Method and device for producing high-purity natural graphite

[0019] Example 1

[0020] Weigh natural graphite powder with a purity of 90%-98%, and start a special device for producing high-purity natural graphite (see figure 1 ), argon pressure: 0.8MPa, powder feeding rate 100g/min, cooling water flow rate: 1.2M/s, using 80KW plasma generator, adjust its working current 20-60A, working voltage: 30-50V, make the plasma generator A high temperature zone of 3000-3600°C is generated between the cathode and anode. The gas and powder passages are designed in the insulator. The inner diameter of the gas and powder passages: 10mm. The inert gas argon is used to carry the natural graphite powder into the plasma generator. The natural graphite powder passes through the cathode and anode of the plasma generator at a high temperature of 300-3600℃. Time, so that all the ash in the graphite (mainly containing SiO 2 , A1 2 O 3 , Fe 2 O 3 , CaO, MgO) gasification and volatilization; during the purification process, natural graphite powder is always protected by inert gas. The test results show that the purity of graphite quality is more than 99.9%, and the original crystalline structure of graphite has not changed.

[0021] Example 2

[0022] Start the production of high-purity natural graphite special equipment (see figure 2 ), nitrogen pressure: 0.8MPa, powder feeding rate 145g/min, cooling water flow rate: 1.45M/s, using 80KW plasma generator, adjusting its working current 60-75A, working voltage: 50-80V, make the plasma generator A high temperature zone of 3600-4000℃ is generated between the cathode and anode. The gas channel 2.2 is still in the insulator 7, and the powder channel 2.3 is opened in the trapezoidal opening section of the upper part of the anode 1. The inner diameter of the gas and powder channels are both 10mm. The inert gas argon is used to carry the natural graphite powder into the plasma generator, and the natural graphite powder is passing through In the high temperature zone of 3600-4000℃ generated by the cathode and anode of the plasma generator, all the ash in the graphite (mainly containing SiO 2 , A1 2 O 3 , Fe 2 O 3 , CaO, MgO) gasification and volatilization; during the purification process, natural graphite powder is always protected by inert gas. The test results show that the purity of graphite quality is more than 99.9%, and the original crystalline structure of graphite has not changed.