Graphite purification method
A graphite purification and graphite technology, applied in the field of ion exchange resin purification of natural graphite, can solve the problems of pollution, time-consuming, high energy consumption of the purification process, etc., and achieve the effects of simple operation process, low equipment investment cost, and short process processing time.
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Embodiment 1
[0012] Use natural graphite with a carbon content of 85% to 95% as raw material, mix it with 30% to 38% sodium hydroxide solution at a mass ratio of 1:1, and rise from room temperature at a rate of 3 to 5min / s to 450-650°C, and keep at this temperature for 60-90 minutes; after the reaction, cool to room temperature, and wash the prepared sample with high-purity water until neutral; mix the sample with 8%-10% hydrochloric acid in a mass ratio of 1:3.84, Stir at ℃ for 4 hours; filter the solution after the reaction, and wash the sample with high-purity water to neutral, and AgNO 3 Detect the absence of Cl in the filtrate - ; put the above-mentioned graphite sample and high-purity water in a beaker and form a closed loop with the two poles of the DC power supply. Constant voltage, and act for 30 to 60 minutes, graphite is automatically adsorbed on the two poles under the action of an external electric field, in which the heteroions and the H of the ion exchange resin + or OH -...
Embodiment 2
[0014] The difference between this embodiment and embodiment 1 is: use natural graphite with a carbon content of 90% as raw material, mix it with 30% sodium hydroxide solution in a mass ratio of 1:1, and use 5min / s The rate was increased from room temperature to 450°C and maintained at this temperature for 60 minutes. This embodiment shortens the reaction time between sodium hydroxide and graphite and lowers the reaction temperature, which can reduce the degree of corrosion to equipment and still achieve corresponding technical effects. After purification by the above method, the fixed carbon content in graphite is 99.9%. The alkaline leaching of graphite to remove impurities plays an important role in the whole purification process, but usually requires higher temperature and longer reaction time. Since the application of ion exchange resin purification under the assistance of an external DC electric field has a better purification effect, the reaction time and temperature c...
Embodiment 3
[0016] The difference between this example and Example 1 is that the water treatment anion exchange resin described in Example 1 is one of 210×4 or 210×7 or D201 or D202.
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