A special agitator shaft with symmetrically arranged agitator pegs and sleeves of tungsten carbide for wear protection devel- Vertical, batch operation mill for the preparation of tungsten Ideal flow behaviour due to a special agitator peg arrange-ment and the hemispherically shaped chamber floor integrated screen plate for grinding media separationIntensive cooling through a double-wall grinding tank and cooled circulation pipeline
Product inlet via rotor / immersion tube system prevents back flow of grinding media into the feed line.
Generally, there are two ways to obtain nano-powders. A bottom-up manufacturing method (bottom up) for chemical methods, such as chemical precipitation, sol-gel process (sol-gel),... Another method is physical method, which changes the powder particles from big to small (top down), such as mechanical ball milling,... And so on.
The Development In 1963, the first vertical agitator was developed internationally, the first horizontal agitator was developed in 1975, the first horizontal agitator bead mill with eccentric disks was introduced to the public and the horizontal disc grinder was introduced, in 2004, which became the industry standard. In the following years, the grinding media separation systems, the geometry of the grinding disks and the various grinding chamber materials were further developed.
The grinding system pin nanomill shows the evolutionary develop- ment of system with the rotor-slotted pipe separating system. The enclosed horizontal agitator mill is designed for highest product throughput rates and possesses a pin grinding system for highest grinding intensity.
In 2011, we developed the first zirconia comminution chamber technology in China. It has no metal ion pollution and is used in batteries, pharmaceuticals, glazes, ink and food.
研磨介質的選擇
隨著物料的細度要求越來越高,砂磨機的使用也愈來愈普遍,特別是納米粉體的廣泛應用,需要用到高端納米砂磨機,而市場上的研磨介質也比較多,如何選擇一種比較適合自身生產工藝和條件的研磨介質,是一件比較關鍵和費神的事。下面就以下幾方面作簡單的分析。
1、化學組成
研磨介質按材料的不同可分為玻璃珠,陶瓷珠(包括硅酸鋯珠、二氧化鋯珠,二氧化鋁珠,稀土金屬穩定的二氧化鋯珠等)、鋼珠等。
由于化學組成及制造工藝的差異決定了研磨珠的晶體結構,致密的晶體結構保證了珠子的高強度,高耐磨性和低吸油墨等。各種成份的百分比含量的不同決定了研磨珠的比重,高比重為研磨高效率提供了保證;研磨珠的化學組成在研磨過程中的自然磨損對漿料的性能會有一定的影響,所以除了考慮低磨損率外,顧忌的化學元素也是要考慮的因素。如研磨磁帶粉或其他電子元件漿料,金屬Fe、Cu 等元素應避免,含有Fe2O3 或CuSO4 等成份的研磨珠就不在選擇之列,故選擇鋯珠往往是此行業的普遍選擇;如研磨農藥、醫藥和生化方面,重金屬為顧忌元素,而PbO為最常見的成分。
總之,珠子的化學組成所決定的一些物理性能(硬度、密度、耐磨性)和本身的磨耗對漿料的污染情況是選擇研磨介質要考慮的因素。
2、物理性能:
2.1研磨珠的密度
密度在通常的文件中是以比重(真比重)和散重(假比重)來表示,各種氧化物的分子量和百分組成決定了研磨介質的密度,常用的研磨介質的密度如表一所示。