INVESTIGATION OF PROCESS OF NATURAL GRAPHITE SPHEROIDIZATION

IF 0.6 Q4 CHEMISTRY, MULTIDISCIPLINARY

Izvestiya Vysshikh Uchebnykh Zavedenii Khimiya i Khimicheskaya Tekhnologiya Pub Date : 2018-10-23 DOI:10.6060/ivkkt.20186109-10.5883

T. F. Yudina, V. N. Blinichev, Iliya V. Bratkov, T. Gushchina, A. G. Melnikov

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引用次数: 1

Abstract

In this paper, the process of spheroidization of natural graphite powders on an original impact-reflecting mill with internal separation of particles was investigated. It was established that the process of spheroidization of natural graphite by impact depends both on the intensity and duration of mechanical activation. For the type of mill used, the critical linear velocity of the impact elements of the mill rotor, at which the graphite particles can be spheroidized, is 45 m/s. An increase in the linear rotational speed of the mill (intensity of impact) leads to a decrease in the average particle size, an increase in particle roundness, but significantly increases product losses. In the process of mechanical activation by impact, it is possible to increase the coefficient of roundness of the graphite particles to an average value of 0.8-0.9, which leads to compaction of graphite powders. The presence of ash impurities has a negative effect on the ability of natural graphite powders to compact. A mechanism is proposed for the process of spheroidization of graphite particles in a shock-reflecting mill. According to the proposed mechanism, at first, small-sized graphite plates are detached and deformed due to impact. As the free energy accumulates, agglomeration of deformed particles into spheres takes place. With increasing processing time, the surface of the particles is smoothed due to their friction with each other and against the wall of the mill. Powders of spherical graphite obtained by the proposed method have shown the possibility of their use as an anode material of lithium-ion batteries. The type of equipment investigated has made it possible to reduce the required number of pieces of equipment from 20 to 12 impact mills per line in comparison with foreign analogues. For citation: Yudina T.F., Blinichev V.N., Bratkov I.V., Gushchina Т.V., Melnikov A.G. Investigation of process of natural graphite spheroidization. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 9-10. P. 48-52

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天然石墨球化工艺研究

本文研究了天然石墨粉在原装颗粒内分离冲击反射磨机上球化的过程。研究结果表明，天然石墨的冲击球化过程取决于机械活化的强度和持续时间。对于所使用的磨机类型，磨机转子的冲击元件能够使石墨颗粒球化的临界线速度为45米/秒。磨机线性转速(冲击强度)的增加导致平均粒度的减小，颗粒圆度的增加，但显著增加产品损失。在冲击机械活化的过程中，有可能使石墨颗粒的圆度系数提高到0.8-0.9的平均值，从而导致石墨粉的压实。灰分杂质的存在对天然石墨粉的致密性有负面影响。提出了石墨颗粒在冲击反射磨中球化的机理。根据提出的机理，首先，小尺寸石墨板由于撞击而脱落和变形。随着自由能的积累，变形粒子聚集成球体。随着加工时间的增加，由于颗粒之间的摩擦和与磨壁的摩擦，颗粒表面变得光滑。用该方法制备的球形石墨粉末已显示出作为锂离子电池负极材料的可能性。与国外同类产品相比，所研究的设备类型可以将每条生产线所需的设备数量从20台减少到12台。引自:Yudina t.f.， Blinichev v.n.， Bratkov i.v.， Gushchina Т.V。石墨自然球化过程的研究。Izv。Vyssh。Uchebn。Zaved。Khim。Khim。Tekhnol》2018。v . 61。N 9。p - 52

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来源期刊

Izvestiya Vysshikh Uchebnykh Zavedenii Khimiya i Khimicheskaya Tekhnologiya CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

1.40

自引率

44.40%

发文量