The Application of a Follow-Up Technique in an Experimental Military Operant Conditioning Program

Wichlacz, Casimér R.; Jones, Franklin D.; Poirier, Joseph G.; Stayer, Stephen J.

doi:10.21236/ada101221

Cited by 1 publication

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“…The separation of the two effects permits the enhancement of both stages: the chemical stage can be enhanced by means of a thermic activation (T. ferrooxidans is mesophilic and its growth is hindered above 35°C), the use of catalysts and a control of pH. The biological stage can be enhanced by performing the ferrous iron oxidation through biofilm reactors, more effective than suspended growth reactors [4][5][6].…”

Section: Indirect Bioleaching With Effects Separation Processmentioning

confidence: 99%

Kinetics improvement of high-grade sulphides bioleaching by effects separation

Carranza

Iglesias

Romero

et al. 1993

FEMS Microbiology Reviews

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The kinetics of bioleaching of sulphide concentrates by Thiobacillus ferrooxidans can be improved by performing separately the two operations relating the two effects involved in the indirect contact mechanism, (1) chemical leaching and (2) biological oxidation of the Fe2+ produced in the chemical stage (IBES: Indirect Bioleaching with Effects Separation). This scheme permits the separate enhancement of each stage. On the one hand, the chemical attack of the ferric iron to sulphides can be performed at a higher temperature. On the other hand, the biological oxidation stage is more effective when biofilm models are applied. At the same time, inhibitory phenomena produced as a result of the bacterial breaking caused by the abrasion of the solid particles on microorganisms are prevented. In this work the 1BES process has been applied to a Spanish copper‐zinc and a copper sulphide concentrate. The objective has been to selectively dissolve zinc, which may be recovered by solvent exraction, the remaining residue being a copper concentrate suitable for pyrometallurgical treatment. The attributes of moderate temperature, atmospheric pressure, low cost of the leaching agent, flexibility and effectiveness make the process very attractive from an economic point of view.

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Section: Indirect Bioleaching With Effects Separation Processmentioning

confidence: 99%