霓辉正长岩制取铝酸钠溶液预脱硅的实验研究.pdf

第25卷第1期
现代地质
Vol 25 No. 1
2011年2月
GEOSCIENCE
Feb,2011
霓辉正长岩制取铝酸钠溶液预脱硅的实验研究
王霞,马鸿文,俞子俭,王晓艳,邹丹
(中国地质大学矿物材料国家专业实验室,北京10003)
摘要:霓辉正长岩提钾滤渣的主要物相为沸石Na[ Alsio]4H2O,富含氧化铝和氧化硅。采用高压水化学法对其进行
碱热浸取可得到高苛性比的铝酸钠浴液,通过添加不同类型的脱硅剂对其进行一步脱硅法对比实验研究。正交实验结
果表明,在脱硅的过程中,影响因素的顺序为:脱硅剂类型>脱硅时间>脱硅温度。通过进一步单因素实验,确定优
化脱硅条件为:采用水合铝酸钙为脱硅剂,在160℃下反应3.5h,即可制得硅量指数大于1800的铝酸钠精制液。经X
射线衍射分析,脱硅产物的主要物相为水化石榴石;扫描电镜及能谱分析结果显示,生成物水化石榴石的晶型较好
在晶粒细小处SiO2杂质容易附着,从而达到更好的脱硅效果。
关键词:霓辉正长岩;预脱硅;脱硅剂;水化石榴石
中图分类号:P578.968;TQ170.4
文献标志码;A
文章编号:1000~8527(2011)01-0157-06
Pre-desilication of Sodium Aluminate Solution from Aegirine-augite
Syenite: An Experimental Study
WANG Xia, MA Hong-wen, YU Zi-jian, WANG Xiao-yan, ZOU Dan
(ational Laboratory of Mineral Materials, Chi nosy of Oscines, Beijing 100083, China)
Abstract The principal phase of potassium-distilled filter residue of aegirine-augite syenite is sodium aluminum
silicate hydrate rich in AL, 0, and Si0. The high caustic ratio sodium aluminate solution was obtained from filter
residue treated by high pressure hydrochemical process. The desilication reaction was experimentally studied by
adding different types of desilication agents. The orthogonal experimental results show that in the process of the
desilication from sodium aluminate solution, the descending order of affecting factors is as follow: desilication
agent type, desilication time, desilication temperature. The optimal conditions of desilication are that the desili-
cation agent is tricalcium hydroaluminate, and desilication temperature is 160 C and the desilication time is
3. 5 h. The silicon index of the refined aluminate solutions was obtained to be above 1, 800 by one-step desilica-
tion procedure. According to X-ray diffraction analysis, the major phase of derived products is hydrogarnet. The
diffraction intensity of hydrogarnet increases sharply with the desilication time increasing. The results of scanning
electron microscopy and EDS analysis show that hydrogarnets reveal high crystallinity and perfect fine-grains, and
Sio, impurities easily attached with the small crystals, so a better effect of silicon removal is achieved
Key words: aegirine-augite syenite; pre-desilication; desilication agent; hydrogarnet
炼铝工业的迅速增长,氧化铝生产迅速发展起
来叫。在氧化铝生产过程中,铝酸钠溶液中含有
铝及其合金具有许多优良的性能,随着电解以硅酸根或碓铝酸根形式存在的含硅化合物,硅
收稿日期:2010-04-22;改回日期:2010-12-12:费任编辑:潘令枝。
基金项目:“十ー五”国家科技支撑计划课(2006 BADIOR044)。
作者简介:王莨,女,硕士,1984年出生,材料科学与工程专业,主要从事矿物材料学的研究。
Ernail:wangxial98431032@126.como
通信作者:马鸿文,男,教投,博士生导师,1952年出生,岩石学、旷物学、材料学专业,主要从事矿物材料科学及制备技
术、硅酸盐体系化学平衡与材料设计、结晶岩热力学与相平衡领域的教学与研究。 Email.;mehw@cugb. edu, cn
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