金属氧化物在氧化铝生产过程中的应用

The Roles of Metallic Oxide in the Proceed of Alumina Production

综述了CaO、MgO、BaO等金属氧化物在氧化铝生产过程中的作用。添加CaO消除了矿浆中不利于氧化铝溶出的因素，使氧化铝溶出速率加快；MgO消除了钛矿物的危害，并使赤泥中硅钠比有所下降；BaO可以同时除去溶液中的SO4^2-、CO3^2-和SiO3^2-离子，其添加量可根据溶液中硫含量多少灵活调节，一般为70％左右最好，而且两次加入可提高BaO利用率。

The roles of lime, magnesium oxide, barium in the proceed of alumina production are described. The additive of lime not only eliminates the factors which is harmful to the extract of alumina, but also accelerates the extracted speed; magnesium oxide removes the mineral of titanium, and decreases the ratio of silicon and natrium; barium can clear up the harmful anions of SO4^2- CO3^2- and SiO3^2- . The new achievements in study of this field both at home and abroad are introduced.