提出一种以日云石和菱镁石的混合矿物为原料、以铝粉为还原剂的具空热还原炼镁,然后利用镁还原后的残渣制取氢氧化铝的工艺和技术,并进行实验研究.结果表明:以煅烧后的白云石和菱镁石混合矿物为原料的真空金属热还原炼镁,在还原温度为1 200℃、还原时间为2h、铝粉过量系数为5％的条件下,镁的还原率可达89％以上,还原渣主要物相为CaO·2Al2O3,还原渣中Al2O3的含量为67％左右；该炼镁还原渣经碳酸钠和氢氧化钠的混合碱液浸出后,Al2O3的浸出率达到85％,浸出Al2O3后渣的主要成分为CaCO3;浸出液中的Al2O3以可溶解的铝酸钠存在于浸出液中,后经碳分分解制得氢氧化铝,氢氧化铝的白度达到97％.
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