CN1248634A - Final reduction apparatus and method for fused reduction iron-smelting - Google Patents
Final reduction apparatus and method for fused reduction iron-smelting Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000003723 Smelting Methods 0.000 title claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 112
- 239000002893 slag Substances 0.000 claims abstract description 62
- 229910052742 iron Inorganic materials 0.000 claims abstract description 54
- 239000000571 coke Substances 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 238000010079 rubber tapping Methods 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 230000003068 static effect Effects 0.000 claims abstract description 6
- 239000011261 inert gas Substances 0.000 claims abstract description 5
- 238000006722 reduction reaction Methods 0.000 claims description 96
- 239000003245 coal Substances 0.000 claims description 31
- 239000007789 gas Substances 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000003034 coal gas Substances 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- 238000004939 coking Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000011946 reduction process Methods 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 abstract 1
- LLPOLZWFYMWNKH-CMKMFDCUSA-N hydrocodone Chemical compound C([C@H]1[C@H](N(CC[C@@]112)C)C3)CC(=O)[C@@H]1OC1=C2C3=CC=C1OC LLPOLZWFYMWNKH-CMKMFDCUSA-N 0.000 abstract 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 24
- 239000008188 pellet Substances 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000001465 metallisation Methods 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 208000035699 Distal ileal obstruction syndrome Diseases 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
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- 239000002817 coal dust Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 229910001873 dinitrogen Inorganic materials 0.000 description 1
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- 238000009776 industrial production Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Abstract
The present invention belongs to the field of smelting molten iron by using direct reduction method, mainly is suitable for final reduction of two-step melt-reduction iron-smelting process. The described final reduction uses the prereduced ore as raw material, and is implemented in fixed vertical final reduction furnace, and in the course of final reduction, the material in furnace is divided into three layers of solid packed bed, liquid slag-coke fluid bed,and static iron cake and melted iron layer. Coal-oxygen and inert gas are respectively blown from the ejection gun positioned in lower portion of the reduction furnace and the jet nozzle positioned in bottom portion so as to aculerate and intensify the reduction process. Besides, it adopts hydrocone type slagging and tapping to regulate tap hole and slag hole height, and control stable level of melted iron layer in the furnace and slag-coke layer level.
Description
The invention belongs to the field of smelting molten iron by a direct reduction method. It is mainly suitable for smelting molten iron directly with iron ore powder and coal powder.
The smelting reduction process is one important new metallurgical process and features that non-coking coal is used as the primary energy source and reductant, and iron oxide is reduced in molten state. It is the development direction of iron-making industry in the future, is known as the emerging iron-making process in the 21 st century, and is also an important field for competitive research and development of iron and steel industry in various countries at present.
In the prior art, the more well-known smelting reduction processes mainly include: the COREX process (CN1042185A), the DIOS process (CN1054446), the Hismelt process (CN07102252), the AISI process (CN1071202), the PJV process (CN86100138) and the like, and only the CPREX process realizes industrial production. Other processes are also in the industrial or pilot plant phase.
Most smelting reduction iron-making processes adopt: the two-step reduction process of pre-reduction and final reduction. Namely, the reduction process in which the upper pre-reduction is mainly based on indirect reduction reaction and the lower final reduction is mainly based on direct reduction. According to the degree of pre-reduction, various processes for smelting and reducing coal iron developed in the world at present can be divided into the following two major types:
(1) the process with high pre-reduction degree and low post combustion rate comprises the following steps: which is typically represented by the COREX process. The upper part of the COREX process adopts a shaft furnace for pre-reduction, and utilizes high-concentration (CO + H) generated by a final reduction furnace2Not less than 95 percent) of the coal gas reduces the lump ore, the pellets and the sinter ore to the metallization rate not less than 90 percent, and then the reduced iron is melted and reduced into iron in a final reduction furnaceAnd (3) water.
(2) The processes with low pre-reduction degree and high post-combustion rate, such as DIOS process, AISI process, Hismelt process and the like belong to the type. The method is basically characterized in that an iron bath (or slag bath) furnace with the characteristic of uniform mixing is adopted as a reactor in a final reduction furnace, FeO is directly reduced by utilizing C, and the heat required by the direct reduction is compensated through the heat of secondary combustion. Therefore, the degree of pre-reduction of ores at the upper part of the process is lower, generally about 30 percent, and only Fe is used3O4Or Fe2O3Reducing the product to FeO; and then the molten iron is melted and reduced into molten iron in a final reduction furnace. In order to ensure the heat required for the final reduction, the post-combustion rate of the furnace gas (i.e. CO + H) is required2O/CO+CO2+H2+H2The O is more than or equal to 50-60 percent, and lower coal consumption can be obtained.
Because the COREX process mainly completes the reduction of the iron ore by gas-solid phase indirect reduction reaction, the consumption of the reducing gas is high, and the energy consumption is higher; and the production efficiency is low and the investment cost is high due to the limitation of low heat transfer and mass transfer rate of the gas-solid reaction.
In various smelting reduction processes using a process route of high post-combustion rate and low pre-reduction degree represented by a DIOS process, the gas phase at the upper part of a final reduction furnace is required to have higher oxidation potential (high post-combustion rate), so that the reduction potential of slag and iron phase at the lower part is difficult to control. Therefore, the strong erosion of the furnace lining by the high-temperature high FeO slag cannot be avoided. At present, no process can reach the industrialized production condition.
The invention aims to provide a final reduction device and a method thereof in a smelting reduction iron-making method adopting a pre-reduction and final reduction two-step method.
The iron-smelting by smelting reduction is to use the iron-containing materials including carbon-containing pellets, iron lump ores, common sinter ores and pellets as raw materials, and coal as energy and reducing agent, and to directly iron by adopting a two-step pre-reduction and final reduction method. The pre-reduction is carried out in a pre-reduction shaft furnace, the medium reduction degree is adopted, namely the metallization rate of the reduced ore is 50-80%, and the discharge temperature of the pre-reduced ore from the pre-reduction shaft furnace is 800-.
The pre-reduced ore passes through a discharger and a blanking pipe and enters the furnace through a pre-reduced ore inlet 3 of the fixed vertical reduction furnace for final reduction.
The present invention will now be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a final reduction apparatus for iron making by smelting reduction according to the present invention.
As shown in the figure, the final reduction device is a fixed vertical final reduction furnace with the upper and lower consistent inner diameters of a hearth, and the furnace comprises a furnace body 1, a small tapping well 14, a small tapping well 15, a tapping hole 8, a tapping hole 7, an emergency treatment hole 9, a furnace cover 16, an ore and solvent inlet 5, a pre-reduced ore inlet 3, a coal gas outlet 4, a pressure balance pipe 6, a coal oxygen spray gun 2 and a bottom blowing nozzle 10. The small tapping well 14 and the small slag discharging well 15 are communicated and connected with the bottom of a hearth of the furnace body 1, the tapping hole 8 and the slag discharging hole 7 are respectively communicated with the small tapping well 14 and the small slag discharging well 15, the coal oxygen spray gun 2 is arranged on the lower furnace wall of the furnace body 1, the bottom blowing nozzle 10 is arranged at the bottom of the hearth of the furnace body 1, the small slag discharging well 15 is communicated with the upper part of the hearth of the furnace body 1 through a pressure balance pipe 6, and the pre-reduced ore inlet 3, the coal gas outlet 4, the ore and solvent inlet 5 are respectively arranged on a furnace cover 16; the pre-reduction ore inlet 3 is connected with the pre-reduction furnace through a feeding pipe, the gas outlet 4 is connected with the gas inlet of the pre-reduction furnace through a gas conveying pipeline and a dust remover, and the ore and solvent inlet 5 is connected with the raw material bin through a conveying pipe. The tap hole 8 and the tap hole 7 are vertically adjustable in height. The number of the coal oxygen spray guns is more than 2.
The final reduction method for smelting reduction ironmaking takes the pre-reduced ore pre-reduced by the pre-reduction furnace as a raw material, the metallization rate of the pre-reduced ore is 50-80%, the discharge temperature of the pre-reduced ore is 800-850 ℃, and the pre-reduced ore enters the fixed vertical final reduction furnace from the pre-reduced ore inlet 3 for final reduction.
In the final reduction process, the materials in the hearth of the fixed vertical reduction furnace are divided into three layers: the upper layer is a solid filling bed 13 consisting of pre-reduced ores, slagging accessories (solvents) and coal briquettes, the middle layer is a liquid slag-coking fluidized bed layer 12 for supporting the solid filling bed, and the lower layer is a static slag and molten iron layer 11.
In the solid packed bed 13, countercurrent heat exchange is carried out between the pre-reduced ore and the high-temperature furnace gas, the pre-reduced ore absorbs the heat of the furnace gas, the temperature is raised, and the reduction reaction is completed:
the reduction reaction temperature is 1100-1300 ℃. For the carbonaceous pellets, the self-reduction reaction will be rapidly completed starting at 1170 ℃:
the reaction strongly absorbs heat, so that the temperature of the furnace gas is reduced. In the bed layer, the carbon-containing pellets with a certain pre-reduction degree are further reduced, so that the metallization rate of the pellets reaches 85-90%.
The pre-reduced pellets further reduced by the furnace gas are gradually reduced to the surface of the liquid slag-coke fluidized bed along with the melting of the furnace material, the temperature is increased to 1300 ℃ and 1400 ℃, and the pre-reduced pellets are melted into the liquid slag-coke fluidized bed 12. Due to the intense stirring in the bed, the heat and mass transfer rate is accelerated, and the slag is rapidly and uniformly mixed. Carrying out final reduction and C infiltration reactions between the high-temperature slag and the incandescent coke:
meanwhile, in the liquid slag-coking bed, the stirring effect of a large amount of reducing gas on the molten slag can be utilized to quickly improve the heat transfer in the bed layer and the uniform mixing degree of a molten pool, so that the pre-reduction is quickly melted; and a large amount of coke in the slag layer is utilized to inhibit the generation of foam, the FeO in the slag is controlled to be less than or equal to 3 percent, and the erosion of the furnace lining by high-temperature liquid FeO slag is avoided.
At the lower part of the liquid slag-coke fluidized bed 12, coal powder and oxygenare simultaneously injected into the slag bath through a coal-oxygen lance 2. The injection amount of the coal powder is 600-650kg/T, and the injection amount of the oxygen is 500-550Nm3T, coal- -oxygenSubmerged combustion is carried out in the form of bubbles in a high-temperature liquid slag-coke fluidized bed to generate high-concentration (CO + H)2Not less than 90 percent), and the gas escapes from the liquid slag in the form of bubbles-a coke flow bed, enters a solid packed bed and carries out countercurrent heat exchange with the pre-reduced ore. When the reducing coal gas escapes from the liquid slag-coke fluidized bed in the form of bubbles, the generation of low-temperature volatile matters (such as tar, asphalt and the like) is avoided; meanwhile, the liquid slag-coke fluidized bed and the solid packed bed on the upper part of the fluidized bed can generate good filtering and dust removing effects on the reduced coal gas.
The unburnt coal powder is filtered by liquid slag and suspended in the molten pool to continue reacting with oxygen bubbles or FeO-generated slag, and generated coal gas floats upwards and is discharged.
In the liquid slag-coke fluidized bed 12, the weight ratio of the solid coke to the liquid slag is 0.5-1.0, so as to ensure the support of the solid packed bed 13 and ensure the uniform distribution of the gas flow; in addition, the existence of the excessive coke ensures that the layer has high reduction potential, ensures that FeO in the slag is less than or equal to 3 percent, and avoids the erosion of high FeO slag to a furnace lining. The temperature of the liquid slag-coking fluidized bed layer is 1400 ℃ and 1500 ℃.
The part below the coal oxygen lance is the stationary iron slag and the molten iron layer 11, where the iron slag is separated. Inert gas is blown into the furnace through a bottom blowing nozzle 10 at the bottom of the furnace to stir the molten pool. The intensity of the injected inert gas is 0.08-0.2Nm3and/T.min, on one hand, uniform slag and iron components and temperature are ensured through stirring, and on the other hand, gas flow in the liquid slag-coke fluidized bed is uniformly distributed through stirring, so that uniform gas-solid phase reduction reaction in a solid filling bed on the upper part of the coke fluidized bed is ensured. Due to the stirring effect, the following reactions between iron slag are promoted:
After the reduction reaction of the liquid slag-coke fluidized bed, the settled iron drops and the liquid slag enter the lower static iron slag and the lower static iron melt layer, and the slag and iron are separated by means of the gravity and the density difference of the iron drops and the liquid slag and flow out of the tap hole 8 and the tap hole 7 respectively.
The final liquid slag and iron are continuously or discontinuously discharged from the slag outlet 7 and the iron outlet 8 by a siphon method through the slag outlet small well 15 and the iron outlet small well 14. According to the pressure of the hearth, the heights of the tap hole 8 and the slag hole 7 can be adjusted through the pressure balance pipe 6, and the stable height of a static molten iron layer in the furnace is controlled. The slag discharging small well is communicated with the upper part of the furnace body, so that the furnace pressure and the pressure in the small well are kept balanced. The height of the slag-coke layer in the furnace is controlled and kept stable by adjusting the height of the slag discharging position.
Compared with the prior art, the invention has the following advantages:
(1) the process skillfully combines the iron (slag) bath final reduction reaction principle with uniform mixing characteristics and the mechanism of the reduction reaction by the countercurrent heat exchange of the coke solid packed bed with high reduction potential, constructs a three-layer bed process structure of 'pre-raw pellet solid packed bed-slag coke fluidized bed-static slag iron layer', and carries out relatively optimized reduction reaction according to different characteristics and temperatures of the reduction reaction, thereby achieving the purposes of improving the production efficiency and avoiding the serious erosion of a furnace lining.
(2) In the solid packed bed, the partially pre-reduced ore is further pre-reduced by utilizing the physical heat of the ascending flue gas, so that the metallization rate is improved. For the carbon-containing pellets, the rapid self-reduction reaction under the high temperature condition (1100-1300 ℃) can be realized, and the metallization rate of the pellets is improved to 85-90%. Meanwhile, the temperature of furnace gas is reduced to 1000-1100 ℃, the utilization rate of flue gas is improved, and the reduction of coal consumption is facilitated.
(3) In the liquid slag-coke fluidized bed, the stirring effect of a large amount of reducing gas on molten slag is utilized to rapidly improve the heat transfer and mass transfer efficiency in the bed layer and the mixing degree of a molten pool, so that the pre-reduced ore is rapidly melted. And a large amount of coke in the slag layer is utilized to inhibit the generation of foam slag, and FeO in the slag is controlled to be less than or equal to 3 percent, so that the erosion of high-temperature liquid FeO slag on a furnace lining is avoided.
(4) The slag-coke fluidized bed is immersed and blown to generate reducing gas in the liquid smelting pool. Because the reaction temperature ishigh, the low-temperature volatile matter of the coal can be avoided, the combustion efficiency of the coal oxygen is high, and the dust content of the furnace gas is low. The combustion state of flame can be adjusted by controlling the oxygen/coal injection ratio, and the components of furnace gas are controlled.
(5) The technology of continuously discharging the iron slag by a siphon method can stabilize the height of a material layer in the furnace, ensure a certain slag-coke ratio and further control the reaction speed and the reducing atmosphere in the furnace.
(6) The bottom blowing inert gas weak stirring process is adopted, so that the slag iron is more fully reduced, the high yield of iron is ensured, and the deep S removal is facilitated.
(7) The small slag and iron wells are arranged in the furnace, so that iron slag is separated in the furnace, the iron slag is prevented from being mixed out, and the recovery of furnace slag is facilitated.
(8) The process can control the oxidability of the slag by adjusting the height and the proportion of the slag-coke layer. The temperature of the escaped furnace gas is controlled by adjusting the height of the solid filling layer in the furnace. Therefore, the production process of the process is relatively stable and easy to control.
(9) The process is suitable for producing high-quality steel-making molten iron with low Si and low P.
Examples
By adopting the final reduction device and the method thereof, the effective volume is 0.03m34 times of final reduction of smelting reduction ironmaking are carried out on the small-sized thermal simulation furnace. The pre-reduced ore used was pre-reduced sponge iron, the chemical composition of which is shown in table 1. Metallization of prereduced sponge iron and addition to final reduction furnaceThe temperatures are shown in Table 2. While the pre-reduced sponge iron was added, pulverized coal and oxygen were continuously injected into the furnace by a coal-oxygen lance, and the injection amounts of pulverized coal and oxygen and the final reduction temperature ranges are shown in table 3. The composition of the coal dust injected is shown in table 4. While injecting coal oxygen, nitrogen gas was injected from the bottom of the furnace, and the injection amount is shown in Table 3. The energy consumption required for the test and its index are shown in table 5. The composition of the obtained molten iron was measured after the test, and the results are shown in table 6.
TABLE 1 examples chemical composition (wt%) of pre-reduced sponge iron
TABLE 2 examples metallization rate of pre-reduced sponge iron and temperature at the time of charging into the final reduction furnace
TABLE 3 pulverized coal, oxygen and nitrogen injection amounts and final reduction temperature ranges
TABLE 4 composition (wt%) of pulverized coal injected in examples
TABLE 5 comprehensive energy consumption and technical index
Injecting: the integrated coal consumption includes the coal content in the pellets and all the coal added and injected.
| Batch number | Integrated coal consumption kg/T | Consumption of oxygen Nm3/T | FeO in slag ％ | Coefficient of utilization T/m3.d |
| 1 | 870 | 540 | 2.6 | 21.6 |
| 2 | 820 | 490 | 5.5 | 23.0 |
| 3 | 904 | 550 | 2.1 | 23.2 |
TABLE 6 example molten iron composition (wt%) obtained in final reduction
| Element(s) Heat of furnace | S | Si | Mn |
| P | Fe | ||
| 1 | 4.3 | 0.20 | 0.40 | 0.05 | 0.021 | Surplus | ||
| 2 | 4.0 | 0.21 | 0.38 | 0.06 | 0.030 | Surplus | ||
| 3 | 4.1 | 0.22 | 0.35 | 0.51 | 0.027 | Surplus |
Claims (6)
1. A final reduction device for smelting reduction ironmaking comprises an iron bath furnace, and is characterized in that:
the final reduction device is a fixed vertical final reduction furnace with the inner diameter of a hearth consistent up and down, and the furnace comprises a furnace body (1), a small iron tapping well (14), a small slag tapping well (15), an iron tapping hole (8), a slag tapping hole (7), an emergency treatment hole (9), a furnace cover (16), an ore and solvent inlet (5), a pre-reduction ore inlet (3), a coal gas outlet (4), a pressure balance pipe (6), a coal-oxygen spray gun (2) and a bottom blowing nozzle (10). The small tapping well (14) and the small slag discharging well (15) are communicated and connected with the bottom of a hearth of the furnace body (1), the tapping hole (8) and the slag discharging hole (7) are respectively communicated with the small tapping well (14) and the small slag discharging well (15), the coal-oxygen spray gun (2) is arranged on the lower furnace wall of the furnace body (1), the bottom blowing nozzle (10) is arranged at the bottom of the hearth of the furnace body (1), the small slag discharging well (15) is communicated with the upper part of the hearth of the furnace body (1) through the pressure balance pipe (6), and the pre-reduction ore inlet (3), the coal gas outlet (4) and the ore and solvent inlet (5) are respectively arranged on a furnace cover (16); the pre-reduction ore inlet (3) is connected with the pre-reduction furnace through a discharging pipe, the gas outlet (4) is connected with the gasinlet of the pre-reduction furnace through a gas conveying pipeline and a dust remover, the ore and solvent inlet (5) is connected with the raw material bin through a conveying pipeline, and the emergency treatment port (9) is arranged at the bottom of the hearth.
2. The apparatus as claimed in claim 1, characterized in that the tap hole (8) and the tap hole (7) are vertically adjustable in height.
3. A final reduction method for smelting reduction ironmaking is carried out in a fixed vertical final reduction furnace, pre-reduced ores pre-reduced by a pre-reduction furnace are taken as raw materials, coal oxygen is taken as an energy source and a reducing agent, the pre-reduced ores and lump coal or crushed coke and slagging auxiliary materials which are added in proportion are respectively added into the fixed vertical final reduction furnace from a pre-raw ore inlet (3), an ore and a solvent inlet (5) to carry out final reduction, and the method is characterized in that:
(1) the discharge temperature of the pre-reduced ore is 800-850 ℃, the pre-reduction degree of the pre-reduced ore is 50-80 percent,
(2) the materials in the fixed vertical final reduction furnace are divided into three layers: the upper layer is a solid filling bed (13) consisting of pre-reduced ores, slagging accessories and coal briquettes, the middle layer is a liquid slag-coking fluidized bed layer (12) for supporting the solid filling bed, and the lower layer is a static slag and molten iron layer (11); the reduction reaction temperature of the upper part is 1100-1300 ℃, the reduction reaction temperature of the middle part is 1300-1400 ℃, and the temperature of the lower slag and the iron water layer is 1450-1500;
(3) by arrangingAn oxygen injection lance (2) arranged at thelower part of the furnace body (1) of the fixed vertical reduction furnace injects coal powder and oxygen into the liquid slag-coke fluidized bed (12) in the furnace, the injection amount of the coal powder is 600-550 Nm and 650kg/T, and the injection amount of the oxygen is 500-550Nm3/T；
(4) Inert gas is blown into the furnace through a nozzle (10) arranged at the bottom of the furnace, and the blowing strength is 0. 0.08-0.2Nm3/T.min；
(5) In the liquid slag-coke fluidized bed (12), the weight ratio of the solid coke to the liquid slag is 0.5-1.0.
4. A method according to claim 3, characterized in that the tap hole and tap hole heights are adjusted by means of a pressure equalizing tube (6) in dependence of the furnace pressure.
5. A method according to claim 3, characterized in that the tapping is done with siphon tapping through the tapping shaft (14) and tapping shaft (15).
6. A method according to claim 3, characterized in that the height of the tap hole (8) and the tap hole (7) is adjustable up and down.
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| CN99122121A CN1073628C (en) | 1999-10-27 | 1999-10-27 | Final reduction apparatus and method for fused reduction iron-smelting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN99122121A CN1073628C (en) | 1999-10-27 | 1999-10-27 | Final reduction apparatus and method for fused reduction iron-smelting |
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| CN1073628C CN1073628C (en) | 2001-10-24 |
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| CN103397129A (en) * | 2013-07-23 | 2013-11-20 | 首钢总公司 | Smelting reduction ironmaking furnace and ironmaking technology thereof |
| CN109371256A (en) * | 2018-11-29 | 2019-02-22 | 大余明发矿业有限公司 | A kind of lead reclaimer and its lead recovery process |
| CN114480771A (en) * | 2022-02-11 | 2022-05-13 | 中钢设备有限公司 | Integrated iron making device |
| CN115449581A (en) * | 2022-10-01 | 2022-12-09 | 北京首钢国际工程技术有限公司 | Tapping device and method for treating metallurgical solid waste in oxygen-enriched shaft furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1087124A (en) * | 1993-11-16 | 1994-05-25 | 冶金工业部钢铁研究总院 | Reduction iron-smelting process with carbon containing pellets-iron bath fusion |
| CN1036075C (en) * | 1994-08-27 | 1997-10-08 | 冶金工业部钢铁研究总院 | Fusion reducing iron smelting method and its equipment |
| NL9500600A (en) * | 1995-03-29 | 1996-11-01 | Hoogovens Staal Bv | Device for producing liquid pig iron by direct reduction. |
| AT403696B (en) * | 1996-06-20 | 1998-04-27 | Voest Alpine Ind Anlagen | MELTING CARBURETTOR AND SYSTEM FOR THE PRODUCTION OF A METAL MELT |
| EP0933436A1 (en) * | 1998-02-02 | 1999-08-04 | Sidmar N.V. | Installation and process for melting of direct-reduced iron |
-
1999
- 1999-10-27 CN CN99122121A patent/CN1073628C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102337393A (en) * | 2011-09-19 | 2012-02-01 | 李成武 | Vertical reducing kiln for sintering laterite-nickel ores |
| CN103397129A (en) * | 2013-07-23 | 2013-11-20 | 首钢总公司 | Smelting reduction ironmaking furnace and ironmaking technology thereof |
| CN103397129B (en) * | 2013-07-23 | 2016-03-02 | 首钢总公司 | A kind of melting reduction iron-making furnace and iron-smelting process thereof |
| CN109371256A (en) * | 2018-11-29 | 2019-02-22 | 大余明发矿业有限公司 | A kind of lead reclaimer and its lead recovery process |
| CN109371256B (en) * | 2018-11-29 | 2023-09-22 | 大余明发矿业有限公司 | Lead recovery equipment and lead recovery process thereof |
| CN114480771A (en) * | 2022-02-11 | 2022-05-13 | 中钢设备有限公司 | Integrated iron making device |
| CN115449581A (en) * | 2022-10-01 | 2022-12-09 | 北京首钢国际工程技术有限公司 | Tapping device and method for treating metallurgical solid waste in oxygen-enriched shaft furnace |
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| CN1073628C (en) | 2001-10-24 |
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