CN113753885A - Chemical purification and wastewater treatment process for natural spherical graphite - Google Patents
Chemical purification and wastewater treatment process for natural spherical graphite Download PDFInfo
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- CN113753885A CN113753885A CN202111033033.2A CN202111033033A CN113753885A CN 113753885 A CN113753885 A CN 113753885A CN 202111033033 A CN202111033033 A CN 202111033033A CN 113753885 A CN113753885 A CN 113753885A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 53
- 239000010439 graphite Substances 0.000 title claims abstract description 53
- 238000000746 purification Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000126 substance Substances 0.000 title claims abstract description 17
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 14
- 239000002351 wastewater Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000003756 stirring Methods 0.000 claims abstract description 41
- 239000002253 acid Substances 0.000 claims abstract description 32
- 238000005406 washing Methods 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 230000007935 neutral effect Effects 0.000 claims abstract description 11
- 239000008394 flocculating agent Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000011084 recovery Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 31
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 22
- 239000000376 reactant Substances 0.000 claims description 20
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 16
- 229910017604 nitric acid Inorganic materials 0.000 claims description 16
- 239000012065 filter cake Substances 0.000 claims description 15
- 238000004062 sedimentation Methods 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 10
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 2
- 238000000108 ultra-filtration Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 2
- -1 hydrogen ions Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
- C01B32/215—Purification; Recovery or purification of graphite formed in iron making, e.g. kish graphite
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a chemical purification and wastewater treatment process for natural spherical graphite, which comprises the following steps: obtaining a primary mixed acid solution; adding natural spherical graphite and water into a reaction kettle, and continuously stirring until the natural spherical graphite and the water are completely mixed; heating the reaction kettle; sending to a filter pressing dehydrator for primary deacidification and washing to be neutral; obtaining a secondary mixed acid solution; washing to neutrality after secondary deacidification, dehydrating, and drying to obtain high-purity spherical graphite; the obtained wastewater is delivered to a wastewater treatment system for recovery treatment, the invention relates to the technical field of spherical graphite purification, the process flow is compact, the purification efficiency is high, the cost of the whole flow is low, the process is suitable for quantitative production, wastewater generated in the purification process can be neutralized and precipitated by ammonia water, then a flocculating agent is added, residual ions are further reacted and precipitated, the discharge standard is reached after filtration, the whole wastewater treatment speed is high, the treatment effect is good, and convenience is brought to the use of people.
Description
Technical Field
The invention relates to the technical field of graphite purification, in particular to a process for chemically purifying natural spherical graphite and treating wastewater.
Background
Graphite is a crystalline carbon. Hexagonal system, iron black to dark gray. Density 2.25 g/cm 3, hardness 1.5, melting point 3652 deg.c and boiling point 4827 deg.c. The natural spherical graphite is soft, has a greasy feeling and can conduct electricity, wherein the natural spherical graphite is subjected to spheroidization by mainly using a mechanical force method, and graphite particles are subjected to plastic deformation and particle adsorption through a series of acting forces such as collision, friction, shearing and the like generated by mechanical action to obtain a finished spherical graphite product.
The existing spherical graphite purification technology has poor purification efficiency and higher cost, and can generate a large amount of wastewater in the purification process, and the wastewater is directly discharged to pollute the environment, thereby bringing inconvenience to people.
Disclosure of Invention
The invention aims to provide a process for chemically purifying natural spherical graphite and treating wastewater, and mainly aims to solve the problems that the existing purification technology is high in cost and low in efficiency, and the generated wastewater pollutes the environment.
The technical scheme of the invention is that the chemical purification process of the natural spherical graphite comprises the following steps:
s1, fully stirring and mixing hydrofluoric acid, hydrochloric acid and nitric acid to obtain a primary mixed acid solution;
s2, adding natural spherical graphite and water into the reaction kettle, mixing and stirring to form slurry, adding the mixed acid solution prepared in the step S1, and continuously stirring until the natural spherical graphite and the water are completely mixed;
s3, heating the reaction kettle to 80-100 ℃, and reacting for 10-14 h to obtain a primary reactant;
s4, conveying the primary reactant to a filter-pressing dehydrator, performing primary deacidification, washing to be neutral, and performing filter pressing to obtain a filter cake, wherein the pH value of washing water is 7;
s5, taking silicofluoric acid and nitric acid, and fully stirring and mixing to obtain a secondary mixed acid solution;
s6, mixing the filter cake with water, adding a secondary mixed acid solution, fully stirring and mixing, heating to 80-100 ℃, and reacting for 6-8 hours to obtain a secondary reactant;
s7, conveying the secondary reactant to a filter-pressing dehydrator, performing secondary deacidification, washing to be neutral, adjusting the pH of washing water to 7, dehydrating, and drying to obtain high-purity spherical graphite;
and S8, performing primary deacidification, secondary deacidification and dehydration to obtain wastewater, and conveying the wastewater to a wastewater treatment system for recovery treatment.
Preferably, in the step S2, the mass ratio of the hydrofluoric acid, the hydrochloric acid, the nitric acid, the spherical graphite and the water is (15-25): (20-40): (10-15): 100: (80-120).
Preferably, the mass ratio of the filter cake to the water in the step S6 is 100: (50-80).
Preferably, the water in step S2 and step S6 is ultrafiltration water.
Preferably, the heating method in steps S3 and S6 is natural gas heating.
A chemical purification wastewater treatment process for natural spherical graphite is used for treating wastewater generated by the spherical graphite purification process, and comprises the following steps:
s1, conveying the wastewater to a sedimentation tank, introducing ammonia water with the concentration of 15 wt% -20 wt% into the sedimentation tank, measuring the pH value of the wastewater, stopping introducing the ammonia water when the pH value is more than 7, and standing for sedimentation;
s2, adding a flocculating agent into the wastewater subjected to precipitation in the step S1, reacting, and standing for precipitation;
s3, introducing the wastewater treated in the step S2 into a treatment tank, adding a water purification compound, mixing and stirring, and adjusting the pH value to 6-7;
and S4, passing the wastewater treated in the step S3 through a precision filter and an ultrafilter in sequence, and then reaching the discharge standard.
Preferably, the water purifying compound is aluminum trichloride.
Preferably, the stirring time of the step S3 is 30-50 min, and the stirring speed is 150 r/min.
The invention has the beneficial effects that: the method has the advantages of compact process flow, high purification efficiency, low cost of the whole process flow and suitability for quantitative production, can quickly dissolve impurities in the spherical graphite by mixing hydrofluoric acid, hydrochloric acid, silicofluoric acid, nitric acid and the like to form a mixed acid solution, can neutralize and precipitate the waste water generated in the purification process by ammonia water, then adds a flocculating agent to further react and precipitate residual ions, neutralizes redundant hydrogen ions or hydroxide ions in the waste water by aluminum trichloride, achieves the discharge standard after filtration, has higher treatment speed of the whole waste water, better treatment effect and brings convenience to people.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1: a chemical purification process of natural spherical graphite comprises the following steps:
s1, fully stirring and mixing hydrofluoric acid, hydrochloric acid and nitric acid to obtain a primary mixed acid solution;
s2, adding natural spherical graphite and water into a reaction kettle, mixing and stirring to form slurry, adding the mixed acid solution prepared in the step S1, and continuously stirring until the mixed acid solution is completely mixed, wherein the mass ratio of hydrofluoric acid, hydrochloric acid, nitric acid, spherical graphite to water is 15: 20: 10: 100: 80;
s3, heating the reaction kettle to 80 ℃, and reacting for 10 hours to obtain a primary reactant;
s4, conveying the primary reactant to a filter-pressing dehydrator, performing primary deacidification, washing to be neutral, and performing filter pressing to obtain a filter cake, wherein the pH value of washing water is 7;
s5, taking silicofluoric acid and nitric acid, and fully stirring and mixing to obtain a secondary mixed acid solution;
s6, mixing the filter cake with water, wherein the mass ratio of the filter cake to the water is 100: 50, adding the secondary mixed acid solution, fully stirring and mixing, heating to 80 ℃, and reacting for 6 hours to obtain a secondary reactant;
s7, conveying the secondary reactant to a filter-pressing dehydrator, performing secondary deacidification, washing to be neutral, adjusting the pH of washing water to 7, dehydrating, and drying to obtain high-purity spherical graphite;
and S8, performing primary deacidification, secondary deacidification and dehydration to obtain wastewater, and conveying the wastewater to a wastewater treatment system for recovery treatment.
A chemical purification wastewater treatment process for natural spherical graphite is used for treating wastewater generated by the spherical graphite purification process, and comprises the following steps:
s1, conveying the wastewater to a sedimentation tank, introducing ammonia water with the concentration of 15 wt% into the sedimentation tank, measuring the pH value of the wastewater, stopping introducing the ammonia water when the pH value is more than 7, and standing for sedimentation;
s2, adding a flocculating agent into the wastewater subjected to precipitation in the step S1, reacting, and standing for precipitation;
s3, introducing the wastewater treated in the step S2 into a treatment tank, adding a water purification compound, wherein the water purification compound is aluminum trichloride, mixing and stirring, adjusting the pH value to 6, stirring for 30min, and stirring at a speed of 150 r/min;
and S4, passing the wastewater treated in the step S3 through a precision filter and an ultrafilter in sequence, and then reaching the discharge standard.
Example 2: a chemical purification process of natural spherical graphite comprises the following steps:
s1, fully stirring and mixing hydrofluoric acid, hydrochloric acid and nitric acid to obtain a primary mixed acid solution;
s2, adding natural spherical graphite and water into a reaction kettle, mixing and stirring to form slurry, adding the mixed acid solution prepared in the step S1, and continuously stirring until the mixed acid solution is completely mixed, wherein the mass ratio of hydrofluoric acid, hydrochloric acid, nitric acid, spherical graphite to water is 20: 30: 13: 100: 100, respectively;
s3, heating the reaction kettle to 90 ℃, and reacting for 12h to obtain a primary reactant;
s4, conveying the primary reactant to a filter-pressing dehydrator, performing primary deacidification, washing to be neutral, and performing filter pressing to obtain a filter cake, wherein the pH value of washing water is 7;
s5, taking silicofluoric acid and nitric acid, and fully stirring and mixing to obtain a secondary mixed acid solution;
s6, mixing the filter cake with water, wherein the mass ratio of the filter cake to the water is 100: 70, adding the secondary mixed acid solution, fully stirring and mixing, heating to 90 ℃, and reacting for 7 hours to obtain a secondary reactant;
s7, conveying the secondary reactant to a filter-pressing dehydrator, performing secondary deacidification, washing to be neutral, adjusting the pH of washing water to 7, dehydrating, and drying to obtain high-purity spherical graphite;
and S8, performing primary deacidification, secondary deacidification and dehydration to obtain wastewater, and conveying the wastewater to a wastewater treatment system for recovery treatment.
A chemical purification wastewater treatment process for natural spherical graphite is used for treating wastewater generated by the spherical graphite purification process, and comprises the following steps:
s1, conveying the wastewater to a sedimentation tank, introducing ammonia water with the concentration of 18 wt% into the sedimentation tank, measuring the pH value of the wastewater, stopping introducing the ammonia water when the pH value is more than 7, and standing for sedimentation;
s2, adding a flocculating agent into the wastewater subjected to precipitation in the step S1, reacting, and standing for precipitation;
s3, introducing the wastewater treated in the step S2 into a treatment tank, adding a water purification compound, wherein the water purification compound is aluminum trichloride, mixing and stirring, adjusting the pH value to 7, and stirring for 40min at a stirring speed of 150 r/min;
and S4, passing the wastewater treated in the step S3 through a precision filter and an ultrafilter in sequence, and then reaching the discharge standard.
Example 3: a chemical purification process of natural spherical graphite comprises the following steps:
s1, fully stirring and mixing hydrofluoric acid, hydrochloric acid and nitric acid to obtain a primary mixed acid solution;
s2, adding natural spherical graphite and water into a reaction kettle, mixing and stirring to form slurry, adding the mixed acid solution prepared in the step S1, and continuously stirring until the mixed acid solution is completely mixed, wherein the mass ratio of hydrofluoric acid, hydrochloric acid, nitric acid, spherical graphite to water is 25: 40: 15: 100: 120 of a solvent;
s3, heating the reaction kettle to 100 ℃, and reacting for 14h to obtain a primary reactant;
s4, conveying the primary reactant to a filter-pressing dehydrator, performing primary deacidification, washing to be neutral, and performing filter pressing to obtain a filter cake, wherein the pH value of washing water is 7;
s5, taking silicofluoric acid and nitric acid, and fully stirring and mixing to obtain a secondary mixed acid solution;
s6, mixing the filter cake with water, wherein the mass ratio of the filter cake to the water is 100: 80, adding the secondary mixed acid solution, fully stirring and mixing, heating to 100 ℃, and reacting for 8 hours to obtain a secondary reactant;
s7, conveying the secondary reactant to a filter-pressing dehydrator, performing secondary deacidification, washing to be neutral, adjusting the pH of washing water to 7, dehydrating, and drying to obtain high-purity spherical graphite;
and S8, performing primary deacidification, secondary deacidification and dehydration to obtain wastewater, and conveying the wastewater to a wastewater treatment system for recovery treatment.
A chemical purification wastewater treatment process for natural spherical graphite is used for treating wastewater generated by the spherical graphite purification process, and comprises the following steps:
s1, conveying the wastewater to a sedimentation tank, introducing ammonia water with the concentration of 20 wt% into the sedimentation tank, measuring the pH value of the wastewater, stopping introducing the ammonia water when the pH value is more than 7, and standing for sedimentation;
s2, adding a flocculating agent into the wastewater subjected to precipitation in the step S1, reacting, and standing for precipitation;
s3, introducing the wastewater treated in the step S2 into a treatment tank, adding a water purification compound, wherein the water purification compound is aluminum trichloride, mixing and stirring, adjusting the pH value to 7, and stirring for 50min at a stirring speed of 150 r/min;
and S4, passing the wastewater treated in the step S3 through a precision filter and an ultrafilter in sequence, and then reaching the discharge standard.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. A chemical purification process of natural spherical graphite is characterized by comprising the following steps:
s1, fully stirring and mixing hydrofluoric acid, hydrochloric acid and nitric acid to obtain a primary mixed acid solution;
s2, adding natural spherical graphite and water into the reaction kettle, mixing and stirring to form slurry, adding the mixed acid solution prepared in the step S1, and continuously stirring until the natural spherical graphite and the water are completely mixed;
s3, heating the reaction kettle to 80-100 ℃, and reacting for 10-14 h to obtain a primary reactant;
s4, conveying the primary reactant to a filter-pressing dehydrator, performing primary deacidification, washing to be neutral, and performing filter pressing to obtain a filter cake, wherein the pH value of washing water is 7;
s5, taking silicofluoric acid and nitric acid, and fully stirring and mixing to obtain a secondary mixed acid solution;
s6, mixing the filter cake with water, adding a secondary mixed acid solution, fully stirring and mixing, heating to 80-100 ℃, and reacting for 6-8 hours to obtain a secondary reactant;
s7, conveying the secondary reactant to a filter-pressing dehydrator, performing secondary deacidification, washing to be neutral, adjusting the pH of washing water to 7, dehydrating, and drying to obtain high-purity spherical graphite;
and S8, performing primary deacidification, secondary deacidification and dehydration to obtain wastewater, and conveying the wastewater to a wastewater treatment system for recovery treatment.
2. The chemical purification process of natural spherical graphite according to claim 1, wherein the mass ratio of hydrofluoric acid, hydrochloric acid, nitric acid, spherical graphite and water in step S2 is (15-25): (20-40): (10-15): 100: (80-120).
3. The chemical purification process of natural spherical graphite according to claim 1, wherein the mass ratio of the filter cake to the water in step S6 is 100: (50-80).
4. The chemical purification process of natural spherical graphite according to claim 1, wherein the water in step S2 and step S6 is ultrafiltration water.
5. The chemical purification process of natural spherical graphite according to claim 1, wherein the heating manner in steps S3 and S6 is natural gas heating.
6. A process for treating wastewater generated in the purification process of natural spherical graphite according to any one of claims 1 to 5, which comprises the following steps:
s1, conveying the wastewater to a sedimentation tank, introducing ammonia water with the concentration of 15 wt% -20 wt% into the sedimentation tank, measuring the pH value of the wastewater, stopping introducing the ammonia water when the pH value is more than 7, and standing for sedimentation;
s2, adding a flocculating agent into the wastewater subjected to precipitation in the step S1, reacting, and standing for precipitation;
s3, introducing the wastewater treated in the step S2 into a treatment tank, adding a water purification compound, mixing and stirring, and adjusting the pH value to 6-7;
and S4, passing the wastewater treated in the step S3 through a precision filter and an ultrafilter in sequence, and then reaching the discharge standard.
7. The process of claim 6, wherein the water purifying compound is aluminum trichloride.
8. The process for treating wastewater from chemical purification of natural spherical graphite according to claim 6, wherein the stirring time of step S3 is 30-50 min, and the stirring speed is 150 r/min.
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| CN115611277A (en) * | 2022-10-24 | 2023-01-17 | 苏州中材非金属矿工业设计研究院有限公司 | Preparation process of high-purity graphite |
| CN115716645A (en) * | 2022-12-09 | 2023-02-28 | 武汉理工大学 | Purification method of spherical graphite mixed acid leaching-ultrasonic water washing |
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