Purification method of nano diamond ash material

[0014] Embodiment 1: purify nano-diamond dust material according to the following steps

[0015] (1) Removal of metal impurities: In a 50L reaction kettle, add 25.0kg of 20% nitric acid, add 5.00kg of nano-diamond ash material under stirring, and heat up to 70 o C, stirred for 48h, cooled to room temperature, vacuum filtered, and fully washed with deionized water to neutrality, the solid matter at 80 o C is vacuum-dried to obtain 4.22kg of a purified product; yield 84.4%;

[0016] (2) Removal of graphite carbon impurities: In a 50L reactor, put 10.0kg of sulfuric acid with a mass concentration of 98%, add 3.00kg of a purified product under stirring, and heat up to 250 under vacuum o C, dropwise add 16.0kg of mass concentration 70% perchloric acid, control the temperature in the kettle to 200°C during the dropwise addition process o C, the dropwise addition was completed in 8 hours, and then 250 o C for 1 hour, cool to 40 o C, poured into 50L deionized water, filtered, and ful

[0018] Embodiment 2: purify nano-diamond dust material according to the following steps

[0019] (1) Removal of metal impurities: In a 50L reaction kettle, add 40.0kg of 5% nitric acid, add 5.00kg of nano-diamond ash material under stirring, and heat up to 95 o C, stirred for 1h, cooled to room temperature, vacuum filtered, and fully washed with deionized water to neutrality, the solid matter at 80 o C is vacuum-dried to obtain 4.02kg of a purified product; yield 80.4%;

[0020] (2) Removal of graphite carbon impurities: In a 50L reactor, put 15.0kg of sulfuric acid with a mass concentration of 94%, add 1.00kg of a purified product under stirring, and heat up to 180 under vacuum o C, dropwise add 55% perchloric acid with a mass concentration of 20.0kg, and control the temperature in the kettle to 180-230°C during the dropwise addition process o C, the dropwise addition was completed in 7 hours, and then 210 o C for 5 hours, cool to 40 o C, poured into 60L deionized water, fil

[0022] Embodiment 3: purify nano-diamond dust material according to the following steps

[0023] (1) Removal of metal impurities: In a 50L reactor, add 20.0kg of 50% nitric acid, add 4.00kg of nano-diamond ash material under stirring, and control the temperature for 10 o C, stirred for 24h, cooled to room temperature, vacuum filtered, and fully washed with deionized water to neutrality, the solid matter at 80 o C is vacuum-dried to obtain 3.66kg of a purified product; yield 91.5%;

[0024] (2) Removal of graphite carbon impurities: In a 50L reactor, put 40kg of sulfuric acid with a mass concentration of 90%, add 2.00kg of a purified product under stirring, and heat up to 180 under vacuum o C, dropwise add 15kg of 40% perchloric acid in mass concentration, and control the temperature in the kettle to 170-210°C during the dropwise addition process o C, then 180 o C for 10 hours, cool to 40 o C, poured into 100L deionized water, filtered, and fully washed with deionized water un