CN105219907A - The iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection - Google Patents
The iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection Download PDFInfo
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Abstract
The present invention relates to the iron-smelting process of a kind of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection, refer to high-phosphor oolitic hematite, coal, slaked lime, water glass four kinds of materials after wet mixing, granulation, drying, send in gas reduction shaft furnace, under the effect of high-temperature reducing gas, the reduction of ferrous oxide in high-phosphor oolitic hematite powder is made to be fe, make phosphorus remain in slag under the solid phosphorus effect of CaO, after magnetic separation, then produce the process of iron ore concentrate and rich phosphorus slag.The present invention, compared with other iron-smelting process processing high-phosphor oolitic hematite, has that reduction temperature is lower, reduction rate is fast, flow process is short, efficiency is high, product quality is high, cost is low, is easy to scale production, feature that practical value is high.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of iron-smelting process of iron ore, particularly relate to a kind of high-phosphor oolitic hematite gas-based shaft kiln directly reduced-the non-blast furnace ironmaking technique of mill ore magnetic selection.
Background technology
Along with the development of China's metallurgy industry, the demand of China to iron ore also increases day by day.Due to China's iron ore supply wretched insufficiency, therefore the dependence of China to imported Fe ore is increasing, in order to ensure the sustainable and healthy development of China's steel industry, strengthen seeming extremely urgent to the scientific research of idle iron ore, high-phosphor oolitic hematite, because of the huge feature of its reserves, just more and more causes the attention of people.
Prior art for the treatment of high-phosphor oolitic hematite comprises conventional beneficiation method and direct reduction process.Conventional ore dressing cannot owing to cannot destroy or the extremely difficult roe nuclear structure destroyed in high-phosphor oolitic hematite, therefore iron recovery, Iron grade and dephosphorization rate are all undesirable.In direct reduction process, tunnel furnace carries out small-scale production, although also good technical indicator can be reached, and, owing to yielding poorly, energy consumption is higher, seriously polluted, is expressly forbidden by many countries; Rotary hearth furnace easily bonds due to high temperature, and reduction effect is undesirable, therefore is also unsuitable for processing high-phosphor oolitic hematite.
Summary of the invention
In view of above-mentioned present situation, the present invention aims to provide the iron-smelting process of a kind of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection.The present invention adopts non-blast furnace direct reduction process, configured by rational processing parameter, while the reduction of obstruction phosphorus ore containing, realize the reduction of iron in ore oxide compound, later stage realizes being separated, for steel industry provides high-quality iron material of iron and phosphorus by the mode of magnetic separation.
Object of the present invention is mainly achieved through the following technical solutions: a kind of iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection, refer to high-phosphor oolitic hematite, coal, slaked lime, water glass four kinds of materials by a certain percentage after wet mixing, granulation, drying, send in gas-based reduction shaft furnace, under the effect of reducing gas, reduction of ferrous oxide is fe, make phosphorus remain in slag under the solid phosphorus effect of CaO, after ore grinding, magnetic separation, then produce the process of iron ore concentrate and rich phosphorus slag.
The proportioning of described high-phosphor oolitic hematite, coal, slaked lime, water glass four kinds of materials is: by weight percentage, high-phosphor oolitic hematite: 72%; Coal: 11%; Slaked lime: 12%; Water glass: 5%.
Described water glass is the water glass of 40%-47% by purity, and effective constituent is 5Na
2o2SiO
2.
Described coal is non-coking coal, coal powder size >60 order.
Described slaked lime, the water accounting for unslaked lime 32% with addition of weight for unslaked lime mixes.
Described reducing gas is coal gas, component requirements: CO+H
2>90%, N
2<10%.
Described reducing gas is divided into high temperature and low temperature two-way to pass into, and wherein high-temperature reducing gas is 1000-1100 DEG C, passes into from the middle and lower part of shaft furnace, and low-temperature reduction gas is through the stock gas of cooling, and temperature, lower than 75 DEG C, passes into from furnace bottom.
Specifically, this technique comprises the steps:
The first step, raw material prepares
Prepare 4 kinds of raw materials: high-phosphor oolitic hematite powder, coal dust, slaked lime, water glass, wherein water glass purity 40%-47%, coal dust is non-coking coal, and slaked lime is that the water that unslaked lime accounts for unslaked lime 32% with addition of weight mixes;
Described 4 kinds of raw materials are carried out mixing by following weight ratio and mix well by second step
High-phosphor oolitic hematite: 72%; Coal: 11%; Slaked lime: 12%; Water glass: 5%;
3rd step, granulation is also dry
Be placed on ball press by described even batch mixing and carry out pressure ball, the pelletizing of extrusion is sent in moisture eliminator and carries out drying;
4th step, smelts
Send into shaft furnace by pelletizing from gas reduction shaft furnace top, pass into the reducing gas of 1000-1100 DEG C from downward 2/3 place of furnace roof, bottom shaft furnace, pass into treated stock gas, temperature is lower than 75 DEG C simultaneously;
Recovery time is 4h;
The component requirements of described reducing gas is CO+H
2>90%, N
2<10%;
5th step, ore grinding-magnetic separation
The material that shaft furnace bottom discharging mouth is discharged is carried out ore grinding-magnetic separation, by the iron charge agglomeration after magnetic separation, forms block iron charge.
Further, after pressure ball, before drying, through being screened by described ball material, leave the step of screen overflow.
Described mill ore magnetic selection process comprises: adopt rod mill to carry out disposable ore grinding 8min, then adopts magnetic separator to carry out disposable sorting.
As can be seen from technique scheme provided by the invention, a kind of high-phosphor oolitic hematite of the present invention is gas-based shaft kiln directly reduced-the non-blast furnace ironmaking technique of mill ore magnetic selection, due to high-phosphor oolitic hematite 72%, coal 11%, slaked lime 12% and water glass 5% is mixed pelletizing, and in shaft furnace, pass into high-temperature reducing gas carry out reducing and smelting, and the solidification of calcium oxide to phosphorus is utilized to realize reduced iron, stay the object of phosphorus; Afterwards, by ore grinding, magnetic separation separating ferrum, agglomeration, forms block iron charge, and the degree of metalization of high-phosphor oolitic hematite can be reached more than 90%, magnetic concentrate grade brings up to 78%, and iron recovery can more than 90%, and in iron ore concentrate, phosphorus content can reduce by 70%.
In the present invention, utilizing low, the fireballing feature of gas-based reduction temperature, is fe by the reduction of ferrous oxide in high-phosphor oolitic hematite, and utilizes the solid phosphorus effect of CaO, makes phosphorus remain in slag, produces rich phosphorus slag after mill ore magnetic selection.Technique of the present invention, compared with other operational path, has that reduction temperature is lower, reduction rate is fast, flow process is short, efficiency is high, cost is low, product quality is high, is easy to scale production, feature that practical value is high.Adopt the present invention, eliminate the heavy-polluted sintering of traditional technology, coking process, can Appropriate application natural resources and the energy to greatest extent, be that a kind of high-phosphor oolitic hematite that utilizes carries out the high-efficiency environment friendly technique of smelting iron.
Other features and advantages of the present invention will be set forth in the following description, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification sheets, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Fig. 1 be a kind of high-phosphor oolitic hematite of the present invention gas-based shaft kiln directly reduced-schema of the non-blast furnace ironmaking technique of mill ore magnetic selection.
Accompanying drawing only for illustrating the object of specific embodiment, and does not think limitation of the present invention.
Embodiment
Specifically describe the present invention below in conjunction with accompanying drawing and preferred embodiment, wherein, accompanying drawing forms the application's part, and is used from embodiment one and explains principle of the present invention.
A kind of high-phosphor oolitic hematite of the present invention is gas-based shaft kiln directly reduced-the non-blast furnace ironmaking technique of mill ore magnetic selection, mainly say red for high-phosphor oolitic iron powdered iron ore, after coordinating coal dust, slaked lime (unslaked lime+water), water glass according to a certain percentage, after granulation, screening, drying, drop in gas base directly reducing shaft furnace, under the effect of high-temperature reducing gas, the reduction of ferrous oxide in high-phosphor oolitic hematite is made to be fe, and utilize the solid phosphorus effect of CaO, make phosphorus remain in slag, after ore grinding, magnetic separation, then produce the process of iron ore concentrate and rich phosphorus slag.
Its preferably embodiment as shown in Figure 1, comprise the steps:
1) first raw material preparation is carried out
Prepare 5 kinds of starting material: high-phosphor oolitic hematite, coal, slaked lime, water glass.Above-mentioned starting material mix with powder form.
High-phosphor oolitic hematite: be applicable to typical " Ningxiang's formula " high-phosphor oolitic hematite, the iron content 35-52% that this ore deposit is general, siliceous 8-18%, containing aluminium and calcium 3-9%, phosphorous 0.3-1.8%.Certainly, other class high-phosphor oolitic hematites of nature also go for this technique.
Coal: various non-coking coal can be selected.
Slaked lime: the water accounting for unslaked lime 32% with addition of weight for unslaked lime mixes.Because unslaked lime pelletizing easily makes pelletizing efflorescence, therefore need add water to unslaked lime and digest.
Water glass: select purity to be the water glass of 40%-47%, effective constituent is 5Na
2o2SiO
2.
2) above-mentioned 4 kinds of raw materials are undertaken joining even by following weight ratio
Proportioning is as follows: high-phosphor oolitic hematite: 72%; Coal: 11%; Slaked lime: 12%; Water glass: 5%.Coal is lower than this numerical value, iron crystal grain can be caused in reduction process effectively not condense grow up, the value effect basicity of slaked lime, pelletizing fusing point then can be caused to reduce lower than this numerical value, pelletizing is sticked together in shaft furnace, cause shaft furnace to block, water glass can make pellet strength reduce lower than this numerical value, can not reach shaft furnace production standard.
3) pelletizing
Be placed on ball press by above-mentioned even batch mixing and carry out pressure ball, the pelletizing of extrusion is sent in moisture eliminator and carries out drying.If there is disintegrating slag in pressure ball process, round roller can be crossed before pelletizing sends into moisture eliminator and screen.Also the process of screening can be added after drying.
The ball press be suitable for can be pair roller type high-pressure ball press, and the ball block hardness created is high, and go out ball rate high, residue is few, and pellet size is suitable.
Be in the mode of pelletizing, mixture pelleting is shaping in this embodiment, because the round and smooth mobility of spherical surface is strong, utilizes circle to roll method balling-up processing in addition and also facilitate, but the present invention is also defined in this, any be conducive to flowing granular can, such as cylindrical, oval etc.
4) smelt
Dry pelletizing is smelted.Pelletizing is sent into shaft furnace from reduction shaft furnace top, in shaft furnace middle and lower part, about from downward 2/3 place of furnace roof, high-temperature gas entrance is set, passes into the high temperature reduction coal gas of 1100-1200 DEG C; Bottom shaft furnace, offer cryogenic gas entrance simultaneously, pass into the reducing gas less than or equal to normal temperature (being generally 25 DEG C).
The component requirements of reducing gas is here CO+H
2>90%, N
2<10%, could make reactant reduce thoroughly because only have containing a large amount of reducing gas CO fully.
Through Metal In Shaft Furnace out be sponge iron, through practical proof, above-mentioned technique iron charge temperature out, greatly about 100 DEG C-200 DEG C, need not be carried out cooling process again, directly can send into mill ore magnetic selection.
5) described sponge iron is carried out mill ore magnetic selection, the iron powder after sorting adopts briquetting apparatus to carry out compacting agglomeration, forms block iron charge, is convenient to transport and smelts, completing refining technique.
In the present invention, we select shaft furnace, and above-mentioned shaft furnace can be the shaft furnace equipment of all applicable gas base directly reducings.Because shaft furnace is suitable for gas radical reaction mechanism, (solid walks downward for solid and gas countercurrent flow, gas is up walked), solid can be conducive to so fully contact with gas, if gas passes into from bottom, solid almost can touch gas in walking whole process, more favourable for gas-solid reaction.If select horizontal type stove, gas has floating characteristic, then all concentrate on furnace roof, and solid only in stove, bottom runs, the area of contact is little like this, to reacting unfavorable.
Present invention process utilizes gas base redox mechanism, allows the phosphorus in ore redox reaction not occur as far as possible, utilize the solid phosphorus effect of the CaO in compound simultaneously, remained in by phosphorus in slag; And allow the iron in ore that redox reaction occurs as much as possible, restore single-crystal iron, discharge with the form of sponge iron.
So the present invention selects coal gas as reducing gas, one is because the main component of coal gas is CO and H
2, CO is common reducing gas; Two is that the main component contained is iron, silicon, phosphorus etc., silicon, and phosphorus can not participate in reduction reaction by CO because in iron ore; Three is that in the 4 kinds of raw materials used in this technique, high-phosphor oolitic hematite, coal, slaked lime, water glass all do not have radical response with coal gas, can not produce toxic gas, can not affect the reduction of iron.
Further, in use reducing gas, in order to improve the utilization ratio of coal gas, can the mechanism of recycling be set up: when the reducing gas of heat overflows from furnace roof, can (pass into CaO through the process of dedusting pressure-variable adsorption, slough CO
2become CO), heating receive again become high temperature reduction gas.Or through interchanger heat exchange, become cold clean reducing gas, again pass into from furnace bottom and recycle.
In the present invention, we pass into the coal gas of high temperature of 1000-1100 DEG C, because 900-1100 DEG C is the better reduction temperature of iron, and phosphorus reductibility is now little, so pass into the coal gas of high temperature of 1000-1100 DEG C, be optimum temps, make the reduction of ferrous oxide in high-phosphor oolitic hematite be fe, and phosphorus still remain unchanged with the state of phosphatic rock.The gas passed into will more than 1000 DEG C, and scholar's body (mixture of FeO and Fe) is floated in the too low easy generation of temperature.
Although high-temperature gas reduction effect is good, if but it is too hot, the temperature of sponge iron of coming out of the stove is just very high, be unfavorable for comminution magnetic separation, need ability magnetic separation of again lowering the temperature, therefore preferably scheme is that major part participation conversion zone all passes into high temperature reduction gas in shaft furnace, only pass into cold identical reducing gas-coal gas at furnace bottom, allow furnace bottom discharging portion potential drop temperature, avoid secondary oxidation, going out furnace charge so just need not again through cooling step simultaneously.Meanwhile, most of material, when descending on stove, have passed through long reduction, has substantially terminated, so furnace bottom temperature low spot does not affect reduction effect when arriving furnace bottom.Bottom shaft furnace, offer cryogenic gas entrance, pass into treated stock gas (generally lower than 75 DEG C).
We are when passing into high temperature reduction gas, the reason that selection passes at distance furnace roof about 2/3 place is: from furnace roof, downward 2/3 place passes into reducing gas, it is suitable height, because gas is lighter, only can be floating upward, if the entrance height passing into gas is too high, gas more can to the floating accumulation of stove inner top, reducing agents for furnace bottom does not reach reducing gas, make to participate in reduction, even if can touch reducing gas when reactant falls from furnace roof, but this is also the process of moment, and reactant has little time to participate in reaction at all.Again because, should stored in a large amount of materials in Reaktionsofen yet, this technique general knowledge, if so the gas height passed into is too high, the place passed into does not have reactant at all, and gas directly cannot be blown into reactant inside with larger pressure in ingress at all, causes internal-response insufficient.So, grope test through a large amount of, utilize the floating characteristic of gas, achieve and pass into from downward 2/3 place of furnace roof the conclusion that reducing gas is better position, the mileage that hot gas floats is long, and the material participating in reduction reaction in stove is just many, the stroke that high temperature reduction district gone through by material is also long, is beneficial to reduction.
Passing into of gas was synchronously carried out with adding of pelletizing, and while reducing gas passes into, pelletizing constantly adds from furnace roof portion, discharge from furnace bottom, and pelletizing is about 4h (namely recovery time) top-down working time in shaft furnace.What discharge bottom shaft furnace after reduction is sponge iron.
The reducing gas of heat overflows from furnace roof, can also become the reducing gas of temperatures as high 1100 DEG C, again pass into from stove middle and lower part and recycle through dedusting, pressure-variable adsorption, the means that reheat.Because the reducing gas of coming out of the stove is after oxidization-reduction, CO has become CO
2, so also need, through pressure-variable adsorption (passing into CaO), to slough CO
2become CO.Address above.
Ore grinding of the present invention, magnetic separation: comprise and adopt rod mill to carry out disposable ore grinding 8min, then adopt magnetic separator to carry out disposable sorting.Grinding attachment, for be advisable with rod mill, finally adopts magnetic plant to carry out sorting.Belong to common process herein.
Here is a specific embodiment:
By somewhere iron content 44.38%, phosphorous 0.94% high-phosphor oolitic hematite, according to high-phosphor oolitic hematite: coal: slaked lime: through ball press pressure ball after the ratio mixing of water glass=72:11:12:5, shaft furnace is loaded after the reduction of 4h after dry, sponge iron is discharged bottom shaft furnace, after crushing-magnetic selection agglomeration, obtain iron content 85%, phosphorous 0.15% direct-reduction iron block, in high-phosphor oolitic hematite, the rate of recovery of iron is 92.57%.Often produce one ton of iron block, consume high-phosphor oolitic hematite 2.5 tons, coal 0.395, water glass 0.165,0.408 ton, Wingdale, 3 tons, water, electric 150kwh.
In the present invention, utilizing low, the fireballing feature of gas-based reduction temperature, is iron monocrystal by the reduction of ferrous oxide in high-phosphor oolitic hematite, and utilizes the solid phosphorus effect of CaO, makes phosphorus remain in slag, produces rich phosphorus slag after mill ore magnetic selection.Technique of the present invention with other for the treatment of high-phosphor oolitic hematite iron smelting method operational path compared with, have that reduction temperature is low, reduction rate is fast, flow process is short, efficiency is high, cost is low, be easy to scale production, feature that practical value is high.Adopt the present invention, eliminate the heavy-polluted sintering of traditional technology, coking process, can Appropriate application natural resources and the energy to greatest extent, be that a kind of high-phosphor oolitic hematite that utilizes carries out the high-efficiency environment friendly technique of smelting iron.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should in the middle of right of the present invention.
Claims (10)
1. the iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection, it is characterized in that, refer to high-phosphor oolitic hematite, coal, slaked lime, water glass four kinds of materials by a certain percentage after wet mixing, granulation, drying, send in gas reduction shaft furnace, under the effect of reducing gas, reduction of ferrous oxide is single-crystal iron, makes phosphorus remain in slag under the solid phosphorus effect of CaO, after ore grinding, magnetic separation, then produces the process of iron ore concentrate and rich phosphorus slag.
2. the iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection according to claim 1, is characterized in that, the proportioning of described high-phosphor oolitic hematite, coal, slaked lime, water glass four kinds of materials is: by weight percentage,
High-phosphor oolitic hematite: 72%; Coal: 11%; Slaked lime: 12%; Water glass: 5%.
3. the iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection according to claim 1, is characterized in that, described water glass, is the water glass of 40%-47% by purity, and effective constituent is 5Na
2o2SiO
2.
4. the iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection according to claim 1, is characterized in that, described coal, is non-coking coal, coal powder size >60 order.
5. the iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection according to claim 1, it is characterized in that, described slaked lime, the water accounting for unslaked lime 32% with addition of weight for unslaked lime mixes.
6. the iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection according to claim 1, is characterized in that, described reducing gas is gas maked coal, component requirements: CO+H
2>90%, N
2<10%.
7. the iron-smelting process of the high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection according to claim 1 or 6, it is characterized in that, described reducing gas is divided into high temperature and low temperature two-way to pass into, wherein high-temperature reducing gas is 1000-1100 DEG C, pass into from the middle and lower part of shaft furnace, low-temperature reduction gas is through the stock gas of cooling, and temperature, lower than 75 DEG C, passes into from furnace bottom.
8. the iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection according to claim 1, is characterized in that, specifically comprise the steps:
The first step, raw material prepares
Prepare 4 kinds of raw materials: high-phosphor oolitic hematite powder, coal dust, slaked lime, water glass, wherein water glass purity 40%-47%, coal dust is non-coking coal, and slaked lime is that the water that unslaked lime accounts for unslaked lime 32% with addition of weight mixes;
Described 4 kinds of raw materials are carried out mixing by following weight ratio and mix well by second step
High-phosphor oolitic hematite: 72%; Coal: 11%; Slaked lime: 12%; Water glass: 5%;
3rd step, granulation is also dry
Be placed on ball press by described even batch mixing and carry out pressure ball, the pelletizing of extrusion is sent in moisture eliminator and carries out drying;
4th step, smelts
Pelletizing is sent into shaft furnace from gas reduction shaft furnace top, passes into the reducing gas of 1000-1100 DEG C simultaneously from downward 2/3 place of furnace roof, bottom shaft furnace, pass into the reducing gas of normal temperature;
Recovery time is 4h;
The component requirements of described reducing gas is CO+H
2>90%, N
2<10%;
5th step, ore grinding-magnetic separation
The material that shaft furnace bottom discharging mouth is discharged is carried out ore grinding-magnetic separation, by the iron charge agglomeration after magnetic separation.
9. the iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection according to claim 8, is characterized in that, after pressure ball, before drying, through being screened by described ball material, leaves the step of screen overflow.
10. the iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection according to claim 8, it is characterized in that, described mill ore magnetic selection process comprises: adopt rod mill to carry out disposable ore grinding 8min, then adopts magnetic separator to carry out disposable sorting.
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| CN105695734A (en) * | 2016-02-24 | 2016-06-22 | 武汉科技大学 | Industrial production method for conducting iron increase and phosphorous reduction on high-phosphorus oolitic hematite |
| CN105734192A (en) * | 2016-02-24 | 2016-07-06 | 武汉科技大学 | Beneficiation production method for low-grade hematite |
| CN106906327A (en) * | 2017-03-24 | 2017-06-30 | 贵州大学 | A kind of method that high-phosphor oolitic hematite efficiently carries iron |
| CN110512043A (en) * | 2019-09-11 | 2019-11-29 | 中南大学 | A kind of method of gas-based shaft kiln calcined limestone coproduction iron ore prereduction product |
| CN111621611A (en) * | 2020-06-03 | 2020-09-04 | 北京科技大学 | Two-step method for efficiently separating iron and phosphorus from high-phosphorus iron-containing resource based on gas-based energy |
| CN111719031A (en) * | 2020-07-31 | 2020-09-29 | 西安建筑科技大学 | Method for directly reducing iron ore powder by gas base |
| WO2021230307A1 (en) | 2020-05-14 | 2021-11-18 | 日本製鉄株式会社 | Method for producing reduced iron |
| WO2021241272A1 (en) | 2020-05-28 | 2021-12-02 | 日本製鉄株式会社 | Method for producing reduced iron |
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| CN103667687A (en) * | 2013-10-25 | 2014-03-26 | 钢铁研究总院 | Method for preventing pellets from high temperature reduction bonding in high phosphorus oolitic hematite treatment shaft furnace |
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| CN105734192A (en) * | 2016-02-24 | 2016-07-06 | 武汉科技大学 | Beneficiation production method for low-grade hematite |
| CN105734192B (en) * | 2016-02-24 | 2018-11-20 | 武汉科技大学 | A kind of mineral processing production method of low grade hematite |
| CN105695734A (en) * | 2016-02-24 | 2016-06-22 | 武汉科技大学 | Industrial production method for conducting iron increase and phosphorous reduction on high-phosphorus oolitic hematite |
| CN106906327A (en) * | 2017-03-24 | 2017-06-30 | 贵州大学 | A kind of method that high-phosphor oolitic hematite efficiently carries iron |
| CN110512043A (en) * | 2019-09-11 | 2019-11-29 | 中南大学 | A kind of method of gas-based shaft kiln calcined limestone coproduction iron ore prereduction product |
| WO2021230307A1 (en) | 2020-05-14 | 2021-11-18 | 日本製鉄株式会社 | Method for producing reduced iron |
| WO2021241272A1 (en) | 2020-05-28 | 2021-12-02 | 日本製鉄株式会社 | Method for producing reduced iron |
| CN111621611B (en) * | 2020-06-03 | 2021-10-15 | 北京科技大学 | Two-step method for efficiently separating iron and phosphorus from high-phosphorus iron-containing resource based on gas-based energy |
| CN111621611A (en) * | 2020-06-03 | 2020-09-04 | 北京科技大学 | Two-step method for efficiently separating iron and phosphorus from high-phosphorus iron-containing resource based on gas-based energy |
| CN111719031A (en) * | 2020-07-31 | 2020-09-29 | 西安建筑科技大学 | Method for directly reducing iron ore powder by gas base |
| CN114107590A (en) * | 2021-11-26 | 2022-03-01 | 钢铁研究总院 | Pellet oxidizing roasting-pure hydrogen reduction cooling system and method |
| CN114107591A (en) * | 2021-11-26 | 2022-03-01 | 钢铁研究总院 | Heating-pure hydrogen reduction cooling system and method |
| CN114107590B (en) * | 2021-11-26 | 2023-01-10 | 钢铁研究总院 | Pellet oxidizing roasting-pure hydrogen reduction cooling system and method |
| CN114798136A (en) * | 2022-04-20 | 2022-07-29 | 中南大学 | Process and device for efficiently utilizing complex iron-containing resources by reduction-grinding separation method |
| CN114798136B (en) * | 2022-04-20 | 2023-08-08 | 中南大学 | Process and device for efficiently utilizing complex iron-containing resources by reduction-grinding separation method |
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