US3310435A - Process for continuous pickling of steel strip and regeneration of the contact acid - Google Patents
Process for continuous pickling of steel strip and regeneration of the contact acid Download PDFInfo
- Publication number
- US3310435A US3310435A US324479A US32447963A US3310435A US 3310435 A US3310435 A US 3310435A US 324479 A US324479 A US 324479A US 32447963 A US32447963 A US 32447963A US 3310435 A US3310435 A US 3310435A
- Authority
- US
- United States
- Prior art keywords
- pickling
- acid
- solution
- water
- strip
- 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.)
- Expired - Lifetime
Links
- 238000005554 pickling Methods 0.000 title claims description 65
- 239000002253 acid Substances 0.000 title claims description 56
- 230000008929 regeneration Effects 0.000 title claims description 18
- 238000011069 regeneration method Methods 0.000 title claims description 18
- 238000000034 method Methods 0.000 title description 12
- 229910000831 Steel Inorganic materials 0.000 title description 8
- 239000010959 steel Substances 0.000 title description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 14
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000010924 continuous production Methods 0.000 claims description 8
- 229960002089 ferrous chloride Drugs 0.000 claims description 8
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-PWCQTSIFSA-N Tritiated water Chemical compound [3H]O[3H] XLYOFNOQVPJJNP-PWCQTSIFSA-N 0.000 claims 1
- 235000021110 pickles Nutrition 0.000 description 18
- 239000006096 absorbing agent Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 8
- 239000007921 spray Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 235000013980 iron oxide Nutrition 0.000 description 5
- 239000000567 combustion gas Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 241000499489 Castor canadensis Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000011779 Menyanthes trifoliata Nutrition 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
Images
Classifications
-
- 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
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
-
- 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
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S423/00—Chemistry of inorganic compounds
- Y10S423/01—Waste acid containing iron
Definitions
- the present invention relates to a process for continu ous pickling of iron and steel with hydrochloric acid and treatment of the spent pickle liquor to recover the acid therefrom for economical re-use.
- One object of the present invention is to provide a novel and highly eflicient process for hydrochloric acid pickling of steel strip wherein the acid concentration of the pickling solution is economically maintained at optimum levels.
- Another object of the invention is to provide an economical and effective pickle liquor acid regeneration process whereby optimum acid recovery is effected and the iron content of the pickle liquor is recovered for further processing.
- the steel strip S to be treated enters a suitable vertical tower 1, which may be of the order of 70 to 150 feet in height and suitably enclosed to restrict escape of acid fumes.
- a suitable vertical tower 1 which may be of the order of 70 to 150 feet in height and suitably enclosed to restrict escape of acid fumes.
- the steel strip S moves over suitable lower rollers 2 and 2A and upper roller 3 to provide at least one vertically upward and one downward return pass before moving out of the tower over roll 2A and onto rollers 4, 5, 6 for recoiling or further processing.
- a suitable tank 7 containing a suitable supply of hydrochloric acid pickling solution.
- Beneath rolls 4, 5, 6 is another suitable tank 8 wherein the excess acid solution may be rinsed from the strip S before passing to another station where remaining acid thereon may be suitably neutralized before recoiling or passing to any suitable station for further processing, such as cold rolling, etc.
- contact between the pickling solution and the metal is obtained by spraying as distinguished from conventional dipping.
- the tank 7 has therein a suitable quantity of the pickling liquor, wherein the acid content is maintained at a substantially constant volume by admission of regenerated acid from a suitable storage tank (not shown) connected with tank 7 by a suitable conduit (not shown).
- a suitable storage tank not shown
- vent losses from the absorber are made up from time to time by the admission of fresh, concentrated acid. Such losses are a small percentage of the acid entering into the pickling reaction.
- a suitable means such as pump 11
- the solution under pressure from pump 11 passes through conduit 14 from which extend branch conduits 15, 16 and 17 leading into tower 1.
- Each of these latter conduits terminate in suitable spraying devices or nozzles indicated as 15A, 16A and 17A, which direct sprays of the solution upon the exposed inner and outer faces of each up run Su and down run Sd of the strip within the tower.
- the excess solution applied to the strip flows down over both faces of each run of the strip S back into the tank 7 at the bottom of tower 1.
- the thus described cycle of solution is continuously maintained during such periods as strip S is moving through the tower 1.
- the excess solution thereon may be removed by a suitable means, such as a high velocity air jet indicated generally at 18 and squeegee rolls indicated generally at 19.
- the issuing strip S then passes over rolls 4, 5 and 6 through the rinse tank 8 which is supplied with rinse water from any suitable source (not shown).
- the strip issuing from rinse tank 8 passes to further processing or recoiling, as previously described.
- a branch conduit 20 leading therefrom connects with pump 21 which pumps solution from tank 7 through conduit 22 which terminates in a suitable number of branch conduits 23 spraying the solution into the top portion of a suitable roaster device 24.
- Adjacent the bottom portions of the roaster device 24 are suitable air and fuel inlets 25'- injecting a flame into roaster 24.
- the solution is vaporized and the ferrous chloride therein is reacted with the hot combustion gases to provide iron oxide and HCl vapors.
- the oxide is deposited upon the bottom of roaster 24, from which it may be removed by conduit 26 into a suitable oxide container 27.
- the roaster just described is countercurrent, but it will be obvious to those versed in the art that a cocurrent roaster would be equally suitable.
- vapors from the vaporized spray of pickle liquor solution within roaster 24 are withdrawn through a suitable conduit 28 into a suitable gas-solids separating device 29.
- a suitable gas-solids separating device 29 is known in the art as a cyclone.
- any suspended iron oxides in the vapors are removed through conduit 26a.
- These vapors, comprising water, HCl and products of combustion, are then removed from 29 through conduit 30 into the bottom portion of absorber 31 and pass upwardly therethrough.
- the water supplied to absorber 32 may be obtained from two sources, rinse tank 8 or an outside supply.
- tank 8 conduit 34 leading from the bottom portion thereof carries a portion of the rinse water therein to pump 35 which passes the rinse water through conduits 36 and 32 into the top portion of the absorber 31. In this manner recovery may be had of acid in the rinse water. Should additional water be necessary, or desirable, it can be supplied to conduit 32 from a suitable outside source, through conduit 37. Such rinse water as is removed from tank 8, must be replaced therein from any suitable source of fresh water.
- the acid solution placed in a storage tank for feed to tank 7, and for replenishing the acid solution in the tank 7, is a 20% solution of HCl and water, 20% HCl and 80% Water.
- the regenerated acid returned to the acid solution storage tank is preferably maintained at 20% acid by controlling the rate of feed of Water to absorber 31.
- the solution in the tank is comprised of HCl, FeCl and water.
- the solution in the tank 7 will comprise about 11% HCl, about 13% FeCl and about 76% H O.
- the pickling solution in use will be maintained between about and 18% by weight, acid concentration.
- regenerated or make-up acid should be returned to the pickling tank in amounts to compensate for the acid lost during reaction with the oxide on the strip, plus certain physical losses including carryout on the strip in passage from the pickling tank, evaporation, and vapor loss from the top of the absorber.
- the acid regeneration by-product, Fe O is of significant commercial value since it may be sintered or briquetted and returned to the melting furnaces. Such by-product appears to contain about 70% iron and only trace amounts of chloride. Additionally, any trace metals from the strip pass out with the said oxide and are not returned to the pickling solution.
- a continuous process for pickling ferrous metal strip and for regeneration of the used pickling liquor comprising the steps of (a) providing an initial bath of pickling solution of 20% by weight of hydrochloric acid and water,
- a continuous process for pickling ferrous metal strip and for regeneration of the used pickle liquor and returning the regenerated liquor to the pickling operation which comprises the steps of (a) conducting the pickling operation with a pickle liquor having from about 5 to 18% by weight of hydrochloric acid concentration and maintaining the pickle liquor at a temperature of about F. to 200 F. for contact with the ferrous strip,
- a continuous process for pickling moving ferrous metal strip and for regeneration and returning of the used pickle liquor to the pickling step to maintain a desired acid concentration in the pickle liquor in contact with the moving strip comprising the steps of (a) continuously contacting the moving strip with pickle liquor having an acid content maintained in the range of about 5% to 18% by weight of hydrochloric acid and maintaining the contacting liquor at a temperature of from about 140 to 200 F.,
- a portion of the rinse water is continuously withdrawn from the rinsing step in amounts to provide the cooling water to absorb hydrochloric vapors and provide an acid content in the water of about 20% by weight.
- a continuous process for pickling of ferrous metal strip and for regeneration of the pickling liquor during use thereof comprising the steps of (a) providing a pickling liquor comprised of hydrochloric acid and water having an acid concentration of about to 20% by weight of acid,
- a continuous process for pickling ferrous strip metal and for continuous regeneration of the used pickling liquor comprising (a) establishing in sequence a pickling area and a water rinse area,
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Inorganic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US324479A US3310435A (en) | 1963-11-18 | 1963-11-18 | Process for continuous pickling of steel strip and regeneration of the contact acid |
GB27890/64A GB1065388A (en) | 1963-11-18 | 1964-07-07 | Process for continuous pickling of steel strip and regeneration of the contact acid |
DE19641546110 DE1546110A1 (de) | 1963-11-18 | 1964-08-06 | Verfahren zum kontinuierlichen Beizen von Baendern oder dergleichen Gegenstaenden aus Eisen oder Stahl |
FR985469A FR1404958A (fr) | 1963-11-18 | 1964-08-18 | Procédé de décapage continu d'acier en bandes et de régénération du décapant |
BE652825D BE652825A (de) | 1963-11-18 | 1964-09-08 | |
US488031A US3445284A (en) | 1963-11-18 | 1965-09-17 | Process for pickling of steel strip and regeneration of the contact acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US324479A US3310435A (en) | 1963-11-18 | 1963-11-18 | Process for continuous pickling of steel strip and regeneration of the contact acid |
Publications (1)
Publication Number | Publication Date |
---|---|
US3310435A true US3310435A (en) | 1967-03-21 |
Family
ID=23263766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US324479A Expired - Lifetime US3310435A (en) | 1963-11-18 | 1963-11-18 | Process for continuous pickling of steel strip and regeneration of the contact acid |
Country Status (4)
Country | Link |
---|---|
US (1) | US3310435A (de) |
BE (1) | BE652825A (de) |
DE (1) | DE1546110A1 (de) |
GB (1) | GB1065388A (de) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3423240A (en) * | 1965-08-19 | 1969-01-21 | Ford Motor Co | Pickling process |
US3440009A (en) * | 1966-07-19 | 1969-04-22 | Little Inc A | Processing of spent hydrochloric acid pickle liquor |
US3442608A (en) * | 1968-05-06 | 1969-05-06 | Canada Steel Co | Regeneration of waste pickle liquors |
US3443991A (en) * | 1965-12-06 | 1969-05-13 | Georges F Kremm | Process for pickling metal |
US3445284A (en) * | 1963-11-18 | 1969-05-20 | Dravo Corp | Process for pickling of steel strip and regeneration of the contact acid |
US3468707A (en) * | 1966-04-04 | 1969-09-23 | Chem Separations Corp | Hydrolyzer process for steel pickling liquors |
US3495945A (en) * | 1966-07-19 | 1970-02-17 | Dravo Corp | Apparatus for the regeneration of hydrochloric acid from spent pickle liquor and like solutions |
US3502432A (en) * | 1968-09-09 | 1970-03-24 | Ross Eng Co Inc | Reclamation of spent hydrochloric acid |
US3529931A (en) * | 1968-07-12 | 1970-09-22 | Nat Lead Co | Regenerating hci from iron chloride solutions |
DE2434305A1 (de) * | 1974-07-17 | 1976-01-29 | Hoellmueller Maschbau H | Verfahren und anlage zum betrieb einer aetzmaschine |
US4060447A (en) * | 1976-03-29 | 1977-11-29 | Philip A. Hunt Chemical Corporation | Process for etching of metal |
US4197139A (en) * | 1978-08-23 | 1980-04-08 | Hjersted Norman B | Process for the reclamation of acid from spent pickle liquor |
US4389254A (en) * | 1978-10-27 | 1983-06-21 | Centre De Recherches Metallurgiques-Centrum Voor Research In De Metallurgie | Continuous treatment of steel sheet |
US5149515A (en) * | 1987-06-16 | 1992-09-22 | Maschinenfabrik Andritz Actiengesellschaft | Process for the production or recovery of acids from metalliferous solutions of such acids |
US5154774A (en) * | 1985-09-19 | 1992-10-13 | Ugine Aciers De Chatillon Et Gueugnon | Process for acid pickling of stainless steel products |
US5250275A (en) * | 1990-12-13 | 1993-10-05 | Sollac | Process for separating silicon compounds contained in a hydrochloric bath used for pickling |
US5690748A (en) * | 1991-02-25 | 1997-11-25 | Ugine Aciers De Chatillon Et Gueugnon | Process for the acid pickling of stainless steel products |
US5851304A (en) * | 1996-02-27 | 1998-12-22 | Usinor Sacilor | Process for pickling a piece of steel and in particular a sheet strip of stainless steel |
US5911967A (en) * | 1996-12-27 | 1999-06-15 | Ruthner; Michael J. | Process and apparatus for production of ferric oxide from iron chloride solutions |
US5939041A (en) * | 1996-10-30 | 1999-08-17 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Process and apparatus for removing metal oxide particles in the regeneration of pickling acids |
TWI488692B (zh) * | 2013-01-10 | 2015-06-21 | China Steel Corp | Concentration stability control device for regenerated concentrated acid |
CN105624715A (zh) * | 2016-02-29 | 2016-06-01 | 中冶南方工程技术有限公司 | 温控自适应配酸的酸再生系统及其控制方法 |
CN112481625A (zh) * | 2019-09-11 | 2021-03-12 | 中冶南方工程技术有限公司 | 酸再生系统净化方法、酸再生系统及其净化操作方法 |
CN113981459A (zh) * | 2021-10-20 | 2022-01-28 | 北京首钢冷轧薄板有限公司 | 一种酸洗酸再生控制方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2386944A (en) * | 1942-05-09 | 1945-10-16 | Universal Oil Prod Co | Method for recovering hydrogen halide |
US2389457A (en) * | 1943-12-31 | 1945-11-20 | Universal Oil Prod Co | Purification of hydrogen haldes |
US2402978A (en) * | 1944-05-05 | 1946-07-02 | Dow Chemical Co | Process for chlorination of saturated hydrocarbons and recovering hydrochloric acid |
-
1963
- 1963-11-18 US US324479A patent/US3310435A/en not_active Expired - Lifetime
-
1964
- 1964-07-07 GB GB27890/64A patent/GB1065388A/en not_active Expired
- 1964-08-06 DE DE19641546110 patent/DE1546110A1/de active Pending
- 1964-09-08 BE BE652825D patent/BE652825A/xx unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2386944A (en) * | 1942-05-09 | 1945-10-16 | Universal Oil Prod Co | Method for recovering hydrogen halide |
US2389457A (en) * | 1943-12-31 | 1945-11-20 | Universal Oil Prod Co | Purification of hydrogen haldes |
US2402978A (en) * | 1944-05-05 | 1946-07-02 | Dow Chemical Co | Process for chlorination of saturated hydrocarbons and recovering hydrochloric acid |
Cited By (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3445284A (en) * | 1963-11-18 | 1969-05-20 | Dravo Corp | Process for pickling of steel strip and regeneration of the contact acid |
US3423240A (en) * | 1965-08-19 | 1969-01-21 | Ford Motor Co | Pickling process |
US3443991A (en) * | 1965-12-06 | 1969-05-13 | Georges F Kremm | Process for pickling metal |
US3468707A (en) * | 1966-04-04 | 1969-09-23 | Chem Separations Corp | Hydrolyzer process for steel pickling liquors |
US3495945A (en) * | 1966-07-19 | 1970-02-17 | Dravo Corp | Apparatus for the regeneration of hydrochloric acid from spent pickle liquor and like solutions |
US3440009A (en) * | 1966-07-19 | 1969-04-22 | Little Inc A | Processing of spent hydrochloric acid pickle liquor |
US3442608A (en) * | 1968-05-06 | 1969-05-06 | Canada Steel Co | Regeneration of waste pickle liquors |
US3529931A (en) * | 1968-07-12 | 1970-09-22 | Nat Lead Co | Regenerating hci from iron chloride solutions |
US3502432A (en) * | 1968-09-09 | 1970-03-24 | Ross Eng Co Inc | Reclamation of spent hydrochloric acid |
DE2434305A1 (de) * | 1974-07-17 | 1976-01-29 | Hoellmueller Maschbau H | Verfahren und anlage zum betrieb einer aetzmaschine |
US4017343A (en) * | 1974-07-17 | 1977-04-12 | Firma Hans Hollmuller, Maschinenbau | Method of and apparatus for etching |
US4060447A (en) * | 1976-03-29 | 1977-11-29 | Philip A. Hunt Chemical Corporation | Process for etching of metal |
US4147581A (en) * | 1976-03-29 | 1979-04-03 | Philip A. Hunt Chemical Corp. | Etching of metal |
US4197139A (en) * | 1978-08-23 | 1980-04-08 | Hjersted Norman B | Process for the reclamation of acid from spent pickle liquor |
US4389254A (en) * | 1978-10-27 | 1983-06-21 | Centre De Recherches Metallurgiques-Centrum Voor Research In De Metallurgie | Continuous treatment of steel sheet |
US5154774A (en) * | 1985-09-19 | 1992-10-13 | Ugine Aciers De Chatillon Et Gueugnon | Process for acid pickling of stainless steel products |
US5149515A (en) * | 1987-06-16 | 1992-09-22 | Maschinenfabrik Andritz Actiengesellschaft | Process for the production or recovery of acids from metalliferous solutions of such acids |
US5250275A (en) * | 1990-12-13 | 1993-10-05 | Sollac | Process for separating silicon compounds contained in a hydrochloric bath used for pickling |
US5690748A (en) * | 1991-02-25 | 1997-11-25 | Ugine Aciers De Chatillon Et Gueugnon | Process for the acid pickling of stainless steel products |
US5851304A (en) * | 1996-02-27 | 1998-12-22 | Usinor Sacilor | Process for pickling a piece of steel and in particular a sheet strip of stainless steel |
US5992196A (en) * | 1996-02-27 | 1999-11-30 | Usinor | Process for pickling a piece of steel and in particular a sheet strip of stainless steel |
US5939041A (en) * | 1996-10-30 | 1999-08-17 | Andritz-Patentverwaltungs-Gesellschaft M.B.H. | Process and apparatus for removing metal oxide particles in the regeneration of pickling acids |
US5911967A (en) * | 1996-12-27 | 1999-06-15 | Ruthner; Michael J. | Process and apparatus for production of ferric oxide from iron chloride solutions |
TWI488692B (zh) * | 2013-01-10 | 2015-06-21 | China Steel Corp | Concentration stability control device for regenerated concentrated acid |
CN105624715A (zh) * | 2016-02-29 | 2016-06-01 | 中冶南方工程技术有限公司 | 温控自适应配酸的酸再生系统及其控制方法 |
CN105624715B (zh) * | 2016-02-29 | 2017-12-22 | 中冶南方工程技术有限公司 | 温控自适应配酸的酸再生系统及其控制方法 |
CN112481625A (zh) * | 2019-09-11 | 2021-03-12 | 中冶南方工程技术有限公司 | 酸再生系统净化方法、酸再生系统及其净化操作方法 |
CN112481625B (zh) * | 2019-09-11 | 2023-08-25 | 中冶南方工程技术有限公司 | 酸再生系统净化方法、酸再生系统及其净化操作方法 |
CN113981459A (zh) * | 2021-10-20 | 2022-01-28 | 北京首钢冷轧薄板有限公司 | 一种酸洗酸再生控制方法 |
CN113981459B (zh) * | 2021-10-20 | 2023-10-03 | 北京首钢冷轧薄板有限公司 | 一种酸洗酸再生控制方法 |
Also Published As
Publication number | Publication date |
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GB1065388A (en) | 1967-04-12 |
DE1546110A1 (de) | 1970-10-08 |
BE652825A (de) | 1964-12-31 |
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