Experimental study on inhibiting the spontaneous combustion of sulfide ores by bacteria desulfurization

Bacterial desulfurization and column leaching were used to decrease the content of sulfur in sulfide ores' surface to a extreme low level even below the critical value so that the spontaneous combustion tendency of the desulfurized ores weakened.The experiment results show that the maximal desulfurization rate can reach 61.82% after 44 d treatment,and gradually increases with prolonging time.Based on the analysis of the spontaneous combustion tendency of sulfide ores,it is indicated that the oxidation weight gain rate of sulfide ores in 5 d decreases from 2.044% to 0.902% while the ores' spontaneous combustion point increases from 209.6℃ to 319.8℃.As a result,the spontaneous combustion tendency downgrades from level Ⅰ to level Ⅲ and the risk of spontaneous combustion is lowered.