US20040202595A1 - Treatment for waste pickling solutions containing iron and method of ferric oxide formation - Google Patents
Treatment for waste pickling solutions containing iron and method of ferric oxide formation Download PDFInfo
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- US20040202595A1 US20040202595A1 US10/676,113 US67611303A US2004202595A1 US 20040202595 A1 US20040202595 A1 US 20040202595A1 US 67611303 A US67611303 A US 67611303A US 2004202595 A1 US2004202595 A1 US 2004202595A1
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- United States
- Prior art keywords
- ferric oxide
- treatment
- solutions containing
- containing iron
- oxide formation
- 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.)
- Abandoned
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 46
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 27
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims abstract description 27
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000005554 pickling Methods 0.000 title claims abstract description 26
- 239000002699 waste material Substances 0.000 title claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- 239000002253 acid Substances 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000007539 photo-oxidation reaction Methods 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000011033 desalting Methods 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 11
- 239000007788 liquid Substances 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- ZOGDLSBHXXNICW-MBDJGAHPSA-N B.B.C.C.C.C.C.C.C.O.O.O.O.O=C(OO)[Fe][Fe].[2HH] Chemical compound B.B.C.C.C.C.C.C.C.O.O.O.O.O=C(OO)[Fe][Fe].[2HH] ZOGDLSBHXXNICW-MBDJGAHPSA-N 0.000 description 1
- NUXVXPLJKHUYJD-UHFFFAOYSA-I C.Cl.Cl[Fe](Cl)[Fe](Cl)(Cl)Cl.O.O.[Fe] Chemical compound C.Cl.Cl[Fe](Cl)[Fe](Cl)(Cl)Cl.O.O.[Fe] NUXVXPLJKHUYJD-UHFFFAOYSA-I 0.000 description 1
- PXCKGGKGXIORDT-UHFFFAOYSA-L Cl[Fe]Cl.[Fe] Chemical compound Cl[Fe]Cl.[Fe] PXCKGGKGXIORDT-UHFFFAOYSA-L 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000004523 agglutinating effect Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hcl hcl Chemical compound Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- -1 iron ion Chemical class 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to the recovery of solutions utilized for industrial cleaning and processing as well as the extraction of ferric oxide suspended therein, specifically, a treatment for waste pickling solutions containing iron and method of ferric oxide formation.
- pickling process is a commonplace process.
- a pickling normally consists of a hydrochloric acid (HCl) solution that scales steel and iron surfaces, the remnants of which end up as ferric oxide, and thereby enables the further finishing of the said ferrous materials.
- HCl hydrochloric acid
- the pickling efficiency is characterized by an increase in iron content after the onset of the acid wash followed by a corresponding reduction in acid washing efficiency, as shown in the example below:
- the hydrochloride concentration gradually decreases and the iron ion concentration gradually increases during the treatment process such that after a certain period, acid washing efficiency is reduced until all effectiveness is lost and the solution must be replaced.
- the spent acid solution still contains six to 10 percent HCl, a highly corrosive substance that is subject to controls, utilized for industrial processes, and now among the most serious pollutants in the world.
- Keram, Chernie GMBH Method This is basically a flowing bed-type thermal oxidation process capable of recovering HCl and ferric oxide. It generally shares the same advantages as the Ruthner method, but since recovered ferric oxide quality and quantity is poor, only large plants have the requisite capability.
- Waste Water Treatment Method This is a neutralizing, agglutinating, and precipitating approach to obtain large volumes of Fe(OH) 2 from hazardous sludge and, furthermore, does not involve any resources and is the method often utilized by medium- and small-size factories.
- each method essentially involves the storage of the spent acid in separate containers or tanks, where the treatment process is then performed, and treatment cannot be undertaken at the production line.
- manufacturers are required to have remote acid solution tanks for treatment alone that must be replenished and cleaned every three to seven days, a routine that is troublesome and dangerous.
- FIG. 1 is a flowchart of the present invention.
- FIG. 2 is a diagram of the treatment installation of the present invention.
- the treatment method of the present invention consists of processing the pickling solution from a production line situated pickling tank, which is collectively recovered or directly taken from the pickling tank and later undergoes a photochemically induced oxidation reaction procedure and a magnetic culling procedure to complete.
- the spent acid of the present invention in the disposaled waste acid tank A is admitted into the acid recovery equipment B, the said acid recovery equipment B desalts the pickling tank with industrial-use water C to facilitate recovery, and the liquid now having a high iron content and low acidity is forwarded into a mixing tank D, and sodium hydroxide is added into the mixing tank D to adjust the pH value, following which the liquid is run through a filter E, the said filter E being a bag-type screening medium; however, the procedure is not limited to this.
- the spent acid that had been left acid and added into the sodium hydroxide enters a photo-oxidation reaction device F.
- the photo-oxidation reaction device is a tank basically; therefore, the sodium hydroxide and the air can be added depends on the requirement.
- the liquid has a circular loop, namely an ultraviolet beam circuit G, and the ultraviolet beam circuit G irradiates with proper wavelength.
- a stirring device is equipped inside the mixing tank D and the photo-oxidation reaction device F for stirring.
- ferric oxide derivation achievable by the embodiment of the present invention is comparable to that of the Ruthner method, with the chemical analysis shown in the following table: wt % Fe 2 O 3 SiO 2 Cl ⁇ Surface Area Ruthner 98.0-99.8 0.05-1.0 0.08-0.09 1.7-8.0 Present 98.0-99.0 0.08-0.09 0.02-0.05 0.65-0.93 Invention
- Fe 2 O 3 can be utilized as magnetic material that is of higher value than iron itself and, thus enhances its added value as well as effectively solves spent acid treatment problems, especially wet-type, normal temperature treatment, in which the high added-value ferric oxide also affords an ingredient that is totally free of secondary pollution, has a low economy of scale, and involves a facilities cost that is less than that of the Ruthner method widely utilized by large factories and, furthermore, since it is capable of treatment at the production line and controlling the ferrous density of acid solutions in the pickling tank to the most optimal concentration such that productivity is increased, the treatment and method of the present invention is a breakthrough in this field.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Compounds Of Iron (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
A treatment for waste pickling solutions containing iron and method of ferric oxide formation, consisting of spent acid with iron content, the addition therein of sodium hydroxide to adjust the pH value, the execution of a chemical reaction in another tank into which sodium hydroxide and air are added while the admixture is exposed to an ultraviolet beam circuit in a photo-oxidation process, and finally magnetic culling to separate ferric oxide in the solution.
Description
- 1) Field of the Invention
- The present invention relates to the recovery of solutions utilized for industrial cleaning and processing as well as the extraction of ferric oxide suspended therein, specifically, a treatment for waste pickling solutions containing iron and method of ferric oxide formation.
- 2) Description of the Prior Art
- In the metal finishing industry, pickling process is a commonplace process. As for its theoretical basis, a pickling normally consists of a hydrochloric acid (HCl) solution that scales steel and iron surfaces, the remnants of which end up as ferric oxide, and thereby enables the further finishing of the said ferrous materials. As such, the chemical reaction based on the pickling principle is as follows:
- Ferric Oxide from the Pickling of Surfaces
- Ferrous Material: Scale
- Ferrous Material Pickling Reaction
- Additionally, the mechanism of the acid during ferric oxide scaling after the adding of the hydrochloric acid results in the following reaction:
- Pickling Mechanism
- At the same time, the pickling efficiency, as well-known, is characterized by an increase in iron content after the onset of the acid wash followed by a corresponding reduction in acid washing efficiency, as shown in the example below:
- As a result, the hydrochloride concentration gradually decreases and the iron ion concentration gradually increases during the treatment process such that after a certain period, acid washing efficiency is reduced until all effectiveness is lost and the solution must be replaced. In simple terms, the spent acid solution still contains six to 10 percent HCl, a highly corrosive substance that is subject to controls, utilized for industrial processes, and now among the most serious pollutants in the world.
- Acid processing methods in current steel and iron industries can be listed in several types below and, furthermore, each has its advantages and disadvantages:
- (1) Ruthner Method: This process is a spray roasting approach capable of recovering hydrochloric acid and Fe 2O3. Its advantages are low pollution, total resource recovery, and a sufficiently high level of technology, with the disadvantages including considerable capital investment, high operating cost, and difficult maintenance. As such, only large-scale steel and iron manufacturers have the capacity to utilize this method.
- (2) Keram, Chernie GMBH Method: This is basically a flowing bed-type thermal oxidation process capable of recovering HCl and ferric oxide. It generally shares the same advantages as the Ruthner method, but since recovered ferric oxide quality and quantity is poor, only large plants have the requisite capability.
- (3) Chlorination Method (or Distillation Method): Consists of a concentrated chlorinating solution process to obtain FeCl 3(aq), FeCl3+6H2O(s), and other by-products. The advantages are moderate investment, equipment, and operating costs, with the disadvantages including serious air pollution to the extent that marketing the derived by-products is difficult.
- (4) Waste Water Treatment Method: This is a neutralizing, agglutinating, and precipitating approach to obtain large volumes of Fe(OH) 2 from hazardous sludge and, furthermore, does not involve any resources and is the method often utilized by medium- and small-size factories.
- (5) Transport and Discard Method: This is the most inefficient method and since it consists of unlawfully dumped refuse that results in environmental pollution, the approach is prohibited.
- (6) Sulfuric Acid Displacement Method: A process consisting of displacing HCl in spent acid with sulfuric acid to produce ferrous sulphate. Now in the research stage, its commerical product viability has not been established, but product direction is limited and purity is questionable.
- In addition to the advantages and disadvantages of the said methods, each method essentially involves the storage of the spent acid in separate containers or tanks, where the treatment process is then performed, and treatment cannot be undertaken at the production line. As a result, manufacturers are required to have remote acid solution tanks for treatment alone that must be replenished and cleaned every three to seven days, a routine that is troublesome and dangerous.
- In view of the said situation, the applicant conducted extensive research and experimentation based on years of experience gained while engaged in the fields of environmental protection and resource recycling to overcome the drawbacks of said methods that culminated in the successful development of the treatment for waste pickling solutions containing iron and method of ferric oxide formation of the present invention which provides for a treatment method at the production line capable of maintaining the optimal acidity and iron concentration of acid wash tank solutions as well as a ensuring total resource utilization.
- To enable a further understanding of the general technological content of the present invention, the brief description of the drawings below are followed by the detailed description of the present invention.
- The present invention can be more fully understood by reference to the following detailed description and accompanying drawings, in which:
- FIG. 1 is a flowchart of the present invention; and
- FIG. 2 is a diagram of the treatment installation of the present invention.
- As shown in the FIGS. 1, the treatment method of the present invention consists of processing the pickling solution from a production line situated pickling tank, which is collectively recovered or directly taken from the pickling tank and later undergoes a photochemically induced oxidation reaction procedure and a magnetic culling procedure to complete.
- As indicated in FIG. 2, the spent acid of the present invention in the disposaled waste acid tank A is admitted into the acid recovery equipment B, the said acid recovery equipment B desalts the pickling tank with industrial-use water C to facilitate recovery, and the liquid now having a high iron content and low acidity is forwarded into a mixing tank D, and sodium hydroxide is added into the mixing tank D to adjust the pH value, following which the liquid is run through a filter E, the said filter E being a bag-type screening medium; however, the procedure is not limited to this.
- Following filtration, the spent acid that had been left acid and added into the sodium hydroxide enters a photo-oxidation reaction device F. The photo-oxidation reaction device is a tank basically; therefore, the sodium hydroxide and the air can be added depends on the requirement. Meanwhile, the liquid has a circular loop, namely an ultraviolet beam circuit G, and the ultraviolet beam circuit G irradiates with proper wavelength. As shown in FIG. 2, in order to react completely, a stirring device is equipped inside the mixing tank D and the photo-oxidation reaction device F for stirring.
- Referring to the drawings, since iron particles are disassociated after the photo-oxidation of the liquid, a magnetic culling procedure is executed for further solids separation such that the iron particulate still suspended as solids in the liquid are separated by magnetic attraction as ferric oxide particles and, furthermore, overflowing water utilized is only released after undergoing a desalting process to avert environmental pollution problems.
- To demonstrate that the present invention is workable, the applicant provides the following chemical reactions as evidence.
-
- The ferric oxide derivation achievable by the embodiment of the present invention is comparable to that of the Ruthner method, with the chemical analysis shown in the following table:
wt % Fe2O3 SiO2 Cl− Surface Area Ruthner 98.0-99.8 0.05-1.0 0.08-0.09 1.7-8.0 Present 98.0-99.0 0.08-0.09 0.02-0.05 0.65-0.93 Invention - As is well-known, Fe 2O3 can be utilized as magnetic material that is of higher value than iron itself and, thus enhances its added value as well as effectively solves spent acid treatment problems, especially wet-type, normal temperature treatment, in which the high added-value ferric oxide also affords an ingredient that is totally free of secondary pollution, has a low economy of scale, and involves a facilities cost that is less than that of the Ruthner method widely utilized by large factories and, furthermore, since it is capable of treatment at the production line and controlling the ferrous density of acid solutions in the pickling tank to the most optimal concentration such that productivity is increased, the treatment and method of the present invention is a breakthrough in this field.
- The disclosure of the present invention is but one most preferred embodiment and all modification and embellishments based on the technical concepts of the present invention by persons skilled in the technology shall not remain protected by the patented scope and claims of the present invention.
- In summation of the foregoing section, since the present invention possess technological features differing from that of the prior art, the present invention meets patent application requirements and is submitted to the examination committee for review and the granting of the commensurate patent rights.
Claims (10)
1. A treatment for waste pickling solutions containing iron and method of ferric oxide formation, consisting of spent acid with iron content, the addition therein of sodium hydroxide to adjust the pH value, the execution of a chemical reaction in another tank into which sodium hydroxide and air are added while the admixture is exposed to an ultraviolet beam circuit in a photo-oxidation process, and finally magnetic culling to separate ferric oxide in the said solution.
2. A treatment for waste pickling solutions containing iron and method of ferric oxide formation as claimed in claim 1 , in which the said acid is purged with industrial-use water.
3. A treatment for waste pickling solutions containing iron and method of ferric oxide formation as claimed in claim 1 , in which after the pH value of the acid solution is adjusted, it is filtered and then subjected to the said photo-oxidation process.
4. A treatment for waste pickling solutions containing iron and method of ferric oxide formation as claimed in claim 1 , in which the said pH value adjustment and photo-oxidation procedures involve stirring and the admission of air to achieve an even reaction.
5. A treatment for waste pickling solutions containing iron and method of ferric oxide formation as claimed in claim 1 , in which following the said magnetic culling, effluent is subjected to a desalting process to achieve compliance with water discharge standards.
6. A treatment for waste pickling solutions containing iron and method of ferric oxide formation as claimed in claim 1 , in which the said ferric oxide is dehydrated after the said magnetic culling.
7. A treatment for waste pickling solutions containing iron and system of ferric oxide formation comprised of:
a spent acid tank for storing industrial cleaning and processing solutions containing iron;
a pH value adjustment device that is connected to spent acid recovery equipment and, furthermore, connected to a pipeline which provides for the adding of sodium hydroxide;
a photo-oxidation reaction device that is connected to the pH value adjustment tank and which has an ultraviolet beam circuit which enables the execution of a photo-oxidation process; and
a magnetic culling device that separates ferric oxide in the said solution.
8. A treatment for waste pickling solutions containing iron and system of ferric oxide formation as claimed in claim 7 , in which the said pH value adjustment device is equipped with a stirring device.
9. A treatment for waste pickling solutions containing iron and system of ferric oxide formation as claimed in claim 7 , in which the said photo-oxidation reaction device is equipped with a stirring device.
10. A treatment for waste pickling solutions containing iron and system of ferric oxide formation as claimed in claim 7 , in which the said spent acid tank is capable of operation at production lines.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW091123033 | 2002-10-04 | ||
| TW91123033 | 2002-10-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20040202595A1 true US20040202595A1 (en) | 2004-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/676,113 Abandoned US20040202595A1 (en) | 2002-10-04 | 2003-10-02 | Treatment for waste pickling solutions containing iron and method of ferric oxide formation |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20040202595A1 (en) |
| JP (1) | JP2004123530A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090145856A1 (en) * | 2007-12-11 | 2009-06-11 | Raymond Letize A | Acid recycle process with iron removal |
| CN102689930A (en) * | 2011-03-24 | 2012-09-26 | 镇江市丹徒区江南热镀锌有限公司 | Hydrochloric acid pickling waste liquid resource integrated utilization method for preparing iron oxide and ammonium sulfate |
| CN105439209A (en) * | 2015-11-12 | 2016-03-30 | 同济大学 | Method for preparing ozone oxidation catalyst gamma-FeOOH after neutralization of waste acid by using nickel laterite ores |
| CN115215377A (en) * | 2022-06-08 | 2022-10-21 | 日照宝华新材料有限公司 | Production system and production process for producing iron oxide powder by self-circulation of waste acid |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6731261B2 (en) * | 2016-03-07 | 2020-07-29 | オルガノ株式会社 | Heavy metal-containing water treatment device and treatment method |
-
2003
- 2003-10-02 US US10/676,113 patent/US20040202595A1/en not_active Abandoned
- 2003-10-03 JP JP2003346303A patent/JP2004123530A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090145856A1 (en) * | 2007-12-11 | 2009-06-11 | Raymond Letize A | Acid recycle process with iron removal |
| WO2009075710A1 (en) * | 2007-12-11 | 2009-06-18 | Macdermid, Incorporated | Acid recycle process with iron removal |
| CN102689930A (en) * | 2011-03-24 | 2012-09-26 | 镇江市丹徒区江南热镀锌有限公司 | Hydrochloric acid pickling waste liquid resource integrated utilization method for preparing iron oxide and ammonium sulfate |
| CN105439209A (en) * | 2015-11-12 | 2016-03-30 | 同济大学 | Method for preparing ozone oxidation catalyst gamma-FeOOH after neutralization of waste acid by using nickel laterite ores |
| CN115215377A (en) * | 2022-06-08 | 2022-10-21 | 日照宝华新材料有限公司 | Production system and production process for producing iron oxide powder by self-circulation of waste acid |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004123530A (en) | 2004-04-22 |
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