CN102839249B - 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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- CN102839249B CN102839249B CN201210275869.8A CN201210275869A CN102839249B CN 102839249 B CN102839249 B CN 102839249B CN 201210275869 A CN201210275869 A CN 201210275869A CN 102839249 B CN102839249 B CN 102839249B
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- iron
- red mud
- hearth furnace
- rotary hearth
- reduction
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Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000843 powder Substances 0.000 title abstract 6
- 238000000034 method Methods 0.000 claims abstract description 51
- 239000008188 pellet Substances 0.000 claims abstract description 27
- 238000007885 magnetic separation Methods 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 230000005484 gravity Effects 0.000 claims abstract description 8
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 claims description 56
- 239000012141 concentrate Substances 0.000 claims description 45
- 229910052782 aluminium Inorganic materials 0.000 claims description 22
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 16
- 238000002791 soaking Methods 0.000 claims description 15
- 229910052708 sodium Inorganic materials 0.000 claims description 14
- 238000012216 screening Methods 0.000 claims description 13
- 239000000428 dust Substances 0.000 claims description 9
- 230000002829 reductive effect Effects 0.000 claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 238000013467 fragmentation Methods 0.000 claims description 7
- 238000006062 fragmentation reaction Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- 238000004131 Bayer process Methods 0.000 claims description 4
- 239000002817 coal dust Substances 0.000 claims description 4
- 238000005453 pelletization Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000000571 coke Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- 239000003638 chemical reducing agent Substances 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 239000000377 silicon dioxide Substances 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- 238000003825 pressing Methods 0.000 abstract 1
- 239000011734 sodium Substances 0.000 description 22
- 239000004615 ingredient Substances 0.000 description 5
- 238000005245 sintering Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 235000004443 Ricinus communis Nutrition 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 235000011194 food seasoning agent Nutrition 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical group O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
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 metallurgy industry technical field, particularly a kind of rotary hearth furnace direct-reduction iron red mud produces the method for Iron concentrate.
Background technology
Iron red mud is that its major ingredient is ferric oxide and aluminum oxide through the residue that sorting technology produces in Bayer process aluminum oxide production process, also containing a certain amount of silicon oxide, sodium oxide, magnesium oxide, calcium oxide etc.At present, iron red mud is produced containing 45% ~ 50%TFe, 8% ~ 15%Al mainly through the mode of multi-stage magnetic separation
2o
3, 5% ~ 15%SiO
2, 2% ~ 8%Na
2the Iron concentrate of O, uses for steel works sintering.Because the iron in red mud and aluminium are trivalent element, the two often exists with the form of symbiosis, and the mode by means of only multi-stage magnetic separation extracts Iron concentrate, is difficult to realize Fe, Al and is fully separated; And red mud granularity is comparatively thin, magnetic separation weak effect during multi-stage magnetic separation, thus cause the TFe content of carried Iron concentrate on the low side, Al
2o
3, SiO
2, Na
2the foreign matter contents such as O are higher.
In prior art, compared with the Iron concentrate that iron red mud normally uses through multi-stage magnetic separation gained Iron concentrate and Steel Plant, iron content is low, Al
2o
3, SiO
2, Na
2o is higher.This multi-stage magnetic separation gained Iron concentrate is used for Steel Plant's production and can produces following detrimentally affect: (1) iron content is low, can reduce grade of sinter, thus reduce 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, the retrogradation of slag viscosity, increases blast furnace operating difficulty.Exactly because also above-mentioned reason, iron red mud can not widely use in Steel Plant through multi-stage magnetic separation gained Iron concentrate, iron red mud also only has a little part to produce as Iron concentrate, and all the other major parts are used for cement, building trade, finally cause iron red mud to realize efficiency utilization.
Summary of the invention
The object of the invention is to, for the defect of prior art, thus provide a kind of reasonable in design, method that technique is advanced, heat utilization rate is high, quality product is superior rotary hearth furnace direct-reduction iron red mud produces Iron concentrate.
For achieving the above object, the method for rotary hearth furnace direct-reduction iron red mud production Iron concentrate provided by the invention comprises step:
1) after iron red mud being carried out drying and processing, carry out by a certain percentage with reductive agent preparing burden, mix, pressure ball, obtained green-ball; Iron red mud water content too large (being generally 25% ~ 40%), need carry out drying and processing and can enter next procedure use.
2) above-mentioned green-ball, after screening, oven dry, again screening, enters rotary hearth furnace, in rotary hearth furnace, carries out direct-reduction, obtained metallized pellet;
3) above-mentioned metallized pellet is cooled, fragmentation, gravity treatment, after magnetic separation, obtained Iron concentrate;
The performance index of described Iron concentrate are: TFe > 60%, Al
2o
3< 2.0%, SiO
2< 4.0%, Na
2o < 0.3%, part>=70% that granularity is less than 74 μm.
In technique scheme, described iron red mud is that its component and content ratio comprise: TFe 35% ~ 42%, Al through the residue that sorting technology produces in Bayer process aluminum oxide production process
2o
38% ~ 20%, SiO
24% ~ 15% and Na
2o 2% ~ 10%, part>=80% that in described iron red mud, granularity is less than 74 μm.
One as technique scheme is improved, the drying and processing of the iron red mud in described step 1) adopts chain grate machine, the oven dry thermal source of drying and processing is from the preheated air of 200 DEG C that produce in this production method ~ 900 DEG C, drying time is 10 ~ 40 minutes, iron red mud temperature after oven dry is 50 DEG C ~ 200 DEG C, and the iron red mud moisture content after oven dry is less than 12%.
Further, in described step 1), the oven dry thermal source of drying and processing also comprises producer gas.Shortage of heat part producer gas supplements.
In technique scheme, described reductive agent is coke powder or coal dust, granularity≤1mm.
In technique scheme, the step of described mixing adopt can continuously feeding, continuous discharge mixer carry out batch mixing.
In technique scheme, described pressure ball step adopts high-pressure ball press, and green-ball diameter is 8mm ~ 40mm.
One as technique scheme is improved, described step 2) in screening and sieve again and all adopt roller screen, the gap of this roller screen is 8 ~ 12mm; On roller screen, pelletizing is screen overflow, and this screen overflow directly enters next step; Particle under roller screen is screen underflow, and this screen underflow returns the batching step in step 1).
As another improvement of technique scheme, described step 2) in green-ball dry adopt chain grate machine, dry the preheated air of 200 DEG C ~ 900 DEG C that thermal source produces from present method, drying time is 12 ~ 30 minutes, green-ball temperature after oven dry is 50 DEG C ~ 700 DEG C, and the green-ball moisture content after oven dry is less than 4%.Through test, green-ball does not burst within the scope of 200 DEG C ~ 900 DEG C bake out temperatures, therefore higher preheated air can be adopted to dry it, and is conducive to this system high temperature waste heat and utilizes more efficiently.
Further, in described step 1) iron red mud drying and processing produce dust and described step 2) in green-ball drying and processing produce dust also to carry out dust removal process, gained dirt ash returns the burden process entered in step 1).Because the dust produced in described step is more, increase dust-removal system, dedusting gained dirt ash returns burden process in step 1, can fully, efficiency utilization iron red mud.
As another improvement of technique scheme, step 2) in adopt rotary hearth furnace be divided into five sections of reduction sections, comprise: prereduction section, reduction one section, reduction two sections, soaking one section and soaking two sections, the reduction two sections of the highest temperature and the temperature of soaking one section are 1300 DEG C ~ 1400 DEG C, and the recovery time is 20 ~ 60 minutes.The high temperature reduction of enough time can make the ferric oxide in iron red mud fully be reduced and grain growth, thus realizes Fe, Al element and be effectively separated, and ensures that the slag iron of follow-up magnetic separation is effectively separated.
Preferably, described prereduction section temperature is 900 DEG C ~ 1200 DEG C, reduction one section of temperature is 1200 DEG C ~ 1300 DEG C, reduction two sections of temperature are 1300 DEG C ~ 1400 DEG C, soaking one section of temperature is 1300 DEG C ~ 1400 DEG C, soaking two sections of temperature are 1200 DEG C ~ 1300 DEG C.
In technique scheme, the gas medium that described rotary hearth furnace adopts is coke-oven gas, high coke mixed gas or producer gas.
Improve as the also a kind of of technique scheme, described step 2) in connect smoke heat replacing device, by smoke heat replacing device to entering stove air and oven dry air heating after rotary hearth furnace 900 DEG C ~ 1200 DEG C high-temperature flue gas out.Be 300 DEG C ~ 700 DEG C from heat-exchanger rig combustion air out and secondary air temperature, be 750 DEG C ~ 1050 DEG C from heat-exchanger rig oven dry air themperature out, after converting appropriate cold wind as required, receive step 1) and step 2) baking operation.
In technique scheme, described step 2) in the temperature of obtained metallized pellet be 800 DEG C ~ 1000 DEG C.Metallized pellet in rotary hearth furnace after high temperature reduction, be 800 DEG C ~ 1000 DEG C from rotary hearth furnace temperature out, this temperature level and reduction temperature, discharge method and air themperature etc. have relation.
Existing multi-stage magnetic separation technology is that the magneticstrength and gradient by adjusting magnetic separator carries out magnetic separation to material.This process cannot realize Fe, Al element symbiotic structure in red mud and effectively be separated.The general granularity of red mud is comparatively thin, 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 selected Iron concentrate is low, and the foreign matter contents such as Si, Al, Na are high.This Iron concentrate can not directly enter sintering, blast furnace as normal raw material.
The present invention is by red mud carbonaceous pelletizing reductase 12 0 ~ 60 minute at 1200 DEG C ~ 1400 DEG C temperature in rotary hearth furnace, realize effective separation and the iron grain growth of Fe, Al element symbiotic structure in red mud, thus in follow-up magnetic separation operation, realize the high efficiency separation of Fe, Al, Si, be also conducive to the elimination factor improving ferro element; Meanwhile, the Na in red mud
2the sublimation temperature of O composition is 1275 DEG C, in reduction process, and the Na of more than 90%
2o is sublimate in flue gas, enters dedusting ash with flue gas, greatly can reduce institute and carry Na in Iron concentrate
2o content, reduces because of Na
2the alkali evil that O enters sintering, blast furnace circulation collection produces, is conducive to sintering, the production operation of blast furnace and maintenance of the equipment.
In a word, this invention is exactly by high temperature reduction, such that Fe, Al element symbiotic structure in red mud is effectively separated, Na
2o removes, iron grain growth, finally in follow-up magnetic separation operation, obtains the Iron concentrate that quality meets production, and can improve the elimination factor of iron.
Rotary hearth furnace direct-reduction iron red mud of the present invention produces the method for Iron concentrate, by 1) drying and processing is carried out to iron red mud after, carry out by a certain percentage with reductive agent preparing burden, mix, pressure ball, obtained green-ball.2) wet bulb is after screening, oven dry, again screening, enters rotary hearth furnace direct-reduction, obtained metallized pellet.Rotary hearth furnace 900 DEG C ~ 1200 DEG C high-temperature flue gas enter flue gas waste heat recovery system, thus realize the efficiency utilization of heat energy.3) metallized pellet cooled, fragmentation, gravity treatment, after magnetic separation, obtain Iron concentrate.It is low through multi-stage magnetic separation gained Iron concentrate iron content 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 multi-stage magnetic separation gained Iron concentrate iron content that the present invention efficiently solves iron red mud in prior art, Al
2o
3, SiO
2, Na
2o content is high, the problem that normally cannot be used by Steel Plant, and products obtained therefrom Iron concentrate of the present invention meets Steel Plant's ingredient requirement, can widely use in Steel Plant, for the efficiency utilization of iron red mud provides outlet.
Accompanying drawing explanation
Fig. 1 is the process flow sheet that rotary hearth furnace direct-reduction iron red mud of the present invention produces Iron concentrate.
Embodiment
As shown in Figure 1, the method for rotary hearth furnace direct-reduction iron red mud production Iron concentrate provided by the invention comprises step:
1) after iron red mud being carried out drying and processing, carry out by a certain percentage with reductive agent preparing burden, mix, pressure ball, obtained green-ball.
2) green-ball is after screening, oven dry, again screening, enters rotary hearth furnace, in rotary hearth furnace, carries out direct-reduction, obtained metallized pellet.
3) after fragmentation, gravity treatment, magnetic separation being carried out to metallized pellet, obtained Iron concentrate.
Wherein, in described step 1), described iron red mud be in 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%, granularity is less than 74um part>=80%.Iron red mud water content too large (being generally 25% ~ 40%), need carry out drying and processing and can enter next procedure use.
Wherein, in described step 1), described iron red mud is dried and is adopted chain grate machine, dry thermal source from the self-produced preheated air of 200 DEG C ~ 900 DEG C of native system, shortage of heat part producer gas supplements, drying time is 10 ~ 40 minutes, and the red mud temperature after oven dry is 50 DEG C ~ 200 DEG C, and the iron red mud moisture content after oven dry is less than 12%.The dust that this operation produces is more, need increase dust-removal system.Dedusting gained dirt ash returns the burden process in step 1.
Wherein, in described step 1), described reductive agent is coke powder or coal dust, granularity≤1mm.
Wherein, in described step 1), described mixing is also called batch mixing, adopt can continuously feeding, continuous discharge mixer.
Wherein, in described step 1), described pressure ball operation adopts high-pressure ball press.Green-ball diameter is 8mm ~ 40mm.
Wherein, described step 2) in, described screening and again screening refer to: screening all selects roller screen, the gap 8 ~ 12mm of roller screen with sieving again; On roller screen, pelletizing is referred to as screen overflow, and screen overflow directly enters next procedure; Particle under roller screen is referred to as screen underflow, and screen underflow returns the burden process in step 1).
Wherein, described step 2) in, described green-ball is dried and is adopted chain grate machine, (through test, green-ball does not burst within the scope of 200 DEG C ~ 900 DEG C bake out temperatures, therefore higher preheated air can be adopted to dry it from the preheated air of native system self-produced 200 DEG C ~ 900 DEG C to dry thermal source, and be conducive to this system high temperature waste heat and utilize more efficiently), drying time is 12 ~ 30 minutes, and the green-ball temperature after oven dry is 50 DEG C ~ 700 DEG C, and the green-ball moisture content after oven dry is less than 4%.The dust that this operation produces is more, need increase dust-removal system.Dedusting gained dirt ash returns the burden process in step 1).
Preferably, step 2) the middle rotary hearth furnace that adopts is as direct-reduction stove, and point five sections of reduction (prereduction section, reduction one section, reduction two sections, soaking one section, soaking two sections), reduction two sections and soaking one section of temperature of the highest temperature are 1300 DEG C ~ 1400 DEG C.20 ~ 60 minutes recovery times.The high temperature reduction of enough time can make the ferric oxide in iron red mud fully be reduced and grain growth, thus realizes Fe, Al element and be effectively separated, and ensures effective separation of follow-up magnetic separation slag iron.
Preferably, prereduction section temperature is 900 DEG C ~ 1200 DEG C, reduction one section of temperature is 1200 DEG C ~ 1300 DEG C, reduction two sections of temperature are 1300 DEG C ~ 1400 DEG C, soaking one section of temperature is 1300 DEG C ~ 1400 DEG C, soaking two sections of temperature are 1200 DEG C ~ 1300 DEG C.
Rotary hearth furnace gas medium used is coke-oven gas, high coke mixed gas or producer gas.
Wherein, described step 2) in, connect smoke heat replacing device and residual neat recovering system after rotary hearth furnace 900 DEG C ~ 1200 DEG C high-temperature flue gas out.Heat into stove air and oven dry air through smoke heat replacing device.It is 300 DEG C ~ 700 DEG C from heat-exchanger rig combustion air out and secondary air temperature.Be 750 DEG C ~ 1050 DEG C from heat-exchanger rig oven dry air themperature out, after converting appropriate cold wind as required, receive step 1) and step 2) baking operation.
Wherein, described step 2) in, metallized pellet temperature is 800 DEG C ~ 1000 DEG C.
Finally, the Iron concentrate performance index that described step 3) obtains are: 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%, carries out batch mixing with breeze, unslaked lime by the mass ratio of 86:12:4, and compound moisture control is about 9%, and employing high-pressure ball press obtains length, width and height and is: the pillow shape green-ball of 20mm-30mm-40mm; Green-ball is hot-air seasoning 15min ~ 20min in chain castor dryer, is taken off by moisture content to less than 4%; Then enter in rotary hearth furnace and reduce, at 1280 DEG C, reductase 12 5min ~ 30min, obtains metallized pellet; Metallized pellet temperature is 80 DEG C ~ 950 DEG C; Metallized pellet, after cooling, fragmentation, gravity treatment, magnetic separation, obtains TFe 62.2%, Al
2o
31.8%, SiO
23.8%, Na
2the Iron concentrate of O 0.25%, meets Steel Plant's ingredient requirement.
Embodiment 2:
Adopt TFe 38%, Al
2o
315%, SiO
28%, Na
2the iron red mud of O 3.5%, carries out batch mixing with coal dust, rhombspar by the mass ratio of 85:13:2, and compound moisture control is about 9%, and employing high-pressure ball press obtains length, width and height and is: the pillow shape green-ball of 20mm-30mm-40mm; Green-ball is hot-air seasoning 15min ~ 20min in chain castor dryer, is taken off by moisture content to less than 4%; Then to entering in rotary hearth furnace to reduce, at 1300 DEG C, reducing 30min ~ 35min, obtaining metallized pellet; Metallized pellet temperature is 820 DEG C ~ 970 DEG C; Metallized pellet, after fragmentation, gravity treatment, magnetic separation, obtains TFe 62.6%, Al
2o
31.9%, SiO
23.4%, Na
2the Iron concentrate of O 0.23%, meets Steel Plant's ingredient requirement.
Embodiment 3:
Adopt TFe 40%, Al
2o
314%, SiO
26%, Na
2the iron red mud of O 4.0%, carries out batch mixing with breeze, serpentine by the mass ratio of 86:12:2, and compound moisture control is about 9%, and employing high-pressure ball press obtains length, width and height and is: the pillow shape green-ball of 20mm-30mm-40mm; Green-ball is hot-air seasoning 15min ~ 20min in chain castor dryer, is taken off by moisture content to less than 4%; Then to entering in rotary hearth furnace to reduce, at 1320 DEG C, reductase 12 0min ~ 25min, obtains metallized pellet, and metallized pellet temperature is 850 DEG C ~ 1000 DEG C; Metallized pellet, after fragmentation, gravity treatment, magnetic separation, obtains TFe 63.6%, Al
2o
31.6%, SiO
22.9%, Na
2the Iron concentrate of O 0.27%, meets Steel Plant's ingredient requirement.
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 embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, modify to technical scheme of the present invention or equivalent replacement, do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (13)
1. rotary hearth furnace direct-reduction iron red mud produces a method for Iron concentrate, comprises step:
1) after iron red mud being carried out drying and processing, carry out by a certain percentage with reductive agent preparing burden, mix, pressure ball, obtained green-ball;
2) above-mentioned green-ball, after screening, oven dry, again screening, enters rotary hearth furnace, in rotary hearth furnace, carries out direct-reduction, obtained metallized pellet;
3) above-mentioned metallized pellet is cooled, fragmentation, gravity treatment, after magnetic separation, obtained Iron concentrate;
The performance index of described Iron concentrate are: TFe > 60%, Al
2o
3< 2.0%, SiO
2< 4.0%, Na
2o < 0.3%, part>=70% that granularity is less than 74 μm;
Described iron red mud is that its component and content ratio comprise: TFe 35% ~ 42%, Al through the residue that sorting technology produces in Bayer process aluminum oxide production process
2o
38% ~ 20%, SiO
24% ~ 15% and Na
2o 2% ~ 10%, part>=80% that in described iron red mud, granularity is less than 74 μm;
Step 2) in adopt rotary hearth furnace be divided into five sections of reduction sections, comprise: prereduction section, reduction one section, reduction two sections, soaking one section and soaking two sections, reduction two sections and soaking one section of temperature of the highest temperature are 1300 DEG C ~ 1400 DEG C, and the recovery time is 20 ~ 60 minutes.
2. rotary hearth furnace direct-reduction iron red mud as claimed in claim 1 produces the method for Iron concentrate, it is characterized in that: described step 1) in iron red mud drying and processing adopt chain grate machine, the oven dry thermal source of drying and processing is from the preheated air of 200 DEG C that produce in this production method ~ 900 DEG C, drying time is 10 ~ 40 minutes, iron red mud temperature after oven dry is 50 DEG C ~ 200 DEG C, and the iron red mud moisture content after oven dry is less than 12%.
3. rotary hearth furnace direct-reduction iron red mud as claimed in claim 2 produces the method for Iron concentrate, it is characterized in that: described step 1) in the oven dry thermal source of drying and processing also comprise producer gas.
4. rotary hearth furnace direct-reduction iron red mud as claimed in claim 1 produces the method for Iron concentrate, it is characterized in that: described reductive agent is coke powder or coal dust, granularity≤1mm.
5. rotary hearth furnace direct-reduction iron red mud as claimed in claim 1 produces the method for Iron concentrate, it is characterized in that: the step of described mixing adopt can continuously feeding, continuous discharge mixer carry out batch mixing.
6. rotary hearth furnace direct-reduction iron red mud as claimed in claim 1 produces the method for Iron concentrate, it is characterized in that: described pressure ball step adopts high-pressure ball press, and green-ball diameter is 8mm ~ 40mm.
7. rotary hearth furnace direct-reduction iron red mud as claimed in claim 1 produces the method for Iron concentrate, it is characterized in that: described step 2) in screening and sieve again and all adopt roller screen, the gap of this roller screen is 8 ~ 12mm; On roller screen, pelletizing is screen overflow, and this screen overflow directly enters next step; Particle under roller screen is screen underflow, and this screen underflow returns step 1) in batching step.
8. rotary hearth furnace direct-reduction iron red mud as claimed in claim 1 produces the method for Iron concentrate, it is characterized in that: described step 2) in green-ball dry adopt chain grate machine, dry the preheated air of 200 DEG C ~ 900 DEG C that thermal source produces from present method, drying time is 12 ~ 30 minutes, green-ball temperature after oven dry is 50 DEG C ~ 700 DEG C, and the green-ball moisture content after oven dry is less than 4%.
9. rotary hearth furnace direct-reduction iron red mud as claimed in claim 1 produces the method for Iron concentrate, it is characterized in that: described step 1) in iron red mud drying and processing produce dust and described step 2) in green-ball drying and processing produce dust also to carry out dust removal process, gained dirt ash returns and enters step 1) in burden process.
10. rotary hearth furnace direct-reduction iron red mud as claimed in claim 1 produces the method for Iron concentrate, it is characterized in that: described prereduction section temperature is 900 DEG C ~ 1200 DEG C, reduction one section of temperature is 1200 DEG C ~ 1300 DEG C, reduction two sections of temperature are 1300 DEG C ~ 1400 DEG C, soaking one section of temperature is 1300 DEG C ~ 1400 DEG C, soaking two sections of temperature are 1200 DEG C ~ 1300 DEG C.
11. rotary hearth furnace direct-reduction iron red mud as claimed in claim 1 produce the method for Iron concentrate, it is characterized in that: the gas medium that described rotary hearth furnace adopts is coke-oven gas, high coke mixed gas or producer gas.
12. as arbitrary in claim 1 ~ 11 as described in rotary hearth furnace direct-reduction iron red mud produce the method for Iron concentrate, it is characterized in that: described step 2) in connect smoke heat replacing device, by smoke heat replacing device to entering stove air and oven dry air heating after rotary hearth furnace 900 DEG C ~ 1200 DEG C high-temperature flue gas out.
13. as arbitrary in claim 1 ~ 11 as described in rotary hearth furnace direct-reduction iron red mud produce the method for Iron concentrate, it is characterized in that: described step 2) in the temperature of obtained metallized pellet be 800 DEG C ~ 1000 DEG C.
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| CN103468848B (en) * | 2013-09-06 | 2015-05-06 | 鞍钢股份有限公司 | Method for treating high-iron red mud by high-temperature iron bath |
| CN103589865B (en) * | 2013-10-12 | 2015-03-04 | 酒泉钢铁(集团)有限责任公司 | Method for producing metallized pellets by direct reduction of powdered iron by carbon cycle oxygenation |
| CN104313227B (en) * | 2014-10-29 | 2016-06-15 | 洪阳冶化工程科技有限公司 | Utilize the method and system carrying out carbon thermal reduction containing fusant waste heat |
| CN107287367B (en) * | 2016-03-31 | 2019-04-26 | 鞍钢股份有限公司 | Method for recovering iron by utilizing high-iron red mud |
| CN106352703A (en) * | 2016-08-29 | 2017-01-25 | 宝钢发展有限公司 | Automatic batching system production line system of rotary hearth furnace and automatic batching system production line system control method |
| CN106399676A (en) * | 2016-09-05 | 2017-02-15 | 江苏省冶金设计院有限公司 | Method and system for processing red mud |
| CN106834587B (en) * | 2017-03-15 | 2018-06-19 | 北京安康科创节能环保科技有限公司 | A kind of method of rotary hearth furnace separation production rare earth ferrosilicon alloy |
| 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 |
| CN115261611B (en) * | 2022-08-04 | 2023-05-16 | 天津铁厂有限公司 | Production method of magnesia pellet |
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