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

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第12期    总第165期    2012年12月

[PDF全文下载]        [Flash在线阅读]

    

文章编号:1004-0609(2012)12-3542-06
铬酸钠溶液中和除铝浆液沉降性能的改善
刘桂华,李云峰,齐天贵,张玉峰,李小斌

(中南大学 冶金科学与工程学院,长沙 410083)

摘 要: 研究铬酸钠碱性液中和除铝方式、温度和碱性液种类对除铝浆液沉降性能的影响规律。结果表明:晶种中和法获得的铝泥前2 min平均沉降速率达107.1 mm/min,含水率小于38%,铬带损小于0.26%;而采用传统的直接中和法获得的铝泥前2 min平均沉降速率小于7.25 mm/min,含水率大于67%。氢氧化铝粒度分布、扫描电镜和接触角测定结果表明:提高中和除铝的温度、降低碱性液SiO2等杂质含量有利于改善除铝浆液的沉降性能。铝泥颗粒粗、结晶好,且其表面疏水性强、表面能低、溶剂化趋势小,能提高铝泥的沉降性能。

 

关键字: 铬酸钠溶液;中和;除铝;沉降性能;接触角;表面性质

Improvement in settlement property of alumina tri-hydrate slurry by neutralization in sodium chromate solution
LIU Gui-hua, LI Yun-feng, QI Tian-gui, ZHANG Yu-feng, LI Xiao-bin

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:The influence of neutralization method, temperature and types of chromate solution on the settlement property of alumina tri-hydrate was studied in the removal of alumina from chromate solution. The results show that the average settlement rate of alumina tri-hydrate is up to 107.1 mm/min in initial 2 min, and water content and loss of chromate in alumina tri-hydrate is less than 38% and 0.26%, respectively by seeded neutralization. In contrast, the average settlement rate of alumina tri-hydrate is less than 7.25 mm/min in initial 2 min period, and water content is more than 67% by traditional direct neutralization process. In addition, increasing temperature or removing SiO2 in solution benefits the improvement of the settlement property for alumina tri-hydrate in the seeded neutralization process. Based on the measurement of the contact angle, particle size distribution and SEM, the results also indicate that the better settlement property of alumina tri-hydrate can be attributed to coarse particle, good crystallization, hydrophobic, low surface free energy and little solvent tendency of alumina tri-hydrate in the removal of alumina in chromate solution.

 

Key words: sodium chromate solution; neutralization; alumina removal; settlement property; contact angle; surface property

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

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

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com