CN103757168B - A kind of ironmaking rotary kiln and iron-smelting process thereof - Google Patents
A kind of ironmaking rotary kiln and iron-smelting process thereof Download PDFInfo
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- CN103757168B CN103757168B CN201310747865.XA CN201310747865A CN103757168B CN 103757168 B CN103757168 B CN 103757168B CN 201310747865 A CN201310747865 A CN 201310747865A CN 103757168 B CN103757168 B CN 103757168B
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Abstract
The present invention relates to a kind of ironmaking rotary kiln and iron-smelting process thereof, iron-smelting process carries out in the steps below: (1) burning gas preheating; (2) rotary kiln heating; (3) smelt iron; Ironmaking rotary kiln, comprises regenerator, rotary kiln, device for recovering tail gas; Described regenerator comprises gas regenerator and air regenerator; Like this by the temperature increase in kiln to 1700 DEG C, can realize smelting iron object with rotary kiln, change the technique of traditional blast furnace ironmaking like this, reduce group's ball, sintering process saving coal consumption, reduce the process procedure of ironmaking, reduce the production link of ironmaking, thus reduce costs and pollution to environment.
Description
Technical field
The present invention relates to a kind of ironmaking rotary kiln and iron-smelting process thereof.
Background technology
Existing rotary kiln uses coal dust and warm air burning, in kiln, top temperature is 1100 DEG C, temperature does not reach ironmaking temperature, existing iron smelting method uses blast furnace ironmaking, but blast furnace ironmaking cost is high, power consumption is large, does not depart from group's ball, sintering process, and blast furnace ironmaking equipment is huge covers an area of, operation is various, and the environmental pressure caused is serious.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of rotary kiln that can smelt iron and iron-smelting process thereof.
The present invention adopts following technical scheme:
A kind of ironmaking rotary kiln comprises regenerator, rotary kiln, device for recovering tail gas;
Described regenerator comprises gas regenerator and air regenerator;
Described gas regenerator is provided with gas entry, gas exit, gas chamber gas inlet and gas chamber offgas outlet, described gas entry is connected with cooled coal gas pipe by cooled coal gas arm, described cooled coal gas pipe is connected with coal-gas producer, described gas exit is connected with bocca by hot gas pipe, described gas chamber gas inlet is connected with offgas duct by tail gas arm, described offgas duct is connected with device for recovering tail gas, and described gas chamber offgas outlet is connected with tail gas recycle pipe by tail gas recycle arm;
Described air regenerator is provided with gas inlet, air vout, wind box gas inlet and wind box offgas outlet, described gas inlet is connected with cold air pipe by freezing air arm, described cold air pipe is connected with gas blower, described air vout is connected with bocca by warm-air pipe, described wind box gas inlet is connected with offgas duct by tail gas arm, and described wind box offgas outlet is connected with tail gas recycle pipe by tail gas recycle arm;
Described rotary kiln is tilting on pedestal, and the kiln hood of described rotary kiln is lower than kiln tail, and described kiln tail is provided with raw material powder entrance, and described kiln hood is provided with molten iron outlet;
The tail gas gas blower that described device for recovering tail gas comprises offgas duct, tail gas recycle pipe and is arranged in offgas duct, described offgas duct one end is fixedly installed on kiln tail, the other end is connected with gas chamber gas inlet with wind box gas inlet by tail gas arm, and described tail gas recycle pipe is connected with gas chamber offgas outlet with wind box offgas outlet by offgas duct;
Described hot gas pipe and warm-air pipe converge to bocca, and described bocca is corresponding with rotary kiln end;
Described gas entry, gas exit, gas chamber gas inlet, gas chamber offgas outlet, gas inlet, air vout, wind box gas inlet and wind box offgas outlet are respectively arranged with air door.
Described gas regenerator and air regenerator arrange more than two with the use of.
Described rotary kiln end inwall builds zircon corundum brick, and described rotary kiln inwall builds magnesite chrome brick, and described bocca inwall builds zircon corundum brick.
Described offgas duct and tail gas recycle inside pipe wall build insulating brick.
Described rotary kiln and horizontal plane angle are 3-5 °.
the present invention provides above-mentioned on the other handthe iron-smelting process of ironmaking rotary kiln, carries out in the steps below when smelting iron:
(1) burning gas preheating
(1.1) high-temperature tail gas of rotary kiln imports gas regenerator and air regenerator;
(1.2) coal gas of being derived by coal-gas producer, import the gas regenerator that accumulation of heat completes, gas temperature behind gas regenerator gets a promotion, and air is sent to the air regenerator of accumulation of heat by gas blower, and the air themperature after air regenerator gets a promotion;
(2) rotary kiln heating
The spontaneous combustion after bocca converges through the coal gas of the high temperature of regenerator and the air of high temperature, heats kiln hood;
(3) smelt iron
Raw material powder enters rotary kiln from kiln tail, and under the continuous rotation of tilting rotary kiln, raw material powder moves to the high-temperature zone of rotary kiln, forms molten iron, flows out obtain molten iron through stream material mouth.
In above-mentioned steps (1.1), described rotary kiln exhaust gas temperature is 1100-1200 DEG C,
In above-mentioned steps (1.1), the temperature after described regenerator heating is 950-1000 DEG C,
In above-mentioned steps (2), the temperature of the coal gas of described high temperature and the air of high temperature is 800-900 DEG C,
In above-mentioned steps (2), described kiln hood flame temperature is 1500-1700 DEG C;
The composition of the mass percent of above-mentioned raw materials powder:
Powdered iron ore 68-75%,
Coal dust 15-17%,
Wingdale 10-17%;
Furtherly, tail gas, again through tail gas recycle pipe, is delivered to raw material powder heating unit, preheats raw material powder by the high-temperature tail gas flowing out regenerator.
Furtherly, raw material powder is preheated to 200-300 DEG C.
Positively effect of the present invention is as follows:
The present invention can by the temperature increase in kiln to 1700 DEG C, can realize smelting iron object with rotary kiln, the technique of the traditional blast furnace ironmaking of such change, reduce group's ball, sintering process saving coal consumption, reduce the process procedure of ironmaking, reduce the production link of ironmaking, thus reduce costs and pollution to environment.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present invention;
Accompanying drawing 2 is regenerator internal structure schematic diagram of the present invention;
Accompanying drawing 3 is bocca structural representation of the present invention;
Accompanying drawing 4 is the present invention's two groups of regenerator material flow schematic diagram;
Accompanying drawing 5 is the present invention's two groups of regenerator Two-ports structure schematic diagram;
In the accompanying drawings: 1 gas regenerator, 11 gas entries, 12 gas exits, 13 gas chamber gas inlets, 14 gas chamber offgas outlet, 2 air regenerators, 21 gas inlets, 22 air vouts, 23 wind box gas inlets, 24 wind box offgas outlet, 3 cooled coal gas pipes, 31 cooled coal gas arms, 32 hot gas pipes, 4 rotary kilns, 41 kiln hoods, 42 kiln tails, 5 boccas, 6 offgas duct, 61 tail gas arms, 62 tail gas recycle arms, 63 tail gas recycle pipes, 7 cold air pipes, 71 freezing air arms, 72 warm-air pipes, 8 tail gas gas blowers, 9 air doors, 10 regenerator.
Embodiment
Embodiment 1: as described in accompanying drawing 2, a kind of ironmaking rotary kiln, comprises regenerator 10, rotary kiln 4, device for recovering tail gas;
Described regenerator comprises gas regenerator 1 and air regenerator 2:
Described gas regenerator 1 is provided with gas entry 11, gas exit 12, gas chamber gas inlet 13 and gas chamber offgas outlet 14, described gas entry 11 is connected with cooled coal gas pipe 3 by cooled coal gas arm 31, described cooled coal gas pipe 3 is connected with coal-gas producer, described gas exit 12 is connected with bocca 5 by hot gas pipe 32, described gas chamber gas inlet 13 is connected with offgas duct 6 by tail gas arm 61, described offgas duct 6 is connected with device for recovering tail gas, described gas chamber offgas outlet 14 is connected with tail gas recycle pipe 63 by tail gas recycle arm 62,
Described air regenerator is provided with gas inlet 21, air vout 22, wind box gas inlet 23 and wind box offgas outlet 24, described gas inlet 21 is connected with cold air pipe 7 by freezing air arm 71, described cold air pipe 7 is connected with gas blower, described air vout 22 is connected with bocca 5 by warm-air pipe 72, described wind box gas inlet 23 is connected with offgas duct 6 by tail gas arm 61, and described wind box offgas outlet 24 is connected with tail gas recycle pipe 63 by tail gas recycle arm 62.
Described rotary kiln 4 is tilting on pedestal, the inclination angle of rotary kiln 4 be the kiln hood 41 of 4 ° of described rotary kilns 4 lower than kiln tail 42, described kiln tail 42 is provided with raw material powder entrance, and described kiln hood 41 is provided with molten iron outlet;
The tail gas gas blower 8 that described device for recovering tail gas comprises offgas duct 6, tail gas recycle pipe 63 and is arranged in offgas duct 6, described offgas duct 6 one end is fixedly installed on kiln tail 42, the other end is connected with gas chamber gas inlet 13 with wind box gas inlet 23 by tail gas arm 61, and described tail gas recycle pipe 63 is connected with gas chamber offgas outlet 14 with wind box offgas outlet 24 by offgas duct 62;
Described hot gas pipe 32 and warm-air pipe 72 converge to bocca 5, and described bocca 5 is corresponding with rotary kiln end 41;
Described gas entry 11, gas exit 12, gas chamber gas inlet 13, gas chamber offgas outlet 14, gas inlet 21, air vout 22, wind box gas inlet 23 and wind box offgas outlet 24 are respectively arranged with air door 9.
As as described in accompanying drawing 1,4, the heat storage in regenerator is built into stereo grid shaped, and heat storage can be refractory brick, the form of piling up of three-dimensional hollow mesh structure is conducive to heat storage accumulation of heat and heat release, be two groups for regenerator, two groups of regenerator hocket accumulation of heat and allow heat, cycle be 30min, wherein during one group of accumulation of heat, gas entry 11, gas inlet 21, the air door 9 of gas exit 12 and air vout 22 is closed, gas chamber gas inlet 13, gas chamber offgas outlet 14, the air door 9 of wind box gas inlet 23 and wind box offgas outlet 24 is opened, now the high-temperature tail gas dredged by kiln tail 42 of offgas duct 6 is sent into gas regenerator 1 and air regenerator 2 by tail gas gas blower 8 and is made the heat storage in regenerator absorb heat in tail gas, the tail gas flowing out gas chamber offgas outlet 14 and wind box offgas outlet 24 converges to tail gas recycle pipe 63 by tail gas recycle arm 62, tail gas is sent to raw material powder primary heater unit by tail gas recycle pipe 63 again, improve the temperature that raw material powder enters rotary kiln, meanwhile, another group is carrying out heat release, when the regenerator that accumulation of heat completes carries out heat release, gas chamber gas inlet 13, gas chamber offgas outlet 14, the air door 9 of wind box gas inlet 23 and wind box offgas outlet 24 is closed, gas entry 11, gas inlet 21, the air door 9 of gas exit 12 and air vout 22 is opened, the coal gas of 300-500 DEG C that is now transported by coal-gas producer can enter gas regenerator 1 by gas entry 11, carry out the coal gas after heat exchange and enter hot gas pipe 32 via gas exit 12, then bocca 5 is transported to, being transported by gas blower is, after air enters air regenerator heat exchange via gas inlet 21, enter warm-air pipe 72, be then transported to bocca 5 through air vout 22, the coal gas of high temperature and air are in bocca 5 spontaneous combustion, and the flame temperature of kiln hood 41 can reach 1650 DEG C, and such kiln hood just can keep optimum ironmaking temperature (1480-1520 DEG C).
Rotary kiln end 41 inwall builds zircon corundum brick, and described rotary kiln 42 inwall builds magnesite chrome brick, can use different fire-proof and thermal-insulation insulating bricks, reduce costs, also can better adapt to need of production because kiln hood 41 is different with the temperature that kiln tail 42 bears.
Bocca 5 inwall build zircon corundum brick, due to bocca 5 to bear very high-temperature so heat insulating refractory material is reliability and durability.
Offgas duct 6 and tail gas recycle pipe 63 inwall build insulating brick, need insulation when tail gas carry, and one is reduce thermosteresis, two infringements that are minimizing high temperature to surrounding devices and personnel.
Hot gas pipe 32 diameter is 1200mm, and after finishing building insulating brick, effective diameter is 750mm, and warm-air pipe 72 diameter is 1600mm, and after finishing building insulating brick, effective diameter is 1150mm; Bocca 5 is built into by the refractory brick of zircon corundum material, and as described in accompanying drawing 3, on bocca 5, top is arc, and arc top maximum height is 1000mm, and width is 700mm; Rotary kiln length 64000mm, external diameter is 3200mm, and kiln hood place 12000mm builds zircon corundum brick, and rest part builds chromium magnesium zirconia block, and after block fire proofing tile, the effectively interior warp of rotary kiln is 2700mm; Offgas duct 6 diameter that kiln tail 42 is arranged is the spiral tube of 1500mm, and inside and outside block of spiral tube has light-weight insulating brick.
Powdered iron ore and coal dust, raw material powder after the raw materials such as Wingdale mix enters in kiln body by kiln tail 42, because tilting kiln body constantly rotates, along with the rotation of rotary kiln, material slowly and is uniformly pushed to kiln hood 41, raw material powder is advanced to kiln hood 41 gradually, due to high temperature in kiln body, the carbon monoxide that carbon in coal dust is formed in the hot environment of anoxic, by the 2+ in iron ore, 3+, the Fe3+ reduction of 4+ becomes iron simple substance, when arriving kiln hood 41 high-temperature area, the fe be reduced at high temperature is fused into liquid state, Wingdale in raw material powder plays desulfurization and catalysis, the effect of slag making, the molten iron of high temperature flows out by flowing material mouth, because residue light specific gravity can float on above molten iron, finally discharged by slag-drip opening, molten iron is obtained through separator.
Gas regenerator 1 and air regenerator 2 arrange more than two with the use of, such production just can be carried out continuously, the coal gas of preheating and air can continually be carried in kiln, produce continual carrying out, optimum settings with two groups of regenerator, when the regenerator of more than three groups coordinates, be applicable to large-scale ironmaking rotary kiln.
As described in accompanying drawing 1,2,4, above-mentioned a kind of iron-smelting process of smelting iron rotary kiln, carries out in the steps below:
(1) burning gas preheating
(1.1) high-temperature tail gas of rotary kiln imports gas regenerator and air regenerator and will be stored in regenerator;
(1.2) coal gas of being derived by coal-gas producer, import the gas regenerator that accumulation of heat completes, gas temperature behind gas regenerator gets a promotion, and by gas blower, air is sent to the air regenerator of accumulation of heat, and the air themperature after air regenerator gets a promotion;
(2) rotary kiln heating
The spontaneous combustion after bocca converges through the coal gas of the high temperature of regenerator and the air of high temperature, heats kiln hood;
(3) smelt iron
Raw material powder enters rotary kiln from kiln tail, and under the continuous rotation of tilting rotary kiln, raw material powder moves to the high-temperature zone of rotary kiln, forms molten iron, flows out obtain molten iron through stream material mouth.
In described step (1.1), described rotary kiln exhaust gas temperature is 1150 DEG C,
In described step (1.1), the temperature after described regenerator heating is 980 DEG C,
In described step (2), the temperature of the coal gas of described high temperature and the air of high temperature is 850 DEG C,
In described step (2), described kiln hood is heated by the flame 1650 DEG C.
The composition of the mass percent of described raw material powder:
Powdered iron ore 72%,
Coal dust 16%,
Wingdale 12%.
Tail gas, again through tail gas recycle pipe, is delivered to raw material powder heating unit, preheats raw material powder by the high-temperature tail gas flowing out regenerator.
Raw material powder is preheated to 200-300 DEG C by tail gas.
The present invention relates to the relevant device of ironmaking, the associated production line equipment such as coal-gas producer, ore powder processing units, temperature controlling system are identical with existing installation.
Embodiment 2: on the basis of embodiment 1 in the process of ironmaking, the temperature in step 1 and step 2 can also be:
In described step (1.1), described rotary kiln exhaust gas temperature is 1200 DEG C,
In described step (1.1), the temperature after described regenerator heating is 1000 DEG C,
In described step (2), the temperature of the coal gas of described high temperature and the air of high temperature is 900 DEG C,
In described step (2), described kiln hood flame temperature is 1700 DEG C.
The composition of the mass percent of described raw material powder furtherly:
Powdered iron ore 68%,
Coal dust 17%,
Wingdale 15%.
The inclination angle of rotary kiln 4 is 3 °.
Embodiment 3: on the basis of embodiment 1 in the process of ironmaking, the temperature in step 1 and step 2 can also be:
In described step (1.1), described rotary kiln exhaust gas temperature is 1100 DEG C,
In described step (1.1), the temperature after described regenerator heating is 950 DEG C,
In described step (2), the temperature of the coal gas of described high temperature and the air of high temperature is 800 DEG C,
In described step (2), described kiln hood is heated by the flame 1500 DEG C.
The composition of the mass percent of described raw material powder:
Powdered iron ore 75%,
Coal dust 15%,
Wingdale 10%.
The inclination angle of rotary kiln 4 is 5 °.
Embodiment 4: as shown in Figure 2, each regenerator has 4 import and export in embodiment 1, and corresponding outlet connecting pipe road, pipeline arranges air door respectively, and regenerator opening is too much.On the basis of said structure, as shown in Figure 5, play the exhaust pipe opening of pre-heat effect, directly can be opened in that corresponding (heating air flow is usually contrary with coal gas, air draught, many employings adverse current heat) coal gas or air turnover regenerator duct wall on, the position offering mouth is in by the air door middle part offering pipeline regenerator opening and this pipeline, the air-flow of each pipeline can control separately to be independent of each other like this, control identical with primary structure, such improvement can reduce the opening of regenerator half.
Claims (9)
1. an ironmaking rotary kiln, is characterized in that: it comprises regenerator (10), rotary kiln (4), device for recovering tail gas; Described regenerator (10) comprises gas regenerator (1) and air regenerator (2);
Described gas regenerator (1) is provided with gas entry (11), gas exit (12), gas chamber gas inlet (13) and gas chamber offgas outlet (14), described gas entry (11) is connected with cooled coal gas pipe (3) by cooled coal gas arm (31), described cooled coal gas pipe (3) is connected with coal-gas producer, described gas exit (12) is connected with bocca (5) by hot gas pipe (32), described gas chamber gas inlet (13) is connected with offgas duct (6) by tail gas arm (61), described offgas duct (6) is connected with device for recovering tail gas, described gas chamber offgas outlet (14) is connected with tail gas recycle pipe (63) by tail gas recycle arm (62),
Described air regenerator is provided with gas inlet (21), air vout (22), wind box gas inlet (23) and wind box offgas outlet (24), described gas inlet (21) is connected with cold air pipe (7) by freezing air arm (71), described cold air pipe (7) is connected with gas blower, described air vout (22) is connected with bocca (5) by warm-air pipe (72), described wind box gas inlet (23) is connected with offgas duct (6) by tail gas arm (61), described wind box offgas outlet (24) is connected with tail gas recycle pipe (63) by tail gas recycle arm (62),
Described rotary kiln (4) is tilting on pedestal, and the kiln hood (41) of described rotary kiln (4) is lower than kiln tail (42), and described kiln tail (42) is provided with raw material powder entrance, and described kiln hood (41) is provided with molten iron outlet;
The tail gas gas blower (8) that described device for recovering tail gas comprises offgas duct (6), tail gas recycle pipe (63) and is arranged in offgas duct (6), described offgas duct (6) one end is fixedly installed on kiln tail (42), the other end is connected with gas chamber gas inlet (13) with wind box gas inlet (23) by tail gas arm (61), and described tail gas recycle pipe (63) is passed through
tail gas recycle arm (62)be connected with gas chamber offgas outlet (14) with wind box offgas outlet (24);
Described hot gas pipe (32) and warm-air pipe (72) converge to bocca (5), and described bocca (5) is corresponding with rotary kiln end (41);
Described gas entry (11), gas exit (12), gas chamber gas inlet (13), gas chamber offgas outlet (14), gas inlet (21), air vout (22), wind box gas inlet (23) and wind box offgas outlet (24) are respectively arranged with air door (9)
described rotary kiln end (41) inwall builds zircon corundum brick, and described rotary kiln (42) inwall builds magnesite chrome brick, and described bocca (5) inwall builds zircon corundum brick.
2. according to described in claim 1 one ironmaking rotary kiln, it is characterized in that described gas regenerator (1) and air regenerator (2) arrange more than two with the use of.
3. the one ironmaking rotary kiln according to claim 1 or 2, is characterized in that: described offgas duct (6) and tail gas recycle pipe (63) inwall build insulating brick.
4. one ironmaking rotary kiln according to claim 1 and 2, is characterized in that: described rotary kiln (4) and horizontal plane angle are 3-5 °.
5. an iron-smelting process for the ironmaking rotary kiln as described in claim 1, is characterized in that: carry out in the steps below when smelting iron:
(1) burning gas preheating
(1.1) high-temperature tail gas of rotary kiln imports gas regenerator and air regenerator;
(1.2) coal gas of being derived by coal-gas producer, import the gas regenerator that accumulation of heat completes, gas temperature behind gas regenerator gets a promotion, and air is sent to the air regenerator of accumulation of heat by gas blower, and the air themperature after air regenerator gets a promotion;
(2) rotary kiln heating
The spontaneous combustion after bocca converges through the coal gas of the high temperature of regenerator and the air of high temperature, heats kiln hood;
(3) smelt iron
Raw material powder enters rotary kiln from kiln tail, and under the continuous rotation of tilting rotary kiln, raw material powder moves to the high-temperature zone of rotary kiln, forms molten iron, flows out obtain molten iron through stream material mouth.
6. smelt iron the iron-smelting process of rotary kiln according to a kind of described in claim 5, it is characterized in that:
In described step (1.1), described rotary kiln exhaust gas temperature is 1100-1200 DEG C,
In described step (1.1), the temperature after described regenerator heating is 950-1000 DEG C,
In described step (2), the temperature of the coal gas of described high temperature and the air of high temperature is 800-900 DEG C,
In described step (2), described kiln hood flame temperature is 1500-1700 DEG C.
7., according to the iron-smelting process of a kind of rotary kiln described in claim 5, it is characterized in that:
The composition of the mass percent of described raw material powder:
Powdered iron ore 68-75%,
Coal dust 15-17%,
Wingdale 10-17%.
8. according to the iron-smelting process of a kind of rotary kiln described in claim 5, it is characterized in that: tail gas, again through tail gas recycle pipe, is delivered to raw material powder heating unit, preheats raw material powder by the high-temperature tail gas flowing out regenerator.
9. the iron-smelting process of a kind of rotary kiln described according to Claim 8, is characterized in that: raw material powder is preheated to 200-300 DEG C.
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| CN201310747865.XA CN103757168B (en) | 2013-12-31 | 2013-12-31 | A kind of ironmaking rotary kiln and iron-smelting process thereof |
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| CN201310747865.XA CN103757168B (en) | 2013-12-31 | 2013-12-31 | A kind of ironmaking rotary kiln and iron-smelting process thereof |
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| CN103757168B true CN103757168B (en) | 2015-10-07 |
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| CN106636519B (en) * | 2016-10-12 | 2018-05-08 | 唐竹胜 | The two-sided flame-insulating type heating rotary kiln of entire body and the carbon-based fertile method of production direct reduced iron coproduction |
| CN107843110A (en) * | 2017-11-29 | 2018-03-27 | 浙江大东吴集团建设新材料有限公司 | A kind of heated air circulation type Expanded Clay Rotary Kilns |
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| DE2251707A1 (en) * | 1972-10-21 | 1974-04-25 | Guenter Dipl Ing Heitmann | Direct redn of low-grade iron ore - contg sulphur, phosphorus, arsenic, utilizes reducing stage gases for prior oxidn stage for thermal efficiency |
| US4032121A (en) * | 1974-02-22 | 1977-06-28 | Vereinigte Osterreichische Eisen- Und Stahlwerek-Alpine Montan Aktiengesellschaft | Process for the production of iron from iron ores and apparatus for carrying out said process |
| US4179280A (en) * | 1977-04-30 | 1979-12-18 | Metallgesellschaft Aktiengesellschaft | Direct-reduction process carried out in a rotary kiln |
| CN87104326A (en) * | 1986-06-21 | 1988-01-20 | 金属股份有限公司 | The technology of direct reduction of iron oxide-containing material in rotary kiln |
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2013
- 2013-12-31 CN CN201310747865.XA patent/CN103757168B/en not_active Expired - Fee Related
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| US4032121A (en) * | 1974-02-22 | 1977-06-28 | Vereinigte Osterreichische Eisen- Und Stahlwerek-Alpine Montan Aktiengesellschaft | Process for the production of iron from iron ores and apparatus for carrying out said process |
| US4179280A (en) * | 1977-04-30 | 1979-12-18 | Metallgesellschaft Aktiengesellschaft | Direct-reduction process carried out in a rotary kiln |
| CN87104326A (en) * | 1986-06-21 | 1988-01-20 | 金属股份有限公司 | The technology of direct reduction of iron oxide-containing material in rotary kiln |
| CN103058536A (en) * | 2012-11-26 | 2013-04-24 | 石家庄新华能源环保科技股份有限公司 | Heat-accumulation dividing-wall heating rotary kiln device |
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| Title |
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