CN109666805A - A kind of ilmenite low-temperature reduction technique - Google Patents
A kind of ilmenite low-temperature reduction technique Download PDFInfo
- Publication number
- CN109666805A CN109666805A CN201811589287.0A CN201811589287A CN109666805A CN 109666805 A CN109666805 A CN 109666805A CN 201811589287 A CN201811589287 A CN 201811589287A CN 109666805 A CN109666805 A CN 109666805A
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- China
- Prior art keywords
- ilmenite
- magnetic separation
- low
- reduction technique
- coal dust
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Classifications
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- 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
- C22B34/00—Obtaining refractory metals
- C22B34/10—Obtaining titanium, zirconium or hafnium
- C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
- C22B34/1204—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent
- C22B34/1209—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent by dry processes, e.g. with selective chlorination of iron or with formation of a titanium bearing slag
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
Abstract
The present invention provides a kind of ilmenite low-temperature reduction technique, comprising the following steps: under normal temperature conditions, ilmenite and coal dust 5:1 in mass ratio~1.2 are mixed；Material is sent into rotary kiln or tunnel oven after mixing, firing coal-dust, is heated to 600 DEG C~700 DEG C 0.5~1h of reaction；After being cooled to room temperature after reaction, material after cooling is handled through gas flow sizing machine, and carries out magnetic separation twice, is carried out first time magnetic separation prior to 1000-2000Gs, is obtained titanium-containing magnet mine and tailing, and tailing is carried out second of magnetic separation then at 5000-8000Gs, obtains ilmenite concentrate.The present invention makees reducing agent under middle cryogenic conditions, using coal dust, using rotary kiln or tunnel oven, significantly improves the solubility of ilmenite, while improving TiO2Main content obtains titanium-containing magnet mine and high-quality ilmenite concentrate, reduces the production cost of titanium dioxide, improve the quality of titanium dioxide.
Description
Technical field
The present invention relates to ilmenite technical field, in particular to a kind of ilmenite low-temperature reduction technique.
Background technique
Ilmenite is the primary raw material for manufacturing titanium dioxide and titanium alloy, to consume ten thousand tons of 700-750 every year in China at present,
Wherein most comes from beach placer.Beach placer is washed away by air and water flow for a long time, forms the big portion FeO of ilmenite molecule
Divide and has been oxidized to Fe2O3, since the ilmenite after oxidation is difficult to dissolve, titanium dioxide enterprise will increase very big production cost,
So there is ten thousand tons of 200-300 of ilmenite to overstock in warehouse every year.The country has a kind of facture to be called reduction titanium at present,
It is carried out at 1100 DEG C of high temperature, the product of generation is easily reoxidized by air, and not only cost is very high, and produces a large amount of
Metallic iron causes titanium dioxide industry not to be available.Therefore it is badly in need of a kind of ilmenite low-temperature reduction technique, solve above-mentioned technical problem.
Summary of the invention
For mirror with this, the present invention proposes a kind of ilmenite low-temperature reduction technique, solves above-mentioned technical problem.
The technical scheme of the present invention is realized as follows:
A kind of ilmenite low-temperature reduction technique, it is characterised in that: the following steps are included:
S1, mixing: under normal temperature conditions, ilmenite and coal dust 5:1 in mass ratio~1.2 are mixed；
S2, reaction: sending material into rotary kiln or tunnel oven after mixing, firing coal-dust, is heated to 600 DEG C~700 DEG C
React 0.5~1h；
S3, separation: after being cooled to room temperature after reaction, material after cooling is handled through gas flow sizing machine, and carries out magnetic twice
Choosing carries out first time magnetic separation prior to 1000-2000Gs, obtains titanium-containing magnet mine and tailing, and tailing is carried out then at 5000-8000Gs
Second of magnetic separation, obtains ilmenite concentrate.
Preferably, the mass ratio that S1 step, ilmenite and coal dust are pressed is 5:1.
Preferably, S2 step is heated to 630 DEG C~650 DEG C.
Preferably, S3 step, the field strength of the first time magnetic separation are 1300-1500Gs；The field strength of second of magnetic separation is
6000-6500Gs。
Compared with prior art, the beneficial effects of the present invention are:
The present invention makees reducing agent under middle cryogenic conditions, using coal dust, using rotary kiln or tunnel oven, realizes in ilmenite
Fe2O3It is reduced into FeO, significantly improves the solubility of ilmenite, while improving TiO2High-quality ilmenite concentrate is made in main content, reduces
The production cost of titanium dioxide improves the quality of titanium dioxide.The quality that the present invention improves ilmenite under conditions of middle low temperature refers to
Mark, the product for avoiding conventional high-temperature condition from handling are reoxidized and at high cost, and the ilmenite that the present invention is restored no longer is weighed
New oxidation, has at low cost, stable product quality, and adaptable feature can significantly reduce the cost of downstream titanium dioxide user, mention
The quality level of high entire titanium dioxide industry.
Specific embodiment
In order to be best understood from the technology of the present invention content, specific embodiment is provided below, the present invention is described further.
Experimental method used in the embodiment of the present invention is conventional method unless otherwise specified.
Material used in the embodiment of the present invention, reagent etc., are commercially available unless otherwise specified.
A kind of ilmenite low-temperature reduction technique, comprising the following steps:
S1, mixing: under normal temperature conditions, ilmenite and coal dust 5:1 in mass ratio~1.2 are mixed；
S2, reaction: equably sending material into rotary kiln or tunnel oven after mixing, in the another of rotary kiln or tunnel oven
One end has one to light mouth, by lighting the coal dust of recycling, to being heated to 600 DEG C~700 DEG C in entire rotary kiln or tunnel oven
0.5~1h is reacted, material is slowly run to discharge end from feed end, and temperature also gradually rises, until at 500 DEG C or more, coal dust
In part of coal and air in oxygen generate carbon monoxide, carbon monoxide immediately with the Fe in ilmenite2O3FeO is reduced into,
Material is discharged after Carbon monoxide reduction from rotary kiln or tunnel oven discharge end；
S3, separation: reacting rear material is cooled to room temperature by cooling cylinder, in material after cooling containing part without
The coal dust of burning is handled by gas flow sizing machine and separates coal dust, and titanium ore carries out magnetic separation twice in material, is first sent into magnetic separation
Machine carries out first time magnetic separation under 1000-2000Gs magnetic field strength, obtains titanium-containing magnet mine and tailing, then by tailing in 5000-
Second of magnetic separation is carried out under 8000Gs magnetic field strength, obtains high-quality ilmenite concentrate.
Embodiment 1
A kind of ilmenite low-temperature reduction technique, comprising the following steps:
S1, mixing: under normal temperature conditions, ilmenite and coal dust 5:1 in mass ratio are mixed；
S2, reaction: equably sending material into rotary kiln or tunnel oven after mixing, in the another of rotary kiln or tunnel oven
One end has one to light mouth, by lighting the coal dust of recycling, to being heated to 600 DEG C~620 DEG C in entire rotary kiln or tunnel oven
React 1h；
S3, separation: after reacting rear material is cooled to room temperature by cooling cylinder, in material after cooling not containing part
Coal dust through burning is handled by gas flow sizing machine and separates coal dust, and titanium ore carries out magnetic separation twice in material, is first sent into magnetic
It selects machine to carry out first time magnetic separation under 1000-1200Gs magnetic field strength, obtains titanium-containing magnet mine and tailing, then by tailing in 5000-
Second of magnetic separation is carried out under 5500Gs magnetic field strength, obtains ilmenite concentrate.
Embodiment 2
A kind of ilmenite low-temperature reduction technique, comprising the following steps:
S1, mixing: under normal temperature conditions, ilmenite and coal dust 5:1.2 in mass ratio are mixed；
S2, reaction: equably sending material into rotary kiln or tunnel oven after mixing, in the another of rotary kiln or tunnel oven
One end has one to light mouth, by lighting the coal dust of recycling, in entire rotary kiln or tunnel oven, is heated to 660 DEG C~700 DEG C
React 1h；
S3, separation: after reacting rear material is cooled to room temperature by cooling cylinder, in material after cooling not containing part
Coal dust through burning is handled by gas flow sizing machine and separates coal dust, and titanium ore carries out magnetic separation twice in material, is first sent into magnetic
It selects machine to carry out first time magnetic separation under 1600-2000Gs magnetic field strength, obtains titanium-containing magnet mine and tailing, then by tailing in 7000-
Second of magnetic separation is carried out under 8000Gs magnetic field strength, obtains ilmenite concentrate.
Embodiment 3
A kind of ilmenite low-temperature reduction technique, comprising the following steps:
S1, mixing: under normal temperature conditions, ilmenite and coal dust 5:1 in mass ratio are mixed；
S2, reaction: equably sending material into rotary kiln or tunnel oven after mixing, in the another of rotary kiln or tunnel oven
One end has one to light mouth, by lighting the coal dust of recycling, in entire rotary kiln or tunnel oven, is heated to 630 DEG C~650 DEG C
React 0.5h；
S3, separation: after reacting rear material is cooled to room temperature by cooling cylinder, in material after cooling not containing part
Coal dust through burning is handled by gas flow sizing machine and separates coal dust, and titanium ore carries out magnetic separation twice in material, is first sent into magnetic
It selects machine to carry out first time magnetic separation under 1300-1500Gs magnetic field strength, obtains titanium-containing magnet mine and tailing, then by tailing in 6000-
Second of magnetic separation is carried out under 6500Gs magnetic field strength, obtains ilmenite concentrate.
Comparative example 1
The difference of this comparative example and embodiment 3 is, ilmenite and coal dust 5:0.8 in mass ratio.
Comparative example 2
The difference of this comparative example and embodiment 3 is, is heated to 1000 DEG C of reaction 1h.
Comparative example 3
The difference of this comparative example and embodiment 3 is that the field strength of first time magnetic separation is 2500-3500Gs；Second of magnetic separation
Field strength be 4000-4500Gs.
Examples 1 to 3 and the obtained product of comparative example 1~3 are subjected to attribute test, and carried out pair with traditional preparation methods
Than each component content is as follows in product:
| TiO2 | Fe2O3 | FeO | P | |
| Embodiment 1 | 50.4% | 5.8% | 38.2% | 0.024% |
| Embodiment 2 | 50.8% | 5.6% | 38.4% | 0.024% |
| Embodiment 3 | 51.4% | 5.2% | 38.9% | 0.024% |
| Comparative example 1 | 44.7% | 18.7% | 25.3% | 0.023% |
| Comparative example 2 | 43.2% | 21.5% | 22.6% | 0.025% |
| Comparative example 3 | 45.6% | 16.9% | 27.1% | 0.024% |
| Conventional method | 43.5% | 23.0% | 21.0% | 0.025% |
The above results show that the present invention under middle cryogenic conditions, makees reducing agent using coal dust, utilize rotary kiln or tunnel
Kiln realizes the Fe in ilmenite2O3It is reduced into FeO, significantly improves the solubility of ilmenite, while improving TiO2Main content is made
High-quality ilmenite concentrate reduces the production cost of titanium dioxide, improves the quality of titanium dioxide.The present invention improves under conditions of middle low temperature
The quality index of ilmenite, the product for avoiding conventional high-temperature condition from handling are reoxidized and at high cost, what the present invention was restored
Ilmenite is no longer reoxidized, and has at low cost, stable product quality, and adaptable feature can significantly reduce downstream titanium white
The cost of powder user improves the quality level of entire titanium dioxide industry.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of ilmenite low-temperature reduction technique, it is characterised in that: the following steps are included:
S1, mixing: under normal temperature conditions, ilmenite and coal dust 5:1 in mass ratio~1.2 are mixed；
S2, reaction: sending material into rotary kiln or tunnel oven after mixing, firing coal-dust, is heated to 600 DEG C~700 DEG C reactions
0.5~1h；
S3, separation: after being cooled to room temperature after reaction, material after cooling is handled through gas flow sizing machine, and carries out magnetic separation twice, first
First time magnetic separation is carried out in 1000-2000Gs, obtains titanium-containing magnet mine and tailing, tailing is carried out second then at 5000-8000Gs
Secondary magnetic separation, obtains ilmenite concentrate.
2. a kind of ilmenite low-temperature reduction technique as described in claim 1, it is characterised in that: S1 step, ilmenite and coal dust
The mass ratio pressed is 5:1.
3. a kind of ilmenite low-temperature reduction technique as described in claim 1, it is characterised in that: S2 step, be heated to 630 DEG C~
650℃。
4. a kind of ilmenite low-temperature reduction technique as described in claim 1, it is characterised in that: S3 step, the first time magnetic
The field strength of choosing is 1300-1500Gs；The field strength of second of magnetic separation is 6000-6500Gs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811589287.0A CN109666805A (en) | 2018-12-25 | 2018-12-25 | A kind of ilmenite low-temperature reduction technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811589287.0A CN109666805A (en) | 2018-12-25 | 2018-12-25 | A kind of ilmenite low-temperature reduction technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112410539A (en) * | 2020-10-30 | 2021-02-26 | 河南佰利联新材料有限公司 | Method for sorting titanium middlings containing weak magnetic gangue minerals |
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| CN106521139A (en) * | 2017-01-05 | 2017-03-22 | 重庆大学 | Method for preparing high titanium slag through low temperature reduction and separation of titanium-containing iron ore |
| CN106893856A (en) * | 2017-03-28 | 2017-06-27 | 江苏省冶金设计院有限公司 | Process the method and system of schreyerite |
| CN108212509A (en) * | 2018-01-16 | 2018-06-29 | 东北大学 | Titanium vanadium mineral separation beneficiation method in a kind of hematite-limonite of titaniferous vanadium |
| CN108251635A (en) * | 2018-01-16 | 2018-07-06 | 东北大学 | Titanium vanadium mineral separation beneficiation method in a kind of bloodstone of titaniferous vanadium |
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- 2018-12-25 CN CN201811589287.0A patent/CN109666805A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101758240A (en) * | 2009-12-17 | 2010-06-30 | 李建国 | Method for producing reduced ilmenite powder for welding rod through rotary kiln |
| CN102352433A (en) * | 2011-10-20 | 2012-02-15 | 天津市宏远钛铁有限公司 | Process for producing reduced titanium iron powder by rotary kiln |
| CN102531048A (en) * | 2012-02-22 | 2012-07-04 | 山东东佳集团股份有限公司 | Method for preparing acid-soluble titanium slag by reduction at low temperature |
| CN104651601A (en) * | 2015-02-06 | 2015-05-27 | 天津市宏远钛铁有限公司 | Process for producing reduced ilmenite for welding rod through microwave heating |
| CN106521139A (en) * | 2017-01-05 | 2017-03-22 | 重庆大学 | Method for preparing high titanium slag through low temperature reduction and separation of titanium-containing iron ore |
| CN106893856A (en) * | 2017-03-28 | 2017-06-27 | 江苏省冶金设计院有限公司 | Process the method and system of schreyerite |
| CN108212509A (en) * | 2018-01-16 | 2018-06-29 | 东北大学 | Titanium vanadium mineral separation beneficiation method in a kind of hematite-limonite of titaniferous vanadium |
| CN108251635A (en) * | 2018-01-16 | 2018-07-06 | 东北大学 | Titanium vanadium mineral separation beneficiation method in a kind of bloodstone of titaniferous vanadium |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112410539A (en) * | 2020-10-30 | 2021-02-26 | 河南佰利联新材料有限公司 | Method for sorting titanium middlings containing weak magnetic gangue minerals |
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