Improving zinc recovery by the thermoacidophilic archeon Acidianus copahuensis using thetrathionate

DONATI E.R.; CASTRO C.

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 26 p. 3004 - 3014

1003-6326

Attachment and bioleaching experiments were conducted to evaluate the zinc recovery from Hualilan ore by the thermoacidophilic archaeon A. copahuensis. Cells of this species pregrown on tetrathionate showed higher capability of attachment to the ore than cells pregrown on other energy sources and such attachment seemed to be mediated by the production of extracellular polymeric substances. A. copahuensis achieved a successful bioleaching of the ore reaching 100 % of zinc recovery when tetrathionate was added. Simultaneous addition of yeast extract and tetrathionate maintained the zinc extraction but at higher rate. Zinc dissolution kinetics was controlled by chemical reaction in cultures with the external addition of tetrathionate but by the diffusion through a product layer of jarosite in the other cultures.