Related Experiment Video
Updated: May 15, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Two step meso-acidophilic bioleaching of chalcopyrite containing ball mill spillage and removal of the surface
S Panda1, P K Parhi, B D Nayak
1Bioresources Engineering Department, CSIR-Institute of Minerals and Materials Technology (IMMT), Bhubaneswar 751013, India. panda.sandeep84@gmail.com
Abstract:
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 (SO(4)(-)) 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 68days in the first interlude and post wash solution application yielded 10.8% additional copper.
More Related Videos
Related Concept Videos
Microbial Leaching
Acid Mine Drainage
Extraction: Advanced Methods
Electrodeposition
Electrodeposition can...
Microbial Corrosion
Washing, Drying, and Ignition of Precipitates

