软锰矿流态化低温还原实验研究

Study on the Fluidizing Reduction of Pyrolusite at Low Temperature

采用流化床反应器作为焙烧装置,模拟发生炉煤气气体组分作为还原气体,考察了云南某地区软锰矿还原焙烧的影响因素。结果表明:煤气中氧化性气体组分的存在降低了该锰矿的还原效率。在700℃以下还原得到的产品,在隔绝氧气的条件下静置1 h或者直接投入水中,均表现出良好的抗氧化特性。通过对工艺参数进行优化,发现在模拟发生炉煤气气氛下,500℃流态化还原焙烧8 min获得的产品经过防氧化处理后,锰的浸出率可以达到95%以上。

This study presents the reduction behaviors of a pyrolusite from Yunnan Province in a fluidized bed reactor. The composition of the reducing gas is configured according to a simulated coal-gas generator The reduction temperature is in the range of 400 ~ 800℃. The results show that the presence of oxidative gas lowers the efficiency of the reduction process. And the product is obtained under the reaction temperature lower than 700℃ for 1 h and oxygen-free or water-surrounding environment exhibiting an acceptable resistance to oxidation. Through optimization of the operation parameters,the yield of the Mn leaching might reach more than 95% by reduction of the raw pyrolusite at 500℃ for 8 min and subsequent anti-oxidation treatment.