需 2011年2月
现代地质 GEOSCIENCE
Na.1 VoL 25
Feb. 2011
霓辉正长岩制取铝酸钠溶液预脱硅的实验研究
丹
王霞，马鸿文，俞子俭，王晓艳，邹
（中国地质大学矿物材料国家专业实验室，北京100083）
摘要：冤辉正长提钾滤渣的主要物相为沸石Na［AISiO]。4H,O，富含氧化铝和氟化硅。采用高压水化学法对其进行赋热浸取可得到高苛性比的铝酸钠溶液，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，影响因索的顺序为：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瘤石；扫描电镜及能谱分析结果显示，生成物水化石橘石的晶型较好，
在晶粒细小处SiO,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：10008527(2011)010157-06
Pre-desilication of Sodium Aluminate Solution from Aegirine-augite
Syenite:AnExperimentalStudy
WANC Xia,MAHong-wen,YUZi-jian,WANGXiao-yan,ZOUDan(Nartional Laboratory of Mineral Materials, China Unipersity of Geosciences, Bejing100083, Chine)
Abstract: The principal phase of potassium-distilled filter residue of aegirine-augite syenite is sodium aluminum silicate hydrate rich in Al, O, and SiOz. 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 follows: 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 hydrogamet 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
0引言
铝及其合金具有许多优良的性能，随着电解
炼铝工业的迅速增长，氧化铝生产迅速发展起来")。在氰化铝生产过程中，铝酸钠溶液中含有以硅酸根或硅铝酸根形式存在的含硅化合物，硅
收稿日期：201004-22；改回日期：2010-12-12；责任编辑：潘令枝。（0900
作者简介：王霞，女，硕，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。
Email; wangxia198431032@ 126. com
通信作者：马鸿文，男，教授，博士生导师，1952年出生，岩石学、矿物学、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、结品岩热力学与相平衡领域的教学与研充。Email；mahw①cugheduen