(東北大學 材料與冶金學院， 沈陽 110004)
摘 要: 通過正交實驗對六方水合鐵酸鈣的合成溫度、 合成時間和合成體系中CaO與Fe2O3的摩爾比及合成體系的攪拌強度等因素對其脫硅效果的影響進行研究， 并給出六方水合鐵酸鈣的最佳合成條件。 結合X射線衍射分析討論水合鐵酸鈣的脫硅機理， 提出水合鐵酸鈣是一種高度分散的含鈣化合物， 其晶面間距較大， 脫硅活性較高， 并可大幅度降低鋁損。 在最佳條件下添加水合鐵酸鈣進行深度脫硅時， 脫硅后鋁酸鈉溶液中的SiO2含量可降低到7 mg/L， 硅量指數(shù)可達14 000， 且脫硅產物中SiO2的飽和系數(shù)可達0.46。
關鍵字: 脫硅； 水合鐵酸鈣； 鋁酸鈉溶液； 合成
and its desilication
（School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China）
Abstract: The effects of temperature, time, mole ratio of CaO to Fe2O3 and agitation strength in the synthesis process of hexagonal calcium hydroferrite on desilication were studied by orthogonal experiments. The optimum synthesis conditions of hexagonal calcium hydroferrite were obtained. The reactive mechanisms on desilication of hexagonal calcium hydroferrite were analyzed by XRD. It is indicated that the hexagonal calcium hydroferrite is a kind of high scattered calciferous compound. The interplanar spacing of hexagonal calcium hydroferrite is wide. The desilication activity of hexagonal calcium hydroferrite is higher. And the loss of alumina can be reduced. The results show that the concentration of SiO2 can reduce to 7 mg/L and the desilication index can reach 14 000 in desilicated sodium aluminate solution with the addition of hexagonal calcium hydroferrite in deep desilication under the optimum conditions. The saturation coefficient in desilication product can reach 0.46.
Key words: desilication; hexagonal calcium hydroferrite; sodium aluminate solution; synthesis
