CN105925745A - Rotary hearth furnace direct reduction efficiency intensifying method by using machinery mixing-grinding device - Google Patents
Rotary hearth furnace direct reduction efficiency intensifying method by using machinery mixing-grinding device Download PDFInfo
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- CN105925745A CN105925745A CN201610464949.6A CN201610464949A CN105925745A CN 105925745 A CN105925745 A CN 105925745A CN 201610464949 A CN201610464949 A CN 201610464949A CN 105925745 A CN105925745 A CN 105925745A
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- reduction
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- hearth furnace
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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
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture Of Iron (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a rotary hearth furnace direct reduction efficiency intensifying method by using a machinery mixing-grinding device and belongs to the field of ferrous metallurgy direct reduction. The rotary hearth furnace direct reduction efficiency intensifying method by using the machinery mixing-grinding device is characterized in that a machinery mixing-grinding method is introduced into a rotary hearth furnace coal base direct reduction technology, and the physical and chemical properties of raw materials is changed by the machinery excitation on the premise of not hindering the original production process, and the goals of improving the strength of a fresh pellet, the reduction rate, the terminal point reduction degree and the strength of a metallized pellet and lowering the reduction starting temperature can be achieved. According to the method, the problems that in the original rotary hearth furnace coal base direct reduction technology, the temperature and the energy consumption are high, the reduction time is long, the metallization ratio and the production efficiency are low can be effectively overcome. The method has better society effect, economy effect and application prospect.
Description
Technical field
The invention belongs to Ferrous Metallurgy direct-reduction field, be specifically related to a kind of by machinery mix grinding device strengthening
The method of rotary hearth furnace direct-reduction efficiency.
Background technology
First production-scale coal-based direct reduction rotary hearth furnace built up in 1978, and main equipment comes from steel rolling
Rotary heating furnace, initial purpose is for processing iron and steel enterprise's iron-containing waste, but have soon the U.S.,
The state such as German, Japanese is transferred exploitation and is applied to the direct-reduction of iron ore.Rotary hearth furnace is because having annular furnace
Gain the name with rotating furnace bottom, the carbonaceous pelletizing that its raw material mainly Iron Ore Powder and coal dust are made, through dispensing,
Batch mixing, ball processed and dried add in rotary hearth furnace, fire box temperature up to about 1250～1350 DEG C, carbonaceous pelletizing
Being heated during rotating along with furnace bottom, iron mine, by interior carbon fast restore of joining, generates metallized pellet, rotation
Discharged out of the furnace by spiral discharging machine after circling.
Compared with Midrex method, HYL method, caol based DR process etc., rotary hearth furnace coal-based DR process
Superiority shows: the motility of raw material and the energy is big, equipment and capital expenditure is relatively low, equipment runs steady
Fixed, simple to operate, plant site selection flexibly, be conducive to the aspects such as environmental conservation.But this technique also has some not
In place of foot, this is to be limited by the feature of technique itself.Rotary hearth furnace passes through burner combustion heated by gas body of heater, heat
Amount is radiated to pelletizing by furnace roof fire resisting material and is heated, and compared with the gas-solid heat exchange that blast furnace is good, turns the end
The thermal efficiency of stove is the lowest, and meanwhile, high-temperature flue gas is directly entered flue from burner hearth, causes heat losses, typically recognizes
For, rotary hearth furnace flue gas has been taken away burner hearth and has been fully entered more than the 50% of heat, ultimately results in production process energy consumption relatively
High.Additionally, rotary hearth furnace burner hearth is high, the bed of material is thin, the utilization rate of equipment is low, and production efficiency is the most relatively low.Energy
Consumption and formation efficiency are that restriction rotary hearth furnace plays usefulness and the key problem of rotary hearth furnace process development.Reality was applied
Also finding in journey, after rotary hearth furnace reduction, gained metallized pellet degree of metalization is relatively low, and intensity is poor, the most right
In difficult reducing iron ore (such as vanadium titano-magnetite), reduction effect is not ideal enough.
Accordingly, it would be desirable to carbonaceous pelletizing rate of reduction (the most correspondingly can carry in exploitation one can improve rotary hearth furnace
High efficiency also reduces energy consumption of unit product) and the method for degree of metalization, to realize rotary hearth furnace coal base directly also
The sustainable development of former technique.
The China of invention entitled " method of a kind of magnetic field-intensification iron content powder carbon-burdened pellet direct-reduction "
Patent (application number: CN201410705801.8), joins carbon ball in disclosing one magnetic field-intensification iron content powder
The method of group's direct-reduction, for Baiyunebo iron ores, C/O=1.2, carbonaceous pelletizing is in 0.97T constant magnetic field
Middle reduction, reducing condition is 950 DEG C, 40min, and with ratio compared with magnetic field, degree of metalization brings up to from 17%
86%.But, field generator for magnetic is applied to the large high-temperature equipment of industrial product, how how by this invention
Avoid magnetic field that the aspects such as the impact of environment and operator are also had more uncertain factor.
Chinese patent (the Shen of invention entitled " using the preparation method that low-temperature reduction Iron Ore Powder produces iron product "
Please number: CN200410000815.6), disclose a kind of by iron ore concentrate, coal and the catalyst added, de-
Sulfur agent adds binding agent and carries out mixed pelletizing and carry out the side of low-temperature reduction again after carrying out broken processing in ball mill
Method.The method uses the preprocess method of single ore grinding, the most first by iron ore concentrate, coal, catalyst, de-
Carry out mixed pelletizing again after sulfur agent etc. are the most levigate, do not mention feature and the advantage of raw material mixing ore grinding, and
And the method needs the alkali metal adding 0.1～5% to make catalyst, not only increasing production cost also can be by
Environmental pollution is caused in alkali metal volatilization.
Summary of the invention
The present invention is directed to temperature height, energy consumption height, recovery time length, metal in rotary hearth furnace coal-based DR process
The problems such as rate is on the low side, production efficiency is low, it is therefore intended that find a kind of technically feasible, reasonable in economy, letter
Single efficient method strengthening rotary hearth furnace coal-based direct reduction efficiency.
The method is the preprocess method of a kind of raw material, before pelletizing, by Iron Ore Powder, reducing agent, binding agent
Prepare by predetermined ratio, send in ore grinding device after moisture adjustment, mixing and carry out mix grinding, utilize mechanical force
Learn action principle, strengthen Direct Reduction, reach improve green ball strength, reduce reduction start temperature,
Improve rate of reduction, improve terminal reduction degree, the purpose of raising metallized pellet intensity.
Mechanical force and chemical be relevant utilize compress, shear, rub, extend, impact, the means such as bending are to cohesion
State material applies mechanical energy and induces the chemistry subject that their physicochemical properties change.Use the earliest
There is in synthesis the composition metal powder body of hyperfine structure, be applied to the most again the preparation of inorganic powder materials.?
In the metallurgical technologies such as ore dressing, wet-leaching, pyrometallurgical smelting, mechanical activation can improve reaction rate, reduce instead
Answer difficulty, make said process be strengthened.In machinery grinding process, powder granule by continuous extrusion, broken,
Particle size constantly reduces, and contact surface increases, and the contact between granule fresh surface increases the most accordingly, reduces anti-
Answer the temperature that thing occurs through the diffusion difficulty of product layer and reaction.Additionally, a large amount of defects that grinding process produces
Diffusion process can be accelerated.
Compared with single ore grinding, the advantage of present invention maximum is: carry out after using Iron Ore Powder and coal dust mixing again
Mixing ore grinding, and the pelletizing processed by the method carries out adding thermal reduction in rotary hearth furnace, it is therefore intended that optimize existing
Some rotary hearth furnace coal-based DR process.Compared with Iron Ore Powder and coal dust mix grinding remix with single ore grinding: due to
Coal dust matter is soft, serves grind-aiding effect for Iron Ore Powder so that Iron Ore Powder is more easy to grind, and reduces mill
The energy consumption of ore deposit process, and improve the efficiency of ore grinding；The breeze of mix grinding gained and coal powder size are thinner, and the two mixes
Close evenly so that the contact area between breeze and coal dust increases further, advantageously in playing carbon containing ball
The advantage that group's iron oxides and reducing agent are in close contact；Breeze and coal dust in intergrinding process the two interface
Through there is a certain degree of reaction, store certain mechanical energy.Finally, reduction test result shows, ore grinding
When time is identical, under identical reducing condition, mixing ore grinding than single ore grinding carbonaceous pelletizing degree of metalization more
High.This method is more suitable for the efficient reduction under rotary hearth furnace coal-based DR process of the difficult reducing iron ore.
More than Zong He, the concrete production process of the present invention is:
(1) Iron Ore Powder, carbonaceous reducing agent and binding agent are prepared by predetermined ratio, wherein the joining of reducing agent
Enter 15～25%, the amount of allocating into is iron mine amount the 1～3% of binding agent that amount is iron mine amount, the total moisture of compound
Control 5～10%, the compound prepared is loaded after mixing the mix grinding carrying out certain time in grinding machine；
(2) compound of milled makes carbonaceous pelletizing through balling equipment, and after pelletizing drying, single layer cloth is turning the end
On the bottom refractory of stove, carbonaceous pelletizing heated reduction in rotary hearth furnace prepares metallized pellet.
Iron Ore Powder used can be the compound of low-grade common iron mine, the common iron mine of high-grade and more difficult reduction
Iron mine, carbonaceous reducing agent used is the one in anthracite, bituminous coal, brown coal, petroleum coke, semicoke and coke powder
Or the granularity 100% of several mixing, Iron Ore Powder and reducing agent is less than 1mm.Binding agent used be bentonite,
The mixing of one or more in molasses, Semen Glycines powder, dextrin.Grinding attachment used be damp mill, ball mill,
Rod mill, the ore grinding time is 5～20 minutes.Reduction apparatus used is circular rotary hearth furnace, and reduction temperature is
900～1200 DEG C, the recovery time is 20～40 minutes.
Have the advantage that compared with existing rotary hearth furnace Coal-based Direct Reduction Technologies:
The present invention does not affect original rotary hearth furnace process flow process, simple to operate, and technical maturity is workable.Logical
Cross introducing mix grinding technique, the direct-reduction temperature of rotary hearth furnace can be reduced by 100 DEG C and do not affect reduction effect, with
Time can also improve green ball strength, reduce binding agent proportioning, reduce production cost.Thus effectively overcome original turn
Temperature height, energy consumption height, recovery time length in end stove coal-based DR process, degree of metalization is on the low side, produce effect
The problems such as rate is low, have preferable Social and economic benef@and application prospect.
Accompanying drawing explanation
Fig. 1 is the principle process of present invention process
Detailed description of the invention
Embodiment 1
By Iron Ore Powder, weight be the anchracite duff of Iron Ore Powder weight 20%, weight be iron mine and coal dust weight summation
The binding agent of 2% mixes through Belt Conveying to batch mixer, and regulates mixing material moisture to 7%.By mix
Mixing material is delivered to roll-in ball mechanism is become carbonaceous pelletizing through belt, and pressure is 15MPa, and pelletizing is a size of
40 × 30 × 20mm pillow ellipsoid.Green-ball single berth after drying is on the magnesia refractories of rotary hearth furnace.Turn the end
Reduction temperature in stove is 1100 DEG C, and the recovery time is 30 minutes, and degree of metalization reaches about 89.6%, so
After discharged by spiral discharging machine, obtain metallized pellet after cooling.Iron Ore Powder composition, coal dust composition are the most such as
Shown in table 1, table 2.
Table 1 Iron Ore Powder chemical composition/%
Table 2 anchracite duff main component/%
Embodiment 2
By Iron Ore Powder, weight be the coal dust of Iron Ore Powder weight 20%, weight be iron mine and coal dust weight summation 1%
Binding agent through Belt Conveying to batch mixer mix, and regulate mixing material moisture to 10%.Mixed by mix
Refining is delivered to mixer-mill mix grinding 10min through belt, and the material warp after mix grinding becomes carbonaceous pelletizing to roll-in ball mechanism,
Pressure is 15MPa, pelletizing a size of 40 × 30 × 20mm pillow ellipsoid.Green-ball single berth after drying is turning
On the magnesia refractories of end stove.Reduction temperature in rotary hearth furnace is 1000 DEG C, and the recovery time is 30 minutes,
Degree of metalization reaches about 86.6%, is then discharged by spiral discharging machine, obtains metallized pellet after cooling.
Iron Ore Powder composition, coal dust composition are respectively as shown in table 1, table 2.
Embodiment 3
By reducing agent that Iron Ore Powder, weight are Iron Ore Powder weight 20% (wherein the carbon atom of 60% is provided by coal dust,
The carbon atom of 40% is provided by the good semicoke of reactivity), weight be iron mine and the bonding of reducing agent weight summation 1%
Agent mixes through Belt Conveying to batch mixer, and regulates mixing material moisture to 10%.The mixing material warp that will mix
Belt Conveying is to mixer-mill mix grinding 10min, and the material after mix grinding is through becoming carbonaceous pelletizing, pressure to roll-in ball mechanism
For 15MPa, pelletizing a size of 40 × 30 × 20mm pillow ellipsoid.Green-ball single berth after drying is at rotary hearth furnace
Magnesia refractories on.Reduction temperature in rotary hearth furnace is 1000 DEG C, and the recovery time is 30 minutes, metal
Rate reaches about 90.1%, is then discharged by spiral discharging machine, obtains metallized pellet after cooling.Iron mine
Meal component, coal dust composition are respectively as shown in table 1, table 2, and semicoke composition is as shown in table 3.
Table 3 semicoke main component/%
Claims (4)
1. the method by machinery mix grinding device strengthening rotary hearth furnace direct-reduction efficiency, it is characterised in that by machinery
Mix grinding method introduces in rotary hearth furnace coal-based DR process, on the premise of not hindering original product process, and profit
With the physical and chemical performance of mechanical activation feed change, reach to improve green ball strength, reduce reduction start temperature,
Improve rate of reduction, improve terminal reduction degree, the purpose of raising metallized pellet intensity, main production stream
Cheng Wei:
(1) Iron Ore Powder, carbonaceous reducing agent and binding agent are prepared by predetermined ratio, wherein the joining of reducing agent
Enter 15～25%, the amount of allocating into is iron mine amount the 1～3% of binding agent that amount is iron mine amount, the total moisture of compound
Control 5～10%, the compound prepared is loaded after mixing the mix grinding carrying out certain time in grinding machine；
(2) compound of milled makes carbonaceous pelletizing through balling equipment, and after pelletizing drying, single layer cloth is turning the end
On the bottom refractory of stove, carbonaceous pelletizing heated reduction in rotary hearth furnace prepares metallized pellet.
A kind of method by machinery mix grinding device strengthening rotary hearth furnace direct-reduction efficiency,
It is characterized in that: Iron Ore Powder used is low-grade common iron mine, the common iron mine of high-grade and more difficult reduction
Complex iron ore, carbonaceous reducing agent used is anthracite, bituminous coal, brown coal, petroleum coke, semicoke or coke powder, ferrum
The granularity 100% of breeze and reducing agent is less than 1mm.
A kind of method by machinery mix grinding device strengthening rotary hearth furnace direct-reduction efficiency,
It is characterized in that: mix grinding equipment used is damp mill, ball mill, rod mill.
A kind of method by machinery mix grinding device strengthening rotary hearth furnace direct-reduction efficiency,
It is characterized in that: reduction apparatus used is circular rotary hearth furnace, and reduction temperature is 900～1200 DEG C, during reduction
Between be 20～40 minutes, the degree of metalization of pelletizing reaches 80～90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610464949.6A CN105925745A (en) | 2016-06-23 | 2016-06-23 | Rotary hearth furnace direct reduction efficiency intensifying method by using machinery mixing-grinding device |
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| CN201610464949.6A CN105925745A (en) | 2016-06-23 | 2016-06-23 | Rotary hearth furnace direct reduction efficiency intensifying method by using machinery mixing-grinding device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636520A (en) * | 2016-12-06 | 2017-05-10 | 江苏省冶金设计院有限公司 | System and method for preparing metallized pellet |
| CN113981164A (en) * | 2021-10-25 | 2022-01-28 | 山东大学 | Process and system for co-mechanical activation of iron ore-carbon material in reducing atmosphere |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101063181A (en) * | 2007-06-05 | 2007-10-31 | 昆明贵金属研究所 | Rapid reduction of carbonaceous gold-containing iron ore firing residue pellet gold enrichment by using rotary hearth furnace and method for coproduction of iron powder |
| 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 |
| CN102642027A (en) * | 2012-04-11 | 2012-08-22 | 莱芜钢铁集团有限公司 | Process for producing reduced iron powder |
-
2016
- 2016-06-23 CN CN201610464949.6A patent/CN105925745A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101063181A (en) * | 2007-06-05 | 2007-10-31 | 昆明贵金属研究所 | Rapid reduction of carbonaceous gold-containing iron ore firing residue pellet gold enrichment by using rotary hearth furnace and method for coproduction of iron powder |
| 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 |
| CN102642027A (en) * | 2012-04-11 | 2012-08-22 | 莱芜钢铁集团有限公司 | Process for producing reduced iron powder |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636520A (en) * | 2016-12-06 | 2017-05-10 | 江苏省冶金设计院有限公司 | System and method for preparing metallized pellet |
| CN113981164A (en) * | 2021-10-25 | 2022-01-28 | 山东大学 | Process and system for co-mechanical activation of iron ore-carbon material in reducing atmosphere |
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Application publication date: 20160907 |
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