高磷菱锰矿焙烧-氨浸实验研究

采用焙烧-氨浸工艺对重庆城口地区的高磷菱锰矿进行脱磷提锰研究, 在热力学分析的基础上, 考察了焙烧温度、焙烧时间对高磷菱锰矿分解率、活性以及锰浸出率的影响, 并综合分析它们的交互作用, 得到最佳焙烧工艺条件为:焙烧温度650 ℃, 焙烧时间100 min。所得焙砂用16 mol/L氨水常温浸出60 min, 锰浸出率为73.89%; 浸出液蒸发后得到的MnCO₃产品中锰品位43.51%、磷含量0.012%。

Experimental Research on Roasting and Ammonia Leaching of High Phosphorus Rhodochrosite

Experiments on the dephosphorization and manganese extraction for high-phosphorus rhodochrosite in Chongqing Chengkou district were carried out by adopting a roasting and ammonia leaching process. Based on the thermodynamic analysis, the effects of roasting temperature and roasting time on the decomposition rate, activity and manganese leaching rate of high-phosphorus rhodochrosite were investigated, and interactions among these factors were also comprehensively analyzed. The optimal roasting processing conditions were finally determined. The high-phosphorus rhodochrosite is subjected to a roasting process at 650 ℃ for 100 min, and then the obtained calcine is leached for 60 min with 16 mol/L ammonia water at room temperature, resulting in the manganese leaching rate at 73.89%. After the evaporation of the leachate, the MnCO₃ product can be obtained with manganese grade of 43.51% and the phosphorus content of 0.012%.