The variation rules between pH value and fluorine ion concentration in the uranium ore soaking solution,the influence of
different originated fluorine ion concentration to the
iron-sulfur oxidizing bacteria growth and the bacteria's adapted ability to fluorine ion in the process of uranium ores bioleaching have been investigated against the characteristic of higher grade fluorine in the uranium ores.The consequence reveals that the fluorine ion concentration is continuously rising up while the pH is falling down,and the strains of bacteria used in this research are greatly sensitive to fluorine ion,such as,fluorine of 20 mg/L would inhibit growth of the bacteria.And result also shows that the strain can tolerate the higher fluorine ion concentration after a long time period
domestication in high fluorine-containing culture.For example,after domestication,strain of Z-1 can completely oxidize 5 g/L Fe~(2+) in fluorine-containing culture(fluorine ion concentration is 1.48 g/L) in 24 h.The conclusion indicates that iron-sulfur oxidizing bacteria can acclimate the environment of fluorinecontaining by domestication and its application in bioleaching not only elevate the uranium leaching rate,but also reduce the economic investment.