To provide an improved low environmental load type metal recovery method which can highly efficiently perform repeated cyanogen formation and decomposition by carrying out a time-consuming cyanogen decomposition/detoxification process in a shorter period of time.
The method for recovering a metal from a metal-containing material using cyanogen formation decomposition bacteria comprises the steps of: (1) culturing the cyanogen formation decomposition bacteria in an eutrophic culture medium to form cyanogen; (2) dissolving the metal from the metal-containing material using the cyanogen formed in the step (1); (3) adding a glutamic acid derivative and/or serine derivative and glucose to the culture medium to change it into a nutrient deprived culture medium and culturing the cyanogen formation decomposition bacteria to decompose the cyanogen remaining in the step (2); and (4) recovering the metal from a solution of the metal in the step (2) or step(3).
COPYRIGHT: (C)2008,JPO&INPIT
KITA YOSHITO
NISHIKAWA HIROSHI
Kakehi Yuro
Masahito Hayashi