Experimental study on inhibiting the spontaneous combustion of sulfide ores by bacteria desulfurization
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摘要:
通過室內細菌脫硫柱浸實驗,將硫化礦石顆粒表面的硫降低到臨界值以下,使脫硫后礦石自燃傾向性等級下降.結果表明,44d最大脫硫率可達61.82%,脫硫率隨著時間延長而逐漸增大.對礦石自燃傾向性分析顯示,硫化礦石的5d氧化增重率從2.044%降低到0.902%,自燃點從209.6℃升高到319.8℃,自燃傾向性等級由Ⅰ級降為Ⅲ級,降低了硫化礦石的自燃風險.
Abstract: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.
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Key words:
- sulfide minerals /
- spontaneous combustion /
- desulfurization /
- bacteria
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