微波加热预处理一水硬铝石矿的工艺研究

Study on Microwave Roasting of Diaspore

利用微波加热对我国一水硬铝石矿进行了活化焙烧的实验研究,以降低拜耳法溶出的温度。从微波添加剂、微波加热功率和微波加热时间对铝土矿的溶出性能的影响等方面进行了研究。并利用SEM技术对活化焙烧矿的微观形貌进行了分析。实验结果表明,微波加热焙烧的最佳工艺条件为:NaOH添加量100 kg/t,微波加热温度535℃,加热时间5 min。短时间的微波辐射就能使矿石的微观形貌发生显著变化。

Roasting process of diaspore by microwave was tested in order to decrease the digestion temperature,the effects of operation parameters such as NaOH addition,roasting temperature and roasting time were investigated,the digestion performance of roasting ore and head ore were comparatively studied,and the microstructure of roasting ore was analyzed by SEM.The optimal conditions is 100 kg/t NaOH addition,535℃ roasting temperature,and 5 min roasting time,short microwave irradiation time has obvious influence on microstructure of roasting ore.