GB1441044A - Process for the production of iron oxide - Google Patents
Process for the production of iron oxideInfo
- Publication number
- GB1441044A GB1441044A GB788274A GB788274A GB1441044A GB 1441044 A GB1441044 A GB 1441044A GB 788274 A GB788274 A GB 788274A GB 788274 A GB788274 A GB 788274A GB 1441044 A GB1441044 A GB 1441044A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stage
- precipitate
- oxidized
- neutralizing agent
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 title abstract 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title 2
- 239000002244 precipitate Substances 0.000 abstract 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 6
- 239000003795 chemical substances by application Substances 0.000 abstract 4
- 230000003472 neutralizing effect Effects 0.000 abstract 4
- WTFXARWRTYJXII-UHFFFAOYSA-N iron(2+);iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+3].[Fe+3] WTFXARWRTYJXII-UHFFFAOYSA-N 0.000 abstract 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract 3
- 230000001590 oxidative effect Effects 0.000 abstract 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 2
- 239000001034 iron oxide pigment Substances 0.000 abstract 2
- 230000003647 oxidation Effects 0.000 abstract 2
- 238000007254 oxidation reaction Methods 0.000 abstract 2
- 239000000047 product Substances 0.000 abstract 2
- 239000000243 solution Substances 0.000 abstract 2
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 2
- 229910010413 TiO 2 Inorganic materials 0.000 abstract 1
- 229910021529 ammonia Inorganic materials 0.000 abstract 1
- 239000012736 aqueous medium Substances 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 abstract 1
- 230000005587 bubbling Effects 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 abstract 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 abstract 1
- 239000000049 pigment Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000007858 starting material Substances 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- 239000000725 suspension Substances 0.000 abstract 1
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
- C01G49/08—Ferroso-ferric oxide [Fe3O4]
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
1441044 Black iron oxide pigment LAPORTE INDUSTRIES Ltd 10 Feb 1975 [21 Feb 1974] 7882/74 Heading C1A A process for the production of black iron oxide pigment having a blue undertone comprises two or more stages, each comprising firstly treating an aqueous solution of FeSO 4 with a neutralizing agent to precipitate, in the first and any interemediate stage, a part only of the Fe values therein and then oxidizing the, precipitate formed in the first and any intermediate stage to a Fe<SP>+2</SP> : Fe<SP>+3</SP> ratio above 1 : 2 by treating a suspension thereof with an oxidizing gas, wherein the precipitate in the second and any succeeding stage is formed and oxidized in the presence of the oxidized precipitate(s from the preceding stage(s), the oxidation at each stage being conducted at a temperature at least 50‹ C. if the pH is in the range 2-5, and oxidizing the final combined precipitates to black iron oxide. The starting material is preferably a solution of copperas, e.g. from the sulphate preparation of TiO 2 . The initial solution preferably has a Fe<SP>+2</SP> concentration of 10-60 g./l. The quantity of neutralizing agent used in the first stage is preferably sufficient to react with 30-95% of FeSO 4 and is preferably used in excess, e.g. of up to 20% in the final stage. Ammonia is the preferred neutralizing agent, preferably in the form of aqueous NH 4 OH. The precipitation is suitably conducted in each stage with stirring at 50-90‹ C. Each stage, other than the last, employs sufficient neutralizing agent to react with 70-95% of the sulphate. The oxidation is suitably accomplished by bubbling the gas, e.g. air upwardly through the aqueous medium containing the precipitate for 1-4 hours at 50-95‹ C. The precipitate formed in the first and any intermediate stage are preferably oxidized to a Fe<SP>+2</SP> : Fe<SP>+3</SP> ratio of 1-2 : 1, particularly 1À3-1À7 : 1. The combined oxidized precipitates may be allowed to settle or be recovered by filtration and are preferably washed until free of SO 4 . The product may be dried at 50-120‹ C. or spray-dried, the dry product is suitably milled to produce a pigment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB788274A GB1441044A (en) | 1974-02-21 | 1974-02-21 | Process for the production of iron oxide |
| AU78145/75A AU481865B2 (en) | 1974-02-21 | 1975-02-12 | Process forthe production of iron oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB788274A GB1441044A (en) | 1974-02-21 | 1974-02-21 | Process for the production of iron oxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1441044A true GB1441044A (en) | 1976-06-30 |
Family
ID=9841607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB788274A Expired GB1441044A (en) | 1974-02-21 | 1974-02-21 | Process for the production of iron oxide |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1441044A (en) |
-
1974
- 1974-02-21 GB GB788274A patent/GB1441044A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU7814575A (en) | 1976-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |