CN107601493B - Method for preparing high-purity graphite by combining secondary acid leaching with thermal activation - Google Patents
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 149
- 239000010439 graphite Substances 0.000 title claims abstract description 149
- 239000002253 acid Substances 0.000 title claims abstract description 125
- 238000002386 leaching Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000007725 thermal activation Methods 0.000 title claims abstract description 45
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 86
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000001035 drying Methods 0.000 claims abstract description 26
- 238000001994 activation Methods 0.000 claims abstract description 16
- 230000004913 activation Effects 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000005406 washing Methods 0.000 claims abstract description 14
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 238000007598 dipping method Methods 0.000 claims abstract 2
- 239000012498 ultrapure water Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000002791 soaking Methods 0.000 description 23
- 238000000746 purification Methods 0.000 description 21
- 229910052799 carbon Inorganic materials 0.000 description 16
- 229910021382 natural graphite Inorganic materials 0.000 description 14
- 239000002994 raw material Substances 0.000 description 13
- 239000012535 impurity Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007123 defense Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
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- 230000001681 protective effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012932 thermodynamic analysis Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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Abstract
The invention discloses a preparation method of high-purity graphite, and particularly relates to a method for preparing high-purity graphite by combining secondary acid leaching with thermal activation, which comprises the following steps: grinding and crushing graphite; primary acid leaching: dipping graphite in mixed acid formed by hydrofluoric acid and sulfuric acid; and (3) heat activation treatment: filtering graphite from the mixed acid, and performing thermal activation treatment; secondary acid leaching: after the thermal activation treatment is finished, cooling, and performing secondary acid leaching on the graphite, wherein the secondary acid leaching solution is mixed acid of hydrofluoric acid and sulfuric acid; filtering graphite from the acid leaching solution, washing and drying to obtain the graphite. The purity of the graphite purified by the method can reach more than 99.99 percent.
Description
Technical Field
The invention relates to a graphite purification method, in particular to a method for preparing high-purity graphite by combining secondary acid leaching with thermal activation.
Background
Graphite is a crystalline mineral of carbonaceous elements, and is widely used in many fields such as metallurgy, chemical industry, petroleum, machinery, national defense advanced technology, aviation industry, light industry and the like due to its excellent electrical conductivity, thermal conductivity, plasticity, lubricity and high temperature resistance. Graphite is used mainly as a refractory material in the metallurgical industry; graphite is mainly used as a raw material for producing batteries, electrodes and various carbon products in the chemical industry; the appearance and rapid development of graphene in the field of petroleum accelerates the development of the later petroleum era and solves the huge energy problem; graphite is mainly used as a carbon-graphite material for various structural parts in the mechanical field; graphite can be used as a neutron moderator and a protective material of an atomic reactor in the national defense advanced technology; graphite is used in the aerospace industry as a heat insulating, heat resistant material for missiles and rockets and as a material for electrical signal and conductive structures for radio links; graphite is used in the light industry as a raw material for manufacturing pencils, inks and synthetic diamonds, and also as a rust preventive and polishing agent for paper and glass. With the development of modern industry and modern science and technology, graphite is widely applied to other fields, but the fixed carbon content in the graphite required by the industries is up to more than 99.9%, and the carbon content in the graphite subjected to natural mining and mineral processing at present can reach 95% at most, so that the requirement of national production is difficult to meet. Therefore, it is very important to purify high-purity graphite.
The prior method for purifying graphite generally comprises an acid-base method, a high-temperature roasting method, a chlorine roasting method, a hydrofluoric acid method and the like. The purification of graphite by an acid-base method requires high-temperature calcination, and has long time and large energy consumption; the high-temperature roasting method has the advantages that the heat required for purifying graphite is very large, so that the energy consumption is large, the cost is high, the high-temperature resistance of equipment is extremely high, and the cost is further increased; the chlorine roasting method has serious environmental pollution due to strong chlorine and strong corrosivity; the purification of graphite by hydrofluoric acid is a good purification method, but the purification of graphite is difficult to reach more than 99.99%.
Disclosure of Invention
The invention provides a preparation method of high-purity graphite, aiming at solving the problems of high energy consumption, long service life and environmental pollution of the existing graphite purification method, and the purity of the graphite prepared by the method reaches more than 99.99 percent.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method for preparing high-purity graphite by an HAH method (a method for preparing high-purity graphite by combining secondary acid leaching with thermal activation) comprises the following steps:
(1) the method comprises the steps of taking natural graphite as a raw material, rolling and crushing the natural graphite, soaking the natural graphite in a mixed acid solution with hydrofluoric acid concentration of 5-10% and sulfuric acid concentration of 30-50%, carrying out thermal activation treatment on the natural graphite after the steps are completed, loading the graphite into a high-purity graphite crucible with a cover, placing the graphite crucible in a box type high-temperature resistance furnace, carrying out thermal activation treatment on the graphite crucible, wherein the thermal activation temperature is 700-800 ℃, and the activation time is 55-65 min.
Because any silicate can be dissolved by hydrofluoric acid under a certain condition, the purpose of purification is achieved by utilizing the reaction of impurities in the graphite and the hydrofluoric acid to generate fluoride and volatile matters which are dissolved in water. Research shows that when the concentration of hydrofluoric acid is less than 2.5%, the purity of graphite is continuously improved along with the temperature increase, and when the concentration of hydrofluoric acid is more than 5%, the purity of graphite is slightly changed; when the concentration of the primary acid leaching sulfuric acid is lower than 30%, the purity of the graphite is continuously improved along with the increase of the concentration of the sulfuric acid, and when the concentration is higher than 30%, the purity of the graphite is not greatly changed;
the acid leaching temperature of the acid leaching solution is 70-75 ℃, and the temperature can enable the activity of impurities in the graphite to reach the highest, so that the acid leaching time is effectively reduced, and the time consumption of operation is shortened;
the acid leaching time of the primary acid leaching solution is 2-4 h, when the primary acid leaching time is less than 2h, the graphite purity is continuously improved along with the acid leaching time, and is continuously increased along with the time, so that the graphite purity is slightly improved.
The graphite after primary acid leaching and purification is subjected to thermal activation treatment, so that the activity of residual impurities in the graphite can be effectively improved. Compared with a sample without activation treatment, the purity of the graphite is obviously improved. The main reason is that some clay minerals can be dehydrated and decomposed to form amorphous SiO in the temperature range of 700-800 DEG C2And Al2O3This is the main source of increased activity. From the thermodynamic analysis, after the impurity minerals are subjected to activation treatment and placed in the air for high-speed cooling, the ordered state of the lattice structure is destroyed, which is more obvious in the surface expression of the impurity crystal grains, so that the activation energy required by the reaction and the difficulty of further purification are obviously reduced. Experiments show that the consumption of hydrofluoric acid in the process of purifying graphite by a hydrofluoric acid method is 3.15 times of the theoretical consumption, the consumption can be reduced by two thirds by adding a thermal activation treatment process, the consumption is slightly lower than the theoretical consumption, and meanwhile, the fixed carbon content of the graphite can be increased from 99.74% to 99.98%, so that the thermal activation treatment obviously improves the activity of impurities, wherein the part with the higher activity can even directly react with sulfuric acid, thereby reducing the consumption of the hydrofluoric acid.
(2) And taking the treated graphite out, quickly cooling, and soaking in a mixed acid solution with hydrofluoric acid concentration of 1-4% and sulfuric acid concentration of 20-30%, wherein the acid leaching temperature is 70-75 ℃, and the acid leaching time is 2-4 h.
Similar to the rule of primary acid leaching, the purity of graphite is continuously improved along with the increase of the concentration of hydrofluoric acid obtained by secondary acid leaching, and reaches 99.98% at the position of 2%, and then is basically unchanged. When the purification is carried out by using the sulfuric acid alone, the purity of the graphite is lower and is only 99.84%. And a small amount of hydrofluoric acid is added, so that the purity of the graphite is obviously improved. Although thermal annealing increases the activity of impurities in the graphite, the activity must be fully manifested in the presence of hydrofluoric acid.
And soaking the secondary acid leaching solution for 2-4 h, wherein when the secondary acid leaching time is less than 2h, the graphite purity is continuously improved along with the increase of time and reaches 99.99% in about 2h, and then the graphite purity is not obviously changed. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and drying the graphite in a drying oven to obtain the high-purity graphite with the fixed carbon content of more than 99.99 percent.
The invention has the beneficial effects that: compared with a hydrofluoric acid method, the concentration and the dosage of hydrofluoric acid are obviously reduced by adding a thermal activation process; compared with other graphite purification methods, the method has the advantages of simple operation, short time consumption, low energy consumption and low production cost, and can effectively remove impurities in the graphite, so that the fixed carbon content of the purified graphite reaches more than 99.99 percent.
Detailed Description
The present invention is explained in further detail below with reference to specific examples, but it should be understood that the scope of the present invention is not limited to the specific examples. The concentration of hydrofluoric acid or sulfuric acid in the following examples refers to the mass fraction of the acid in the mixed acid.
Example 1
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of hydrofluoric acid with the concentration of 10% and sulfuric acid with the concentration of 30%, wherein the acid leaching temperature is 70 ℃, the acid leaching time is 2 hours, and then performing thermal activation treatment on the graphite, wherein the thermal activation temperature is 700 ℃, and the activation time is 60 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 2% and sulfuric acid concentration of 20%, wherein the acid leaching temperature is 70 ℃, and the acid leaching time is 2 hours. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After purification by the method, the fixed carbon content in the graphite is detected to be 99.992% according to the method in patent 201110056199.6.
Example 2
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of hydrofluoric acid with the concentration of 10% and sulfuric acid with the concentration of 50%, wherein the acid leaching temperature is 70 ℃, the acid leaching time is 2 hours, and then performing thermal activation treatment on the graphite, wherein the thermal activation temperature is 700 ℃, and the activation time is 60 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 2% and sulfuric acid concentration of 20%, wherein the acid leaching temperature is 70 ℃, and the acid leaching time is 2 hours. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After purification by the method, the fixed carbon content in the graphite is detected to be 99.992% according to the method in patent 201110056199.6.
Example 3
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of 8% hydrofluoric acid and 40% sulfuric acid at the acid leaching temperature of 70 ℃ for 2 hours, and performing thermal activation treatment at the thermal activation temperature of 700 ℃ for 60 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 2% and sulfuric acid concentration of 20%, wherein the acid leaching temperature is 70 ℃, and the acid leaching time is 2 hours. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After purification by the method, the fixed carbon content in the graphite is detected to be 99.992% according to the method in patent 201110056199.6.
Example 4
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of hydrofluoric acid with the concentration of 5% and sulfuric acid with the concentration of 30%, wherein the acid leaching temperature is 75 ℃, the acid leaching time is 4 hours, and then performing thermal activation treatment on the graphite, wherein the thermal activation temperature is 700 ℃, and the activation time is 60 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 2% and sulfuric acid concentration of 20%, wherein the acid leaching temperature is 70 ℃, and the acid leaching time is 2 hours. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After the purification by the method, the content of the fixed carbon in the graphite is detected to be 99.993% according to the method in patent 201110056199.6.
Example 5
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of hydrofluoric acid with the concentration of 5% and sulfuric acid with the concentration of 30%, wherein the acid leaching temperature is 75 ℃, the acid leaching time is 3 hours, and then performing thermal activation treatment on the graphite, wherein the thermal activation temperature is 700 ℃, and the activation time is 80 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 2% and sulfuric acid concentration of 20%, wherein the acid leaching temperature is 70 ℃, and the acid leaching time is 2 hours. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After the purification by the method, the content of the fixed carbon in the graphite is detected to be 99.993% according to the method in patent 201110056199.6.
Example 6
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of hydrofluoric acid with the concentration of 5% and sulfuric acid with the concentration of 30%, wherein the acid leaching temperature is 70 ℃, the acid leaching time is 2 hours, and then performing thermal activation treatment on the graphite, wherein the thermal activation temperature is 800 ℃, and the activation time is 90 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 2% and sulfuric acid concentration of 20%, wherein the acid leaching temperature is 70 ℃, and the acid leaching time is 2 hours. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After purification by the above method, the fixed carbon content in graphite is 99.995% according to the method in patent 201110056199.6.
Example 7
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of hydrofluoric acid with the concentration of 5% and sulfuric acid with the concentration of 30%, wherein the acid leaching temperature is 70 ℃, the acid leaching time is 2 hours, and then performing thermal activation treatment on the graphite, wherein the thermal activation temperature is 700 ℃, and the activation time is 60 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 4% and sulfuric acid concentration of 30%, wherein the acid leaching temperature is 70 ℃, and the acid leaching time is 2 h. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After the purification by the method, the content of the fixed carbon in the graphite is detected to be 99.993% according to the method in patent 201110056199.6.
Example 8
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of hydrofluoric acid with the concentration of 5% and sulfuric acid with the concentration of 30%, wherein the acid leaching temperature is 70 ℃, the acid leaching time is 2 hours, and then performing thermal activation treatment on the graphite, wherein the thermal activation temperature is 700 ℃, and the activation time is 60 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 2% and sulfuric acid concentration of 20%, wherein the acid leaching temperature is 75 ℃, and the acid leaching time is 4 hours. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After the purification by the method, the content of the fixed carbon in the graphite is detected to be 99.994% according to the method in patent 201110056199.6.
Example 9
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of hydrofluoric acid with the concentration of 5% and sulfuric acid with the concentration of 30%, wherein the acid leaching temperature is 70 ℃, the acid leaching time is 2 hours, and then performing thermal activation treatment on the graphite, wherein the thermal activation temperature is 700 ℃, and the activation time is 60 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 3% and sulfuric acid concentration of 25%, wherein the acid leaching temperature is 75 ℃, and the acid leaching time is 4 hours. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After the purification by the method, the content of the fixed carbon in the graphite is detected to be 99.993% according to the method in patent 201110056199.6.
Example 10
Grinding and crushing natural graphite serving as a raw material, soaking the graphite in a mixed acid solution of hydrofluoric acid with the concentration of 5% and sulfuric acid with the concentration of 30%, wherein the acid leaching temperature is 70 ℃, the acid leaching time is 2 hours, and then performing thermal activation treatment on the graphite, wherein the thermal activation temperature is 700 ℃, and the activation time is 60 minutes; and taking the treated graphite out, quickly cooling, and soaking the sample in a mixed acid solution with hydrofluoric acid concentration of 2% and sulfuric acid concentration of 30%, wherein the acid leaching temperature is 70 ℃, and the acid leaching time is 2 hours. And finally, filtering graphite from the acid leaching solution, washing the graphite with high-purity water until the pH value is about 6.5-7.0, and then placing the graphite in a drying box for drying. After the purification by the method, the content of the fixed carbon in the graphite is detected to be 99.996% according to the method in the patent 201110056199.6.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the content of the embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the technical scope of the present invention, and any changes and modifications made are within the protective scope of the present invention.
Claims (6)
1. A method for preparing high-purity graphite by combining secondary acid leaching with thermal activation is characterized by comprising the following steps: comprises the following steps
S01, grinding and crushing graphite;
s02 primary acid leaching: dipping graphite in mixed acid formed by hydrofluoric acid and sulfuric acid;
s03 heat activation treatment: filtering graphite from the mixed acid, and performing thermal activation treatment;
s04 secondary acid leaching: after the thermal activation treatment is finished, cooling, and performing secondary acid leaching on the graphite, wherein the secondary acid leaching solution is mixed acid of hydrofluoric acid and sulfuric acid;
s05, filtering graphite from the acid leaching solution, washing and drying to obtain the graphite;
the thermal activation treatment comprises the following specific steps: putting graphite into a high-purity graphite crucible with a cover, placing the crucible into a box type high-temperature resistance furnace, and carrying out thermal activation treatment on the crucible, wherein the thermal activation temperature is 700-800 ℃, and the activation time is 55-65 min.
2. The method for preparing high-purity graphite by combining secondary acid leaching and thermal activation according to claim 1, wherein the method comprises the following steps: the concentration of hydrofluoric acid and the concentration of sulfuric acid in the mixed acid subjected to primary acid leaching in the step S02 are respectively 5-10% and 30-50%.
3. The process for preparing high purity graphite by secondary acid leaching combined with thermal activation according to claim 1 or 2, wherein: the primary acid leaching temperature is 70-75 ℃, and the acid leaching time is 2-4 h.
4. The method for preparing high-purity graphite by combining secondary acid leaching and thermal activation according to claim 1, wherein the method comprises the following steps: the concentration of hydrofluoric acid in the mixed acid of the secondary acid leaching solution is 1% -4%, and the concentration of sulfuric acid is 20% -30%.
5. The method for preparing high-purity graphite by combining secondary acid leaching and thermal activation according to claim 1 or 4, wherein: the secondary acid leaching temperature is 70-75 ℃, and the acid leaching time is 2-4 h.
6. The method for preparing high-purity graphite by combining secondary acid leaching and thermal activation according to claim 1, wherein the method comprises the following steps: the step S05 specifically includes: and filtering graphite from the acid leaching solution, washing with high-purity water until the pH value is 6.5-7.0, and drying in a drying oven.
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