北海高岭土除铁技术研究.pdf

第37卷第3期
非金属矿
Vol 37 No.3
2014年5月
Non-metallic Mines
May,2014
こ,
北海高岭土除铁技术研究
蔡建冯欲晓仇秀梅
(1苏州中材非金属矿工业设计研究院有限公司,江苏苏州215004;2内蒙古乌海市天字高岭土高新科技有限公司,内蒙古
乌海0160003中国地质大学(武汉)材料与化学学院,湖北武汉430074)
摘要以广西北海高岭土为研究对象,采用Ⅹ射线衍射、描电子显微镜、ⅹ射线荧光光谱仪等手段对北海高岭土进行系统的矿物学研
究,包括化学组成、形貌和物相组成等。对其50m水力旋流器溢流及底流产品进行高岭土除铁增白试验研究。采用“擦洗筛分一高梯度磁
”工艺,得到最佳磁选条件为:磁感应强度1.4T,矿浆流速0.8cm/s,求料质量分数15%。磁选高岭土产品1180℃烧成白度可由72.9%提高到
90.4%,Fe2O2由0.99%降低到0.40%,铁去除率达59,6%,可以满足橡塑填料和高档陶资等领域的应用要求。
关键词高岭土高梯度磁选除铁矿物特征
中图分类号:TD973.2文献标识码:A文章编号:10008098(2014)03-0050-04
Study on Tron Removal of Kaolin from Beihai
1o Qiu
(1 Suzhou inoma Design Research Institute of Non-mc alli Minerals Industry o t Suzhou, Jiangsu 215004; 2 Inner Mongolia Tianyu
Kaolin High-tech Co. d, Wuhai Nei Mongol 16000 3 Faculty of Material Science and hemistry, China University of Geosciences(Wuhan)
Wuhan, Hubei 430074)
Abstract The kaolin from Beihai was determined as the object of study. The chemical composition, morphology and phase composition of
Beihai kaolin was measured by XRD, SEM, XRI, and so on. The iron removal and whitening experiments of overlow and underflow product of
o50 mm hydrocyclone were studied. The technological process was scrub screening first and then magnetic separation. The best conditions of magneti
separation were: magnetic field intensity was 1.4 T, slurry flow velocity was 0.8cm/, solid content of slurry was 15%. The calcined whiteness at
1180C of magnetic kaolin product increased from 72. 9%to 90.4%, Feo, decreased from 0.99%to.40%, the removal rate of Fe was 59.6%. The
kaolin production ofmagnetic separation can sais y the requirements of some fields such as rubber and plastic and ceramic flings
Key words kaolin high-gradient magnetic separation iron removal mineral characteristics
北海高岭土矿是近十几年以来国内新发现的一
实验部分
个特大高岭土矿床。该矿床为加里东晚期的那车垌1.1原料高岭土,来自广西北海清水江矿区,呈灰
钾长石花財经漫长的地质变化,钾长花岗岩经断裂构白色,粗细粒均较多。原矿XRD分析见图1。粗粒矿
造活动、岩石碎裂、蚀变糜棱岩化,长石等矿物进一步物主要为石英、长石,细粒矿物主要为伊利石、高岭石
风化,KO、Na2O、SiO2、Fe2O)3流失,高岭石等黏土矿等。原矿矿物组成(w0)为:石英,30.17;长石,10
物相对残积聚积成矿,属风化残积型砂质高岭土。已高岭石,14.23;伊利石,54.57。原矿SEM形貌见图
经探明储量约4亿吨,资源丰富,但存在自然白度、烧2。矿物电镜下呈片状形态。原矿化学组成(w%)为
成白度低等劣势,从而限制其在橡胶、涂料高档陶瓷SiO2,75.49;A1O3,15.47;TFe2O3,0.7;MgO,0.099;
等领域的使用。目前,可通过磁选除铁漂白除铁CaO,0.084;Na_O,0.083;KO,2,64;1TiO2,0068;P2O3,
4?以及生物除铁明等技术提高高岭土产品的白度,0.28;MnO20014;烧失量,5,18。其中SiO2含量高达
并达到相关指标要求。
本实验以北海高岭土为研究对象,采用XRD
SEM、XRF等手段对原矿进行系统的矿物学研究
根据矿物学研究的成果,对50mm水力旋流分级
的溢流和底流产品进行高梯度磁选实验,探讨磁场强
度、浆料固含量、浆料流速对磁选效果的影响。研究
高岭土矿中铁、钛的赋存状态。
收稿日期:2014-03-18
图1高岭土原矿XRD图谱