CN104630408A - Coal-base low-temperature quick deep reduction method of high-density metallized pellets - Google Patents
Coal-base low-temperature quick deep reduction method of high-density metallized pellets Download PDFInfo
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Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a coal-base low-temperature quick deep reduction method of high-density metallized pellets, which comprises the following steps: uniformly mixing iron ore powder or iron scale to be reduced with carbon powder and an adhesive, and spraying water to prepare phi8-phi20mm pellets; drying, preparing a material to be reduced from the pellets and a reducer, adding the material to be reduced into a flame-isolated rotary kiln, carrying out reduction reaction, and carrying out magnetic separation to obtain the high-grade high-density metallized pellets, of which the grade TFe is greater than or equal to 90%, etaFe is greater than or equal to 93% and the density is greater than or equal to 4.3t/m<3>. The reduction apparatus adopts a flame-isolated rotary kiln, thereby saving the energy. The material reaction is more violent, thereby greatly shortening the reaction time. The high-density metallized pellets with the density of greater than or equal to 4.3t/m<3> have the advantages of uniform particle size, high grade, simple components and trace amounts of harmful elements, and is suitable to be used instead of steel scrap, a diluter and a cooling agent for steelmaking.
Description
Technical field
The invention belongs to metallurgical technology field, particularly relate to a kind of method of coal-based low temperature fast deep reduction high desnity metal pellet.
Background technology
Steel Industrial was greatly develop blast furnace ironmaking in the past, and reduced iron technology is but relatively delayed, China's reduced iron annual production 500000 tons, accounted for world's reduced iron ultimate production less than 1.0%.Along with the ratio of electric furnace high-quality steel improves gradually, reduced iron product has the breach of more than 2,800 ten thousand tons every year, therefore, and about 1,000 ten thousand tons of DRI, HRI product wanting import external every year.Along with China's coking coal reserves are day by day poor and environmental issue is day by day serious, country has put into effect more related industries policy, encourage exploitation, application mill coal resource, carry out technological development and the application such as the non-burnt iron-smelting process such as direct-reduced iron and melting and reducing iron and mini-mill steelmaking, greatly develop the production of electric furnace high-quality steel, so, improve the seed output and quality of reduced iron, reduce energy consumption, reduce CO
2discharge, develop a large amount of low poor thin refractory iron ore of China and iron-containing waste especially as early as possible, make its resource utilization be an extremely urgent cause.
China of today, electric steel ratio is less than 20%, and the exhaust emissions amount of blast furnace-converter steel-making mode is more than 80% of whole steel industry, the exhaust emissions amount of steel scrap (reduced iron)+Electric furnace steel making mode, only accounts for 20% of blast furnace-converter steel-making mode.Solve environmental issue and the development mini-mill steelmaking cause of Steel Industrial energy-saving and emission-reduction carbon drop, advanced person, stable coal based ferrum redactum Technology and the equipments such as just the necessary develop actively size of capacity is large, output investment ratio is low, production run cost is low, workable, energy-saving and emission-reduction, this will meet national conditions development of China's reduced iron industry.
The liquid steel slag density of steel-making is generally at 2.6 ~ 2.8t/m
3, and the reduced iron density that direct-reduction goes out is generally 1.8 ~ 1.9t/m
3, the density after the pre-briquetting reduction of breeze is generally 2.3 ~ 2.5t/m
3add steel stove, under all cannot sinking to slag, swim on slag, be easy to reoxidize, satisfied molten steel recovery rate cannot be obtained, cause reduced iron range of application narrow and small, the factors such as application cost is high, steel mill can not because of the supply of micro-reduced iron, adjust process for making continually, thus cause this just little reduced iron output of China, but occur the result of sales difficulty.
Existing reduced iron method comprises coal-based pot type tunnel furnace method, rotary hearth furnace method, car bottom furnace method, without tank tunnel furnace method, internal combustion type kiln process etc., the shortcoming that these methods exist is: the reduction temperature of coal-based tunnel furnace method is generally 1130 DEG C ~ 1160 DEG C, the reflection of this temperature be the temperature on tunnel kiln top, and the whole section of tunnel furnace, upper and lower temperature has the temperature difference of 50 DEG C, add in fire-resistant can the reduction coal protective layer having one deck 40mm, the temperature difference of about 280 DEG C is had outside middle iron temperature of charge and tank, therefore in fire-resistant can, the reduction actual temperature of iron material is 800 ~ 830 DEG C, so the actual reduction temperature of tunnel furnace method is lower, reaction is not very violent, therefore the recovery time is longer, recovery time is generally at 28 ~ 48h, the reduction temperature of internal combustion type kiln process is generally 1220 ~ 1260 DEG C, and the actual temperature of material is about 950 DEG C, and the recovery time is 6 ~ 8h, because required reduction temperature is too high, causes energy consumption.。
Summary of the invention
The present invention is directed to the deficiency that above-mentioned prior art exists, a kind of method of coal-based low temperature fast deep reduction high desnity metal pellet is provided.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of method of coal-based low temperature fast deep reduction high desnity metal pellet, and step is as follows:
(1) the high grade iron breeze of TFe >=66% to be restored or iron scale are worked into 160 ~ 200 orders, carbon dust and binding agent Homogeneous phase mixing is joined with interior, mixture is by weight percentage: powdered iron ore or iron scale 91 ~ 94%, inside joins carbon dust 5.0 ~ 8.0%, binding agent 1.0 ~ 3.0%; Then water spray causes the pelletizing of ￠ 8 ~ ￠ 20mm;
(2) wet bulb of step (1) group is dried under 50 ~ 280 DEG C of conditions, make its moisture content < 0.5%, intensity >=25N/ ball;
(3) pelletizing of step (2) and reductive agent are made material to be restored, the consumption of described reductive agent is powdered iron ore described in step (1) or iron scale weight 30 ~ 40%;
(4) added by the material to be restored of step (3) in flame-insulating type revolution preheating section of kiln, directly sinter under 800 ~ 950 DEG C of conditions, sintering time is 20 ~ 25min, makes pellet strength >=300N/ ball;
(5) add in the high temperature section of flame-insulating type rotary kiln by the material to be restored of step (4), under 1080 ~ 1100 DEG C of conditions, carry out reduction reaction, the recovery time is 2.5 ~ 3h;
(6) after completion of the reaction; after the material of step (5) is cooled to 200 DEG C under anoxybiotic protection; material is taken out, adopts dry type magnetic separation to be separated with metallized pellet by reductive agent tail powder, obtain grade TFe>=90%, η Fe>=93%, density>=4.3t/m
3higher-grade, highdensity metallized pellet.
The invention has the beneficial effects as follows:
1, the reduction apparatus that the present invention uses is flame-insulating type rotary kiln, preheating section, the continuous external heat of high temperature section entire body, and high-temperature zone temperature continous-stable reduces the temperature difference, save energy; And rotary kiln keeps rotating state, reduced material constantly rotates in rotary kiln, and therefore reaction mass temperature can reach 1060 ~ 1100 DEG C, and reaction is more violent, Reaction time shorten greatly; And bonding phenomenon can not be there is in metallized pellet.
2, reaction mass of the present invention remains higher reduction temperature, and in short period of time reaction, metallized pellet, by drastic reduction, namely presents spongy pore, and after compress, shrinking, the density of metallized pellet improves greatly, generally>=4.3t/m
3.
3, density>=4.3t/m that the inventive method is obtained
3high desnity metal pellet product because epigranular, of high grade, composition are simple, S, P and harmful element content trace, be suitable for very much substituting the steel scrap of steel-making, thinner and refrigerant.
On the basis of technique scheme, the present invention can also do following improvement.
Further, joining carbon dust in described in step (1) is the non-coke powder such as hard coal, bituminous coal, coke powder, blue carbon dust or wood charcoal powder, requires ash content≤12%, S≤0.5%, fineness-100 order.
Further, the binding agent described in step (1) is organic binder bond, is preferably starch, dextrin, malt sugar, papermaking wastewater, sodium humate or water-soluble poval, fineness-120 order after processing.
Further, the reductive agent described in step (3) is the mixture of reduction coal and sweetening agent, is reduction coal 90 ~ 100%, sweetening agent 0 ~ 10% by weight percentage.
Further, described sweetening agent is lime powder; Described reduction coal is hard coal, bituminous coal, coke powder, blue carbon or charcoal, and granularity is 0 ~ 25mm, and its composition is by weight percentage: fixed carbon >=48%, ash≤45%, S≤1.0%, remainder are fugitive constituent, ash melting point >=1150 DEG C.
Further, the anoxybiotic protection described in step (6) is that airtight cooling, nitrogen protection cooling or coal dust cover cooling.
Further, hot material after the reduction that step (6) obtains, can hot sieve out reductive agent tail powder after, obtain high temperature, higher-grade, the highdensity thermal state metal pellet of < 1000 DEG C, directly carry out molten point or steel-making.
Further, described flame-insulating type rotary kiln comprises cylinder of rotary kiln, feeding device, drive unit, the first backing ring device and the second backing ring device, described cylinder of rotary kiln is supported on described drive unit, the first backing ring device and the second backing ring device, the first heating furnace body is provided with between described drive unit and the first backing ring device, be provided with the second heating furnace body between described first backing ring device and the second backing ring device, the both sides of described first heating furnace body and the second heating furnace body are respectively equipped with the first burner group and the second burner group;
Described cylinder of rotary kiln comprises preheating section, high temperature section and cooling section from front to back successively, described high temperature section is located within described first heating furnace body and the second heating furnace body, described feeding device is connected mutually with described preheating section front end, and described cooling section rear end is provided with discharge port;
Described cylinder of rotary kiln is set with cylinder body outer wall between described first heating furnace body and the second heating furnace body, supporting tube is evenly equipped with between described cylinder body outer wall and cylinder of rotary kiln, between cylinder body outer wall and cylinder of rotary kiln, form exhaust gases passes, described cylinder body outer wall is supported on described first backing ring device;
The axis of described cylinder of rotary kiln and sea line angle are 2.5 ° ~ 5 °, and described preheating section is higher than cooling section.
Described first backing ring device comprises backing ring, supporting seat and backing drum, and described backing ring is located at cylinder body outer wall periphery, and described backing drum is located on described supporting seat, and is supported on described backing ring bottom.
Described preheating section outside is provided with off-gas recovery pipe, flame small transfer line of discharging fume is provided with between described off-gas recovery pipe and cylinder of rotary kiln, the front end of described cylinder of rotary kiln is provided with smoke evacuation guard shield, described smoke evacuation flame small transfer line is provided with radial ventilation mouth in smoke evacuation guard shield, and described smoke evacuation guard shield is provided with exhaust port; Described drive unit is supported on described off-gas recovery pipe.
Described feeding device comprises loading hopper and worm conveyor, and the outlet of described worm conveyor reaches in described cylinder of rotary kiln, above described outlet, be provided with gas exit.
Described cooling section is provided with interchanger, described interchanger comprises cooling section rotary kiln outer wall, heat transfer tube, hot blast guard shield and cold wind guard shield, the inwall of described cylinder of rotary kiln is located at by described heat transfer tube, described cooling section rotary kiln outer wall is located at the outside of described cylinder of rotary kiln, the front and back ends that described cooling section rotary kiln outer wall is located at respectively by described hot blast guard shield and cold wind guard shield is outside, and described heat transfer tube two ends are respectively equipped with the radial ventilation mouth through described cylinder of rotary kiln.
Described burner group comprises horizontally disposed multiple burner, and described burner is externally connected to combustion air pipeline and gas line.
The technique effect of above-mentioned further scheme is adopted to be adopt preheating section, high temperature section entire body continuous external heat flame-insulating type coal-based rotary kiln device, achieve the continous-stable of high-temperature zone temperature; The kiln rotated is airtight rotary kiln that is airtight, malleation abrim, reduction coal adds in rotary kiln, under the high temperature conditions, volatilize rapidly coal gas, and after metallized pellet comes out of the stove, partial particulate coal is had to remain, do not participate in reaction completely, therefore can reclaim high PG from kiln hood, in whole rotary kiln, sufficient reducing atmosphere abrim always, meets the condition of ferric oxide drastic reduction completely.
Accompanying drawing explanation
Fig. 1 is longitudinal profile schematic diagram of the present invention;
Fig. 2 is the A-A direction sectional schematic diagram of Fig. 1;
Fig. 3 is the B-B direction sectional schematic diagram of Fig. 1;
Fig. 4 is the C-C direction sectional schematic diagram of Fig. 1;
Fig. 5 is the D-D direction sectional schematic diagram of Fig. 1;
Fig. 6 is the E-E direction sectional schematic diagram of Fig. 1;
In figure, 1, cylinder of rotary kiln; 2, loading hopper; 3, worm conveyor; 4, drive unit; 5, the first backing ring device; 6, the second backing ring device; 7, the first heating furnace body; 8, the second heating furnace body; 9, the first burner group; 10, the second burner group; 11, preheating section; 12, high temperature section; 13, cooling section; 14, cylinder body outer wall; 15, supporting tube; 16, exhaust gases passes; 17, backing ring; 18, supporting seat; 19, backing drum; 20, off-gas recovery pipe; 21, smoke evacuation flame small transfer line; 22, smoke evacuation guard shield; 23, radial ventilation mouth; 24, exhaust port; 25, gas exit; 26, cooling section rotary kiln outer wall; 27, heat transfer tube; 28, hot blast guard shield; 29, cold wind guard shield; 30, combustion air pipeline; 31, gas line; 32, discharge port.
Embodiment
Be described principle of the present invention and feature below in conjunction with example, example, only for explaining the present invention, is not intended to limit scope of the present invention.
A kind of entire body external heat flame-insulating type rotary kiln, comprise cylinder of rotary kiln 1, feeding device, drive unit 4, first backing ring device 5 and the second backing ring device 6, its special character is, described cylinder of rotary kiln 1 is supported on described drive unit 4, on first backing ring device 5 and the second backing ring device 6, the first heating furnace body 7 is provided with between described drive unit 4 and the first backing ring device 5, the second heating furnace body 8 is provided with between described first backing ring device 5 and the second backing ring device 6, the both sides of described first heating furnace body 7 and the second heating furnace body 8 are respectively equipped with the first burner group 9 and the second burner group 10,
Described cylinder of rotary kiln 1 comprises preheating section 11, high temperature section 12 and cooling section 13 from front to back successively, described high temperature section 12 is located within described first heating furnace body 7 and the second heating furnace body 8, described feeding device is connected mutually with described preheating section 11 front end, and described cooling section 13 rear end is provided with discharge port 32;
Described cylinder of rotary kiln 1 is set with cylinder body outer wall 14 between described first heating furnace body 7 and the second heating furnace body 8, supporting tube 15 is evenly equipped with between described cylinder body outer wall 14 and cylinder of rotary kiln 1, between cylinder body outer wall 14 and cylinder of rotary kiln 1, form exhaust gases passes 16, described cylinder body outer wall 14 is supported on described first backing ring device 5;
The axis of described cylinder of rotary kiln 1 and sea line angle are 2.5 ° ~ 5 °, and described preheating section 11 is higher than cooling section 13.
Described first backing ring device 5 comprises backing ring 17, supporting seat 18 and backing drum 19, and it is peripheral that described backing ring 17 is located at cylinder body outer wall 14, and described backing drum 19 is located on described supporting seat 18, and is supported on described backing ring 17 bottom.
Described preheating section 11 outside is provided with off-gas recovery pipe 20, flame small transfer line 21 of discharging fume is provided with between described off-gas recovery pipe 20 and cylinder of rotary kiln 1, the front end of described cylinder of rotary kiln 1 is provided with smoke evacuation guard shield 22, described smoke evacuation flame small transfer line 21 is provided with radial ventilation mouth 23 in smoke evacuation guard shield 22, and described smoke evacuation guard shield 22 is provided with exhaust port 24; Described drive unit 4 is supported on described off-gas recovery pipe 20.
Described feeding device comprises loading hopper 2 and worm conveyor 3, and the outlet of described worm conveyor 3 reaches in described cylinder of rotary kiln 1, is provided with gas exit 25 above described outlet.
Described cooling section 13 is provided with interchanger, described interchanger comprises cooling section rotary kiln outer wall 26, heat transfer tube 27, hot blast guard shield 28 and cold wind guard shield 29, the inwall of described cylinder of rotary kiln 1 is located at by described heat transfer tube 27, described cooling section rotary kiln outer wall 26 is located at the outside of described cylinder of rotary kiln 1, the front and back ends that described cooling section rotary kiln outer wall 26 is located at respectively by described hot blast guard shield 28 and cold wind guard shield 29 is outside, and described heat transfer tube 27 two ends are respectively equipped with the radial ventilation mouth 23 through described cylinder of rotary kiln 1.
Described burner group comprises horizontally disposed multiple burner, and described burner is externally connected to combustion air pipeline 30 and gas line 31.
The flame-insulating type rotary kiln of ￠ 330 × 3000mm is all adopted in the embodiment of the present invention.
Embodiment 1
A method for coal-based low temperature fast deep reduction high desnity metal pellet, step is as follows:
(1) iron scale (iron scale) of TFe:69.28% to be restored is dried, be worked into 160 ~ 180 orders, carbon dust and binding agent Homogeneous phase mixing is joined with interior, mixture is by weight percentage: iron scale 91%, bituminous coal powder (fixed carbon is 56.12%, ash content is 9.8%, fugitive constituent is 32.89%, S be 0.5%) 6.0%, dextrine powder 3.0%; Then water spray causes the pelletizing of ￠ 8 ~ ￠ 16mm;
(2) 2h is dried under 105 DEG C of conditions in the wet bulb of step (1) group, surveying pellet strength is 26N/ ball;
(3) pelletizing of step (2) and the blue carbon dust (its index is in table 1) of 0 ~ 15mm are made material to be restored, the consumption of described blue carbon dust is 30% of iron scale weight described in step (1); In described reductive agent, reduction coal accounts for 100%;
(4) added by the material to be restored of step (3) in flame-insulating type revolution preheating section of kiln, directly sinter under 800 DEG C of conditions, sintering time is 20 ~ 25min, makes pellet strength >=300N/ ball;
(5) add in the high temperature section of flame-insulating type rotary kiln by the material to be restored of step (4), under 1085 DEG C of conditions, carry out reduction reaction, the recovery time is 2.5h;
(6) after completion of the reaction; after the material of step (5) is cooled to 200 DEG C under coal dust covering protection, material is taken out, adopt dry type magnetic separation to be separated with metallized pellet by reductive agent tail powder; obtain highdensity metallized pellet, product index is in table 2.
Table 1
Table 2
| TFe(％) | ηFe(％) | C(％) | S(％) | P(％) | Density (t/m 3) | Granularity (mm) |
| 91.16 | 93.12 | 2.12 | 0.073 | 0.072 | 4.36 | ￠6～14 |
Embodiment 2
A method for coal-based low temperature fast deep reduction high desnity metal pellet, step is as follows:
(1) powdered iron ore of TFe:68.45% to be restored dried, be worked into 160 ~ 180 orders, join carbon dust and binding agent Homogeneous phase mixing with interior, mixture is by weight percentage: iron scale 91.2%, pulverized anthracite 7.0%, Sodium salts humic acids 1.8%; Then water spray causes the pelletizing of ￠ 8 ~ ￠ 16mm;
(2) 2h is dried under 105 DEG C of conditions in the wet bulb of step (1) group, surveying pellet strength is 28N/ ball;
(3) pelletizing of step (2) and 0 ~ 8mm pulverized anthracite (fixed carbon 65%), lime powder are made material to be restored, the consumption of described pulverized anthracite is 40% of iron scale weight described in step (1); In described reductive agent, reduction coal accounts for 90%, sweetening agent accounts for 10%;
(4) added by the material to be restored of step (3) in flame-insulating type revolution preheating section of kiln, directly sinter under 900 DEG C of conditions, sintering time is 20 ~ 25min, makes pellet strength >=300N/ ball;
(5) add in the high temperature section of flame-insulating type rotary kiln by the material to be restored of step (4), under 1090 DEG C of conditions, carry out reduction reaction, the recovery time is 3.0h;
(6) after completion of the reaction; after the material of step (5) is cooled to 200 DEG C under coal dust covering protection, material is taken out, adopt dry type magnetic separation to be separated with metallized pellet by reductive agent tail powder; obtain highdensity metallized pellet, product index is in table 3.
Table 3
| TFe(％) | ηFe(％) | C(％) | S(％) | P(％) | Density (t/m 3) | Granularity (mm) |
| 92.23 | 93.07 | 1.98 | 0.065 | 0.072 | 4.53 | ￠6～14 |
Embodiment 3
A method for coal-based low temperature fast deep reduction high desnity metal pellet, step is as follows:
(1) the superfinishing powdered iron ore of TFe:71.32% to be restored dried, be worked into 160 ~ 180 orders, join carbon dust and binding agent Homogeneous phase mixing with interior, mixture is by weight percentage: superfinishing powdered iron ore 93%, wood charcoal powder 5.0%, dextrine powder 2.0%; Then water spray causes the pelletizing of ￠ 8 ~ ￠ 16mm;
(2) 2h is dried under 105 DEG C of conditions in the wet bulb of step (1) group, surveying pellet strength is 28N/ ball;
(3) pelletizing of step (2) and the blue carbon dust (its index is in table 4) of 0 ~ 15mm are made material to be restored, the consumption of described blue carbon dust is 40% of superfinishing powdered iron ore weight described in step (1); In described reductive agent, reduction coal accounts for 100%;
(4) added by the material to be restored of step (3) in flame-insulating type revolution preheating section of kiln, directly sinter under 950 DEG C of conditions, sintering time is 20 ~ 25min, makes pellet strength >=300N/ ball;
(5) add in the high temperature section of flame-insulating type rotary kiln by the material to be restored of step (4), under 1095 DEG C of conditions, carry out reduction reaction, the recovery time is 2.8h;
(6) after completion of the reaction; after the material of step (5) is cooled to 200 DEG C under coal dust covering protection, material is taken out, adopt dry type magnetic separation to be separated with metallized pellet by reductive agent tail powder; obtain highdensity metallized pellet, product index is in table 5.
Table 4
Table 5
| TFe(％) | ηFe(％) | C(％) | S(％) | P(％) | Density (t/m 3) | Granularity (mm) |
| 94.12 | 93.62 | 2.09 | 0.066 | 0.070 | 4.86 | ￠6～14 |
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a method for coal-based low temperature fast deep reduction high desnity metal pellet, it is characterized in that, step is as follows:
(1) the high grade iron breeze of TFe >=66% to be restored or iron scale are worked into 160 ~ 200 orders, carbon dust and binding agent Homogeneous phase mixing is joined with interior, mixture is by weight percentage: powdered iron ore or iron scale 91 ~ 94%, inside joins carbon dust 5.0 ~ 8.0%, binding agent 1.0 ~ 3.0%; Then water spray causes the pelletizing of ￠ 8 ~ ￠ 20mm;
(2) wet bulb of step (1) group is dried under 50 ~ 280 DEG C of conditions, make its moisture content < 0.5%, intensity >=25N/ ball;
(3) pelletizing of step (2) and reductive agent are made material to be restored, the consumption of described reductive agent is powdered iron ore described in step (1) or iron scale weight 30 ~ 40%;
(4) added by the material to be restored of step (3) in flame-insulating type revolution preheating section of kiln, directly sinter under 800 ~ 950 DEG C of conditions, sintering time is 20 ~ 25min, makes pellet strength >=300N/ ball;
(5) add in the high temperature section of flame-insulating type rotary kiln by the material to be restored of step (4), under 1080 ~ 1100 DEG C of conditions, carry out reduction reaction, the recovery time is 2.5 ~ 3h;
(6) after completion of the reaction; after the material of step (5) is cooled to 200 DEG C under anoxybiotic protection; material is taken out, adopts dry type magnetic separation to be separated with metallized pellet by reductive agent tail powder, obtain grade TFe>=90%, η Fe>=93%, density>=4.3t/m
3higher-grade, highdensity metallized pellet.
2. method according to claim 1, is characterized in that, joining carbon dust in described in step (1) is hard coal, bituminous coal, coke powder, blue carbon dust or wood charcoal powder, requires ash content≤12%, S≤0.5%, fineness-100 order.
3. method according to claim 1, is characterized in that, the binding agent described in step (1) is organic binder bond.
4. the method according to claim 1 or 3, is characterized in that, described binding agent is starch, dextrin, malt sugar, papermaking wastewater, sodium humate or water-soluble poval, fineness-120 order.
5. method according to claim 1, is characterized in that, the reductive agent described in step (3) is the mixture of reduction coal and sweetening agent, is reduction coal 90 ~ 100%, sweetening agent 0 ~ 10% by weight percentage.
6. method according to claim 5, is characterized in that, described sweetening agent is lime powder; Described reduction coal is hard coal, bituminous coal, coke powder, blue carbon or charcoal, and granularity is 0 ~ 25mm, and its composition is by weight percentage: fixed carbon >=48%, ash≤45%, S≤1.0%, remainder are fugitive constituent, ash melting point >=1250 DEG C.
7. method according to claim 1, is characterized in that, the anoxybiotic protection described in step (6) is that airtight cooling, nitrogen protection cooling or coal dust cover cooling.
8. method according to claim 1, it is characterized in that, described flame-insulating type rotary kiln comprises cylinder of rotary kiln, feeding device, drive unit, first backing ring device and the second backing ring device, described cylinder of rotary kiln is supported on described drive unit, on first backing ring device and the second backing ring device, the first heating furnace body is provided with between described drive unit and the first backing ring device, the second heating furnace body is provided with between described first backing ring device and the second backing ring device, the both sides of described first heating furnace body and the second heating furnace body are respectively equipped with the first burner group and the second burner group,
Described cylinder of rotary kiln comprises preheating section, high temperature section and cooling section from front to back successively, described high temperature section is located within described first heating furnace body and the second heating furnace body, described feeding device is connected mutually with described preheating section front end, and described cooling section rear end is provided with discharge port;
Described cylinder of rotary kiln is set with cylinder body outer wall between described first heating furnace body and the second heating furnace body, supporting tube is evenly equipped with between described cylinder body outer wall and cylinder of rotary kiln, between cylinder body outer wall and cylinder of rotary kiln, form exhaust gases passes, described cylinder body outer wall is supported on described first backing ring device;
The axis of described cylinder of rotary kiln and sea line angle are 2.5 ° ~ 5 °, and described preheating section is higher than cooling section.
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| CN104878147A (en) * | 2015-06-04 | 2015-09-02 | 中冶南方工程技术有限公司 | Method for making iron by smelting reduction |
| CN105648132A (en) * | 2016-01-25 | 2016-06-08 | 唐竹胜 | Coal-based muffle type rotary kiln and method for low-temperature deep and rapid reduction of iron |
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| CN1074714A (en) * | 1993-03-18 | 1993-07-28 | 冶金工业部钢铁研究总院 | Cold concretion high carbon content iron mineral ball group for iron-smelting |
| CN102758046A (en) * | 2012-03-20 | 2012-10-31 | 沈阳博联特熔融还原科技有限公司 | Shortened production equipment and method of coal-based direct reduced iron |
| CN102936653A (en) * | 2012-11-23 | 2013-02-20 | 沈阳博联特熔融还原科技有限公司 | Method for reducing high-density metallized pellet |
| CN103627835A (en) * | 2013-11-12 | 2014-03-12 | 金川集团股份有限公司 | Method for treating nickel smelting furnace slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104878147A (en) * | 2015-06-04 | 2015-09-02 | 中冶南方工程技术有限公司 | Method for making iron by smelting reduction |
| CN105648132A (en) * | 2016-01-25 | 2016-06-08 | 唐竹胜 | Coal-based muffle type rotary kiln and method for low-temperature deep and rapid reduction of iron |
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