研磨介质对高岭土湿法超细研磨效果的影响

第33卷第4期非金属矿V ol.33 No.4 2010年7月Non-Metallic Mines July, 2010

高岭土是一种硅酸盐矿物,其理论结构式为Al4(Si4O10)(OH)8,由于其含水的铝硅酸盐化学成分和层状结构特性,使其具有许多一般矿物所不具备的特殊性质[1]。

煅烧高岭土是我国近年来发展很快的一个新领域,超细粉碎是其主要加工工序之一,经湿法超细粉碎后的煅烧高岭土,可生产出高附加值、有广阔市场的产品。在湿法超细粉碎加工过程中,其主要设备是超细搅拌磨或砂磨机[2]。

在研磨设备确定的条件下,影响高岭土超细研磨效果的主要因素是原料的性质、研磨介质制度及磨机操作因素。其中研磨介质制度对超细研磨效率、产物细度及粒度分布等有重要影响[3-5]。本实验以超细砂磨机为湿式超细研磨设备,深入研究了研磨介质制度对煅烧高岭土超细研磨效果的影响[6]。

1?原料、设备和研究方法

1.1 原料本实验用煅烧高岭土由江苏宜兴市

耀辉化工厂提供,原料的粒度组成:D50=1.95 μm,D97=13.38 μm,-1μm含量为32.71 %,白度为89.2 %。

实验用研磨介质由江苏锡阳研磨科技有限公司提供,其种类和规格如下:①氧化铝陶瓷微珠:密度2.66 g/cm3,粒径0.6~1 mm,1.5~2 mm,2.5~3 mm;②氧化铝、氧化锆复合陶瓷微珠:密度4.00 g/cm3,粒径0.6~1 mm;③氧化锆陶瓷微珠,密度6.00 g/cm3,粒径

0.6~1 mm。

1.2 设备超细研磨设备为实验型SDF分散砂磨机。其主要操作参数:电机功率400 W,容积1.2 L。试验过程中转速恒定为2000 r/min。

1.3 试验方法

①采用粒径分别为0.6~1 mm、1.5~2 mm、

2.5~3 mm的3种粒径氧化铝陶瓷介质进行级配试验研究。3种介质的质量比分别为(1∶1∶6)、(1∶3∶4)、(1∶5∶2),(3∶1∶4)、(3∶3∶2)、(5∶1∶2),(8∶0∶0)、(0∶8∶0)、(0∶0∶8)。

②在适宜的介质级配条件下,研磨介质/ 物料质

研磨介质对高岭土湿法超细研磨效果的影响

徐荣声?刘福来?郑水林?吴翠平?杨?涛?胡?炜

(中国矿业大学(北京)化学与环境工程学院,北京100083)

摘?要高岭土是一种重要的工业矿物原料,超细粉碎是高岭土最重要的深加工技术之一。研磨介质是影响搅拌磨超细粉碎效果最主要的因素之一。本实验采用实验型SDF砂磨机为湿法超细研磨设备,研究了介质级配、介质密度及介质/物料配比对煅烧高岭土超细研磨效果的影响。结果表明,在磨矿的起始阶段,粒径大的研磨介质的研磨效果较好,但随着磨矿过程的进行,粒径小的研磨介质的研磨效果较好,直至磨矿结束。在介质体积相同时,介质密度越大,磨矿效率越高;在介质质量相同时,介质密度越小,研磨效率越高。煅烧高岭土湿法超细研磨的适宜介料比为5∶1。

关键词高岭土湿法超细粉碎研磨介质

中图分类号:TD97文献标识码:A文章编号:1000-8098(2010)04-0039-03

Effect of Gringing Media System on Wet Ultra-fine Grinding of Kaolin

Xu Rongsheng Liu Fulai Zheng Shuilin Wu Cuiping Yang Tao Hu Wei

(School of Chemical and Environmental Engineering,China University of Mining and Technology, Beijing 100083) Abstract Kaolin is an important industrial mineral raw materials, and one of the most important further processing technology of kaolin is ultra-fine grinding. Grinding medium is one of the most important influential factors for ultra-fine grinding effect of stirred mill. The experiment had used the experimental SDF sand mill as the wet ultra-fine grinding equipment, had studied the effect of medium's gradation, medium's density and the ratio of medium to feed on calcinated kaolin's wet ultra-fine grinding. The results showed that, at the initial stage of grinding, the grinding efficiency of the large particle's grinding medium is better than the smaller one, but with the grinding goes on, the grinding efficiency of the smaller one becomes better than the larger one, till the end. When the volume of medium is at the same level, the larger the medium's density is, the higher the grinding efficiency is. When the quality of medium is at the same level, the smaller the medium's density is, the higher the grinding efficiency is. The suitable ratio of medium to feed of calcinated kaolin's wet ultra-fine grinding is 5∶1.

Key words kaolin wet ultra-fine grinding grinding medium

收稿日期:2010-05-14

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