A method for preparing high-purity graphite in high-temperature vacuum
A high-purity graphite, high-temperature vacuum technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of high production cost, high pollution, high energy consumption, etc., and achieve low equipment requirements, low energy consumption, and energy consumption low effect
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Embodiment 1
[0051] The main components (dry basis) of the raw graphite powder used are shown in Table 1.
[0052] The composition / wt% of raw material graphite powder of table 1
[0053] C al 2 o 3
CaO Fe 2 o 3
K 2 o
P 2 o 5
Rb 2 o
SO 3
SiO 2
MgO margin 0.14 0.11 0.32 0.083 0.086 0.0009 0.12 0.49 0.05
[0054] In the first step, dextrin is used as the binder, and the amount of the binder added is 3% of the mass of the graphite powder, and small balls of 1 mm to 20 mm are formed through high-speed rotary granulation, and the unqualified ones are remolded;
[0055] High-speed rotary granulation is continuous feeding and discharging. The dextrin and graphite powder are mixed in the conical mixer for 30-60 minutes, then added to the high-speed rotary granulator, and sprayed with water quantitatively, so that the dextrin and graphite powder can be quickly Bonded into small balls, the speed of the high-speed rotary gr...
Embodiment 2
[0060] The main components (dry basis) of the graphite raw materials used are shown in Table 2.
[0061] The composition / wt% of raw material graphite powder of table 2
[0062] C Al 2 o 3
CaO Fe 2 o 3
K 2 o
P 2 o 5
Rb 2 o
SO 3
SiO 2
MgO margin 0.67 0.55 0.45 0.092 0.012 0.001 0.15 1.02 0.35
[0063] In the first step, bentonite is selected as the binder, and the amount of the bentonite binder is 2.5% of the mass of the graphite powder. Form pellets of 1mm to 20mm through a disc pelletizer;
[0064] The disc pelletizing machine is continuous feeding and discharging. Bentonite and graphite powder are mixed in the conical mixer for 30-60 minutes, then added to the disc pelletizing machine, and quantitatively sprayed with water, so that bentonite and graphite powder can be rapidly formed. , The speed of the disc granulator is about 20-50 revolutions per minute, and the forming rate of graphite pellets ...
Embodiment 3
[0069] The graphite raw material composition (dry basis) used is shown in Table 2.
[0070] In the first step, a mixed binder of water glass and dextrin is selected, and the dosages of water glass and dextrin are respectively 1.5% and 1% of the graphite powder mass. Formed by a rolling ball machine to form an ellipsoid, a small ball with an equivalent diameter of 15mm;
[0071] The rolling ball machine is continuous feeding and discharging. The water glass, dextrin and graphite powder are mixed in the conical mixer for 30-60 minutes, then added to the rolling ball machine, and quantitatively sprayed with water, so that the material can be formed quickly. The speed of the rolling ball machine is about 5 to 20 revolutions per minute, and the molding rate of graphite balls is high at this speed.
[0072] The second step is to dry the formed graphite pellets with tunnel drying equipment at a drying temperature of 130-150°C and a drying time of 100-200 minutes to reduce the moistu...
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