US2289258A - Process for the manufacture of iron oxide - Google Patents
Process for the manufacture of iron oxide Download PDFInfo
- Publication number
- US2289258A US2289258A US299761A US29976139A US2289258A US 2289258 A US2289258 A US 2289258A US 299761 A US299761 A US 299761A US 29976139 A US29976139 A US 29976139A US 2289258 A US2289258 A US 2289258A
- Authority
- US
- United States
- Prior art keywords
- hydroxide
- ferrous
- ferric
- electrolysis
- iron oxide
- 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
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title description 20
- 238000000034 method Methods 0.000 title description 16
- 238000004519 manufacturing process Methods 0.000 title description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 15
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 14
- 238000005868 electrolysis reaction Methods 0.000 description 14
- 238000009835 boiling Methods 0.000 description 10
- 239000000049 pigment Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 9
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000002002 slurry Substances 0.000 description 8
- 239000011780 sodium chloride Substances 0.000 description 7
- 239000005708 Sodium hypochlorite Substances 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 6
- 229960004887 ferric hydroxide Drugs 0.000 description 6
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 6
- -1 pigments Chemical compound 0.000 description 6
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 6
- 230000001376 precipitating effect Effects 0.000 description 5
- 235000003891 ferrous sulphate Nutrition 0.000 description 4
- 239000011790 ferrous sulphate Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- RGCKGOZRHPZPFP-UHFFFAOYSA-N alizarin Chemical compound C1=CC=C2C(=O)C3=C(O)C(O)=CC=C3C(=O)C2=C1 RGCKGOZRHPZPFP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000001054 red pigment Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000001058 brown pigment Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000001034 iron oxide pigment Substances 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- ACWBQPMHZXGDFX-QFIPXVFZSA-N valsartan Chemical class C1=CC(CN(C(=O)CCCC)[C@@H](C(C)C)C(O)=O)=CC=C1C1=CC=CC=C1C1=NN=NN1 ACWBQPMHZXGDFX-QFIPXVFZSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/22—Compounds of iron
- C09C1/24—Oxides of iron
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- 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
- Y10S423/02—Sulfuric acid
Definitions
- This invention relates to processes for the manufacture of iron oxide of the kind comprising precipitating a ferrous hydroxide by the electrolysis with iron electrodes of a solution of ionizable alkaline metal salts such as sodium and/or potassium salt.
- the object of the invention is to provide a process for the manufacture of iron oxide for use mainly as a black, brown or red pigment of According to one process an electrolyte of 'sodium chloride or sodium sulphate of density sp. gr. 1.10 is introduced into wood vats, into which are placed iron or mild steel anodes connected to a supply of D. C. current.
- the electrolyte is maintained at a temperature of 80 to 90 C., and the current density is approximately .3 amp. per square inch.
- the product after drying is a black hydroxide
- the black hydroxide is calcined in q n y brought together Outside the electrolya suitable furnace with excess air, the degree of sis cell to precipitate the ferrous oxide which temperature affecting the resulting colour.
- oxidised mother liquor example at 2Q0 C. a brown is obtained I have found that by Producing the iron oxide at 600 0.
- a bright Turkey red is obtained, at electrolytically, a finer quality of pigment is ob- 00 a, deep Turkey red and at 10000 an tained than with chemical methods, and accorddian red pigment is produced.
- the electrolytic me In drder to produce a maroon or ochre like eipiieiion 9 the 'PP hydroxlde 1S cqmbmed pigment in an alternative process the paste from the -o of the made the filter press is mixed with water to form a ciplta'Ped Whlle Stm m suspanslol ⁇ m the 6180' slurry.
- an oxidizing agent, trolytic bath to produce a ferric-ferrous hypreferably a solution of sodium hypocmorite dmxide' m f t 4 which oxidizing agent is preferably made by In.add1t1n to the Q 0 plgmen 0 electrolysis of sodium chloride.
- trolysis current is preferably reversed at inter- It 15 Important that the oxidizing ent be vals of about 30 minutes. Otherwise there is a introduced apart m t e ct o te. tendency for metallic iron coming down as black By calcining with excess of air as mentioned specks in connection with the first process a similar range of shades from light maroon or ochre to dark maroon may be obtained.
- an electrolysis vat containing sodium chloride is connected in closed circuit with the mixing vat.
- Sodium hypochlorite from the electrolysis vat is admitted to the mixing vat and at the same time the mixture in the mixing vat is subjected to boiling.
- Sodium hypochlorite is continued to be admitted to the mixing vat until the required amount of oxidation has taken place as a result of the combined action of the 7 liquor in the mixing vat--which is sodium chloride,is pumped back to the electrolysis vat.
- Ferric sulphate is now added to the paste in the mixing vat and boiling is continued until the ferric hydroxide ochre or ferrite pigment is obtained.
- the pigment is then transferred to a second filter press, separated and washed anddried, and if desired calcined to temperatures depending on the depth of colour required.
- iron oxide pigment from black to deep reds, maroons or ochres of a purity of 99.5% is obtained.
- the process for producing maroon or ochre like pigments comprising precipitating ferrous hydroxide by the electrolysis with iron electrodes of a solution of an ionizable alkali metal salt, and oxidising the ferrous hydroxide precipitated while in suspension in the electrolysis bath to produce a ferric ferrous hydroxide, washing with water the ferric ferrous hydroxide, separating the said hydroxide, mixing the hydroxide. with water to form a slurry, adding an oxidising agent to said slurry, boiling the mixture until a ferric hydroxide of uniform light brown colour is obtained, then adding ferrous sulphate and continuing boiling until a ferric hydroxide ochre pigment known as ferrite is obtained.
- the process for producing maroon or ochre like pigments comprising precipitating ferrous hydroxide by the electrolysis with iron electrodes of a solution of an ionizable alkali metal salt, and oxidising the ferrous hydroxide precipitated while in suspension in the electrolysis bath to produce a ferric ferrous hydroxide, washing with water the ferric ferrous hydroxide, separating the said hydroxide, mixing the hydroxide with water to form a slurry.'adding sodium hypochlorite to said slurry, boiling the mixture until a uniform light brown colour is obtained, then adding ferrous sulphate and continuing boiling until a ferric hydroxide ochre pigment known as ferrite is obtained.
- the process for producing maroon or ochre like pigments comprising precipitating ferrous hydroxide by the electrolysis with iron electrodes of a solution of an ionizable alkali metal salt, and oxidising the ferrous hydroxide precipitated while in suspension in the electrolysis bath to produce a ferric ferrous hydroxide, washing with water the ferric ferrous hydroxide, separating the said hydroxide, mixing the hydroxide with water to form a slurry, adding to said slurry sodium hypochlorite which is obtained by the electrolysis of sodium chloride, the sodium hypochlorite giving up its oxygen during the first boiling and the resulting restored sodium chloride being used again in the electrolysis process for producing the sodium hypochlorite, the same sodium chloride thus being usable continually as an oxygen carrier for the oxidation step, boiling the mixture until a uniform light brown colour is obtained, then adding ferrous sulphate and continuing boiling until a ferric hydroxide ochre pigment known as ferrite is obtained.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Iron (AREA)
Description
Patented July 7, 1942 Thomas Glenwright French, Newcastle-on-Tyne, England, assignor to The Priestman Collieries Limited, Newcastle-on-Tyne, England, a British company No Drawing. Application October 16, 1939, Serial No. 299,761. In Great Britain September 30,
3 Claims. (01. 23-200) This invention relates to processes for the manufacture of iron oxide of the kind comprising precipitating a ferrous hydroxide by the electrolysis with iron electrodes of a solution of ionizable alkaline metal salts such as sodium and/or potassium salt.
The object of the invention is to provide a process for the manufacture of iron oxide for use mainly as a black, brown or red pigment of According to one process an electrolyte of 'sodium chloride or sodium sulphate of density sp. gr. 1.10 is introduced into wood vats, into which are placed iron or mild steel anodes connected to a supply of D. C. current.
The electrolyte is maintained at a temperature of 80 to 90 C., and the current density is approximately .3 amp. per square inch.
The electrolysis produces a bluish white premaximum purity, and which will be cheaper to cipitate of ferrous hydroxide of an extremely carry into effect than has been the case hitherto. tenuous nature. Owing to the exposure of the Heretofore proposals have been made for the electrolyte to the atmosphere, this precipitate in production of iron oxide for the manufacture of time would become oxidised to a black ferricpigments which have consisted in precipitating ferrous hydroxide. However to accelerate the a ferrous oxide by the chemical process of addprocess of oxidation, air is continuously blown ing hydrate of lime, carbonate of soda or the into the electrolyte. The continuous blowing of equivalent, to a solution of a ferrous salt such air into the electrolyte also results in a precipias ferrous sulphate, and oxidising the precipitate which settles easily and more readily'sepatated ferrous oxide by blowing air into the solurates from the electrolyte by filtration in a filter tion containing the precipitate to convert the press. The black hydroxide is washed with water ferrous to ferric oxide. In another proposal, the in a filter press, dried in a hot air oven at 100 ferrous oxide was precipitated electrolytically, C., and subsequently ground to the requisite fineremoved from the electrolytic bath, washed and ness in a suitable mill. dried, and then roasted to produce ferric oxide. The product after drying is a black hydroxide According to another electrolytic process, the of iron, stable at 100 C. solutions produced at the respective electrodes To produce th r 0 101115 of oxid from brown were each led away in separate streams and subt deep r d, the black hydroxide is calcined in q n y brought together Outside the electrolya suitable furnace with excess air, the degree of sis cell to precipitate the ferrous oxide which temperature affecting the resulting colour. For was Subsequently oxidised mother liquor. example at 2Q0 C. a brown is obtained I have found that by Producing the iron oxide at 600 0. a bright Turkey red is obtained, at electrolytically, a finer quality of pigment is ob- 00 a, deep Turkey red and at 10000 an tained than with chemical methods, and accorddian red pigment is produced. ing to the present invention the electrolytic me In drder to produce a maroon or ochre like eipiieiion 9 the 'PP hydroxlde 1S cqmbmed pigment, in an alternative process the paste from the -o of the made the filter press is mixed with water to form a ciplta'Ped Whlle Stm m suspanslol} m the 6180' slurry. To the slurry is added an oxidizing agent, trolytic bath to produce a ferric-ferrous hypreferably a solution of sodium hypocmorite dmxide' m f t 4 which oxidizing agent is preferably made by In.add1t1n to the Q 0 plgmen 0 electrolysis of sodium chloride. The whole mixobtamed by electrolytic precipitation of the iron ture is then boiled until a ferric hydroxide of oxide as above mentioned, the process according niform 1i ht brown c010 is btained F to the invention reduces the number of reagents :ulnh o epmus ate is then added and the boiling continued employed to a minimum, and, with the oonvenm f h d hr t k ience'of cheap electric power for the electrolytic 1 3 ,5 g e plgmen nown as precipitation, enables the complete process to be em 8 OW 1s orme carried out in one industrial-as distinct from The Plgment separated y means Of a filter chemicaloperation, and so gives an improved g g: Ki ali wlth water and the Paste dned n 1 nt by means of a cheap and co Ven e If desired air may lie blown through in addi- In order t obtain maximmn purity the l tion the step of adding the oxidizing agent. trolysis current is preferably reversed at inter- It 15 Important that the oxidizing ent be vals of about 30 minutes. Otherwise there is a introduced apart m t e ct o te. tendency for metallic iron coming down as black By calcining with excess of air as mentioned specks in connection with the first process a similar range of shades from light maroon or ochre to dark maroon may be obtained.
According to one example of the above alternative process, an electrolysis vat containing sodium chloride is connected in closed circuit with the mixing vat. Sodium hypochlorite from the electrolysis vat is admitted to the mixing vat and at the same time the mixture in the mixing vat is subjected to boiling. Sodium hypochlorite is continued to be admitted to the mixing vat until the required amount of oxidation has taken place as a result of the combined action of the 7 liquor in the mixing vat--which is sodium chloride,is pumped back to the electrolysis vat.
Ferric sulphate is now added to the paste in the mixing vat and boiling is continued until the ferric hydroxide ochre or ferrite pigment is obtained.
The pigment is then transferred to a second filter press, separated and washed anddried, and if desired calcined to temperatures depending on the depth of colour required.
By the process according to the invention iron oxide pigment from black to deep reds, maroons or ochres of a purity of 99.5% is obtained.
I claim:
1. The process for producing maroon or ochre like pigments, comprising precipitating ferrous hydroxide by the electrolysis with iron electrodes of a solution of an ionizable alkali metal salt, and oxidising the ferrous hydroxide precipitated while in suspension in the electrolysis bath to produce a ferric ferrous hydroxide, washing with water the ferric ferrous hydroxide, separating the said hydroxide, mixing the hydroxide. with water to form a slurry, adding an oxidising agent to said slurry, boiling the mixture until a ferric hydroxide of uniform light brown colour is obtained, then adding ferrous sulphate and continuing boiling until a ferric hydroxide ochre pigment known as ferrite is obtained.
2. The process for producing maroon or ochre like pigments, comprising precipitating ferrous hydroxide by the electrolysis with iron electrodes of a solution of an ionizable alkali metal salt, and oxidising the ferrous hydroxide precipitated while in suspension in the electrolysis bath to produce a ferric ferrous hydroxide, washing with water the ferric ferrous hydroxide, separating the said hydroxide, mixing the hydroxide with water to form a slurry.'adding sodium hypochlorite to said slurry, boiling the mixture until a uniform light brown colour is obtained, then adding ferrous sulphate and continuing boiling until a ferric hydroxide ochre pigment known as ferrite is obtained.
3. The process for producing maroon or ochre like pigments, comprising precipitating ferrous hydroxide by the electrolysis with iron electrodes of a solution of an ionizable alkali metal salt, and oxidising the ferrous hydroxide precipitated while in suspension in the electrolysis bath to produce a ferric ferrous hydroxide, washing with water the ferric ferrous hydroxide, separating the said hydroxide, mixing the hydroxide with water to form a slurry, adding to said slurry sodium hypochlorite which is obtained by the electrolysis of sodium chloride, the sodium hypochlorite giving up its oxygen during the first boiling and the resulting restored sodium chloride being used again in the electrolysis process for producing the sodium hypochlorite, the same sodium chloride thus being usable continually as an oxygen carrier for the oxidation step, boiling the mixture until a uniform light brown colour is obtained, then adding ferrous sulphate and continuing boiling until a ferric hydroxide ochre pigment known as ferrite is obtained.
THOMAS GLENWRIGHT FRENCH.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2289258X | 1938-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2289258A true US2289258A (en) | 1942-07-07 |
Family
ID=10903123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US299761A Expired - Lifetime US2289258A (en) | 1938-09-30 | 1939-10-16 | Process for the manufacture of iron oxide |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2289258A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2429209A (en) * | 1944-03-28 | 1947-10-21 | Sherwin Williams Co | Manufacture of iron hydrate |
| US2656282A (en) * | 1951-01-26 | 1953-10-20 | Wheatland Tube Co | Method for the production of iron oxide from ferrous solutions |
| US3073763A (en) * | 1958-04-17 | 1963-01-15 | Magneto Chemie N V | Electrolytic production of mixed metal oxides |
| US3141835A (en) * | 1960-02-05 | 1964-07-21 | Electro Chimie Metal | Method and apparatus for determining oxygen in a molten halogenated bath |
| US3256162A (en) * | 1962-03-02 | 1966-06-14 | Paul S Roller | Method for the electrolytic production of metal hydroxides |
-
1939
- 1939-10-16 US US299761A patent/US2289258A/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2429209A (en) * | 1944-03-28 | 1947-10-21 | Sherwin Williams Co | Manufacture of iron hydrate |
| US2656282A (en) * | 1951-01-26 | 1953-10-20 | Wheatland Tube Co | Method for the production of iron oxide from ferrous solutions |
| US3073763A (en) * | 1958-04-17 | 1963-01-15 | Magneto Chemie N V | Electrolytic production of mixed metal oxides |
| US3141835A (en) * | 1960-02-05 | 1964-07-21 | Electro Chimie Metal | Method and apparatus for determining oxygen in a molten halogenated bath |
| US3256162A (en) * | 1962-03-02 | 1966-06-14 | Paul S Roller | Method for the electrolytic production of metal hydroxides |
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