Catalytic Effects of Surfactants on the Cobalt Ore Bioleaching

doi:10.12068/j.issn.1005-3026.2015.06.013

Abstract

Abstract: The effects of Tween-20， Tween-80 and RB-1181 surfactants on the bioleaching of cobalt ore were investigated. The results showed when the surfactant was employed， the contact angle between the solution and mineral was significantly decreased and the wetting action of the solution to the surface of ores increased. In addition， there were not negative effects on the growth of bacteria in the presence of appropriate concentrations of surfactants with the mass concentration of 0.25g/L， and the oxidation rates of ferrous ions were the same which were fully oxidized within 72hrs with or without surfactants. When surfactants were added， the surface properties of the intermediate product element sulfur were changed and the dispersion of surface passivation element sulfur was enhanced， thus the oxidation of element sulfur by bacteria was improved. As a result， the dissolution of the cobalt ore was accelerated， and the leaching efficiencies of metals were improved. In the presence of surfactants， the leaching efficiency of cobalt increased by approximately 34%， and that of copper increased by approximately 15% under the condition with ore pulp concentration of 10%， leaching temperature of 45℃ and the rotation rate of 180r/min.

Key words: surfactant, bioleaching, catalytic effect, cobalt ore, carrollite

CLC Number:

TF18

LIU Wei， YANG Hong-ying， TONG Lin-lin， JIN Zhe-nan. Catalytic Effects of Surfactants on the Cobalt Ore Bioleaching[J]. Journal of Northeastern University Natural Science, 2015, 36(6): 814-818.

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