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.
石墨以其良好的导电性,适合锂的嵌入-脱嵌的层状结构,良好的循环性能,成为锂离子电池的核心原材料之一。近年来,人造石墨、天然石墨及复合石墨均取得了广泛的应用,随着锂电新能源汽车的快速发展,人造石墨的倍率、循环特性优势日趋突出,已成为动力电池的主流原材料,在大量商业化应用的同时,也使其成本受到广泛的关注,成为研究的热点。
人造石墨负极材料生产工艺流程主要包含以下4个部分:原材料的粉碎;粉体颗粒的表面改性;石墨化;筛分除磁包装等工序。近年来,随着国产针状焦 技术的成熟及规模的扩大,石墨化成本已超过原料成本,成为迫切需要解决的问题。
负极材料的石墨化主要设备是艾奇逊炉,参照电极石墨化工艺,将粉体装入石墨坩埚,由于电阻的作用发热升温,使炭粉在2500~3000 ℃的温度下,经高温热处理而转变为人造石墨。
但艾奇逊石墨化炉的本身能耗较高,只有30%的电能被用于制品石墨化,并且还伴随着有害气体的排放,需要昂贵的配套环保设施。石墨化过程消耗大量的辅料,有较高的成本压力。
箱体石墨化以艾奇逊石墨化炉为基础,在炉内设置炭板箱体,相当于坩埚尺寸放大,利用箱体及物料发热,可以大幅降低能耗,提高产能。箱体石墨化发展较快,技术也进一步成熟,工序可实现自动化,已占市场份额20%以上;
连续石墨化是近年来发展的一种新技术,采用电阻或感应加热,最高温度可达3000 ℃以上,可实现高温下连续式进料和出料,减少了能源消耗,缩短生产周期,现场作业环境良好。
为了更好发挥石墨在负极材料中的性能,需要对石墨进一步砂磨,砂磨机研磨后的石墨会得到更大的比表面积和扁平比。