{[1
]}

Mohapatra, U. B. ^{[4
]}

Sukla, L. B. ^{[1
]}

机构：

[1] CSIR, IMMT, Bioresources Engn Dept, Bhubaneswar 751013, Orissa, India

[2] CSIR, IMMT, Hydro & Electromet Dept, Bhubaneswar 751013, Orissa, India

[3] CSIR, IMMT, Environm Sustainabil Dept, Bhubaneswar 751013, Orissa, India

[4] NOU, Baripada 757003, India

来源：

BIORESOURCE TECHNOLOGY | 2013年 / 130卷

关键词：

Bioleaching; Chalcopyrite; Ball mill spillage; Jarosite; Copper; SULFUR SPECIATION; FERROOXIDANS; IRON; MICROORGANISMS; DISSOLUTION; RECOVERY; INSIGHTS; CULTURE; COPPER; PURE;

D O I：

10.1016/j.biortech.2012.12.071

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Meso-acidophilic bacterial leaching of ball mill spillage (containing chalcopyrite >80%) was carried out in an innovative two-step bioleaching method. The major drawback of meso-acidophilic bioleaching limiting industrial application is the passivation phenomenon over the ore surfaces in iron-sulfur rich environments. In the present study, we present a novel wash solution that efficiently removed the passivation layer. FTIR characterization of the bioleached sample indicated that the residues could be further leached to recover extra copper after wash solution application. XRD study indicated accumulation of sulfates (SO4-) of Na, K, Fe and oxy hydroxides of iron [FeO(OH)] in the form of jarosite outlining the passivation layer. SEM, FESEM-EDS studies indicated severe corrosion effects of the wash solution on the passivation layer. Two step bioleaching of the ore sample yielded 32.6% copper in 68 days in the first interlude and post wash solution application yielded 10.8% additional copper. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：332 / 338

页数：7