CN105463146A - Method for carrying out direct reduction processing on hematite through rotary hearth furnace to produce granular iron - Google Patents
Method for carrying out direct reduction processing on hematite through rotary hearth furnace to produce granular iron Download PDFInfo
- Publication number
- CN105463146A CN105463146A CN201510982818.2A CN201510982818A CN105463146A CN 105463146 A CN105463146 A CN 105463146A CN 201510982818 A CN201510982818 A CN 201510982818A CN 105463146 A CN105463146 A CN 105463146A
- Authority
- CN
- China
- Prior art keywords
- hearth furnace
- rotary hearth
- reduction
- iron ore
- described step
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of iron making, and particularly relates to a method for carrying out direct reduction processing on hematite through a rotary hearth furnace to produce granular iron. The method includes the steps that (1) materials are mixed, specifically, hematite concentrate fines, reduced pulverized coal, quick lime and binding agents are mixed according to proportions; (2) ball pressing and drying are carried out, specifically, the raw materials mixed in the step (1) are pressed into balls and then dried; (3) a reduction reaction is carried out, specifically, the dried balls are put into the rotary hearth furnace, the rotary hearth furnace is heated, and the balls in the rotary hearth furnace are subjected to the reduction reaction thoroughly; (4) cooling and crushing are carried out, specifically, the balls obtained after the reduction reaction are cooled and then crushed; and (5) screening and magnetic separation are carried out. The method uses a few devices, is low in investment, simple in process, short in process, stable in operation, environmentally friendly and easy to produce in a large scale, and saves energy.
Description
Technical field
The invention belongs to ironmaking technology field, particularly a kind of method utilizing rotary hearth furnace direct-reduction process rhombohedral iron ore to produce granulated iron.
Background technology
Rhombohedral iron ore chemical composition is not fixed, and iron-holder is low, beneficiation enrichment difficulty, and be difficult to use as Iron Ore Matching in Sintering, utilization ratio is very low.Because rhombohedral iron ore iron-holder is very unstable, in large, the comminution process of moisture content change, easy mistake is pulverized, and does not have magnetic, so be difficult to carry out beneficiation enrichment, in ore dressing process, iron loss is large.In addition, rhombohedral iron ore tap density is little, water-absorbent strong, SiO
2content is higher, scaling loss is high.Because China high-quality iron ore deposit is deficient, Refractory iron ore stone utilization ratio is low and domestic iron ore manufacturing enterprise production capacity is not enough, domestic Iron Ore Market is caused to present serious supply falls short of demand state.Therefore, strengthen domestic Refractory iron ore stone Efficient Development research on utilization, improve the iron ore degree of self-sufficiency, there is important strategic importance.
In existing production technology, when producing agglomerate, because density is little, filling ratio is low and crystal water decomposes, can cause that the void content of agglomerate is high, proportion reduces, amount of liquid phase is not enough, rate of burning till is low, affects sintering output; Ore water-absorbent is strong, and the moisture needed in sintering process is comparatively large, require height to ignition quality; SiO in ore deposit
2content is higher, and grade of sinter reduces, and is unfavorable for reducing ironmaking energy consumption; On the other hand, in sintering process, amount of liquid phase mesosilicic acid salt ratio increases, poor fluidity; Sinter bed inner pore is large, and vertical sintering speed is very fast, and between mineral, the time of mineralization and generation liquid phase is short.Shortcomings such as during high mixture ratio rhombohedral iron ore sintering, there is sintering velocity slow, productivity of sinter is low, the low and burnup of agglomerate tissue looseness, yield rate is high.The shortcoming of rhombohedral iron ore SINTERING PRODUCTION, seriously hinders a large amount of utilizations of rhombohedral iron ore, and blast furnace uses rhombohedral iron ore to be a great problem perplexing ironmaking enterprise all the time.
Summary of the invention
The object of this invention is to provide a kind of new iron-smelting process, adopt Coal-based Direct Reduction Technologies, utilize rotary hearth furnace process refractory hematite to produce the method for granulated iron.
To achieve these goals, the invention provides following technical scheme:
A kind of method utilizing rotary hearth furnace direct-reduction process rhombohedral iron ore to produce granulated iron of the present invention, comprises the steps:
(1) batching mixing: hematite concentrates powder and reduction coal dust, unslaked lime, binding 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: by completing the cooling of the pelletizing after reduction reaction, then carry out fragmentation;
(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 the hematite concentrates powder of content 70% ~ 80%, and its granularity is-200 orders.
Binding agent in described step (1) is aluminum oxide powder; The ratio of hematite concentrates powder, reduction coal dust, unslaked lime and aluminum oxide powder is 1000:280:53.2:19.1.
In described step (2), the raw material mixed, respectively through precompressed and high pressure compacting, is finally pressed into pelletizing.
In described step (2), bake out temperature is 200-300 DEG C, residence time 20-40mins.
In described step (3), rotary hearth furnace is warming up to 1300-1500 DEG C, recovery time 30-45mins.
In described step (3), described rotary hearth furnace is divided into multiple for hot arc, adopts side burner to heat.
In described step (4), the temperature completing the pelletizing after reduction reaction is 950-1050 DEG C, adopts water-cooling process to be cooled to 300 DEG C.
In described step (4), the grain graininess after fragmentation is less than 50 orders.
Compared with prior art, beneficial effect of the present invention is:
The present invention adopts Coal-based Direct Reduction Technologies, Coal-based Direct Reduction Technologies is a kind of up-to-date Direct Reduction Technology utilizing iron-containing resource to extract metallic iron and other valuable metal, and take mill coal as primary energy source, fine ore is without the need to high temperature agglomeration, technical process and smelting cycle short, production efficiency is high.Particularly owing to eliminating the maximum coking of pollutant discharge amount in traditional process and sintering circuit, alleviate carrying capacity of environment widely, also further reduce energy consumption and CO simultaneously
2discharge.The inventive method use equipment less, invest low, technique is simple, flow process is short, stable operation, be easy to scale production, has very high practical value.Adopt the present invention, eliminate the sintering in traditional iron-smelting process and coking, and without coke, belong to a kind of non-blast furnace direct reduction iron making.The present invention can reasonable employment natural resources and the energy to greatest extent, is a kind of high-efficiency environment friendly technique utilizing refractory hematite to carry out ironmaking production.
Accompanying drawing explanation
Fig. 1 is that the present invention utilizes rotary hearth furnace direct-reduction process rhombohedral iron ore to produce the method process flow sheet of granulated iron.
Embodiment
The present invention is realized by following technical approach:
Rhombohedral iron ore breeze directly allocates a certain amount of fixed carbon into as reductive agent, and compound is prepared into the pelletizing with some strength, cloth is in rotary hearth furnace equably, after combustion heating, direct reduction reactor is there is in carbon containing ball under high temperature semi-melting state, final formation granulated iron and residue, reach the object of short route direct production granulated iron.
Below in conjunction with embodiment, the present invention is further described.
The present invention utilizes rotary hearth furnace direct-reduction process rhombohedral iron ore to produce the method for granulated iron, comprises the steps:
(1) batching mixing
Hematite concentrates powder and reduction coal dust, unslaked lime, binding agent are joined proportioning room by a certain percentage; Wherein, binding agent is aluminum oxide powder.
The ratio of hematite concentrates powder, reduction coal dust, unslaked lime and aluminum oxide powder is 1000:280:53.2:19.1.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 by Belt Conveying, is entered roller and grinds mixer, mix after weighing.
(2) pressure ball is dry
The raw material that mixed grind is good is transported to preformer pressure ball by conveyor drive, then enters high-pressure ball press, is pressed into pelletizing.
Finished product green-ball after shaping is via the screening of round roller sieve, and on sieve, finished ball delivers to rotary hearth furnace, and undersize material returns intermediate bunker via conveyor drive, re-starts pressure ball.
Pre-pressure ball type pressure roller diameter is φ 1050mm, and maximum line ball is than being 4t/cm, total pressure 200t, throughput 40t/h.
High-pressure ball press total pressure 450t, maximum line ball is than being 9t/cm, throughput 17.5t/h, gross weight of equipment 58.5t.
The pelletizing pressed from ball press enters dryer, carries out drying, bake out temperature 250 DEG C, residence time 20mins.
(3) reduction reaction
Be positioned in rotary hearth furnace by dried pelletizing, heating rotary hearth furnace, is warming up to 1400 DEG C, recovery time 30-45mins, makes the pelletizing in rotary hearth furnace fully carry out reduction reaction.
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.
Flue gas in a furnace with the countercurrent flow of carbonaceous pelletizing direction of motion, thus heat carbonaceous pelletizing, waste gas is discharged by the smoke outlet of furnace roof and is entered interchanger, carries out preheating, can dry after heat exchange to coal dust medium-speed pulverizer combustion gas furnace coal gas and air.
Stove uses calorific value to be 1350kcal/Nm
3producer gas be fuel.Side burner is adopted to heat.Stove is divided into 6 for hot arc, configuration high temperature radioprotective producer gas updraft burner 31; Hot air nozzle is established in addition in 1-5 district.For preventing burner from blocking, establish cleaning eye in burner both sides.
Gas burner of producer is distributed in 6 heating and reduction section, and Bing 1-5 district establishes hot air nozzle.All burners are all furnished with corresponding burner block and burner plate.Each reduction zone burner arranges outer arc 3, inner arc 2.
(4) cooling is broken
Complete the reduced iron pelletizing after reduction reaction and drain into belt-cooling machine by discharge with endless screw device, cool.Material, cooling with in the belt-cooling machine of mounted angle, moves to discharge end by feed end.The reduced iron of temperature about 1000 DEG C, by jet atomization water, is cooled to 300 DEG C by belt-cooling machine.The injection flow rate of cooler nozzle and spray angle, change along with the difference of high-temperature material characteristic, and speed of cooling is fast, and water loss is few, and production cost is low.
Cooled reduced iron pelletizing directly enters crusher, carries 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.
Adopt the inventive method, often producing 1 ton of granulated iron needs rhombohedral iron ore 1.71 tons, power consumption 170 degree, water consumption 1.5 tons, iron cost per ton about about 2000 yuan.
Claims (9)
1. utilize rotary hearth furnace direct-reduction process rhombohedral iron ore to produce a method for granulated iron, it is characterized in that: the method comprises the steps:
(1) batching mixing: hematite concentrates powder and reduction coal dust, unslaked lime, binding 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: by completing the cooling of the pelletizing after reduction reaction, then carry out fragmentation;
(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 rhombohedral iron ore to produce granulated iron according to claim 1, is characterized in that: the hematite concentrates powder in described step (1) is the hematite concentrates powder of content 70% ~ 80%, and its granularity is-200 orders.
3. the method utilizing rotary hearth furnace direct-reduction process rhombohedral iron ore to produce granulated iron according to claim 1, is characterized in that: the binding agent in described step (1) is aluminum oxide powder; The ratio of hematite concentrates powder, reduction coal dust, unslaked lime and aluminum oxide powder is 1000:280:53.2:19.1.
4. the method utilizing rotary hearth furnace direct-reduction process rhombohedral iron ore to produce granulated iron according to claim 1, is characterized in that: in described step (2), and the raw material mixed, respectively through precompressed and high pressure compacting, is finally pressed into pelletizing.
5. the method utilizing rotary hearth furnace direct-reduction process rhombohedral iron ore to produce granulated iron according to claim 1, it is characterized in that: in described step (2), bake out temperature is 200-300 DEG C, residence time 20-40mins.
6. the method utilizing rotary hearth furnace direct-reduction process rhombohedral iron ore to produce granulated iron according to claim 1, is characterized in that: in described step (3), rotary hearth furnace is warming up to 1300-1500 DEG C, recovery time 30-45mins.
7. the method utilizing rotary hearth furnace direct-reduction process rhombohedral iron ore to produce granulated iron according to claim 1, is characterized in that: in described step (3), and described rotary hearth furnace is divided into multiple for hot arc, adopts side burner to heat.
8. the method utilizing rotary hearth furnace direct-reduction process rhombohedral iron ore to produce granulated iron according to claim 1, it is characterized in that: in described step (4), the temperature completing the pelletizing after reduction reaction is 950-1050 DEG C, adopts water-cooling process to be cooled to 300 DEG C.
9. the method utilizing rotary hearth furnace direct-reduction process rhombohedral iron ore to produce granulated iron according to claim 1, is characterized in that: in described step (4), the grain graininess after fragmentation is less than 50 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510982818.2A CN105463146A (en) | 2015-12-24 | 2015-12-24 | Method for carrying out direct reduction processing on hematite through rotary hearth furnace to produce granular iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510982818.2A CN105463146A (en) | 2015-12-24 | 2015-12-24 | Method for carrying out direct reduction processing on hematite through rotary hearth furnace to produce granular iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105463146A true CN105463146A (en) | 2016-04-06 |
Family
ID=55601299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510982818.2A Pending CN105463146A (en) | 2015-12-24 | 2015-12-24 | Method for carrying out direct reduction processing on hematite through rotary hearth furnace to produce granular iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105463146A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111074033A (en) * | 2020-01-21 | 2020-04-28 | 钢铁研究总院 | Method for directly reducing materials by using rotary hearth furnace |
| CN111154972A (en) * | 2020-01-21 | 2020-05-15 | 鞍钢股份有限公司 | Preparation method of spherical granular iron for steelmaking |
| WO2022042621A1 (en) * | 2020-08-26 | 2022-03-03 | 宝山钢铁股份有限公司 | Method for manufacturing ultra-thin hot-rolled strip steel |
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 |
-
2015
- 2015-12-24 CN CN201510982818.2A patent/CN105463146A/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 |
|---|---|---|---|---|
| CN111074033A (en) * | 2020-01-21 | 2020-04-28 | 钢铁研究总院 | Method for directly reducing materials by using rotary hearth furnace |
| CN111154972A (en) * | 2020-01-21 | 2020-05-15 | 鞍钢股份有限公司 | Preparation method of spherical granular iron for steelmaking |
| WO2022042621A1 (en) * | 2020-08-26 | 2022-03-03 | 宝山钢铁股份有限公司 | Method for manufacturing ultra-thin hot-rolled strip steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103708455B (en) | The method preparing carbide | |
| CN102634621A (en) | Device and method for treating refractory iron ore | |
| CN103667675A (en) | Treatment method of laterite-nickel ore | |
| CN100500887C (en) | Concentration method for iron and boron in low-grade paigeite | |
| CN105087907B (en) | A kind of ferrochrome powder mine sintering technique | |
| CN104263911B (en) | The preparation method of sintering ore of vanadium-titanium magnetite ore | |
| CN108130105B (en) | Metallurgical reduction coupling type coking and carbonization co-terminal coal pyrolysis process and system | |
| CN103114201A (en) | Agglomeration method for iron containing dust slime of iron and steel plants | |
| CN105219907A (en) | The iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection | |
| CN101649390A (en) | Method for ultra-fine refined flour sintering for large-scale sintering machine | |
| CN103882224B (en) | A kind of manifold type sintering method of low-grade laterite nickel ore | |
| CN104004905B (en) | A kind of blast furnace ironmaking prereduced burden production technique | |
| CN101967570A (en) | Method for producing ferro-nickel alloy from red soil nickel ore | |
| CN101967571A (en) | Method for using red-soil nickel ore to produce nickel-iron alloy in tunnel kiln-electric furnace | |
| CN105463146A (en) | Method for carrying out direct reduction processing on hematite through rotary hearth furnace to produce granular iron | |
| CN103602772B (en) | Method for producing iron by directly reducing brown iron ore or hematite by means of waste plastic | |
| CN105506209A (en) | Method for producing granular iron via direct reduction of high-phosphorus oolitic hematite by utilizing rotary hearth furnace | |
| CN112899471B (en) | Method for preparing large-size composite vanadium-titanium pellet ore | |
| WO2021239096A1 (en) | Preparation method for carbon-iron composite furnace burden | |
| CN103589865B (en) | Method for producing metallized pellets by direct reduction of powdered iron by carbon cycle oxygenation | |
| CN205062100U (en) | Iron -smelting system of high phosphorus oolitic hematite gas base direct reduction - ore grinding magnetic separation | |
| CN107739819A (en) | A kind of method of coal base shaft furnace process processing iron content red mud | |
| CN105200228B (en) | A kind of processing method of DRI pelletizings | |
| JPH05263155A (en) | Production of sintered or pelletized ore as blast-furnace material using lime cake | |
| CN112708754A (en) | Carbon-free sintering method and system for iron ore powder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160406 |