Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第7期    总第88期    2006年7月

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文章编号: 1004-0609(2006)07-1306-05
六方水合铁酸钙的合成及其脱硅
李来时, 翟玉春, 刘瑛瑛, 王佳东

(东北大学 材料与冶金学院, 沈阳 110004)

摘 要:  通过正交实验对六方水合铁酸钙的合成温度、 合成时间和合成体系中CaO与Fe2O3的摩尔比及合成体系的搅拌强度等因素对其脱硅效果的影响进行研究, 并给出六方水合铁酸钙的最佳合成条件。 结合X射线衍射分析讨论水合铁酸钙的脱硅机理, 提出水合铁酸钙是一种高度分散的含钙化合物, 其晶面间距较大, 脱硅活性较高, 并可大幅度降低铝损。 在最佳条件下添加水合铁酸钙进行深度脱硅时, 脱硅后铝酸钠溶液中的SiO2含量可降低到7 mg/L, 硅量指数可达14 000, 且脱硅产物中SiO2的饱和系数可达0.46。

 

关键字:  脱硅; 水合铁酸钙; 铝酸钠溶液; 合成

Synthesis of hexagonal calcium hydroferrite
 and its desilication
LI Lai-shi, ZHAI Yu-chun, LIU Ying-ying, WANG Jia-dong

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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