流态化焙烧重质碳酸锰制备化学二氧化锰

Preparation of Chemical-manganese Dioxide by Fluidizing Roasting in Heavy Mn-carbonate

流态化焙烧碳酸锰可以得到较高的转化率,与传统方法相比,明显减少了热解反应时间,降低了工艺能耗。通过冷态气体流量试验和单因素条件试验确定碳酸锰焙烧热解的最佳条件为:焙烧温度350℃、焙烧时间1 h、流化气流量为1 L/h,制备水蒸气时水浴锅温度为80℃,碳酸锰转化率可以达到87.3%。最终产品MnO2纯度为100%,重质化后视密度达到1.5 g/cm3,比表面积大,吸液能力较强。

Fluidizing roasting of manganese carbonate can get higher conversion rate. Compared to traditional process, this technology can reduce the roasting time, including the energy consumption. The optimum fluidizing roasting conditions through cold-state gas flow experiments and single factor experiments are found as follows： when the roasting temperature is 350~C, the roasting time will be 1 h, air flow rate is 1 L/h, the water temperature is kept at 80~C, and a conversion rate efficiency of greater than 87.3% for MnCO3 can be achieved. The MnO2, whose purity is 100% and apparent density is 1.5 g/cm3. It has have an advantage on high specific surface area and strong absorption capacity.