CN105506209A - Method for producing granular iron via direct reduction of high-phosphorus oolitic hematite by utilizing rotary hearth furnace - Google Patents
Method for producing granular iron via direct reduction of high-phosphorus oolitic hematite by utilizing rotary hearth furnace Download PDFInfo
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- CN105506209A CN105506209A CN201510983139.7A CN201510983139A CN105506209A CN 105506209 A CN105506209 A CN 105506209A CN 201510983139 A CN201510983139 A CN 201510983139A CN 105506209 A CN105506209 A CN 105506209A
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- hearth furnace
- rotary hearth
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of iron smelting and particularly relates to a method for producing granular iron via direct reduction of high-phosphorus oolitic hematite by utilizing a rotary hearth furnace. The method comprises the following steps: (1) mixing raw materials, namely mixing hematite concentrate powder, reducing coal and a dephosphorizing agent in proportion; (2) pelleting and drying, namely pelleting the raw materials mixed in the step (1) into pellets and subsequently drying; (3) performing a reduction reaction, namely putting the dried pellets in the rotary hearth furnace and heating the rotary hearth furnace so that the pellets in the rotary hearth furnace can have a complete reduction reaction; (4) cooling and crushing, namely cooling the reduced iron pellets and then crushing the reduced iron pellets after the reduction reaction is ended; (5) sieving and magnetically separating, namely sieving the crushed particles and then magnetically separating the particles, putting the granular iron into a finished granular iron product storehouse, and putting the rest parts into a waste residue storehouse. The method disclosed by the invention is simple in technique, compact in process, high in production efficiency, energy-saving and environment-friendly.
Description
Technical field
The invention belongs to ironmaking technology field, particularly a kind of method utilizing rotary hearth furnace direct-reduction high-phosphor oolitic hematite to produce granulated iron.
Background technology
Within 2012, China's iron ore imports total amount is about 700,000,000 tons, and import volume accounts for more than 60% of total demand, for ensureing the supply security of China's iron ore, must strengthen the utilization to existing refractory iron ore resource.High-phosphor oolitic hematite is huge at reserves in China, accounts for about 11% of iron ore deposit, is mainly distributed in the Yangtze valley of China, has now verified and reserves at a specified future date reach over ten billion ton, have very important strategic importance to the research in this ore deposit.
High-phosphor oolitic hematite disseminated grain size is superfine, and often with spathic iron ore, chamosite and phosphorus ore containing symbiosis or mutually wrap up, is one of iron ore type of the most difficult generally acknowledged both at home and abroad at present choosing.Much research shows, with direct-reduction-magnetic separation process process oolitic hematite, its thing phase can be changed, ferric oxide is changed into can low intensity magnetic separation be separated magnetite or metallic iron, effect ground improves the Iron grade of concentrate, and change the olitie texture of microfine into granularity thick granular texture, create conditions for falling phosphorus.
The technical process of rotary hearth furnace direct-reduction process is short, and produce flexibly, it is feasible that this art breading high-phosphor oolitic hematite produces granulated iron.Direct-reduction technique has gas base and coal-based two kinds, and due to China's natural gas shortage of resources, coal-based DR process is that process rhombohedral iron ore is better selected.In prior art, multiplex tunnel furnace process high-phosphor oolitic hematite, although technical indicator is better, owing to yielding poorly, energy consumption is high, seriously polluted, do not meet the developing direction of industry.
Summary of the invention
The object of this invention is to provide a kind of method utilizing rotary hearth furnace process high-phosphor oolitic hematite to produce granulated iron.
To achieve these goals, the invention provides following technical scheme:
The invention provides a kind of method utilizing rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce granulated iron, comprise the steps:
(1) batching mixing: hematite concentrates powder, reduction coal dust and dephosphorizing agent are mixed in proportion;
(2) pressure ball is dry: the raw material that step (1) mixes is pressed into pelletizing; Then dry;
(3) reduction reaction: dried pelletizing is positioned in rotary hearth furnace, heating rotary hearth furnace, makes the pelletizing in rotary hearth furnace fully carry out reduction reaction;
(4) cooling is broken: carry out fragmentation after completing the cooling of the reduced iron pelletizing after reduction reaction;
(5) magnetic separation is sieved: by the pellet through sieves after fragmentation, then carry out magnetic separation, granulated iron enters finished product granulated iron storehouse, and all the other enter refuse bin.
Hematite concentrates powder in described step (1) is high-phosphor oolitic hematite, and content is 70% ~ 80%, and its granularity is-200 orders.
The ratio of the hematite concentrates powder in described step (1), reduction coal dust, dephosphorizing agent is 70% ~ 80%:10% ~ 25%:10% ~ 15%.
In described step (2), the raw material mixed is respectively through after baler precompressed, and high-pressure ball press is finally pressed into pelletizing.
The line pressure of baler is than being 3t/cm, and the line pressure of high-pressure ball press is than being 5t/cm.
In described step (3), the reduction temperature in rotary hearth furnace is 1100 DEG C-1350 DEG C, and the recovery time is 30 ~ 60 minutes.
In described step (4), complete the reduced iron pelletizing after reduction reaction and drain into shaft cooler, high temperature pelletizing is cooled to 150 ~ 250 DEG C by nitrogen in shaft cooler; Then deliver to crusher by chain mat machine, carry out fragmentation.
Compared with prior art, beneficial effect of the present invention is:
The present invention utilizes the high temperature reduction process of rotary hearth furnace, is reduced by the iron in high-phosphor oolitic hematite, after shaft cooler cooling, utilizes brilliant different with the gangue coefficient of expansion of iron, the combination of the two is loosened, then makes iron monomer dissociation through fragmentation.Harmful element phosphorus carried out consolidation by adding dephosphorizing agent and is separated, not only reducing the harmful element in finished product, and ensure that in production process the impact of environment is reach the required standards.Whole technological process eliminates sintering in traditional iron-smelting process and coking, and without coke, required fuel and power all from non-ferric coking coal, can realize substituting to the rare energy in steel smelting procedure.Present invention process is simple, and flow process is compact, and production efficiency is high, energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is that the present invention utilizes rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce the method process flow sheet of granulated iron.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
The present invention utilizes rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce the method for granulated iron, comprises the steps:
(1) batching mixing
Hematite concentrates powder and reduction coal, unslaked lime, binding agent are joined proportioning room by a certain percentage.Wherein the ratio of hematite concentrates powder, reduction coal dust, dephosphorizing agent is 70% ~ 80%:10% ~ 25%:10% ~ 15%.
Described hematite concentrates powder is the hematite concentrates powder of content 70% ~ 80%, and its granularity is-200 orders.
The raw material prepared to high hopper, enters mixer after weighing by Belt Conveying, is transported to the blending bun in pressure ball workshop after raw material mixes in mixing pan through conveyor drive.
(2) pressure ball is dry
The raw material that mixed grind is good is transported to preformer pressure ball by conveyor drive, then enters ball press.Connect conveyor drive below blending bun, transferring raw material is after baler precompressed, and high-pressure ball press finally suppresses balling-up.Wherein the line pressure of preformer is than being 3t/cm, and the line pressure of high-pressure ball press is than being 5t/cm.The balling-up pressed is delivered to round roller via conveyor drive and sieves.Undersize material after screening is directly delivered to dryer.After large ball warp belt transport on sieve, discaling roll fragmentation, return pressure ball workshop pressure ball.
(3) reduction reaction
Be positioned in rotary hearth furnace by dried pelletizing, heating rotary hearth furnace, be warming up to 1400 DEG C, the reduction temperature in rotary hearth furnace is 1100 DEG C-1350 DEG C, and the recovery time is 40 minutes, make the pelletizing in rotary hearth furnace fully carry out reduction reaction.The reduced iron of high temperature 80%-95% is directly discharged from rotary hearth furnace.
Reduction rotary hearth furnace, the highest 1400 DEG C for carbonaceous pelletizing is heated to, produce granulated iron.Stove is side heating, point six temperature-controlled areas.Object is by regulating each section of fuel and warm air supply, utilizes heat energy and reducing atmosphere to ensure heating and reduction requirement to greatest extent.Technological process in stove is: the furnace charges such as pelletizing to load after in stove along with siege advances from loading area, be first heated to more than 1000 DEG C in heating zone, then enter the reduction zone that temperature is higher.Burning and react the gas that generates along in the reverse direction inflow exhaust gas system of advancing with siege.The pelletizings be reduced etc. are discharged to outside stove by discharger after cooling a little in stove.In rotary hearth furnace process, the carbon in the furnace charges such as carbonaceous pelletizing is main fuel, and the CO that the fugitive constituent produced after its heating and reducing iron oxides etc. produce is primary reducing agent, and outside burner heating fuel is slave part, only accounts for about 15% of institute's energy requirement.Therefore, carbon in the furnace charges such as carbonaceous pelletizing utilizes very abundant, and this technique had not only been conducive to energy-conservation but also had been conducive to the discharge of decreasing pollution thing.
Furnace interior at the bottom of carbonaceous pelletizing transfer is heated to the highest 1400 DEG C.Stove is side heating, can arrange multiple temperature-controlled area.Object is by regulating each section of fuel and warm air supply, utilizes heat energy and reducing atmosphere to ensure heating and reduction requirement to greatest extent.
(4) cooling is broken
Complete the reduced iron pelletizing after reduction reaction and drain into shaft cooler by discharging machine.Be cooled to about 200 DEG C by nitrogen in shaft cooler in high temperature pelletizing, deliver to crushing and screening workshop by chain mat machine.Nitrogen, as protective atmosphere, can prevent high temperature reduction iron ball from rolling into a ball secondary oxidation, and cooled nitrogen temperature reaches rising, can again heat exchange use.Carry the pelletizing of coming directly to enter crusher by chain mat machine, carry out fragmentation.
(5) magnetic separation is sieved
Sieve the material after fragmentation, screen underflow granulated iron after magnetic separator magnetic separation enters finished product granulated iron storehouse, and all the other enter secondary breaking;
Material after secondary breaking enters regrading, and it is again broken that screen overflow returns recursher, and screen underflow granulated iron after magnetic separator magnetic separation enters finished product granulated iron storehouse, and all the other enter refuse bin.
Reducting pellet in finished product iron powder storehouse, carries out hot wafering under briquetting press high temperature, produces last briquetting iron product.Briquetting iron product is of a size of 90mm × 60mm × 30mm.
Adopt the inventive method, often producing 1 ton of granulated iron needs rhombohedral iron ore 2.1 tons, power consumption 270 degree, water consumption 1.5 tons.
Claims (7)
1. utilize rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce a method for granulated iron, it is characterized in that: the method comprises the steps:
(1) batching mixing: hematite concentrates powder, reduction coal dust and dephosphorizing agent are mixed in proportion;
(2) pressure ball is dry: the raw material that step (1) mixes is pressed into pelletizing; Then dry;
(3) reduction reaction: dried pelletizing is positioned in rotary hearth furnace, heating rotary hearth furnace, makes the pelletizing in rotary hearth furnace fully carry out reduction reaction;
(4) cooling is broken: carry out fragmentation after completing the cooling of the reduced iron pelletizing after reduction reaction;
(5) magnetic separation is sieved: by the pellet through sieves after fragmentation, then carry out magnetic separation, granulated iron enters finished product granulated iron storehouse, and all the other enter refuse bin.
2. the method utilizing rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce granulated iron according to claim 1, it is characterized in that: the hematite concentrates powder in described step (1) is high-phosphor oolitic hematite, content is 70% ~ 80%, and its granularity is-200 orders.
3. the method utilizing rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce granulated iron according to claim 1, is characterized in that: the ratio of the hematite concentrates powder in described step (1), reduction coal dust, dephosphorizing agent is 70% ~ 80%:10% ~ 25%:10% ~ 15%.
4. the method utilizing rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce granulated iron according to claim 1, it is characterized in that: in described step (2), the raw material mixed is respectively through after baler precompressed, and high-pressure ball press is finally pressed into pelletizing.
5. the method utilizing rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce granulated iron according to claim 4, is characterized in that: the line pressure of baler is than being 3t/cm, and the line pressure of high-pressure ball press is than being 5t/cm.
6. the method utilizing rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce granulated iron according to claim 1, it is characterized in that: in described step (3), reduction temperature in rotary hearth furnace is 1100 DEG C-1350 DEG C, and the recovery time is 30 ~ 60 minutes.
7. the method utilizing rotary hearth furnace direct-reduction process high-phosphor oolitic hematite to produce granulated iron according to claim 1, it is characterized in that: in described step (4), complete the reduced iron pelletizing after reduction reaction and drain into shaft cooler, high temperature pelletizing is cooled to 150 ~ 250 DEG C by nitrogen in shaft cooler; Then deliver to crusher by chain mat machine, carry out fragmentation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510983139.7A CN105506209A (en) | 2015-12-24 | 2015-12-24 | Method for producing granular iron via direct reduction of high-phosphorus oolitic hematite by utilizing rotary hearth furnace |
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| CN201510983139.7A CN105506209A (en) | 2015-12-24 | 2015-12-24 | Method for producing granular iron via direct reduction of high-phosphorus oolitic hematite by utilizing rotary hearth furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906327A (en) * | 2017-03-24 | 2017-06-30 | 贵州大学 | A kind of method that high-phosphor oolitic hematite efficiently carries iron |
| CN111074033A (en) * | 2020-01-21 | 2020-04-28 | 钢铁研究总院 | Method for directly reducing materials by using rotary hearth furnace |
| CN114247563A (en) * | 2021-11-20 | 2022-03-29 | 酒泉钢铁(集团)有限责任公司 | Method for separating carbon residue from iron ore direct reduction material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162018A (en) * | 2011-05-26 | 2011-08-24 | 吴道洪 | Iron making method by rotary hearth furnace direct reduction-grinding and separation treatment of high-phosphorus oolitic hematite |
| CN102230047A (en) * | 2011-07-19 | 2011-11-02 | 吴道洪 | Iron-making method for producing granular iron by smelting reduction of high-phosphorus oolitic low-grade hematite in rotary hearth furnace |
| CN102634621A (en) * | 2012-04-09 | 2012-08-15 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
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2015
- 2015-12-24 CN CN201510983139.7A patent/CN105506209A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162018A (en) * | 2011-05-26 | 2011-08-24 | 吴道洪 | Iron making method by rotary hearth furnace direct reduction-grinding and separation treatment of high-phosphorus oolitic hematite |
| CN102230047A (en) * | 2011-07-19 | 2011-11-02 | 吴道洪 | Iron-making method for producing granular iron by smelting reduction of high-phosphorus oolitic low-grade hematite in rotary hearth furnace |
| CN102634621A (en) * | 2012-04-09 | 2012-08-15 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906327A (en) * | 2017-03-24 | 2017-06-30 | 贵州大学 | A kind of method that high-phosphor oolitic hematite efficiently carries iron |
| CN111074033A (en) * | 2020-01-21 | 2020-04-28 | 钢铁研究总院 | Method for directly reducing materials by using rotary hearth furnace |
| CN114247563A (en) * | 2021-11-20 | 2022-03-29 | 酒泉钢铁(集团)有限责任公司 | Method for separating carbon residue from iron ore direct reduction material |
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Application publication date: 20160420 |