
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.

石墨以其良好的導電性,適合鋰的嵌入-脫嵌的層狀結(jié)構(gòu),良好的循環(huán)性能,成為鋰離子電池的核心原材料之一。近年來,人造石墨、天然石墨及復合石墨均取得了廣泛的應用,隨著鋰電新能源汽車的快速發(fā)展,人造石墨的倍率、循環(huán)特性優(yōu)勢日趨突出,已成為動力電池的主流原材料,在大量商業(yè)化應用的同時,也使其成本受到廣泛的關注,成為研究的熱點。
人造石墨負極材料生產(chǎn)工藝流程主要包含以下4個部分:原材料的粉碎;粉體顆粒的表面改性;石墨化;篩分除磁包裝等工序。近年來,隨著國產(chǎn)針狀焦 技術的成熟及規(guī)模的擴大,石墨化成本已超過原料成本,成為迫切需要解決的問題。
負極材料的石墨化主要設備是艾奇遜爐,參照電極石墨化工藝,將粉體裝入石墨坩堝,由于電阻的作用發(fā)熱升溫,使炭粉在2500~3000 ℃的溫度下,經(jīng)高溫熱處理而轉(zhuǎn)變?yōu)槿嗽焓?nbsp;
但艾奇遜石墨化爐的本身能耗較高,只有30%的電能被用于制品石墨化,并且還伴隨著有害氣體的排放,需要昂貴的配套環(huán)保設施。石墨化過程消耗大量的輔料,有較高的成本壓力。
箱體石墨化以艾奇遜石墨化爐為基礎,在爐內(nèi)設置炭板箱體,相當于坩堝尺寸放大,利用箱體及物料發(fā)熱,可以大幅降低能耗,提高產(chǎn)能。箱體石墨化發(fā)展較快,技術也進一步成熟,工序可實現(xiàn)自動化,已占市場份額20%以上;
連續(xù)石墨化是近年來發(fā)展的一種新技術,采用電阻或感應加熱,最高溫度可達3000 ℃以上,可實現(xiàn)高溫下連續(xù)式進料和出料,減少了能源消耗,縮短生產(chǎn)周期,現(xiàn)場作業(yè)環(huán)境良好。
為了更好發(fā)揮石墨在負極材料中的性能,需要對石墨進一步砂磨,砂磨機研磨后的石墨會得到更大的比表面積和扁平比。