CN1239077A - Solid-phase catalytic oxidizing process for preparing alpha-Fe2O3 - Google Patents
Solid-phase catalytic oxidizing process for preparing alpha-Fe2O3 Download PDFInfo
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- CN1239077A CN1239077A CN 98112890 CN98112890A CN1239077A CN 1239077 A CN1239077 A CN 1239077A CN 98112890 CN98112890 CN 98112890 CN 98112890 A CN98112890 A CN 98112890A CN 1239077 A CN1239077 A CN 1239077A
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- manganate
- iron
- fe2o3
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- oxidizing process
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Abstract
A solid-phase catalytic oxidizing process for preparing alpha-Fe2O3 includes such steps as crushing iron ore or iron oxide scale as raw material whose total iron content is higher than or equal to 71.2% until the granularity is 150-325 meshes, adding catalyst (0.5-1.5%) of menganate type, high-grade Mn, Co and Ni oxide composition, chlorate type, or nitrate type, oxidizing reaction at 600-980 deg.C for 1-3.5 hr in rotary reactor, water washing, drying and pulverizing. Its advantages include high content of alpha-Fe2O3 (more than 98.5%), easily available raw materials, short process, and no pollution.
Description
The present invention relates to a kind of α-Fe
2O
3Production method, particularly a kind of employing solid catalysis oxidizing process produce α-Fe
2O
3New method.
High-purity α-Fe
2O
3Be one of primary raw material of making soft magnetic ferrite, in ferrite formulations, account for 70%.Soft magnetic ferrite has purposes very widely in electronic products such as colour TV, video recorder, computer, radio-cassette player, communication equipment, market demand is very big.The performance of soft magnetic ferrite is very responsive to component, to raw material α-Fe
2O
3Purity, reactivity and crystal structure all have higher requirements, if chemical purity is higher, crystal structure is good, is easy to make high-grade magnetic device, and process parameters range is wider in the production process, produces easily control.The production process route of alpha-type ferric oxide is many, and traditional processing technology generally is divided into dry method and wet method two big classes.Conventional wet production iron oxide red mainly is take iron sheet, iron filings as raw material makes earlier ferrous salt, adds alkali lye again and passes into air, makes its oxidation generate Fe (OH)
3, oven dry can make Fe
2O
3, this method raw material is easy to get, but the Na that generates
2SO
4Be difficult for to process, Chang Daliang adds water and rushes rare and discharge, and causes environmental pollution, and Na
2SO
4Adsorption capacity stronger, be difficult for washes clean, affect product quality, in process of production, what, the quality of the factors influence products such as concentration of pH value, temperature and the solution of reaction of air capacity; Dry production is take ferrous sulfate, iron oxide yellow, iron oxide black or iron hydroxide and FeOOH etc. as raw material, at high temperature calcines and makes Fe
2O
3, because the raw material difference, process conditions are widely different, the dry technology for production flow process is simple, investment is lower, but waste water, waste gas, dust pollution are all quite serious.
The purpose of this invention is to provide a kind ofly take Iron Ore Powder or iron scale as raw material, select appropriate catalyst to produce α-Fe by the single step reaction catalytic oxidation
2O
3, improving the quality of products, shorten reaction process, reduce product cost, environmental contamination reduction overcomes the main deficiency of prior art.
Be described in detail implementation procedure of the present invention below.
Accompanying drawing 1 is a process flow sheet of the present invention.
As shown in the figure, take total iron content 〉=71.2% Iron Ore Powder or iron scale as raw material, through being crushed to the 150-325 order, the catalyst (manganate, the senior manganese cobalt nickel oxide complex that add 0.5-1.5%, chlorate or Nitrates), constantly pass into air, and passing into simultaneously in the swinging oxidation reactor of the steam that is about air capacity 1-6%, can make α-Fe in oxidizing temperature 600-980 ℃ of lower reaction 1-3.5h2O
3, can make product, α-Fe through washing, drying, micronize again2O
3Content 〉=98.5%.
Catalyst manganate used in the present invention mainly is sodium manganate, sodium permanganate, potassium manganate, potassium permanganate Reach the mixture with manganese dioxide; Chlorate is sodium chlorate, potassium chlorate; Nitrates is sodium nitrate, cobalt nitrate The mantoquita of nickel nitrate and a small amount of nitric acid; Senior manganese cobalt nickel oxide complex is MnO2XNiOyCoO (x, y=0.1-0.2). The swinging oxidation reactor is used in reaction, such as the rotary furnace reactor, reactant is fully contacted, and carries High reaction speed. But in course of reaction, pass into the also accelerating oxidation reaction of steam that is about air capacity 1-6%, convenient Operation.
Advantage of the present invention: by Iron Ore Powder or the high-purity α-Fe of iron scale One-step production
2O
3Cost is lower by 40% than adopting traditional handicraft, and raw material is easy to get, and technological process is short, and pollution-free, catalyst is easy to wash-out, α-Fe
2O
3Content is suitable for suitability for industrialized production greater than 98.5%.
Embodiment 1: take total iron content greater than 71.2% magnetic iron ore as raw material, being crushed to granularity is 325 orders, adds sodium manganate 0.5%, constantly passes into air, and pass into simultaneously the steam that is about air capacity 1-6%, under 750 ℃ in the rotary furnace reactor reaction 2h can make α-Fe
2O
3Crude product can make product through washing, drying, micronize again.
Embodiment 2: take total iron content greater than 71.2% magnetic iron ore as raw material, being crushed to granularity is 200 orders, adds potassium manganate 1.5%, constantly passes into air, and pass into simultaneously the steam that is about air capacity 1-6%, under 850 ℃ in the rotary furnace reactor reaction 1h can make α-Fe
2O
3Crude product can make product through washing, drying, micronize again.
Embodiment 3: take total iron content greater than 71.2% siderite as raw material, being crushed to granularity is 200 orders, adds manganese cobalt nickel oxide complex 0.8%, constantly passes into air, and pass into simultaneously the steam that is about air capacity 1-6%, under 650 ℃ in the rotary furnace reactor reaction 1.5h can make α-Fe
2O
3Crude product can make product through washing, drying, micronize again.
Embodiment 4: work energetically 71.2% siderite take total iron content and be raw material, being crushed to granularity is 200 orders, adds manganese cobalt nickel oxide complex 0.5%, constantly passes into air, and pass into simultaneously the steam that is about air capacity 1-6%, under 850 ℃ in the rotary furnace reactor reaction 2.5h can make α-Fe
2O
3Crude product can make product through washing, drying, micronize again.
Embodiment 5: take total iron content greater than 71.2% iron scale as raw material, being crushed to granularity is 150 orders, adds sodium nitrate 0.8%, constantly passes into air, and pass into simultaneously the steam that is about air capacity 1-6%, under 700 ℃ in the rotary furnace reactor reaction 1.5h can make α-Fe
2O
3Crude product can make product through washing, drying, micronize again.
Claims (3)
1, a kind of solid catalysis oxidizing process is produced α-Fe
2O
3Method; its technical characterictic is: take total iron content 〉=71.2% Iron Ore Powder or iron scale as raw material; through being crushed to the 150-325 order; the manganate, senior manganese cobalt nickel oxide complex, chlorate or the Nitrates catalyst that add 0.5-1.5%; constantly passing into air; and pass into simultaneously in the reactor of the steam that is about air capacity 1-6%, in oxidizing temperature 600-980 ℃ of lower reaction 1-3.5h, can make product through washing, drying, micronize again.
2, a kind of solid catalysis oxidation style according to claim 1 is produced α-Fe
2O
3Method, it is characterized in that: the catalyzer manganate mainly is sodium manganate, sodium permanganate, potassium manganate, potassium permanganate and with the mixture of Manganse Dioxide; Oxymuriate is sodium chlorate, Potcrate; Nitrates is the mantoquita of SODIUMNITRATE, Xiao Suangu, nickelous nitrate and a small amount of nitric acid; Senior manganese cobalt nickel oxide complex is MnO
2XNiOyCoO, x, y=0.1-0.2.
3, a kind of solid catalysis oxidizing process according to claim 1 is produced α-Fe
2O
3Method, it is characterized in that: reactor adopts the swinging oxidation reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112890 CN1239077A (en) | 1998-06-15 | 1998-06-15 | Solid-phase catalytic oxidizing process for preparing alpha-Fe2O3 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98112890 CN1239077A (en) | 1998-06-15 | 1998-06-15 | Solid-phase catalytic oxidizing process for preparing alpha-Fe2O3 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1239077A true CN1239077A (en) | 1999-12-22 |
Family
ID=5222683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98112890 Pending CN1239077A (en) | 1998-06-15 | 1998-06-15 | Solid-phase catalytic oxidizing process for preparing alpha-Fe2O3 |
Country Status (1)
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438616A (en) * | 2006-05-30 | 2007-12-05 | Iop Specialists Sdn Bhd | Iron oxide pigments from mill scale |
| CN102908896A (en) * | 2012-11-01 | 2013-02-06 | 昆明理工大学 | Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst |
| CN106395913A (en) * | 2016-08-26 | 2017-02-15 | 天津大学 | Ferromagnetic nano alpha-Fe2O3 with iron defects, and preparation method thereof |
-
1998
- 1998-06-15 CN CN 98112890 patent/CN1239077A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438616A (en) * | 2006-05-30 | 2007-12-05 | Iop Specialists Sdn Bhd | Iron oxide pigments from mill scale |
| GB2438616B (en) * | 2006-05-30 | 2011-01-05 | Iop Specialists Sdn Bhd | Iron oxide pigments from mill scale |
| CN102908896A (en) * | 2012-11-01 | 2013-02-06 | 昆明理工大学 | Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst |
| CN102908896B (en) * | 2012-11-01 | 2015-07-22 | 昆明理工大学 | Method for catalytically oxidizing NO by dielectric barrier discharge plasma modified catalyst |
| CN106395913A (en) * | 2016-08-26 | 2017-02-15 | 天津大学 | Ferromagnetic nano alpha-Fe2O3 with iron defects, and preparation method thereof |
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