CN112479473A - Steel rolling wastewater treatment method - Google Patents
Steel rolling wastewater treatment method Download PDFInfo
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- CN112479473A CN112479473A CN202011434690.3A CN202011434690A CN112479473A CN 112479473 A CN112479473 A CN 112479473A CN 202011434690 A CN202011434690 A CN 202011434690A CN 112479473 A CN112479473 A CN 112479473A
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- treatment method
- steel rolling
- wastewater treatment
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 29
- 239000010959 steel Substances 0.000 title claims abstract description 29
- 238000005096 rolling process Methods 0.000 title claims abstract description 24
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 24
- 239000002351 wastewater Substances 0.000 claims abstract description 102
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 230000002378 acidificating effect Effects 0.000 claims abstract description 17
- 230000015556 catabolic process Effects 0.000 claims abstract description 16
- 238000006731 degradation reaction Methods 0.000 claims abstract description 16
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 13
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 13
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 13
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 13
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000000701 coagulant Substances 0.000 claims abstract description 7
- 230000003311 flocculating effect Effects 0.000 claims abstract description 7
- 238000007885 magnetic separation Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 239000003513 alkali Substances 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 12
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 229940037003 alum Drugs 0.000 claims description 12
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 12
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 12
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 12
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 claims description 9
- 238000005188 flotation Methods 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 230000000593 degrading effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a steel rolling wastewater treatment method, which comprises the following steps: (1) mixing acidic wastewater and alkaline wastewater in a neutralization tank, adding slaked lime to adjust the pH value to be alkaline, and obtaining weak-alkaline wastewater; (2) adding a degradation liquid into the weak alkali wastewater to obtain degraded wastewater; (3) adding a coagulant into the degraded wastewater, stirring and flocculating to obtain flocculated wastewater; (4) and adding magnetic seeds into the flocculated wastewater, and performing magnetic separation by using a magnetic disc to separate mud from water. The steel rolling wastewater treatment method can reduce the waste of water resources, reduce the environmental pollution and meet the water quality standard required by the production of steel enterprises.
Description
Technical Field
The invention relates to the field of industrial wastewater treatment, in particular to a steel rolling wastewater treatment method.
Background
In the production process of the cold-rolled stainless steel, a large amount of waste water is generated by the working procedures of annealing, pickling, cold rolling, coping, polishing, flattening, cutting and the like, and comprises the following steps: acid waste water discharged from the pickling line; the wastewater containing salt and metal ions is discharged after the activation treatment or the passivation of the steel surface; in the process of rolling the strip steel, in order to eliminate the thermal deformation generated by cold rolling, emulsion is adopted for cooling and lubricating, and cold rolling emulsion waste water is generated; before the uncoiling and annealing of the cooling strip steel, alkaline solution is used for degreasing, so that alkaline oily wastewater is generated, and if the alkaline oily wastewater is directly discharged, the environment is greatly polluted.
The currently adopted wastewater treatment process is to perform lime neutralization treatment on acid-containing wastewater and oil-containing wastewater together, and slaked lime is added to adjust the pH, but the water has high oil content, high COD (chemical oxygen demand) and large water quality change amplitude, the treatment is difficult to control, the quality of treated effluent is unstable, and water resource waste is easily caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a steel rolling wastewater treatment method which can reduce water resource waste, reduce environmental pollution and meet the water quality standard required by steel enterprise production.
In order to realize the aim, the invention provides a steel rolling wastewater treatment method, which comprises the following steps:
(1) mixing acidic wastewater and alkaline wastewater in a neutralization tank, adding slaked lime to adjust the pH value to be alkaline, and obtaining weak-alkaline wastewater;
(2) adding a degradation liquid into the weak alkali wastewater to obtain degraded wastewater;
(3) adding a coagulant into the degraded wastewater, stirring and flocculating to obtain flocculated wastewater;
(4) and adding magnetic seeds into the flocculated wastewater, and performing magnetic separation by using a magnetic disc to separate mud from water.
Preferably, the step (1) further comprises the step of adding sodium sulfhydrate into the acidic wastewater before adding the acidic wastewater into the neutralization pond and mixing, wherein the adding amount of the sodium sulfhydrate is 5-8% of the mass of the wastewater.
Preferably, the pH value of the wastewater is adjusted to 7.5-8.5 by adding slaked lime in the step (1).
Preferably, the degradation liquid in the step (2) comprises the following components in parts by weight: 10-15 parts of diatomite, 8-12 parts of ammonium humate, 5-8 parts of alum, 5-8 parts of ferric chloride and 5-8 parts of montmorillonite.
Preferably, the degradation liquid in the step (2) comprises the following components in parts by weight: 12 parts of diatomite, 10 parts of ammonium humate, 6 parts of alum, 6 parts of ferric chloride and 6 parts of montmorillonite.
Preferably, the degradation liquid in the step (2) is 12 parts of diatomite, 10 parts of ammonium humate, 6 parts of alum, 6 parts of ferric chloride and 6 parts of montmorillonite in parts by weight.
Preferably, the coagulant in the step (3) is polyacrylamide.
More preferably, the adding amount of the polyacrylamide is 5-8% of the mass of the degraded wastewater.
Preferably, the step (3) further comprises performing air flotation treatment after obtaining the flocculated wastewater.
Preferably, in the step (4), the adding amount of the magnetic seeds is 2-3% of the mass of the flocculated wastewater.
The invention has the beneficial effects that:
the method for treating the steel rolling wastewater comprises the steps of neutralizing the acidic wastewater and the alkaline wastewater, adding slaked lime to adjust the pH value, precipitating metal ions in the wastewater, adding a degradation liquid to effectively decolor and remove SS, COD and heavy metals, adding a flocculating agent to gather fine colloidal particles and micro suspended particles in a water body to form larger particles, facilitating the precipitation and floating process, and finally separating mud and water by using a magnetic disk separation technology, fully utilizing the energy of a high-energy physical magnetic field, having lower energy consumption and higher efficiency.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
The invention provides a steel rolling wastewater treatment method, which comprises the following steps:
(1) mixing acidic wastewater and alkaline wastewater in a neutralization tank, adding slaked lime to adjust the pH value to be alkaline, and obtaining weak-alkaline wastewater;
(2) adding a degradation liquid into the weak alkali wastewater to obtain degraded wastewater;
(3) adding a coagulant into the degraded wastewater, stirring and flocculating to obtain flocculated wastewater;
(4) adding magnetic seeds into the flocculated wastewater, and performing magnetic separation by using a magnetic disc to separate mud from water;
according to the invention, acidic wastewater and alkaline wastewater are neutralized, slaked lime is added to adjust pH, so that metal ions in the wastewater are precipitated, degradation liquid is added, the functions of effectively decoloring and removing SS, COD and heavy metals can be effectively achieved, a flocculating agent is added to aggregate fine colloidal particles and fine suspended particles in a water body to form larger particles, the precipitation and floating processes are facilitated, finally, a magnetic disk separation technology is used for separating mud from water, the energy of a high-energy physical magnetic field is fully utilized, and the method has the advantages of lower energy consumption and higher efficiency.
Preferably, in the step (1), sodium sulfhydrate is added into the acidic wastewater before the acidic wastewater is added into a neutralization pond and mixed, the adding amount of the sodium sulfhydrate is 5-8% of the mass of the wastewater, and the sodium sulfhydrate is added for the purpose of adding Cr into the acidic wastewater6+Reduction to Cr3+And environmental pollution is reduced.
Preferably, the pH value of the wastewater is adjusted to 7.5-8.5 by adding slaked lime in the step (1).
Preferably, the degradation liquid in the step (2) comprises the following components in parts by weight: 10-15 parts of diatomite, 8-12 parts of ammonium humate, 5-8 parts of alum, 5-8 parts of ferric chloride and 5-8 parts of montmorillonite.
Preferably, the degradation liquid in the step (2) comprises the following components in parts by weight: 12 parts of diatomite, 10 parts of ammonium humate, 6 parts of alum, 6 parts of ferric chloride and 6 parts of montmorillonite.
Preferably, the degradation liquid in the step (2) comprises 12 parts of diatomite, 10 parts of ammonium humate, 6 parts of alum, 6 parts of ferric chloride and 6 parts of montmorillonite in parts by weight.
Preferably, the coagulant in the step (3) is polyacrylamide, the addition amount of the polyacrylamide is 5-8% of the mass of the degraded wastewater, and the precipitation performance of the precipitated particles is improved.
Preferably, the step (3) further comprises the steps of performing air floatation treatment after the flocculated wastewater is obtained, using a highly dispersed micro air-gown as a carrier to adhere to suspended pollutants in the wastewater, enabling the buoyancy of the suspended pollutants to be larger than the gravity and the resistance, enabling the pollutants to float to the water surface to form foams, and scraping the foams from the water surface by using a slag scraping device to realize the process of solid-liquid or liquid-liquid separation.
Preferably, in the step (4), the adding amount of the magnetic seeds is 2-3% of the mass of the flocculated wastewater.
The above is a detailed description of the present invention, and the following is an example of the present invention, in which the parts by weight are in grams.
Example 1
A steel rolling wastewater treatment method comprises the following steps:
(1) mixing acidic wastewater and alkaline wastewater in a neutralization tank, adding slaked lime to adjust the pH value to 7.5, and obtaining weak alkaline wastewater;
(2) adding the following components in parts by weight into the weak base wastewater: degrading 10 parts of diatomite, 8 parts of ammonium humate, 5 parts of alum, 5 parts of ferric chloride and 5 parts of montmorillonite to obtain degraded wastewater;
(3) adding polyacrylamide into the degraded wastewater, stirring and flocculating, wherein the addition amount of the polyacrylamide is 5% of the mass of the degraded wastewater, and obtaining flocculated wastewater;
(4) adding magnetic seeds into the flocculated wastewater, wherein the adding amount of the magnetic seeds is 2% of the mass of the flocculated wastewater, and performing magnetic separation by using a magnetic disc to separate sludge from water.
Example 2
A steel rolling wastewater treatment method comprises the following steps:
(1) mixing acidic wastewater and alkaline wastewater in a neutralization tank, adding slaked lime to adjust the pH value to 8.5, and obtaining weak alkaline wastewater;
(2) adding the following components in parts by weight into the weak base wastewater: degrading 15 parts of diatomite, 12 parts of ammonium humate, 8 parts of alum, 8 parts of ferric chloride and 8 parts of montmorillonite to obtain degraded wastewater;
(3) adding polyacrylamide into the degraded wastewater, stirring and flocculating, wherein the addition amount of the polyacrylamide is 8% of the mass of the degraded wastewater, and obtaining flocculated wastewater;
(4) adding magnetic seeds into the flocculated wastewater, wherein the adding amount of the magnetic seeds is 3% of the mass of the flocculated wastewater, and performing magnetic separation by using a magnetic disc to separate sludge and water.
Example 3
A steel rolling wastewater treatment method comprises the following steps:
(1) adding sodium hydrosulfide into the acidic wastewater, mixing the acidic wastewater with the alkaline wastewater in a neutralization pond, wherein the adding amount of the sodium hydrosulfide is 5% of the mass of the wastewater, and adding slaked lime to adjust the pH value to 8 to obtain weak-alkaline wastewater;
(2) adding the following components in parts by weight into the weak base wastewater: degrading degradation liquid of 12 parts of diatomite, 10 parts of ammonium humate, 6 parts of alum, 6 parts of ferric chloride and 6 parts of montmorillonite to obtain degraded wastewater;
(3) adding polyacrylamide into the degraded wastewater, stirring and flocculating, wherein the addition amount of the polyacrylamide is 6% of the mass of the degraded wastewater, and performing air floatation treatment after obtaining flocculated wastewater;
(4) and adding magnetic seeds into the wastewater after the air floatation treatment, wherein the adding amount of the magnetic seeds is 2 percent of the mass of the wastewater after the air floatation treatment, and performing magnetic separation by using a magnetic disc to separate mud from water.
The water quality after the treatment of the invention can reach the following standard.
| Item | Index of water quality after treatment |
| pH | 7-9 |
| Suspended matter | ≤0.2mg/L |
| Oil-containing | 0mg/L |
| Total iron | ≤0.1mg/L |
| CODcr | ≤11 |
The steel rolling wastewater treatment method improves the treatment process efficiency, has complete sedimentation and separation, reduces the environmental pollution while reducing the water resource waste, and ensures that all indexes of the treated water quality reach the standard and meet the water quality standard required by the production of steel enterprises.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. A steel rolling wastewater treatment method is characterized by comprising the following steps:
(1) mixing acidic wastewater and alkaline wastewater in a neutralization tank, adding slaked lime to adjust the pH value to be alkaline, and obtaining weak-alkaline wastewater;
(2) adding a degradation liquid into the weak alkali wastewater to obtain degraded wastewater;
(3) adding a coagulant into the degraded wastewater, stirring and flocculating to obtain flocculated wastewater;
(4) and adding magnetic seeds into the flocculated wastewater, and performing magnetic separation by using a magnetic disc to separate mud from water.
2. The steel rolling wastewater treatment method according to claim 1, wherein the step (1) further comprises adding sodium sulfhydrate into the acidic wastewater before adding the acidic wastewater into the neutralization pond, wherein the addition amount of the sodium sulfhydrate is 5-8% of the mass of the wastewater.
3. The steel rolling wastewater treatment method according to claim 1, wherein slaked lime is added in the step (1) to adjust the pH value of the wastewater to 7.5-8.5.
4. The steel rolling wastewater treatment method according to claim 1, wherein the degradation liquid in the step (2) comprises, in parts by weight: 10-15 parts of diatomite, 8-12 parts of ammonium humate, 5-8 parts of alum, 5-8 parts of ferric chloride and 5-8 parts of montmorillonite.
5. The steel rolling wastewater treatment method according to claim 4, wherein the degradation liquid in the step (2) comprises, in parts by weight: 12 parts of diatomite, 10 parts of ammonium humate, 6 parts of alum, 6 parts of ferric chloride and 6 parts of montmorillonite.
6. The steel rolling wastewater treatment method according to claim 5, wherein the degradation liquid in the step (2) comprises 12 parts by weight of diatomite, 10 parts by weight of ammonium humate, 6 parts by weight of alum, 6 parts by weight of ferric chloride and 6 parts by weight of montmorillonite.
7. The steel rolling wastewater treatment method according to claim 1, wherein the coagulant in step (3) is polyacrylamide.
8. The steel rolling wastewater treatment method according to claim 7, wherein the amount of polyacrylamide added is 5-8% of the mass of the degraded wastewater.
9. The steel rolling wastewater treatment method according to claim 1, wherein the step (3) further comprises performing air flotation treatment after obtaining the flocculated wastewater.
10. The steel rolling wastewater treatment method according to claim 1, wherein in the step (4), the addition amount of the magnetic seeds is 2-3% of the mass of the flocculated wastewater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011434690.3A CN112479473A (en) | 2020-12-10 | 2020-12-10 | Steel rolling wastewater treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011434690.3A CN112479473A (en) | 2020-12-10 | 2020-12-10 | Steel rolling wastewater treatment method |
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| CN112479473A true CN112479473A (en) | 2021-03-12 |
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| CN202011434690.3A Pending CN112479473A (en) | 2020-12-10 | 2020-12-10 | Steel rolling wastewater treatment method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475272A (en) * | 2009-01-22 | 2009-07-08 | 武汉钢铁(集团)公司 | Pretreatment process for oily watewater of cold rolling mill |
| CN105254124A (en) * | 2015-10-16 | 2016-01-20 | 巢湖市聚源机械有限公司 | Steel rolling wastewater treating method |
-
2020
- 2020-12-10 CN CN202011434690.3A patent/CN112479473A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475272A (en) * | 2009-01-22 | 2009-07-08 | 武汉钢铁(集团)公司 | Pretreatment process for oily watewater of cold rolling mill |
| CN105254124A (en) * | 2015-10-16 | 2016-01-20 | 巢湖市聚源机械有限公司 | Steel rolling wastewater treating method |
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Application publication date: 20210312 |