CN113023728A - Preparation method of PNP carbon - Google Patents
Preparation method of PNP carbon Download PDFInfo
- Publication number
- CN113023728A CN113023728A CN202110356236.9A CN202110356236A CN113023728A CN 113023728 A CN113023728 A CN 113023728A CN 202110356236 A CN202110356236 A CN 202110356236A CN 113023728 A CN113023728 A CN 113023728A
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- Prior art keywords
- water
- activated carbon
- carbon
- pnp
- raw material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000011010 flushing procedure Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- 238000005406 washing Methods 0.000 claims abstract description 13
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract 4
- 239000002994 raw material Substances 0.000 claims description 32
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 12
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 9
- 229910052740 iodine Inorganic materials 0.000 claims description 9
- 239000011630 iodine Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 239000008399 tap water Substances 0.000 claims description 6
- 235000020679 tap water Nutrition 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 3
- 238000005273 aeration Methods 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 abstract description 16
- 238000011001 backwashing Methods 0.000 abstract description 9
- 238000004140 cleaning Methods 0.000 abstract description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 229960004424 carbon dioxide Drugs 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
Classifications
-
- 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
- C01B32/30—Active carbon
- C01B32/354—After-treatment
- C01B32/378—Purification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention relates to a water purifying substance, in particular to a preparation method of PNP carbon. The invention provides a preparation method of PNP carbon, aiming at solving the problems that the activated carbon needs 5-8 days for use in the initial period, about fifteen times of back washing is needed to adjust the pH value, and a large amount of powdered carbon black water is generated. The preparation method of the PNP carbon comprises the following steps: 1) preparing a flushing liquid; 2) putting the activated carbon into a filter material mesh bag and putting the activated carbon into a washing tank; 3) washing and soaking; 4) controlling water; 5) repeatedly cleaning; 6) drying; 7) and detecting whether the product is qualified. The prepared PNP carbon not only keeps the adsorption performance of the activated carbon, but also reduces the washing times during initial use and reduces the generation amount of the powdered carbon black water, thereby solving the problems of excessive discharge amount of the powdered carbon black water and ecological environment pollution, and simultaneously helping a water plant to quickly adjust the pH value to the range of water in the initial use of the activated carbon product.
Description
Technical Field
The invention relates to a water purification material, in particular to a preparation method of PNP carbon.
Background
In recent years, the demand for water quality has been increasing due to the improvement of living standard of people. In order to meet the high requirements of residents on water quality, most water works adopt water purification materials to deeply purify raw water of the water works. At present, activated carbon is widely applied to the field of water purification due to high adsorptivity, but a part of powdered activated carbon is attached to the surface of an activated carbon product in collision friction during delivery and long-distance transportation, so that about fifteen times of back washing is required to be carried out on the activated carbon when the activated carbon product is put into use in the initial stage of a water plant, a large amount of powdered carbon black water is generated during washing, and the generated powdered carbon black water has certain influence on the surrounding water ecology if being directly discharged; meanwhile, the pH value of raw water used by the current domestic water works is generally about 9, which is required in the national standard of China, sanitary Standard for Drinking Water GB5749-2006, the pH value of cities and towns is between 6.5 and 8.5, and the pH value of rural areas is between 6.5 and 9.5, and at the initial stage of putting the activated carbon, the pH value can be gradually controlled within the range of water yielding by matching with backwashing within 5 to 8 days due to the physical characteristics of the raw materials, so that the time consumption of the water works in the process of using the activated carbon at the initial stage is too long.
Disclosure of Invention
The invention provides a preparation method of PNP carbon, aiming at solving the problems that the activated carbon needs about fifteen times of backwashing within 5-8 days when put into use in the initial stage and generates a large amount of powdered carbon black water, so that the PNP carbon only needs about eight times of backwashing when put into use in the initial stage, and simultaneously, a large amount of powdered carbon black water generated in the backwashing is reduced.
The invention is realized by adopting the following technical scheme: the preparation method of the PNP carbon comprises the following steps:
1) proportioning tap water and industrial hydrochloric acid according to a volume ratio of 19:1, adding the mixture into a flushing tank, fully stirring the tap water and the industrial hydrochloric acid to uniformly mix the mixture, and airing the mixture for 30min-3h to form flushing liquid;
2) filling the water-purifying activated carbon raw material into a filter material mesh bag (a filter material mesh bag, namely a reticular bag for filtering materials) and soaking the filter material mesh bag filled with the activated carbon raw material into flushing fluid to ensure that the activated carbon raw material is completely submerged by the flushing fluid;
3) the stirring and washing tank (manual stirring or propeller-assisted liquid flow or other aeration devices can be adopted) is used for fully washing and soaking the active carbon raw material in the filter material mesh bag;
4) the filter material mesh bag is lifted to be separated from the liquid level of the flushing liquid, so that water control is carried out on the filter material mesh bag filled with the active carbon raw material (the water control aims at avoiding an air film and enabling the active carbon raw material in the filter material mesh bag to be flushed uniformly);
5) soaking the filter material mesh bag filled with the activated carbon raw material after water control into a washing tank again, and repeating the step 3) and the step 4 for 1-10 times);
6) taking out the activated carbon raw material which is repeatedly washed, soaked and water-controlled from the filter material mesh bag, and drying and airing the activated carbon raw material;
7) detecting the iodine adsorption value, the moisture content, the ash content, the PH value and the water-soluble index of the activated carbon raw material dried in the step 6), if the iodine adsorption value is more than or equal to 950 mg/g, the moisture content is less than or equal to 50%, the ash content is less than or equal to 14%, the PH value is 7-9 and the water-soluble index is less than or equal to 0.2%, the activated carbon raw material dried in the step 6) is PNP carbon, and if the iodine adsorption value is not less than 950 mg/g, the moisture content is less than or equal to 50%, the ash content is less than or equal to 14%, the PH value is 7-9 and the water-soluble index is less than or equal to 0.2%, returning to.
PNP charcoal is put into the use in the initial stage of water works, only need carry out the back flush of about eight times can make the pH value of raw water reach the effluent standard, though also have powdered carbon black water, the powdered carbon black water yield that produces when comparing the active carbon initial stage and using significantly reduces, can ignore almost, has reached the degree that can normally discharge.
The moisture, PH, and water solubility of the PNP carbon were all changed compared to the activated carbon. As shown in table 1, the moisture content of the activated carbon is less than or equal to 5%, and the moisture content of the PNP carbon is less than or equal to 50%, because the weak acid rinse liquid in the preparation method of the PNP carbon adheres to the PNP carbon in the form of moisture, when the PNP carbon is put into use at an initial stage, and the raw water is used for backwashing the PNP carbon, the weak acid solution of the PNP carbon and the carbon dioxide in the raw water undergo a neutralization reaction, so that the PH value of the raw water is rapidly reduced; the water-soluble matter of the active carbon is less than or equal to 0.4 percent, the water-soluble matter contains nearly 50 percent of water-soluble ash, and the water-soluble ash can react with carbon dioxide in raw water with higher PH value, so that the PH value of the raw water is improved, while the water-soluble matter of the PNP carbon prepared by the preparation method is less than or equal to 0.2 percent, most of the water-soluble ash is removed, and the PH value of the raw water can be effectively reduced; the PH value of the active carbon is 6-10, and the PH value of the PNP carbon is 7-9, so that when the PNP carbon is put into a water works at the initial stage for use, the PH value of the raw water can be quickly adjusted to the effluent standard; meanwhile, the adsorption performance of the PNP carbon is basically unchanged compared with that of the activated carbon.
The beneficial effects produced by the invention are as follows: the prepared PNP carbon not only maintains the adsorption performance of the activated carbon, but also reduces the backwashing times when the PNP carbon is put into use at the initial stage of a water plant, reduces the generation amount of the powdered carbon black water, solves the problems that the discharge amount of the powdered carbon black water is too much and the ecological environment is influenced, and simultaneously helps the water plant to more rapidly adjust the pH value of raw water to the range of water which can be discharged. According to the relevant national environmental protection regulations, illegal discharge of carbon black-containing activated carbon cleaning solution to natural water systems of rivers, lakes, warehouses and the like is strictly prohibited, and meanwhile, relevant sewage treatment facilities are not configured in the construction specifications of conventional municipal water plants, so that various contradictions are easily solved when the product is just published.
Detailed Description
The preparation method of the PNP carbon comprises the following steps:
1) proportioning tap water and industrial hydrochloric acid according to a volume ratio of 19:1, adding the mixture into a rinsing pool, fully stirring the tap water and the industrial hydrochloric acid to uniformly mix the mixture, and airing the mixture for 30min-3h (for example, 30min,50min,1h, 1.5h, 2h, 2.6h and 3 h) to form a rinsing liquid;
2) filling the water-purifying activated carbon raw material into a filter material mesh bag, and soaking the filter material mesh bag filled with the activated carbon raw material into flushing fluid to ensure that the activated carbon raw material is completely submerged by the flushing fluid;
3) stirring the washing tank to fully wash and soak the active carbon raw material in the filter material mesh bag;
4) raising the filter material mesh bag to be separated from the liquid level of the flushing liquid, and controlling water in the filter material mesh bag filled with the active carbon raw material;
5) soaking the filter material mesh bag filled with the activated carbon raw material after water control into a washing tank again, and repeating the step 3) and the step 4 for 1-10 times);
6) drying and airing the activated carbon raw material which is repeatedly washed, soaked and controlled in water;
7) detecting the iodine adsorption value, the moisture content, the ash content, the PH value and the water-soluble index of the activated carbon raw material dried in the step 6), if the iodine adsorption value is more than or equal to 950 mg/g, the moisture content is less than or equal to 50%, the ash content is less than or equal to 14%, the PH value is 7-9 and the water-soluble index is less than or equal to 0.2%, the activated carbon raw material dried in the step 6) is PNP carbon, and if the iodine adsorption value is not less than 950 mg/g, the moisture content is less than or equal to 50%, the ash content is less than or equal to 14%, the PH value is 7-9 and the water-soluble index is less than or equal to 0.2%, returning to.
When the PNP carbon is used in the initial stage, the PH value of raw water can reach the effluent standard only by performing about eight times of backwashing, and although powdered carbon black water exists, the water volume of the powdered carbon black produced in the initial stage of the PNP carbon is greatly reduced compared with that of the activated carbon, and the water volume can be almost ignored and reaches the normal discharge degree.
The moisture, PH, and water solubility of the PNP carbon were all changed compared to the activated carbon. As shown in table 1, the moisture content of the activated carbon is less than or equal to 5%, and the moisture content of the PNP carbon is less than or equal to 50%, because the washing liquid in the preparation method of the PNP carbon is weakly acidic, the washing liquid will be attached to the PNP carbon in the form of moisture, when the PNP carbon is put into use for the first time, and when the PNP carbon is washed by using raw water, the weak acid of the PNP carbon and carbon dioxide in the raw water undergo a neutralization reaction, so that the PH value in the raw water is reduced; the water-soluble matter of the activated carbon is less than or equal to 0.4 percent, the water-soluble matter contains nearly 50 percent of water-soluble ash, and the water-soluble ash can react with carbon dioxide in raw water, so that a large amount of powdered carbon black water is generated during the initial use of the activated carbon, and the pH value of the raw water can be improved, while the water-soluble matter of the PNP carbon prepared by the preparation method is less than or equal to 0.2 percent, most of the water-soluble ash is removed, the powdered carbon black water is reduced, and the pH value of the raw water is also reduced; the PH value of the active carbon is 6-10, and the PH value of the PNP carbon is 7-9, so that when the PNP carbon is used in a water plant at the initial stage, the PH value of raw water can be quickly adjusted to the effluent standard; meanwhile, the adsorption performance of the PNP carbon is basically unchanged compared with that of the activated carbon.
TABLE 1
In the specific implementation, in the step 3), the air explosion time of the flushing tank is 10min-2h (for example, 10min,25min,30min,50 min,1h,1.6h,1.9h and 2 h).
In the specific embodiment, in the step 3), the water control time of the filter material mesh bag filled with the activated carbon raw material is not more than 1 hour (for example, 2min,20min,30min,50min,1 h). The concentration of the industrial hydrochloric acid is 30-36%.
Claims (4)
- A preparation method of PNP carbon is characterized by comprising the following steps:1) proportioning tap water and industrial hydrochloric acid according to a volume ratio of 19:1, adding the mixture into a flushing tank, fully stirring the tap water and the industrial hydrochloric acid to uniformly mix the mixture, and airing the mixture for 30min-3h to form flushing liquid;2) filling the water-purifying activated carbon raw material into a filter material mesh bag, and soaking the filter material mesh bag filled with the activated carbon raw material into flushing fluid to ensure that the activated carbon raw material is completely submerged by the flushing fluid;3) stirring the washing tank to fully wash and soak the active carbon raw material in the filter material mesh bag;4) raising the filter material mesh bag to be separated from the liquid level of the flushing liquid, and controlling water in the filter material mesh bag filled with the active carbon raw material;5) soaking the filter material mesh bag filled with the activated carbon raw material after water control into a washing tank again, and repeating the step 3) and the step 4 for 1-10 times);6) drying and airing the activated carbon raw material which is repeatedly washed, soaked and controlled in water;7) detecting the indexes of iodine adsorption value, moisture, ash content, PH value and water-soluble substance of the activated carbon raw material dried in the step 6), if the iodine adsorption value is more than or equal to 950 mg/g, the moisture is less than or equal to 50, the ash content is less than or equal to 14, the PH value is 7-9, and the water-soluble substance is less than or equal to 0.2%, the activated carbon raw material dried in the step 6) is PNP carbon, and if the iodine adsorption value is not less than 950 mg/g, the moisture is less than or equal to 50, the ash content is less than or equal to 14, the PH value is 7-9, and the water-soluble substance is less than or equal to 0.2%, returning to the step 3.
- 2. The method for preparing PNP carbon according to claim 1, wherein in step 3), the time for aeration in the rinsing tank is 10min-2 h.
- 3. The method for preparing PNP carbon according to claim 2, wherein in the step 3), the water control time of the filter material mesh bag filled with the activated carbon raw material is not more than 1 hour.
- 4. The method according to claim 3, wherein the concentration of the concentrated hydrochloric acid is 30% to 36%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110356236.9A CN113023728A (en) | 2021-04-01 | 2021-04-01 | Preparation method of PNP carbon |
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| CN202110356236.9A CN113023728A (en) | 2021-04-01 | 2021-04-01 | Preparation method of PNP carbon |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 030006 floor 14, 15, block B, 84 Jinyang street, Xiaodian District, Taiyuan City, Shanxi Province (settled in Shanxi Kaizhuo Business Service Co., Ltd.) b-0116 Applicant after: Shanxi Xinhua Activated Carbon Industry Co.,Ltd. Address before: 030006 floor 14, 15, block B, 84 Jinyang street, Xiaodian District, Taiyuan City, Shanxi Province (settled in Shanxi Kaizhuo Business Service Co., Ltd.) b-0116 Applicant before: Shanxi Xinhua Activated Carbon Co.,Ltd. |
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