CN113755852A - Treatment system and method for reducing acid consumption and reducing emission of red mud in steel acid pickling and rust removing process - Google Patents
Treatment system and method for reducing acid consumption and reducing emission of red mud in steel acid pickling and rust removing process Download PDFInfo
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- CN113755852A CN113755852A CN202111067157.2A CN202111067157A CN113755852A CN 113755852 A CN113755852 A CN 113755852A CN 202111067157 A CN202111067157 A CN 202111067157A CN 113755852 A CN113755852 A CN 113755852A
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- 239000002253 acid Substances 0.000 title claims abstract description 69
- 238000005554 pickling Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 46
- 239000010959 steel Substances 0.000 title claims abstract description 46
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000008399 tap water Substances 0.000 claims abstract description 18
- 235000020679 tap water Nutrition 0.000 claims abstract description 18
- 239000008237 rinsing water Substances 0.000 claims abstract description 15
- 238000002425 crystallisation Methods 0.000 claims abstract description 12
- 230000008025 crystallization Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 61
- 229940032330 sulfuric acid Drugs 0.000 description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 29
- 229910052742 iron Inorganic materials 0.000 description 27
- -1 iron ions Chemical class 0.000 description 25
- 238000005246 galvanizing Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229960004887 ferric hydroxide Drugs 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
- IPCXNCATNBAPKW-UHFFFAOYSA-N zinc;hydrate Chemical compound O.[Zn] IPCXNCATNBAPKW-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/36—Regeneration of waste pickling liquors
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
本发明属于钢材防腐蚀技术领域，涉及一种降低钢材酸洗除锈过程中酸耗和减排红泥的处理系统及方法，处理系统，包括酸洗槽、与所述酸洗槽连通的一级漂洗槽、与所述一级漂洗槽连通的二级漂洗槽和与所述二级漂洗槽连通的三级漂洗槽以及接收所述酸洗槽排出液体的低温结晶池和用于向所述酸洗槽提供酸液的配酸槽，所述一级漂洗槽连通所述配酸槽，所述三级漂洗槽通过回流管反向连通所述二级漂洗槽、所述二级漂洗槽通过回流管反向连通所述一级漂洗槽，且所述三级漂洗槽连通有自来水供应管。本发明与传统工艺不同的是新工艺中没有漂洗水处理系统，无酸碱中和反应，从根本上避免了红泥的产生，实现酸耗的大幅降低以及红泥的零排放。
The invention belongs to the technical field of anti-corrosion of steel, and relates to a processing system and method for reducing acid consumption and reducing red mud in the process of pickling and rust removal of steel. The processing system comprises a pickling tank and a A primary rinsing tank, a secondary rinsing tank communicating with the primary rinsing tank, a tertiary rinsing tank communicating with the secondary rinsing tank, and a low-temperature crystallization tank for receiving the liquid discharged from the pickling tank and for supplying the The pickling tank provides an acid distribution tank for acid solution, the first-level rinsing tank is connected to the acid distribution tank, the third-level rinse tank is reversely connected to the second-level rinse tank through a return pipe, and the second-level rinse tank is connected to the second-level rinse tank. The return pipe is reversely connected to the primary rinsing tank, and the tertiary rinsing tank is connected with a tap water supply pipe. The difference between the present invention and the traditional process is that there is no rinsing water treatment system and no acid-base neutralization reaction in the new process, which fundamentally avoids the generation of red mud, greatly reduces acid consumption and realizes zero discharge of red mud.
Description
Technical Field
The invention belongs to the technical field of steel corrosion prevention, and particularly relates to a treatment system and method for reducing acid consumption and reducing emission of red mud in a steel acid pickling and rust removing process.
Background
Steel has the advantages of high yield, good mechanical properties, low price and the like, so the steel is widely applied to industries such as machinery, buildings, household appliances and the like. However, ordinary steel is extremely easy to corrode in natural environment, the corrosion rate is higher in special environment occasions such as marine climate, high temperature and high humidity, and a large amount of steel is scrapped due to corrosion every year. The hot galvanizing can greatly slow down the corrosion of steel and prolong the service life of the steel, and has the advantages of low production cost, good mechanical property of a coating and the like, so the hot galvanizing is a common method for steel corrosion prevention. In the hot galvanizing production process, hydrochloric acid or sulfuric acid is generally adopted to chemically dissolve rust on the surface of a steel product, so that iron atoms in the steel product are exposed on the surface of the steel product, and necessary process conditions are created for subsequent hot galvanizing.
In the traditional sulfuric acid pickling process of hot galvanizing, in order to reduce the concentration of iron ions in rinsing water and reduce the amount of the iron ions brought into a plating assistant solution, the rinsing water is usually purified to generate a large amount of red mud (the main components are ferric hydroxide, zinc hydroxide and water).
The prior art pickling, spent acid treatment and rinse water treatment process is shown in figure 1. In the pickling process of the steel, pickling and rust removal are completed in a first-stage pickling tank, a second-stage pickling tank or a third-stage pickling tank, and a layer of sulfuric acid solution (mainly comprising water, sulfuric acid and ferrous sulfate) is adhered to the surface of the pickled steel. In the rinsing process, the pickled steel sequentially passes through a primary rinsing tank and a secondary rinsing tank, the sulfuric acid solution on the surface of the steel is washed into rinsing water, and the sulfuric acid and the iron ions in the secondary rinsing tank are low in concentration because the steel firstly passes through the primary rinsing tank and then passes through the secondary rinsing tank. However, as the rinsing process proceeds, the concentrations of sulfuric acid and iron ions in the secondary rinsing tank gradually increase, which leads to a decrease in pH and an increase in the concentration of iron ions in the subsequent processes, and finally causes an increase in the amount of zinc slag in the hot galvanizing process. Therefore, the rinse water in the secondary rinse tank must be subjected to online iron removal, the waste rinse water is continuously conveyed to the purification tank during the iron removal process, and meanwhile, alkali (generally sodium hydroxide) is added into the purification tank, so that the sulfuric acid is converted into sodium sulfate (causing high sulfuric acid consumption), and iron ions are converted into iron hydroxide (namely red mud). According to the regulations of the national records of dangerous wastes, red mud is a dangerous waste. According to the environmental prevention and control method of China: the enterprise and public institution should utilize the industrial solid waste produced by the enterprise and public institution according to economic and technical conditions; for those that are temporarily unused or unusable, it is necessary to construct storage facilities and sites according to the regulations of the administrative department of environmental protection of the state department, to store them in safe classification, or to take harmless measures. Because the main component of the red mud is ferric hydroxide and the zinc content is low, the disposal difficulty is high, and therefore, all hot galvanizing enterprises adopt a method of entrusting qualified third party disposal to treat the red mud, and the defects of high disposal cost and large environmental risk exist.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a treatment system for reducing acid consumption and reducing emission of red mud in the steel acid pickling and rust removing process and a treatment method based on the system.
The invention adopts the following technical scheme:
the utility model provides a reduce steel pickling rust cleaning in-process acid consumption and emission reduction red mud's processing system, including the descaling bath, with the one-level potcher of descaling bath intercommunication, with the second grade potcher of one-level potcher intercommunication and with the tertiary potcher of second grade potcher intercommunication and receipt the low temperature crystallization pond of descaling bath discharge liquid with be used for to the descaling bath provides the acid mixing groove of acidizing fluid, one-level potcher intercommunication the acid mixing groove, tertiary potcher passes through back flow reverse intercommunication the second grade potcher pass through back flow reverse intercommunication the one-level potcher, just tertiary potcher intercommunication has the running water supply pipe.
According to the scheme, the steel after acid washing is sequentially rinsed in the first-stage rinsing tank, the second-stage rinsing tank and the third-stage rinsing tank to realize three-stage rinsing, and the concentrations of sulfuric acid and iron ions are the largest in the first-stage rinsing tank, the concentrations of sulfuric acid and iron ions are the next lowest in the second-stage rinsing tank and the concentrations of sulfuric acid and iron ions are the lowest in the third-stage rinsing tank. In the acid preparation process, part of rinsing water in the primary rinsing tank is extracted, so that high-concentration sulfuric acid and iron ions in the primary rinsing tank are recycled. Meanwhile, part of the low-sulfuric-acid and iron-ion-concentration rinsing water in the secondary rinsing tank and tap water are respectively input into the primary rinsing tank (so that the concentration of sulfuric acid and iron ions in the rinsing water in the primary rinsing tank is reduced, and the rinsing capacity of the rinsing water is improved). Meanwhile, the rinse water in the third-level rinse tank is conveyed to the second-level rinse tank, tap water is conveyed to the third-level rinse tank, the concentration of sulfuric acid and iron ions of the rinse water in the second-level rinse tank and the concentration of the sulfuric acid and the iron ions of the rinse water in the third-level rinse tank are reduced, and the rinsing capacity of the rinse water is improved. Because a rinsing water treatment system in the traditional process is not provided, and acid-base neutralization reaction is not performed, the acid consumption can be greatly reduced, and the zero emission of red mud can be realized.
Preferably, the primary rinsing tank is communicated with a tap water supply pipe.
Preferably, the primary rinsing tank is communicated with the acid preparation tank through a first pump, a second pump is arranged on a tap water supply pipe communicated with the primary rinsing tank, and a third pump is arranged on a return pipe reversely communicated with the primary rinsing tank.
Preferably, the sum of the flow rates of the second and third pumps is equal to the flow rate of the first pump.
Preferably, the flow rate ratio of the second pump to the third pump is from 0:8 to 8: 0.
Preferably, a fourth pump is arranged on a return pipe of the three-stage rinsing tank which is reversely communicated with the two-stage rinsing tank, a fifth pump is arranged on a tap water supply pipe communicated with the three-stage rinsing tank, and the first pump, the second pump, the third pump, the fourth pump and the fifth pump are controlled by the same switch.
Preferably, the low-temperature crystallization tank is communicated with the acid preparation tank.
Preferably, the flow rates of the third pump, the fourth pump and the fifth pump are the same.
The processing method provided by the invention adopts the following technical scheme:
a treatment method for reducing acid consumption and reducing emission of red mud in a steel acid pickling and rust removing process comprises an acid pickling step of pickling steel, a three-stage rinsing step of rinsing the pickled steel, a low-temperature crystallization step of crystallizing discharged liquid in an acid pickling tank and an acid preparation step of preparing acid liquor for the acid pickling tank, wherein in the acid preparation step, a first pump is started to pump rinse water in part of a first-stage rinsing tank to the acid preparation tank, and a second pump, a third pump, a fourth pump and a fifth pump are started simultaneously.
Preferably, in the three-stage rinsing step, the time of each stage of rinsing is 1-15 min.
Preferably, the crystallization temperature of the low-temperature crystallization step is from-50 ℃ to 5 ℃.
Through the implementation of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
compared with the traditional process, the novel process has no rinsing water treatment system and no acid-base neutralization reaction, thereby fundamentally avoiding the generation of red mud, greatly reducing the acid consumption and realizing the zero emission of the red mud.
Drawings
FIG. 1 is a flow chart of a steel acid pickling rust removal system in the prior art;
FIG. 2 is a flow chart of the steel acid pickling rust removal system.
Detailed Description
For better understanding of the above technical solutions, the above technical solutions will be described in detail with reference to the drawings and specific examples, but the embodiments of the present invention are not limited thereto.
Example 1
The utility model provides a reduce processing system that steel pickling rust cleaning in-process acid consumed and reduce discharging red mud, as shown in figure 2, including the descaling bath, with the one-level potcher of descaling bath intercommunication, with the second grade potcher of one-level potcher intercommunication and with the tertiary potcher of second grade potcher intercommunication and receipt the low temperature crystallizer of descaling bath discharge liquid with be used for to the descaling bath provides the acid mixing groove of acidizing fluid, one-level potcher intercommunication have the running water supply pipe with the acid mixing groove installs first pump B1 on communicating pipe with the acid mixing groove intercommunication, installs second pump B2 on the running water supply pipe. The tertiary rinsing tank is reversely communicated with the secondary rinsing tank through a return pipe, and a fourth pump B4 is arranged on the return pipe. The second-stage rinsing tank is reversely communicated with the first-stage rinsing tank through a return pipe, a third pump B3 is installed on the return pipe, the third-stage rinsing tank is communicated with a tap water supply pipe, and a fifth pump B5 is arranged on the tap water supply pipe.
According to the scheme, the steel after acid washing is sequentially rinsed in the first-stage rinsing tank, the second-stage rinsing tank and the third-stage rinsing tank to realize three-stage rinsing, and the concentrations of sulfuric acid and iron ions are the largest in the first-stage rinsing tank, the concentrations of sulfuric acid and iron ions are the next lowest in the second-stage rinsing tank and the concentrations of sulfuric acid and iron ions are the lowest in the third-stage rinsing tank. In the acid preparation process, part of rinsing water in the primary rinsing tank is extracted, so that high-concentration sulfuric acid and iron ions in the primary rinsing tank are recycled. Meanwhile, part of the low-sulfuric-acid and iron-ion-concentration rinse water in the secondary rinse tank and tap water are respectively input into the primary rinse tank (so that the concentration of sulfuric acid and iron ions in the rinse water in the primary rinse tank is reduced and the rinsing capacity of the rinse water is improved), and in the process, the sum of the flow rates of the second pump B2 and the third pump B3 is kept equal to the flow rate of the first pump B1. Meanwhile, the rinse water in the third-stage rinse tank is conveyed to the second-stage rinse tank, tap water is conveyed to the third-stage rinse tank, the concentration of sulfuric acid and iron ions of the rinse water in the second-stage rinse tank and the concentration of the sulfuric acid and the iron ions of the rinse water in the third-stage rinse tank are reduced, the rinse capacity of the rinse water is improved, and in the process, the flow rates of the third pump B3, the fourth pump B4 and the fifth pump B5 are the same. The first pump B1, the second pump B2, the third pump B3, the fourth pump B4 and the fifth pump B5 are controlled by the same switch to be turned on and off simultaneously. Because a rinsing water treatment system in the traditional process is not provided, and acid-base neutralization reaction is not performed, the acid consumption can be greatly reduced, and the zero emission of red mud can be realized.
Example 2:
the utility model provides a reduce processing system of steel pickling rust cleaning in-process acid consumption and emission reduction red mud, as shown in figure 2, including the descaling bath, with the one-level potcher of descaling bath intercommunication, with the second grade potcher of one-level potcher intercommunication and with the tertiary potcher of second grade potcher intercommunication and receipt the low temperature crystallizer of descaling bath discharge liquid with be used for to the descaling bath provides the pickling bath of acidizing fluid, the descaling bath sets up threely, one-level potcher intercommunication have the running water supply pipe with the pickling bath installs first pump B1 on communicating pipe with the pickling bath intercommunication, installs second pump B2 on the running water supply pipe. The tertiary rinsing tank is reversely communicated with the secondary rinsing tank through a return pipe, and a fourth pump B4 is arranged on the return pipe. The second-stage rinsing tank is reversely communicated with the first-stage rinsing tank through a return pipe, a third pump B3 is installed on the return pipe, the third-stage rinsing tank is communicated with a tap water supply pipe, and a fifth pump B5 is arranged on the tap water supply pipe.
The treatment method for reducing acid consumption and reducing emission of red mud in the steel acid pickling and rust removing process based on the treatment system comprises an acid pickling step of pickling the steel, a three-stage rinsing step of rinsing the pickled steel, a low-temperature crystallization step of crystallizing the discharged liquid in the pickling tank and an acid preparation step of preparing acid liquor for the pickling tank. Firstly, the pickling is carried out in a three-stage pickling tank sequentially, the pickling time is 3-30 minutes, and the pickling is carried out for 15 minutes in the embodiment. And then, sequentially rinsing the pickled steel in a first-stage rinsing tank, a second-stage rinsing tank and a third-stage rinsing tank to realize three-stage rinsing, wherein the time of each stage of rinsing is 1-15min, the first-stage rinsing time is preferably longer than the second-stage rinsing time and longer than the third-stage rinsing time, and in the embodiment, the time is preferably 10 minutes, 6 minutes and 2 minutes sequentially. The sulfuric acid and iron ion concentrations are greatest in the primary rinse tank, next to the secondary rinse tank, and lowest in the tertiary rinse tank. In the acid preparation process, part of rinsing water in the primary rinsing tank is extracted, so that high-concentration sulfuric acid and iron ions in the primary rinsing tank are recycled. Meanwhile, part of the low-sulfuric-acid and iron-ion-concentration rinse water in the secondary rinse tank and tap water are respectively input into the primary rinse tank (so that the concentration of sulfuric acid and iron ions in the rinse water in the primary rinse tank is reduced and the rinsing capacity of the rinse water is improved), in the process, the sum of the flow rates of a second pump B2 and a third pump B3 is kept equal to the flow rate of a first pump B1, and the flow rate ratio of the second pump B2 to the third pump B3 is 0:8 to 8:0, and the embodiment is preferably 1: 3. Meanwhile, the rinse water in the third-stage rinse tank is conveyed to the second-stage rinse tank, tap water is conveyed to the third-stage rinse tank, the concentration of sulfuric acid and iron ions of the rinse water in the second-stage rinse tank and the concentration of the sulfuric acid and the iron ions of the rinse water in the third-stage rinse tank are reduced, the rinse capacity of the rinse water is improved, and in the process, the flow rates of the third pump B3, the fourth pump B4 and the fifth pump B5 are the same. The first pump B1, the second pump B2, the third pump B3, the fourth pump B4 and the fifth pump B5 are controlled by the same switch to be turned on and off simultaneously. Because a rinsing water treatment system in the traditional process is not provided, and acid-base neutralization reaction is not performed, the acid consumption can be greatly reduced, and the zero emission of red mud can be realized.
The waste acid after acid washing is treated by a low-temperature crystallization method to produce ferrous sulfate and mother liquor, wherein the crystallization temperature is minus 50 ℃ to 5 ℃, and the temperature is preferably zero to five ℃. The mother liquor enters an acid preparation tank and is prepared with the added sulfuric acid and the rinsing liquid of the primary rinsing tank.
Claims (10)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114369780A (en) * | 2022-01-13 | 2022-04-19 | 湖北汉唐电力器材有限公司 | Hot galvanizing process for power iron accessory and photovoltaic solar bracket |
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| CN114369780A (en) * | 2022-01-13 | 2022-04-19 | 湖北汉唐电力器材有限公司 | Hot galvanizing process for power iron accessory and photovoltaic solar bracket |
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