METHOD OF PRODUCING PARTICLES OF SPHERICAL GRAPHITE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC C01B32/21 B02C7/08 B02C13/18 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry and can be used for making electrode materials of chemical current sources. Device for producing particles of spherical graphite comprises housing 2 with loading 1 and unloading 9 devices, as well as rotor 4. Housing 2 and rotor 4 are made three-staged. Rotor 4 is equipped with spheroidizing disks 5 with hubs, on which beater 6 is rigidly fixed. Ratio of dimensions of discs 5 from top to bottom is 1:1.3:1.6, diameter of bottom disc is 350 mm. Middle and lower spheroidizing disks 5 contain six separation holes 7 with diameter of 30–40 mm located at distance of 1/3 of diameter from axis of rotor 4. On inner surface of stepped housing 2 every 50 mm there are baffles 3 with height of 10–12 mm. Unloading device 9 is made in housing 2 bottom cover and is installed at the distance from its lower step edge, which is equal to the sum of height of baffle plates 3 and beater bit 6 of lower stage 4. Loading 1 device is installed in the center of upper part of housing 2 coaxially with axis of rotation of rotor shaft 4. Initial natural graphite is loaded through loading device 1 and subject to impact-reflective grinding with increase of loading speeds at each step by 30–35 % of speed at previous stage of processing equal to 30–100 m/s per one pass. After that, ground graphite is passed through said device 5–10 times with lower loading speeds, at that at the last step the loading rate is 40–50 m/s to create conditions of rolling, granulation and point "sticking" of flat flake particles of different sizes from 1.5 to 80 mcm into formed graphite granules with size of 5–50 mcm. Sharp angles of granules are subjected to abrasion in zones of intense turbulent rotation, which are located near baffle plates 3.

EFFECT: invention allows to intensify grinding process, increase content of particles with high degree of sphericity to 55 % of total weight of treated particles of graphite, increase output of finished product, reduce specific power consumption.

2 cl, 8 dwg, 1 tbl, 2 ex