CN110092375B - Processing method of expandable graphite without wastewater and waste residue discharge - Google Patents
Processing method of expandable graphite without wastewater and waste residue discharge Download PDFInfo
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- CN110092375B CN110092375B CN201910500550.2A CN201910500550A CN110092375B CN 110092375 B CN110092375 B CN 110092375B CN 201910500550 A CN201910500550 A CN 201910500550A CN 110092375 B CN110092375 B CN 110092375B
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- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
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Abstract
The invention discloses a processing method of expandable graphite without wastewater and waste residue discharge, which comprises the following steps of (1) uniformly stirring graphite powder, concentrated sulfuric acid and an oxidant to prepare a graphite mixed material; (2) placing the graphite mixed material into a flotation tank, adding fresh water into the flotation tank to perform primary washing flotation, scraping the floated primary foam material into a foam collecting tank, adding fresh water into the foam collecting tank to perform secondary jet flotation and float out secondary foam material, performing vacuum filtration and drying on the secondary foam material to obtain a finished product of expandable graphite, and returning the waste water obtained after the secondary jet flotation into the flotation tank for recycling; (3) and (3) repeatedly adding the graphite mixture into the wastewater obtained after the primary washing and flotation so as to recycle the wastewater, pouring the wastewater into an acid tank for filtration and separation when the concentration of acid in the wastewater reaches 60-70%, recycling the obtained solid impurities, and adding apatite powder into the waste acid solution separated from the acid tank for reaction to prepare the fertilizer. The invention has no waste water and waste residue discharge in the process of processing the expandable graphite, thereby being environment-friendly.
Description
Technical Field
The invention belongs to the technical field of preparation of expandable graphite, and particularly relates to a processing method of expandable graphite without wastewater and waste residue discharge.
Background
In the prior art, the process method for processing the expandable graphite comprises the following steps: the graphite mixed raw materials are stirred and then placed in a washing tank, water is added for 6-8 times for repeated washing, vacuum filtration is carried out, then the filtered expandable graphite semi-finished product material is dried or directly aired at normal temperature, and finally the expandable graphite semi-finished product material is bagged. The process has the problems of large amount of waste water discharge and waste residue treatment.
In the prior art, as a good treatment method for waste water and waste residues is not available, most enterprises producing and processing graphite are often reined in production due to environmental protection failure, because sulfuric acid, nitric acid and sodium dichromate added into graphite are precipitated and pickled in a washing step in the production process of processing expandable graphite, the water consumption is large, 7-8 cubic water is needed for producing one ton of expandable graphite, a large amount of waste water is discharged in the production process, and the waste water contains a large amount of sulfuric acid, chromium sulfate, sodium sulfate and other components, so that the environment is seriously polluted after the waste water is discharged, and meanwhile, the harm is caused to people and plants. In addition, the waste slag generated in the processing process is usually treated by lime, but the treated waste slag can not be reused, so that the method has no practical value.
Disclosure of Invention
The invention provides a processing method of expandable graphite without wastewater and waste residue discharge, and no wastewater and waste residue discharge is generated in the process of processing expandable graphite, so that the processing method is environment-friendly.
In order to solve the technical problem, the invention adopts the following technical scheme:
a processing method of expandable graphite without wastewater and waste residue discharge comprises the following steps:
(1) weighing 1 part of flake graphite powder, 1.3-1.5 parts of concentrated sulfuric acid with the content of 90-98% and 0.08-0.12 part of oxidant according to the weight part ratio, and putting the weighed flake graphite powder, concentrated sulfuric acid and oxidant into a stirrer to be uniformly stirred so as to prepare a graphite mixture;
(2) putting the graphite mixed material in the step (1) into a flotation tank, and according to the graphite mixed material in the flotation tank: adding fresh water in a volume ratio of 1:5-6, performing primary washing flotation on the graphite mixture in a mode of continuously adding fresh water by mechanical stirring, scraping primary foam generated after the primary washing flotation into a foam collecting pool by a scraper, and then adding the foam into the foam collecting pool according to the following steps: adding fresh water according to the volume ratio of 1:4-5 to perform secondary jet flotation on the primary foam through a jet flotation device, floating out secondary foam materials, taking out precipitates in a foam collecting tank after the secondary jet flotation, drying the precipitates, recycling the precipitates, and returning the wastewater in the foam collecting tank after the secondary jet flotation to the flotation tank for continuous recycling;
(3) repeating the addition of the graphite mixed material to the wastewater generated after the primary washing and flotation in the step (2) to recycle the wastewater generated after the primary washing and flotation, wherein the volume ratio of the wastewater generated after the primary washing and flotation to the added graphite mixed material is 1:5-6, simultaneously detecting the recycled wastewater in real time, and pouring the wastewater into an acid tank for filtering and separating treatment when the concentration of acid in the wastewater reaches 60-70%;
(4) vacuum filtering the secondary foam material floated in the step (2), and filtering to obtain an expandable graphite semi-finished product;
(5) drying the expandable graphite semi-finished product in the step (4), drying to obtain an expandable graphite finished product, and then bagging and warehousing the expandable graphite finished product;
(6) and (3) cleaning and airing the solid impurity materials obtained by filtering and separating in the acid tank in the step (3) for recycling, taking out the waste acid liquor separated in the acid tank, adding the apatite powder for reaction, stirring the waste acid liquor and the added apatite powder into paste, and then stacking, curing and airing to obtain the inorganic fertilizer.
Further, in the step (1), the oxidant is any one of potassium permanganate, sodium dichromate, potassium dichromate, sodium perchlorate, potassium perchlorate and hydrogen peroxide.
Further, the air conditioner is provided with a fan,
in the step (1), potassium permanganate is used as an oxidant;
in the step (6), the solid impurity material obtained by filtering and separating in the acid tank in the step (3) is solid manganese oxide, and the solid manganese oxide is cleaned and dried to be used as a chemical material for recycling.
Further, the air conditioner is provided with a fan,
in the step (1), sodium dichromate or potassium dichromate is used as an oxidant;
in the step (3), pouring the wastewater into an acid tank to perform electrolytic chromium reduction, and then performing filtration separation treatment on the wastewater subjected to electrolytic chromium reduction;
in the step (6), the solid impurity material obtained by filtering and separating in the acid tank in the step (3) is solid chromium sesquioxide, and the solid chromium sesquioxide is cleaned and dried to be used as a chemical material for recycling.
Further, in the step (2), the precipitate in the foam collecting tank after the secondary jet flow flotation is dried and then is used as a chemical material for recycling.
Further, in the step (3), the recycled wastewater is detected in real time by using a permethrin gravimeter so as to detect the concentration of acid in the wastewater in real time.
Further, in the step (4), the secondary foam material floated in the step (2) is placed into a plate-and-frame filter press for vacuum filtration.
Further, in the step (5), the expandable graphite semi-finished product in the step (4) is placed into a dryer for drying, wherein the drying temperature is 60-80 ℃, and the drying time is 15-20 minutes.
Further, in the step (6), the solid impurity materials obtained by filtering and separating in the acid tank in the step (3) are washed and dried and then are recycled as chemical materials.
Further, in the step (6), the weight ratio of the waste acid solution to the apatite powder is 1.5: 1.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, the waste water generated after the primary washing and flotation in the step (2) is repeatedly added with the graphite mixed material to recycle the waste water generated after the primary washing and flotation, and the waste water in the foam collecting tank after the secondary jet flow flotation is returned to the flotation tank for continuous recycling in the step (2), so that the zero discharge of the waste water in the washing and flotation step can be realized, the environment is protected, and the washing process is simplified, 7-8 times of repeated washing are needed in the prior art, only 2 times of washing are needed in the invention, the water consumption for producing 1 ton of expandable graphite in the prior art is 7-8 square water, the water consumption for producing 1 ton of expandable graphite in the invention is 1-1.5 square water, and the expansion rate of the prepared expandable graphite can be improved by 3 percent;
in the invention, in the step (6), the waste acid liquor separated from the acid tank in the step (3) is taken out and added with the apatite powder for reaction, the waste acid liquor and the added apatite powder are stirred into paste, and then the paste is accumulated, cured and aired to prepare the inorganic fertilizer, and the prepared inorganic fertilizer is used as an agricultural fertilizer, so that no waste acid liquor is discharged, and the waste acid liquor is effectively recycled;
in the invention, in the step (2), the precipitate in the foam collecting tank after the secondary jet flow flotation is taken out and dried for recycling, and in the step (6), the solid impurity material obtained by filtering and separating treatment in the acid tank in the step (3) is cleaned, dried and recycled, so that waste residues in the processing and production process of the expandable graphite can be recycled, and no waste residues are discharged, thereby being environment-friendly.
Detailed Description
First, an embodiment
Example 1
A processing method of expandable graphite without wastewater and waste residue discharge comprises the following steps:
(1) weighing 1 part of flake graphite powder, 1.3 parts of concentrated sulfuric acid with the content of 90% and 0.08 part of potassium permanganate according to the weight part ratio, and putting the weighed flake graphite powder, concentrated sulfuric acid and potassium permanganate into a stirrer to be uniformly stirred so as to prepare a graphite mixed material;
(2) putting the graphite mixed material in the step (1) into a flotation tank, and according to the graphite mixed material in the flotation tank: adding fresh water in a volume ratio of 1:5, performing primary washing flotation on the graphite mixture in a mode of continuously adding fresh water by mechanical stirring, scraping primary foam generated after the primary washing flotation into a foam collecting pool by a scraper, and then adding the primary foam into the foam collecting pool according to the following steps: adding fresh water according to the volume ratio of 1:4 to perform secondary jet flotation on the primary foam through a jet flotation device, floating to obtain secondary foam, taking out and drying precipitates in the foam collecting tank after the secondary jet flotation, recycling the precipitates as chemical materials, and returning the wastewater in the foam collecting tank after the secondary jet flotation to the flotation tank for continuous recycling;
(3) repeatedly adding graphite mixed materials into the wastewater generated after the primary washing and flotation in the step (2) to recycle the wastewater generated after the primary washing and flotation, wherein the volume ratio of the wastewater generated after the primary washing and flotation to the added graphite mixed materials is 1:5, carrying out real-time detection on the recycled wastewater by using a Vermei hydrometer to detect the concentration of acid in the wastewater in real time, and pouring the wastewater into an acid tank to carry out filtration and separation treatment when the concentration of the acid in the wastewater reaches 60%;
(4) placing the secondary foam material floated in the step (2) into a plate-and-frame filter press for vacuum filtration, and filtering to obtain an expandable graphite semi-finished product;
(5) putting the expandable graphite semi-finished product in the step (4) into a dryer for drying at the drying temperature of 60 ℃ for 20 minutes to obtain an expandable graphite finished product, and then bagging the expandable graphite finished product for storage;
(6) and (3) filtering and separating in an acid tank to obtain solid impurity material which is solid manganese oxide, cleaning and drying the solid manganese oxide to be used as a chemical material for recycling, taking out the waste acid liquor separated from the acid tank, adding apatite powder for reaction, wherein the weight ratio of the waste acid liquor to the apatite powder is 1.5:1, stirring the waste acid liquor and the added apatite powder into paste, and then stacking, curing and airing to obtain the inorganic fertilizer.
Example 2
A processing method of expandable graphite without wastewater and waste residue discharge comprises the following steps:
(1) weighing 1 part of flake graphite powder, 1.4 parts of concentrated sulfuric acid with the content of 94% and 0.1 part of potassium permanganate according to the weight part ratio, and putting the weighed flake graphite powder, concentrated sulfuric acid and potassium permanganate into a stirrer to be uniformly stirred so as to prepare a graphite mixed material;
(2) putting the graphite mixed material obtained in the step (1) into a flotation tank, and according to the graphite mixed material: adding fresh water according to the volume ratio of 1:5.5, carrying out primary washing flotation on the graphite mixture in a mode of continuously adding fresh water by mechanical stirring, scraping primary foam generated after the primary washing flotation into a foam collecting pool by a scraper, and then adding the following raw materials into the foam collecting pool according to primary foam: adding fresh water according to the volume ratio of 1:4.5 to perform secondary jet flotation on the primary foam through a jet flotation device, floating out secondary foam materials, taking out precipitates in a foam collecting tank after the secondary jet flotation, drying the precipitates, recycling the precipitates as chemical materials, and returning the wastewater in the foam collecting tank after the secondary jet flotation to the flotation tank for continuous recycling;
(3) repeating the addition of graphite mixed materials to the wastewater generated after the primary washing and flotation in the step (2) to recycle the wastewater generated after the primary washing and flotation, wherein the volume ratio of the wastewater generated after the primary washing and flotation to the added graphite mixed materials is 1:5.5, carrying out real-time detection on the recycled wastewater by using a Vermei specific gravity meter to detect the concentration of acid in the wastewater in real time, and pouring the wastewater into an acid tank to carry out filtration and separation treatment when the concentration of the acid in the wastewater reaches 65%;
(4) putting the secondary foam material floated in the step (2) into a plate-and-frame filter press for vacuum filtration to obtain an expandable graphite semi-finished product after filtration;
(5) putting the expandable graphite semi-finished product in the step (4) into a dryer for drying at the drying temperature of 70 ℃ for 18 minutes to obtain an expandable graphite finished product, and then bagging the expandable graphite finished product for storage;
(6) and (3) filtering and separating in an acid tank to obtain solid impurity material which is solid manganese oxide, cleaning and drying the solid manganese oxide to be used as a chemical material for recycling, taking out the waste acid liquor separated from the acid tank, adding apatite powder for reaction, wherein the weight ratio of the waste acid liquor to the apatite powder is 1.5:1, stirring the waste acid liquor and the added apatite powder into paste, and then stacking, curing and airing to obtain the inorganic fertilizer.
Example 3
A processing method of expandable graphite without wastewater and waste residue discharge comprises the following steps:
(1) weighing 1 part of flake graphite powder, 1.5 parts of concentrated sulfuric acid with the content of 98% and 0.12 part of potassium permanganate according to the weight part ratio, and putting the weighed flake graphite powder, concentrated sulfuric acid and potassium permanganate into a stirrer to be uniformly stirred so as to prepare a graphite mixed material;
(2) putting the graphite mixed material obtained in the step (1) into a flotation tank, and according to the graphite mixed material: adding fresh water into the graphite mixture in a volume ratio of 1:6, performing primary washing flotation on the graphite mixture in a mode of continuously adding fresh water by mechanical stirring, scraping primary foam generated after the primary washing flotation into a foam collecting tank by a scraper, and then adding the following materials into the foam collecting tank according to primary foam: adding fresh water according to the volume ratio of 1:5 to perform secondary jet flotation on the primary foam through a jet flotation device, floating out secondary foam materials, taking out and drying precipitates in a foam collecting tank after the secondary jet flotation, recycling the precipitates as chemical materials, and returning the wastewater in the foam collecting tank after the secondary jet flotation to the flotation tank for continuous recycling;
(3) repeatedly adding graphite mixed materials into the wastewater generated after the primary washing and flotation in the step (2) to recycle the wastewater generated after the primary washing and flotation, wherein the volume ratio of the wastewater generated after the primary washing and flotation to the added graphite mixed materials is 1:6, carrying out real-time detection on the recycled wastewater by using a Vermei specific gravity meter to detect the concentration of acid in the wastewater in real time, and pouring the wastewater into an acid tank to carry out filtration and separation treatment when the concentration of the acid in the wastewater reaches 70%;
(4) putting the secondary foam material floated in the step (2) into a plate-and-frame filter press for vacuum filtration to obtain an expandable graphite semi-finished product after filtration;
(5) placing the expandable graphite semi-finished product in the step (4) into a dryer for drying at the drying temperature of 80 ℃ for 15 minutes to obtain an expandable graphite finished product, and then bagging and warehousing the expandable graphite finished product;
(6) and (3) filtering and separating in an acid tank to obtain solid impurity material which is solid manganese oxide, cleaning and drying the solid manganese oxide to be used as a chemical material for recycling, taking out the waste acid liquor separated from the acid tank, adding apatite powder for reaction, wherein the weight ratio of the waste acid liquor to the apatite powder is 1.5:1, stirring the waste acid liquor and the added apatite powder into paste, and then stacking, curing and airing to obtain the inorganic fertilizer.
Example 4
A processing method of expandable graphite without wastewater and waste residue discharge comprises the following steps:
(1) weighing 1 part of flake graphite powder, 1.4 parts of concentrated sulfuric acid with the content of 96% and 0.11 part of sodium dichromate or potassium dichromate according to the weight part ratio, and putting the weighed flake graphite powder, concentrated sulfuric acid and sodium dichromate or potassium dichromate into a stirrer to be uniformly stirred so as to prepare a graphite mixed material;
(2) putting the graphite mixed material in the step (1) into a flotation tank, and according to the graphite mixed material in the flotation tank: adding fresh water according to the volume ratio of 1:5.7, carrying out primary washing flotation on the graphite mixture in a mode of continuously adding fresh water by mechanical stirring, scraping primary foam generated after the primary washing flotation into a foam collecting pool by a scraper, and then adding the following raw materials into the foam collecting pool according to primary foam: adding fresh water according to the volume ratio of 1:4.8 to perform secondary jet flotation on the primary foam through a jet flotation device, floating out secondary foam materials, taking out precipitates in a foam collecting tank after the secondary jet flotation, drying the precipitates, recycling the precipitates as chemical materials, and returning the wastewater in the foam collecting tank after the secondary jet flotation to the flotation tank for continuous recycling;
(3) repeatedly adding graphite mixed materials into the wastewater generated after the primary washing and flotation in the step (2) to recycle the wastewater generated after the primary washing and flotation, wherein the volume ratio of the wastewater generated after the primary washing and flotation to the added graphite mixed materials is 1:5.7, carrying out real-time detection on the recycled wastewater by using a Vermei hydrometer to detect the concentration of acid in the wastewater in real time, pouring the wastewater into an acid tank to carry out electrolytic chromium reduction when the concentration of the acid in the wastewater reaches 68%, and then carrying out filtering separation treatment on the wastewater subjected to electrolytic chromium reduction;
(4) putting the secondary foam material floated in the step (2) into a plate-and-frame filter press for vacuum filtration to obtain an expandable graphite semi-finished product after filtration;
(5) putting the expandable graphite semi-finished product in the step (4) into a dryer for drying at the drying temperature of 75 ℃ for 17 minutes to obtain an expandable graphite finished product, and then bagging the expandable graphite finished product for storage;
(6) and (3) filtering and separating the solid impurity material obtained in the acid tank in the step (3) to obtain solid chromium sesquioxide, cleaning and drying the solid chromium sesquioxide, recycling the solid chromium sesquioxide as a chemical material, taking out the waste acid solution separated from the acid tank, adding apatite powder to react, wherein the weight ratio of the waste acid solution to the apatite powder is 1.5:1, stirring the waste acid solution and the added apatite powder into paste, and then stacking, curing and airing to obtain the inorganic fertilizer.
Second, reaction mechanism
Because the natural crystalline flake graphite of different deposits has different crystal structures, the oxidant adopted in the production of the expandable graphite is different, and when the oxidant is potassium permanganate, the following chemical reaction occurs in the step (1), 2KMnO 4 +2H 2 SO 4 ＝K 2 SO 4 +MnO 2 ↓+MnSO 4 +2H 2 O+2O 2 ↑, producing O 2 The scale graphite is oxidized, the Van der Waals force between the layers of the scale graphite is weakened, the distance between the layers of the scale graphite is increased, and then H is added 2 SO 4 The substances enter the flake graphite interlayer to form a graphite interlayer compound;
floating the prepared graphite mixture material to obtain a graphite foam material after flotation, wherein the composition in the wastewater obtained after flotation is H 2 SO 4 、K 2 SO 4 、MnSO 4 、H 2 O and suspended MnO 2 The waste water is treated by static precipitation or filtration separation to obtain solid MnO 2 Removal of solid MnO 2 The waste acid liquor left after the reaction and the apatite powder have the following chemical reaction, Ca 5 (PO 4 ) 3 (F，Cl，OH)+H 2 SO 4 →CaSO 4 +H 3 PO 4 The apatite selected in the invention is F-free apatite, so no HF gas is generated in the reaction process, but the apatite mineral also contains (Ca/Mg) CO 3 With Fe 2 O 3 Etc., and thus also the following reaction, (Ca/Mg) CO 3 +H 2 SO 4 ＝(Ca/Mg)SO 4 +CO 2 ↑+H 2 O，Fe 2 O 3 +3H 2 SO 4 ＝Fe 2 (SO 4 ) 3 +3H 2 O，Fe 2 O 3 +2H 3 PO 4 ＝2FePO 4 +3H 2 O。
Claims (10)
1. A processing method of expandable graphite without wastewater and waste residue discharge is characterized by comprising the following steps:
(1) weighing 1 part of flake graphite powder, 1.3-1.5 parts of concentrated sulfuric acid with the content of 90-98% and 0.08-0.12 part of oxidant according to the weight part ratio, and putting the weighed flake graphite powder, concentrated sulfuric acid and oxidant into a stirrer to be uniformly stirred so as to prepare a graphite mixture;
(2) putting the graphite mixed material in the step (1) into a flotation tank, and according to the graphite mixed material in the flotation tank: adding fresh water according to the volume ratio of water =1:5-6, carrying out primary washing flotation on the graphite mixture in a mode of continuously adding fresh water by mechanical stirring, scraping primary foam generated after the primary washing flotation into a foam collecting tank by a scraper, and then adding the following foam into the foam collecting tank according to the ratio of primary foam: adding fresh water according to the volume ratio of water =1:4-5 to perform secondary jet flotation on the primary foam through a jet flotation device, floating out secondary foam materials, taking out and drying precipitates in a foam collecting pool after the secondary jet flotation, recycling the precipitates, and returning waste water in the foam collecting pool after the secondary jet flotation to the flotation pool for continuous recycling;
(3) repeating the addition of the graphite mixed material to the wastewater generated after the primary washing and flotation in the step (2) to recycle the wastewater generated after the primary washing and flotation, wherein the volume ratio of the wastewater generated after the primary washing and flotation to the added graphite mixed material is 1:5-6, simultaneously detecting the recycled wastewater in real time, and pouring the wastewater into an acid tank for filtering and separating treatment when the concentration of acid in the wastewater reaches 60-70%;
(4) vacuum filtering the secondary foam material floated in the step (2), and filtering to obtain an expandable graphite semi-finished product;
(5) drying the expandable graphite semi-finished product in the step (4), drying to obtain an expandable graphite finished product, and then bagging the expandable graphite finished product for storage;
(6) and (4) cleaning, airing and recycling solid impurity materials obtained by filtering and separating in the acid tank in the step (3), taking out the waste acid liquor separated from the acid tank, adding the apatite powder for reaction, stirring the waste acid liquor and the added apatite powder into paste, and then stacking, curing and airing to obtain the inorganic fertilizer.
2. The method for processing expandable graphite without wastewater and waste residue discharge according to claim 1, wherein in the step (1), the oxidant is any one of potassium permanganate, sodium dichromate, potassium dichromate, sodium perchlorate, potassium perchlorate and hydrogen peroxide.
3. The expandable graphite processing method without waste water and slag discharge of claim 2,
in the step (1), potassium permanganate is used as an oxidant;
in the step (6), the solid impurity material obtained by filtering and separating in the acid tank in the step (3) is solid manganese oxide, and the solid manganese oxide is cleaned and dried to be used as a chemical material for recycling.
4. The expandable graphite processing method without waste water and slag discharge of claim 2,
in the step (1), sodium dichromate or potassium dichromate is used as an oxidant;
pouring the wastewater into an acid tank to perform electrolytic chromium reduction, and then performing filtration separation treatment on the wastewater subjected to electrolytic chromium reduction;
in the step (6), the solid impurity material obtained by filtering and separating in the acid tank in the step (3) is solid chromium sesquioxide, and the solid chromium sesquioxide is cleaned and dried to be used as a chemical material for recycling.
5. The method for processing expandable graphite without waste water and residue discharge according to claim 1, wherein in the step (2), the precipitate in the froth collection tank after the secondary jet flotation is dried and then used as chemical material for recycling.
6. The method for processing expandable graphite without wastewater and waste residue discharge according to claim 1, wherein in the step (3), the recycled wastewater is detected in real time by using a permafrost hydrometer so as to detect the concentration of acid in the wastewater in real time.
7. The method for processing expandable graphite without wastewater and waste residue discharge according to claim 1, wherein in the step (4), the secondary foam floated in the step (2) is put into a plate-and-frame filter press for vacuum filtration.
8. The method for processing expandable graphite without wastewater and waste residue discharge according to claim 1, wherein in the step (5), the expandable graphite semi-finished product in the step (4) is placed into a dryer for drying, the drying temperature is 60-80 ℃, and the drying time is 15-20 minutes.
9. The method for processing expandable graphite without wastewater and waste residue discharge according to claim 1, wherein in the step (6), the solid impurity material obtained by filtering and separating in the acid tank in the step (3) is cleaned and dried and then is recycled as a chemical material.
10. The method for processing expandable graphite without wastewater and waste residue discharge according to claim 1, wherein in the step (6), the weight ratio of the waste acid solution to the apatite powder is 1.5: 1.
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| CN103395810A (en) * | 2013-08-07 | 2013-11-20 | *** | Process for preparation of industrial aluminum sulfate by use of waste acid solution produced during production of expandable graphite |
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| CN105347339A (en) * | 2015-12-11 | 2016-02-24 | 中国科学院兰州化学物理研究所 | Preparation method of expanded graphite |
| CN106564895A (en) * | 2016-11-14 | 2017-04-19 | 滨州英特石化配件有限公司 | Preparation technology and system of expandable graphite |
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