CN102839249A - Method for producing iron fine powder by directly reducing high-iron red mud with rotary hearth furnace - Google Patents
Method for producing iron fine powder by directly reducing high-iron red mud with rotary hearth furnace Download PDFInfo
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- CN102839249A CN102839249A CN2012102758698A CN201210275869A CN102839249A CN 102839249 A CN102839249 A CN 102839249A CN 2012102758698 A CN2012102758698 A CN 2012102758698A CN 201210275869 A CN201210275869 A CN 201210275869A CN 102839249 A CN102839249 A CN 102839249A
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Abstract
The invention relates to a method for producing iron fine powder by directly reducing high-iron red mud with a rotary hearth furnace. The method comprises the following steps of drying the high-iron red mud, distributing materials with a reducing agent according to a certain proportion, mixing the high-iron red mud and the reducing agent, pressing into pellets, and thus fresh pellets are obtained; 2) putting the above fresh pellets into the rotary hearth furnace after a screening-drying-rescreening process, performing directly reduction in the rotary hearth furnace to obtain metallized pellets; and 3) cooling the metallized pellets, breaking the metallized pellets, performing gravity separation and magnetic separation, so that the iron fine powder is obtained. The performance indexes of the iron fine powder are as follows: the percentage of TFe is higher than 60%; the percentage of Al2O3 is less than 2.0%; the percentage of SiO2 is less than 4.0%; the percentage of Na2O is less than 0.3%, and the percentage of the portion with the granularity less than 74 [mu]m is higher than or equal to 70%. The method effectively solves the problems of low content of iron and high content of Al2O3, SiO2 and Na2O in the iron fine powder prepared by multi-stage magnetic separation of the high-iron red mud. The quality of the obtained iron fine powder meets the requirements of raw materials of steel works. The method can be widely used in the steel works, and provides an outlet for high-efficiency utilization of the high-iron red mud.
Description
Technical field
The invention belongs to the metallurgy industry technical field, particularly a kind of rotary hearth furnace directly reduces the method that iron red mud is produced the smart powder of iron.
Background technology
Iron red mud is the residue that produces through sorting technology in the Bayer process aluminum oxide production process, and its major ingredient is red stone and aluminum oxide, also contains a certain amount of silicon oxide, sodium oxide, Natural manganese dioxide, quicklime etc.At present, iron red mud is mainly produced through the mode of multi-stage magnetic separation and is contained 45%～50%TFe, 8%～15%Al
2O
3, 5%～15%SiO
2, 2%～8%Na
2The smart powder of the iron of O is used for steel works sintering and uses.Because iron in the red mud and aluminium are trivalent element, the two often exists with symbiotic form, only extracts the smart powder of iron through the mode of multi-stage magnetic separation, is difficult to realize that Fe, Al fully separate; And the red mud granularity is thinner, magnetic separation weak effect during multi-stage magnetic separation, thereby cause the TFe content of the smart powder of the iron of carrying on the low side, Al
2O
3, SiO
2, Na
2Foreign matter contents such as O are higher.
In the prior art, iron red mud is compared with the smart powder of iron that Iron And Steel Plant normally use through the smart powder of multi-stage magnetic separation gained iron, and iron content is low, Al
2O
3, SiO
2, Na
2O is higher.The smart powder of this multi-stage magnetic separation gained iron is used for Iron And Steel Plant's production can produces following detrimentally affect: (1) iron content is low, can reduce grade of sinter, thereby reduces Iron And Steel Plant's production efficiency; (2) Na
2O content is higher, can corrode whole ironmaking production system, reduces service life of equipment; (3) Al
2O
3, SiO
2Content is higher, causes slag ratio to increase, and the retrogradation of slag viscosity increases the blast furnace operating difficulty.Exactly because also above-mentioned reason; Iron red mud can not be widely used in Iron And Steel Plant through the smart powder of multi-stage magnetic separation gained iron; Iron red mud also has only part production seldom to be the smart powder of iron, and all the other major parts are used for cement, building trade, finally cause iron red mud can't realize efficient utilization.
Summary of the invention
The objective of the invention is to, to the defective of prior art, thus the method that provides a kind of rotary hearth furnace reasonable in design, that technology is advanced, the heat energy utilization rate high, quality product is superior directly to reduce the smart powder of iron red mud production iron.
Be to realize the foregoing invention purpose, rotary hearth furnace provided by the invention directly reduces the method that iron red mud produces the smart powder of iron and comprises step:
1) iron red mud is dried processing after, prepare burden by a certain percentage with reductive agent, mix, pressure ball, make green-ball; The iron red mud water cut is big (being generally 25% ~ 40%) too, need dry processing and can get into the next procedure use.
2) above-mentioned green-ball gets into rotary hearth furnace after sieving, dry, rescreening branch, in rotary hearth furnace, directly reduce, and makes metallized pellet;
3) above-mentioned metallized pellet is cooled off, after the fragmentation, gravity treatment, magnetic separation, makes the smart powder of iron;
The performance index of the smart powder of described iron are: TFe＞60%, Al
2O
3＜2.0%, SiO
2＜4.0%, Na
2O＜0.3%, granularity is less than part>=70% of 74 μ m.
In the technique scheme, described iron red mud is the residue that produces through sorting technology in the Bayer process aluminum oxide production process, and its component and content ratio comprise: TFe 35%～42%, Al
2O
38%～20%, SiO
24%～15% and Na
2O 2%～10%, and granularity is less than part>=80% of 74 μ m in the described iron red mud.
A kind of improvement as technique scheme; The oven dry of the iron red mud in the said step 1) is handled and is adopted chain grate machine; The oven dry thermal source that oven dry is handled is from 200 ℃ that produce in this working method～900 ℃ preheated air; Drying time is 10～40 minutes, and the iron red mud temperature after the oven dry is 50 ℃～200 ℃, and the iron red mud moisture content after the oven dry is less than 12%.
Further, the oven dry thermal source that oven dry is handled in the said step 1) also comprises producer gas.The shortage of heat part is replenished with producer gas.
In the technique scheme, described reductive agent is coke powder or coal dust, granularity≤1mm.
In the technique scheme, but described blended step adopts the mixer of continuously feeding, discharging continuously to carry out batch mixing.
In the technique scheme, described pressure ball step adopts the high pressure ball press, and the green-ball diameter is 8mm～40mm.
As a kind of improvement of technique scheme, said step 2) in screening and again screening all to adopt roller screen, the gap of this roller screen be 8～12mm; Pelletizing is a screen overflow on the roller screen, and this screen overflow directly gets into next step; Rolling undersized particle is screen underflow, and this screen underflow returns the batching step in the step 1).
Another improvement as technique scheme; Said step 2) chain grate machine is adopted in the green-ball oven dry in; 200 ℃～900 ℃ the preheated air that the oven dry thermal source produces from present method; Drying time is 12～30 minutes, and the green-ball temperature after the oven dry is 50 ℃～700 ℃, and the green-ball moisture content after the oven dry is less than 4%.Through test, green-ball not explosion in 200 ℃～900 ℃ bake out temperature scopes, thus can adopt higher preheated air that it is dried, and help this system's high-temperature residual heat and utilize more efficiently.
Further, the oven dry of iron red mud handle to produce in the said step 1) dust and said step 2) in the green-ball oven dry handle the dust that produces and also will carry out dust removal process, gained dirt ash returns the burden process that gets in the step 1).Because the dust that produces in the described step is more, increase dust-removal system, dedusting gained dirt ash returns the burden process in the step 1, can fully, efficiently utilize iron red mud.
Another improvement as technique scheme; Step 2) rotary hearth furnace that adopts in is divided into five sections reduction sections; Comprise: prereduction section, one section of reduction, two sections of reduction, two sections of one section of soaking and soaking; The temperature that two sections of reduction of the highest temperature and soaking are one section is 1300 ℃～1400 ℃, and the recovery time is 20～60 minutes.The high temperature reduction of enough time can be so that the red stone in the iron red mud be fully reduced and grain growth, thereby realizes that Fe, Al element effectively separate, and guarantee that the slag iron of follow-up magnetic separation effectively separates.
Preferably, described prereduction section temperature is that 900 ℃～1200 ℃, one section temperature of reduction are that 1200 ℃～1300 ℃, two sections temperature of reduction are that 1300 ℃～1400 ℃, one section temperature of soaking are that 1300 ℃～1400 ℃, two sections temperature of soaking are 1200 ℃～1300 ℃.
In the technique scheme, the coal gas medium that described rotary hearth furnace adopted is coke-oven gas, high coke mixed gas or producer gas.
As also a kind of improvement of technique scheme, said step 2) in connect smoke heat replacing device behind 900 ℃～1200 ℃ high-temperature flue gas coming out of rotary hearth furnace, use air heating through smoke heat replacing device to advancing stove air and oven dry.The combustion air and the secondary air temperature of coming out from heat-exchanger rig are 300 ℃～700 ℃, and it is 750 ℃～1050 ℃ that AT is used in the oven dry of coming out from heat-exchanger rig, receive step 1) and step 2 after converting an amount of cold wind as required) baking operation.
The temperature of the metallized pellet that makes in the technique scheme, said step 2) is 800 ℃～1000 ℃.Behind high temperature reduction, the temperature of coming out from rotary hearth furnace is 800 ℃～1000 ℃ to metallized pellet in rotary hearth furnace, and this temperature level and reduction temperature, discharge method and AT etc. have relation.
Existing multi-stage magnetic separation technology is through the magneticstrength and the gradient of adjustment magnetic separator material to be carried out magnetic separation.This process can't realize that Fe in the red mud, Al element symbiotic structure effectively separate.The general granularity of red mud is thinner, even if through multi-stage magnetic separation, its magnetic separation effect neither be fine, and the elimination factor of iron is low, and the iron grade of the smart powder of selected iron is low, and foreign matter contents such as Si, Al, Na are high.The smart powder of this iron can not directly get into sintering, blast furnace as normal raw material.
The present invention is through to red mud carbonaceous pelletizing reductase 12 0 ~ 60 minute under 1200 ℃～1400 ℃ temperature in rotary hearth furnace; Realize the effective separation and the iron grain growth of Fe, Al element symbiotic structure in the red mud; Thereby in follow-up magnetic separation operation, realize the high efficiency separation of Fe, Al, Si, also help improving the elimination factor of ferro element; Simultaneously, the Na in the red mud
2The sublimation temperature of O composition is 1275 ℃, in reduction process, and the Na more than 90%
2O is sublimate in the flue gas, gets into dedusting ash with flue gas, can greatly reduce Na in the smart powder of institute's iron of carrying
2O content reduces because of Na
2O gets into the alkali evil of sintering, blast furnace circulation enrichment generation, helps the production operation and the maintenance of the equipment of sintering, blast furnace.
In a word, this invention is exactly through high temperature reduction, makes that Fe, the Al element symbiotic structure in the red mud effectively separates, Na
2O removes, the iron grain growth, finally in follow-up magnetic separation operation, obtains quality and satisfies the smart powder of the iron of producing, and can improve the elimination factor of iron.
Rotary hearth furnace of the present invention directly reduces the method that iron red mud is produced the smart powder of iron, through 1) iron red mud is dried processing after, prepare burden by a certain percentage with reductive agent, mix, pressure ball, make green-ball.2) wet bulb gets into rotary hearth furnace and directly reduces after sieving, dry, rescreening branch, makes metallized pellet.900 ℃～1200 ℃ high-temperature flue gas of rotary hearth furnace advance flue gas waste heat recovery system, thereby realize the efficient utilization of heat energy.3) metallized pellet is cooled off, after the fragmentation, gravity treatment, magnetic separation, obtains the smart powder of iron.It is low through the smart powder iron content of multi-stage magnetic separation gained iron that the present invention efficiently solves iron red mud, Al
2O
3, SiO
2, Na
2The problem that O content is high.
The invention has the advantages that it is low through the smart powder iron content of multi-stage magnetic separation gained iron that the present invention efficiently solves in the prior art iron red mud, Al
2O
3, SiO
2, Na
2O content is high, can't normally be used the problem of usefulness by Iron And Steel Plant, and the smart powder of products obtained therefrom iron of the present invention satisfies Iron And Steel Plant's ingredient requirement, can be widely used in Iron And Steel Plant, for the efficient utilization of iron red mud provides outlet.
Description of drawings
Fig. 1 is that rotary hearth furnace of the present invention directly reduces iron red mud and produces the process flow sheet of the smart powder of iron.
Embodiment
As shown in Figure 1, rotary hearth furnace provided by the invention directly reduces the method that iron red mud produces the smart powder of iron and comprises step:
1) iron red mud is dried processing after, prepare burden by a certain percentage with reductive agent, mix, pressure ball, make green-ball.
2) green-ball gets into rotary hearth furnace after sieving, dry, rescreening branch, in rotary hearth furnace, directly reduces, and makes metallized pellet.
3) metallized pellet is carried out fragmentation, gravity treatment, magnetic separation after, make the smart powder of iron.
Wherein, in the said step 1), described iron red mud be in the Bayer process aluminum oxide production process through sorting technology produce residue, its performance index are: TFe 35%～42%, Al
2O
38%～20%, SiO
24%～15%, Na
2O 2%～10%, and granularity is less than 74um part>=80%.The iron red mud water cut is big (being generally 25% ~ 40%) too, need dry processing and can get into the next procedure use.
Wherein, In the said step 1), chain grate machine is adopted in described iron red mud oven dry, and the oven dry thermal source is from 200 ℃～900 ℃ self-produced preheated air of native system; The shortage of heat part is replenished with producer gas; Drying time is 10～40 minutes, and the red mud temperature after the oven dry is 50 ℃～200 ℃, and the iron red mud moisture content after the oven dry is less than 12%.The dust that this operation produces is more, needs to increase dust-removal system.Dedusting gained dirt ash returns the burden process in the step 1.
Wherein, in the said step 1), described reductive agent is coke powder or coal dust, granularity≤1mm.
Wherein, in the said step 1), described mixing is called batch mixing again, but adopts the mixer of continuously feeding, continuous discharging.
Wherein, in the said step 1), described pressure ball operation adopts the high pressure ball press.The green-ball diameter is 8mm～40mm.
Wherein, said step 2) in, described screening and again screening be meant: screening is all selected roller screen, the gap 8～12mm of roller screen for use with screening again; Pelletizing is referred to as screen overflow on the roller screen, and screen overflow directly gets into next procedure; Roll undersized particle and be referred to as screen underflow, screen underflow returns the burden process in the step 1).
Wherein, said step 2) in, chain grate machine is adopted in described green-ball oven dry; (through test, green-ball not explosion in 200 ℃～900 ℃ bake out temperature scopes is so can adopt higher preheated air that it is dried from 200 ℃～900 ℃ self-produced preheated air of native system for the oven dry thermal source; And help this system's high-temperature residual heat and utilize more efficiently); Drying time is 12～30 minutes, and the green-ball temperature after the oven dry is 50 ℃～700 ℃, and the green-ball moisture content after the oven dry is less than 4%.The dust that this operation produces is more, needs to increase dust-removal system.Dedusting gained dirt ash returns the burden process in the step 1).
Preferably, step 2) adopt rotary hearth furnace in as direct reduction furnace, divides five sections reduction (the prereduction section, reduce one section, reduce two sections, one section of soaking, two sections of soaking), one section temperature of two sections of reduction of the highest temperature and soaking is 1300 ℃～1400 ℃.20～60 minutes recovery times.The high temperature reduction of enough time can be so that the red stone in the iron red mud be fully reduced and grain growth, thereby realizes that Fe, Al element effectively separate, and guarantee effective separation of follow-up magnetic separation slag iron.
Preferably, prereduction section temperature is that 900 ℃～1200 ℃, one section temperature of reduction are that 1200 ℃～1300 ℃, two sections temperature of reduction are that 1300 ℃～1400 ℃, one section temperature of soaking are that 1300 ℃～1400 ℃, two sections temperature of soaking are 1200 ℃～1300 ℃.
The used coal gas medium of rotary hearth furnace is coke-oven gas, high coke mixed gas or producer gas.
Wherein, said step 2) in, connect smoke heat replacing device and residual neat recovering system behind 900 ℃～1200 ℃ high-temperature flue gas that rotary hearth furnace comes out.Heat through smoke heat replacing device that into stove air and oven dry are used air.The combustion air and the secondary air temperature of coming out from heat-exchanger rig are 300 ℃～700 ℃.It is 750 ℃～1050 ℃ that AT is used in the oven dry of coming out from heat-exchanger rig, receives step 1) and step 2 after converting an amount of cold wind as required) baking operation.
Wherein, said step 2) in, the metallized pellet temperature is 800 ℃～1000 ℃.
At last, the smart mealiness of the iron that obtains of said step 3) can index be: TFe＞60%, Al
2O
3＜2.0%, SiO
2＜4.0%, Na
2O＜0.3%, granularity is less than part>=70% of 74um.
Embodiment 1:
Adopt TFe 38%, Al
2O
315%, SiO
28%, Na
2The iron red mud of O 3.5% is carried out batch mixing with breeze, unslaked lime by the mass ratio of 86:12:4, and compound moisture content is controlled at about 9%, adopts the high pressure ball press to make the length and width height to be: the pillow shape green-ball of 20mm-30mm-40mm; Green-ball is hot-air seasoning 15min～20min in chain castor dryer, and moisture content is taken off to below 4%; Go in the rotary hearth furnace then to reduce,, obtain metallized pellet at 1280 ℃ of following reductase 12 5min～30min; The metallized pellet temperature is 80 ℃ ~ 950 ℃; Metallized pellet obtains TFe 62.2%, Al after cooling, fragmentation, gravity treatment, magnetic separation
2O
31.8%, SiO
23.8%, Na
2The smart powder of the iron of O 0.25% satisfies Iron And Steel Plant's ingredient requirement.
Embodiment 2:
Adopt TFe 38%, Al
2O
315%, SiO
28%, Na
2The iron red mud of O 3.5% is carried out batch mixing with coal dust, rhombspar by the mass ratio of 85:13:2, and compound moisture content is controlled at about 9%, adopts the high pressure ball press to make the length and width height to be: the pillow shape green-ball of 20mm-30mm-40mm; Green-ball is hot-air seasoning 15min～20min in chain castor dryer, and moisture content is taken off to below 4%; To going in the rotary hearth furnace to reduce,, obtain metallized pellet then at 1300 ℃ of following reduction 30min～35min; The metallized pellet temperature is 820 ℃ ~ 970 ℃; Metallized pellet obtains TFe 62.6%, Al after fragmentation, gravity treatment, magnetic separation
2O
31.9%, SiO
23.4%, Na
2The smart powder of the iron of O 0.23% satisfies Iron And Steel Plant's ingredient requirement.
Embodiment 3:
Adopt TFe 40%, Al
2O
314%, SiO
26%, Na
2The iron red mud of O 4.0% is carried out batch mixing with breeze, serpentine by the mass ratio of 86:12:2, and compound moisture content is controlled at about 9%, adopts the high pressure ball press to make the length and width height to be: the pillow shape green-ball of 20mm-30mm-40mm; Green-ball is hot-air seasoning 15min～20min in chain castor dryer, and moisture content is taken off to below 4%; To going in the rotary hearth furnace to reduce, at 1320 ℃ of following reductase 12 0min～25min, obtain metallized pellet then, the metallized pellet temperature is 850 ℃ ~ 1000 ℃; Metallized pellet obtains TFe 63.6%, Al after fragmentation, gravity treatment, magnetic separation
2O
31.6%, SiO
22.9%, Na
2The smart powder of the iron of O 0.27% satisfies Iron And Steel Plant's ingredient requirement.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is specified with reference to embodiment; Those of ordinary skill in the art is to be understood that; Technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (15)
1. a rotary hearth furnace directly reduces the method that iron red mud is produced the smart powder of iron, comprises step:
1) iron red mud is dried processing after, prepare burden by a certain percentage with reductive agent, mix, pressure ball, make green-ball;
2) above-mentioned green-ball gets into rotary hearth furnace after sieving, dry, rescreening branch, in rotary hearth furnace, directly reduce, and makes metallized pellet;
3) above-mentioned metallized pellet is cooled off, after the fragmentation, gravity treatment, magnetic separation, makes the smart powder of iron;
The performance index of the smart powder of described iron are: TFe＞60%, Al
2O
3＜2.0%, SiO
2＜4.0%, Na
2O＜0.3%, granularity is less than part>=70% of 74 μ m.
2. rotary hearth furnace as claimed in claim 1 directly reduces the method that iron red mud is produced the smart powder of iron; It is characterized in that: described iron red mud is the residue that produces through sorting technology in the Bayer process aluminum oxide production process, and its component and content ratio comprise: TFe 35%～42%, Al
2O
38%～20%, SiO
24%～15% and Na
2O 2%～10%, and granularity is less than part>=80% of 74 μ m in the described iron red mud.
3. rotary hearth furnace as claimed in claim 1 directly reduces the method that iron red mud is produced the smart powder of iron; It is characterized in that: the oven dry of the iron red mud in the said step 1) is handled and is adopted chain grate machine; The oven dry thermal source that oven dry is handled is from 200 ℃ that produce in this working method～900 ℃ preheated air; Drying time is 10～40 minutes, and the iron red mud temperature after the oven dry is 50 ℃～200 ℃, and the iron red mud moisture content after the oven dry is less than 12%.
4. rotary hearth furnace as claimed in claim 3 directly reduces the method that iron red mud is produced the smart powder of iron, and it is characterized in that: the oven dry thermal source that oven dry is handled in the said step 1) also comprises producer gas.
5. rotary hearth furnace as claimed in claim 1 directly reduces the method that iron red mud is produced the smart powder of iron, and it is characterized in that: described reductive agent is coke powder or coal dust, granularity≤1mm.
6. rotary hearth furnace as claimed in claim 1 directly reduces the method that iron red mud is produced the smart powder of iron, it is characterized in that: but described blended step adopts the mixer of continuously feeding, discharging continuously to carry out batch mixing.
7. rotary hearth furnace as claimed in claim 1 directly reduces the method that iron red mud is produced the smart powder of iron, and it is characterized in that: described pressure ball step adopts the high pressure ball press, and the green-ball diameter is 8mm～40mm.
8. rotary hearth furnace as claimed in claim 1 directly reduces the method that iron red mud is produced the smart powder of iron, it is characterized in that: the screening said step 2) with sieve again that all to adopt roller screen, the gap of this roller screen be 8～12mm; Pelletizing is a screen overflow on the roller screen, and this screen overflow directly gets into next step; Rolling undersized particle is screen underflow, and this screen underflow returns the batching step in the step 1).
9. iron refined powder producing process as claimed in claim 1; It is characterized in that: chain grate machine is adopted in the green-ball oven dry said step 2); 200 ℃～900 ℃ the preheated air that the oven dry thermal source produces from present method; Drying time is 12～30 minutes, and the green-ball temperature after the oven dry is 50 ℃～700 ℃, and the green-ball moisture content after the oven dry is less than 4%.
10. rotary hearth furnace as claimed in claim 1 directly reduces the method that iron red mud is produced the smart powder of iron; It is characterized in that: the oven dry of iron red mud handle to produce in the said step 1) dust and said step 2) in the green-ball oven dry handle the dust that produces and also will carry out dust removal process, gained dirt ash returns the burden process that gets in the step 1).
11. rotary hearth furnace as claimed in claim 1 directly reduces the method that iron red mud is produced the smart powder of iron; It is characterized in that: step 2) in the rotary hearth furnace that adopts be divided into five sections reduction sections; Comprise: prereduction section, one section of reduction, two sections of reduction, two sections of one section of soaking and soaking; One section temperature of two sections of reduction of the highest temperature and soaking is 1300 ℃～1400 ℃, and the recovery time is 20～60 minutes.
12. rotary hearth furnace as claimed in claim 11 directly reduces the method that iron red mud is produced the smart powder of iron, it is characterized in that: described prereduction section temperature is that 900 ℃～1200 ℃, one section temperature of reduction are that 1200 ℃～1300 ℃, two sections temperature of reduction are that 1300 ℃～1400 ℃, one section temperature of soaking are that 1300 ℃～1400 ℃, two sections temperature of soaking are 1200 ℃～1300 ℃.
13. rotary hearth furnace as claimed in claim 1 directly reduces the method that iron red mud is produced the smart powder of iron, it is characterized in that: the coal gas medium that described rotary hearth furnace adopted is coke-oven gas, high coke mixed gas or producer gas.
14. directly reduce the method that iron red mud produces the smart powder of iron like the described rotary hearth furnace of claim 1～13; It is characterized in that: connect smoke heat replacing device behind 900 ℃～1200 ℃ high-temperature flue gas that rotary hearth furnace comes out said step 2), use air heating to advancing stove air and oven dry through smoke heat replacing device.
15. directly reduce the method that iron red mud produces the smart powder of iron like the described rotary hearth furnace of claim 1～13, it is characterized in that: the temperature of the metallized pellet that makes said step 2) is 800 ℃～1000 ℃.
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| CN107419108A (en) * | 2017-07-31 | 2017-12-01 | 宝武集团环境资源科技有限公司 | A kind of method dried using rotary hearth furnace waste heat from tail gas |
| CN109576487A (en) * | 2019-01-11 | 2019-04-05 | 江苏荣鑫伟业新材料股份有限公司 | A method of iron is recycled using red mud and dedusting ash mixing reduction roasting magnetic separation |
| CN110496699A (en) * | 2019-07-12 | 2019-11-26 | 昆明理工大学 | A method of recycling fe from ion dust mud contaning |
| CN110863114A (en) * | 2019-11-22 | 2020-03-06 | 东北大学 | Method for recovering iron by using high-iron red mud and method for extracting aluminum by using high-iron red mud |
| CN115261611A (en) * | 2022-08-04 | 2022-11-01 | 天津铁厂有限公司 | Production method of magnesium pellet ore |
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