CN210916204U - Iron ore rotary kiln coal-based hydrogen metallurgy device - Google Patents

Abstract

The utility model discloses an iron ore rotary kiln coal-based hydrogen metallurgy device, which comprises a rotary kiln, and a chain grate, an oxygen-free cooling device and a slag iron melting device which are respectively connected with the rotary kiln, wherein a gas discharge port of the rotary kiln is communicated with a gas inlet of the chain grate; the outlet end of the anaerobic cooling device is provided with a dry magnetic separator, the pellet discharge port of the dry magnetic separator is communicated with a dry grinding and dry separation device, the discharge port of the dry grinding and dry separation device is also provided with a cold pressing device, and the carbon discharge port and the particle size classification of the dry magnetic separatorThe machine is communicated. The utility model discloses an iron ore reduction with H₂Mainly and easily obtained, and realizes the thermal intersection of the coal full pyrolysis and the iron oxide reduction process; the reaction temperature point of hydrogen metallurgy is low, more heat is transferred into the material layer under the same combustion space temperature, so that the reduction speed of the pellets is accelerated, the process energy consumption is low, the productivity is greatly improved on the premise of the same heat transfer quantity, the reduction speed is high, the productivity is high, and the essential energy conservation, the essential emission reduction and the essential safety are effectively realized.

Description

Iron ore rotary kiln coal-based hydrogen metallurgy device

Technical Field

The utility model belongs to the technical field of metallurgical heat energy, concretely relates to iron ore rotary kiln coal-based hydrogen metallurgy device.

Background

The traditional blast furnace iron making is a smelting technology which relies on metallurgical coke as a reducing agent and fuel, and the process is a typical carbon metallurgy process. The annual capacity of blast furnace iron making all over the world is very large, and the trend of further development is also shown, a large amount of high-quality metallurgical coke needs to be provided, the high-quality metallurgical coke is refined by expensive caking coking coal, the coking coal all over the world only accounts for 8-10% of the total coal storage, and the gradual expansion of blast furnace iron making scale leads the coking coal to be more and more scarce.

In the carbon metallurgy process, the C element in metallurgical coke is CO at high temperature₂The gasification generates CO, and the CO is used as a reducing agent to remove the oxygen of the iron oxide in the iron ore. It is prepared from CO₂Carbon gasification (CO) as gasifying agent₂+ C → 2CO-165.8 kJ/mol) as core, gasifying C into CO and reducing iron oxide, which is a strong endothermic process, and 82.9kJ heat is consumed for generating 1mol CO in the carbon gasification reaction, and the heat accounts for about 60% of the total heat consumption of the blast furnace. Meanwhile, the molecular radius of CO is large, so that the permeation speed in the iron ore is low, and therefore, the iron oxide needs a high temperature condition in the reduction process, and the heat consumption is high.

In the hydrometallurgical process, with H₂As reducing agent, H₂The reducing agent has small molecular radius, is the most active reducing agent, has the reduction potential which is 11 times that of CO and the permeation speed which is about 5 times that of CO, and can easily permeate into the iron ore. Therefore, compared with carbon metallurgy, hydrogen metallurgy can reduce the reaction temperature, improve the reaction speed, greatly reduce the heat consumption, and has the advantages of great capacity advantage, energy conservation and emission reduction.

The key to realizing the hydrogen metallurgy process is how to obtain cheap H₂. Someone will contain a large amount of H₂The coke oven gas is recycled into the blast furnace, and H in the coke oven gas is also recycled₂And CH therein₄Reforming into H₂In combination with CO for gas-based reduction shaft furnaces, nuclear hydrogen production and hydrogen metallurgy have also been proposed, but these H' s₂The method for reducing iron ore requires the prior production of H₂Then adding H₂The method is used for reducing iron ores, has complex production process and higher energy consumption and cost, and is not industrially applied.

In fact, sufficient H can be obtained by the thermal intersection of the full pyrolysis process of coal with the iron oxide reduction process₂Thereby realizing the hydrogen metallurgy process.

In the traditional iron-burning iron-making process, coke produced by a coke oven is used as a reducing agent and fuel of a blast furnace. Due to the heat transfer characteristics of the coke oven, the coal pyrolysis occurring in the coking chamber of the coke oven is insufficient, and coal chemical products such as tar, benzene, naphthalene, alkane, alkene, hydrocarbon and the like are produced, H is contained in the coke oven gas₂The content is only about 60 percent, and the H is₂Has no intersection with the process of reducing the iron ore by the blast furnace.

Pyrolysis of coal refers to a complex process of heating coal in the absence of air or an inert atmosphere, with a series of physical changes and chemical reactions taking place. The main structure of coal is three-dimensional high molecular compound, which is composed of similar structural units linked together by covalent bridge bonds and non-chemical bonds, and the core of these structural units is condensed aromatic ring structure. A certain proportion of small molecular compounds are distributed in the macromolecular structure of the coal, and the characteristic is more obvious in low-rank coal. The pyrolysis of coal is due to the thermal breakdown of weak bond structures in coal, which generates small molecule free radical fragments. When the heating temperature of the coal is higher than the fracture temperature of the weak bond structure in the coal, the weak bond in the macromolecular structure of the coal can be fractured to form small molecular free radical fragments and volatile matters. After the volatile matter leaves the coal particles, the volatile matter is influenced by the surrounding high-temperature environment, and secondary and repeated reactions such as condensation polymerization, cracking and the like can further occur among all substances in the volatile matter. In the temperature range of 900-1000 ℃, the pyrolysis of coal is sufficient, and the final gas product is H₂Mainly comprises the following steps.

The prior traditional direct reduction process of the iron ore rotary kiln adopts anthracite or metallurgical coke with high thermal shock resistance as a reducing agent and fuel, and adopts a typical carbon metallurgy process. Although a direct reduced iron product with a metallization rate of about 90% can be obtained, the further development of the direct reduced iron product is limited by inherent defects of poor raw fuel applicability, low capacity, high energy consumption, high cost, poor production stability and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an iron ore rotary kiln coal-based hydrogen metallurgy device to solve above-mentioned problem.

In order to achieve the above object, the utility model discloses a technical scheme be:

a coal-based hydrogen metallurgy process device of an iron ore rotary kiln comprises the rotary kiln, and a chain grate, an oxygen-free cooling device and a slag iron melting device which are respectively connected with the rotary kiln, wherein a gas discharge port of the rotary kiln is communicated with a gas inlet of the chain grate; the outlet end of the anaerobic cooling device is provided with a dry magnetic separator, a pellet discharge port of the dry magnetic separator is communicated with a dry grinding and dry separation device, a cold pressing device is further arranged at a discharge port of the dry grinding and dry separation device, and a carbon discharge port of the dry magnetic separator is communicated with a particle size classifier.

And the exhaust ports of the hot blast stove are respectively communicated with the high-temperature gas inlets of the rotary kiln, the slag iron melting and separating device and the concentrate drying machine.

And a dust removal device and a temperature adjusting chamber are arranged between the chain grate machine and the rotary kiln.

The slag iron melting and separating device and the concentrate drying machine are respectively connected with the waste heat boiler, and a dust removal device is arranged between the slag iron melting and separating device and the waste heat boiler.

And a kiln back fan is arranged on the rotary kiln.

And a dust removal device is arranged at an exhaust port of the waste heat boiler.

And air inlets of the hot blast stove, the temperature regulating chamber and the waste heat boiler are respectively communicated with the air blower.

The design principle of the utility model is as follows:

the utility model discloses use iron ore to be 55-65% iron ore concentrate of iron grade, iron ore, binder and liquid phase modulating agent etc. make phi 10-20mm green pellet through batching, mix after, through the drying of grate, preheat and enter into the hydrogen metallurgy rotary kiln from the pan feeding end after 800 jia's of one's food 900 ℃, the granularity is spouted into from the rotary kiln discharge end at 10-30 mm's pellet coal, the pellet rolls in the kiln and goes on the in-process temperature and rise constantly, when it goes to the rotary kiln hydrogen metallurgy calcination region and be the back end in the kiln body, mix with the pellet coal of spouting, through mixing in the pellet coal of spouting, through the batching, mix in the back end in itH produced by coal pyrolysis₂And with H₂H generated by carbon gasification reaction by taking O as gasification agent₂The iron ore is reduced, and the high integration of the full pyrolysis process of the coal and the metallurgical reduction process of the iron ore in a thermal state is realized.

A rotary kiln hydrometallurgy roasting area: the mixed material composed of the pellets and the dead granular carbon is heated in the process of rolling in the kiln after entering the kiln, the temperature is continuously raised, and the temperature of the material reaches above 950 ℃ when the material moves to the middle section of the kiln body of the rotary kiln. The granulated coal sprayed from the discharge end of the rotary kiln is distributed to all places of the rear section of the kiln body along the length direction of the kiln body according to the process requirement, enters a material layer along with the material rolling and is uniformly mixed with other materials, a material layer distribution area formed by mixing pellets, stagnant carbon and granulated coal is formed in the rotary kiln, and a hydrogen metallurgy process which is dominated by the combination of oxygen element in pellet iron oxide, hydrogen element in the granulated coal and carbon element in the stagnant carbon and fully pyrolyzes the coal, gasifies the carbon process and highly integrates the iron oxide reduction process in a thermal state can be generated in a thermal state material layer in the area; the dead carbon existing in the area comprises dead granular carbon entering from a feeding end of the rotary kiln and dead carbon containing active granular carbon formed in the middle and rear sections after full pyrolysis of the granular coal entering a material layer at the front section of the area. The space in the rotary kiln where this hydrometallurgical process takes place is referred to as the rotary kiln hydrometallurgical firing zone.

Coal is fully pyrolyzed in the rotary kiln coal-based hydrogen metallurgy process: the coal-based hydrogen metallurgy adopts high volatile coal, and the coal is pyrolyzed into carbon-rich stagnant carbon and hydrogen-rich volatile at the temperature of 350-. Pyrolysis of coal at low temperatures is not sufficient and produces hydrogen-rich volatiles including large molecular weight gases such as tars, benzene, naphthalene, alkanes, alkenes, hydrocarbons, and H₂、H₂O、CO、CO₂、H₂S and other small molecular weight gases; in the material bed space of the rotary kiln hydro-metallurgical roasting area, when the temperature reaches more than 950 ℃, the tar, benzene, naphthalene, alkane, alkene, hydrocarbon and other high molecular weight gases can generate secondary and multiple pyrolysis, and finally the generated gas product can be H₂Mainly produces a large amount of solid active granular carbon at the same time, namelyThe coal is fully pyrolyzed. In fact, for all coal types, the complete pyrolysis of coal is completed before 1000 ℃.

Any granular coal is sprayed into the surface of the material layer in the hydro-metallurgical roasting area of the rotary kiln from the discharge end, and in the parabolic movement process of the combustion space, because the surface temperature of the granular coal is rapidly raised, a small amount of volatile matters are separated out on the surface of the granular coal, and the granular coal enters the combustion space of the rotary kiln and is used as fuel after being fully pyrolyzed. After any granular coal falls to the surface of the material layer, the granular coal can rapidly enter the material layer along with the rolling and advancing of the roasted material to contact with peripheral high-temperature materials, volatile matters released in the temperature rising process of the surface layer and the shallow layer of the granular coal can enter gaps of the high-temperature material layer, and H is generated through full pyrolysis₂And activated granular carbon, H₂Will be directly used as a reducing agent for reducing iron oxide in a hot state, and the active granular carbon will stay on the surface of the pellets or the granulated coal.

The surface and the shallow layer of any granular coal in the material layer of the rotary kiln hydrogen metallurgy roasting area are heated to form a high-temperature area, the temperature reaches about 950 ℃, any part of the core from shallow to deep is subjected to a heating process, when the temperature of a certain part reaches 350-400 ℃, the coal at the certain part can be subjected to insufficient pyrolysis to release volatile matters, and the volatile matters can be subjected to sufficient pyrolysis to generate H when passing through the surface of the granular coal and the shallow high-temperature area in the overflow process₂And activated granular carbon, H₂The iron oxide in the pellets is reduced after overflowing the surface of the granulated coal and entering the gap of the high-temperature material layer, and the active granular carbon stays on the surface and shallow layer of the stagnant granular carbon generated by the granulated coal.

H generated by fully pyrolyzing granular coal in a material layer of a rotary kiln hydrogen metallurgy roasting area₂The produced high-temperature dead granular carbon with active granular carbon can roll along with the material layer and directly serve as a reducing agent for reducing iron oxide in a hot state. H₂H produced after reduction of iron oxides₂The O and the high-temperature stagnant granular carbon with the active granular carbon carry out carbon gasification reaction to generate H₂And CO, H₂Then used as a reducing agent to reduce iron oxide and generate new H₂Produce a severe coupling effect; due to the selectivity of the chemical reaction, the majorityThe CO will overflow from the inside of the bed and be used as fuel in the combustion space of the rotary kiln.

Only when the volatile matter of the granular coal in the material layer is completely separated out, the iron oxide in the pellets and the high-temperature dead carbon are carried out by CO₂A series of metallurgical reduction reactions taking carbon gasification reaction as a core.

The coal pyrolysis hydrogen reduction process inside the rotary kiln hydro-metallurgy roasting zone material layer comprises the following steps: in high volatile coal such as brown coal, the content of hydrogen element is 4-5%, and H is obtained by fully pyrolyzing coal₂About 70 percent of the intermediate energy is used for reducing iron ore, and the part H₂About 40% of oxygen elements in iron oxides in the pellets can be removed, and the process is called as a coal pyrolysis hydrogen reduction process.

The carbon gasification hydrogen reduction process inside the rotary kiln hydro-metallurgical roasting zone material layer comprises the following steps: h produced by coal pyrolysis₂Reduction of iron oxide to produce H₂O，H₂The O and the high-temperature stagnant granular carbon with the active granular carbon are subjected to carbon gasification reaction to generate H₂And CO, H₂Reducing iron oxide as reducing agent to obtain H₂O will gasify carbon to generate new H₂And co. Due to the selectivity of chemical reaction, only a small part of CO generated in the process participates in the reaction of reducing iron oxide, most of CO is discharged into a hearth to be used as fuel, and about 50% of oxygen elements in iron oxide in the pellets can be removed through the process, so that the process is called as a carbon hydrogen gasification reduction process.

The carbon reduction process inside the material layer of the rotary kiln hydrogen metallurgy roasting area comprises the following steps: only when the volatile matters in the granulated coal are separated out to a certain degree, the iron oxide in the pellets and the high-temperature dead granular carbon with active granular carbon are subjected to CO treatment₂The reduction rate of iron oxide in the pellet is only about 10% in the series of metallurgical reduction reactions taking carbon gasification reaction of a gasifying agent as a core, and the process is called as a carbon reduction process.

In the "coal pyrolysis hydrogen reduction process", H produced by coal pyrolysis₂The heat consumption of which generally does not exceed 17KJ/mol, but forThe reduction rate of iron oxide in the pellets is about 40%. Compared with the carbon-based reduction process, the energy saving rate of the hydrogen-based reduction process is close to 80 percent; because, the carbon-based reduction process is carried out by using CO₂The carbon gasification reaction as a gasification agent is a series of metallurgical reaction processes taking the core, the carbon gasification reaction is a strong endothermic reaction, and 82.9kJ of heat is consumed for generating 1mol of CO.

In the "reduction of carbon hydrogen gas", H₂O is used as a gasifying agent to carry out carbon gasification reaction to generate H₂And CO, the carbon gasification reaction (C + H)₂O→CO+H₂Endothermic ratio of-124.5 KJ/mol) as CO₂Carbon gasification reaction (C + CO) as gasifying agent₂→ 2CO-165.8 kJ/mol) is reduced by 25%, but the process yields H₂The reduction rate of the iron oxide in the pellet is about 50%. Compared with the carbon-based reduction process, the energy saving rate of the hydrogen-based reduction process is 25%.

In the hydrometallurgical rotary kiln, because the prior mode that the granulated coal enters the material layer of the hydrometallurgical roasting area and the heat transfer characteristic of the combustion space to the material layer surface and the material layer interior determine that the coal pyrolysis hydrogen reduction process and the carbon gasification hydrogen reduction process exist in the pellet reduction process, and are interwoven together and mutually coupled in a thermal state. Compared with carbon-based reduction, the energy saving rate of the whole reduction process is more than 40%, and compared with the traditional iron-making process of iron burning, the energy saving rate of the hydrogen-based reduction and melting separation process is more than 50%.

The utility model discloses the calcination in-process of pelletizing in hydrogen metallurgy rotary kiln, the ignition loss rate of pelletizing is generally 23-29%, pellet ignition loss and pea coal consumption will all turn into combustible gas, H₂The CO is about 97 percent, a small amount of tar, benzene, naphthalene, alkane, alkene, hydrocarbon and the like exist, combustible gas overflows from the pellet bed and serves as high-temperature gas fuel for the rotary kiln, the heat released by the fuel in the combustion process can meet the heat requirement of the rotary kiln, and the residual energy recovery device such as a high-temperature waste heat boiler is required to be arranged outside the system for recovery without external fuel supply.

The utility model discloses any granule coal that gets into high temperature bed of material is its in the intensification processThe surface receives the radiation heat transfer of the peripheral high-temperature materials, the heat received by the surface is conducted to the core part, and the conduction is the slowest in the radiation, convection and conduction modes of the heat transfer; therefore, the temperatures of the deep layer and the core part of the coal particles are delayed from those of the surface layer and the shallow layer in the temperature rise process, and the delay time is longer as the coal particle size is larger. The utility model is improved to H₂The effective utilization rate of the coal is controlled by adjusting the size fraction range of the coal granules₂The escape speed and the particle size of the granular coal are generally selected to be 10-30 mm.

The utility model discloses iron ore reduction is established on the hydrogen metallurgy basis, and the technology energy consumption of rotary kiln is used for reducing iron oxide and the effective heat that the material physics heaied up greatly to reduce promptly, means under the prerequisite of same heat transfer capacity, and the productivity can promote by a wide margin. More importantly, the reaction temperature point of hydrogen metallurgy is low, iron oxide is reduced at lower temperature, and the temperature is lower when active particle carbon participates; because the heat transfer quantity depends on the difference between the temperature of the combustion space and the temperature of the material, more heat can be transferred into the material layer under the same temperature of the combustion space, and the use efficiency of the heat is improved.

The utility model discloses a sufficient pyrolysis process and the iron ore metallurgy reduction process of coal are at the high integration of hot attitude, and whole ironmaking process only adopts high volatile coals such as brown coal, no longer needs the coking coal. The reduction of iron oxides is converted from the traditional metallurgical coke-based carbon metallurgy process to "H" iron₂The hydrogen metallurgy process mainly comprising activated granular carbon achieves the purposes of energy conservation and emission reduction of the iron making process.

The utility model discloses compare in prior art's beneficial effect do:

(1) reduction of iron ore to H₂Is mainly and easily obtained

A large amount of H is generated after the volatile components of the coal in the material layer are fully pyrolyzed₂，H₂Formation of gaseous H after reduction of iron oxides₂O，H₂Gasifying carbon O and generating new H₂And CO; due to the selectivity of the chemical reaction, H is used in the whole reduction process₂Reduced mainly to H₂Easy to obtain and use in production, and realizes the full pyrolysis of coalThe thermal state intersection with the iron oxide reduction process.

(2) High heat transfer efficiency, high reduction speed and high productivity in hydrogen metallurgy

The reaction temperature point of hydrogen metallurgy is low, more heat of the material layer can be introduced at the same combustion space temperature, so that the reduction speed of the pellets is accelerated, the process energy consumption is low, and the productivity can be greatly improved on the premise of the same heat transfer quantity.

(3) Realize essential energy conservation

H generated by fully pyrolyzing coal volatile matter₂The heat consumption of which generally does not exceed 17KJ/mol, H₂The heat consumption of the O-gasified carbon is 124.5KJ/mol, and the CO consumption is₂The heat consumption of the gasified carbon is up to 165.8 KJ/mol; compared with the carbon metallurgy process, the energy saving rate of the whole hydrogen metallurgy process is more than 40 percent; through measurement and calculation, compared with the traditional iron burning process, the energy saving rate of the hydrogen metallurgy and melting separation process is over 50 percent.

(4) Achieving substantial emission reduction

The utility model uses high volatile coal, the fixed carbon content is low, the hydrogen element content is high, and the reduction process of the pellet metallurgy uses H₂Mainly CO in the discharged flue gas₂The content is greatly reduced compared with the traditional 'iron burning' process.

(5) Implementing intrinsic safety

In the pellet reduction process of the utility model, H₂Ready to produce and use, without involving H₂The preparation, storage, transportation and other links of the method are realized, and the intrinsic safety is realized.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The reference numerals have the following meanings: 1. a rotary kiln; 2. a chain grate machine; 4. an oxygen-free cooling device; 5. a slag iron melting and separating device; 6. a dry magnetic separator; 7. dry grinding and dry separation device; 8. a cold pressing device; 9. a particle size classifier; 10. a dust removal device; 11. a hot blast stove; 12. a concentrate dryer; 13. adjusting the temperature in the room; 14. a waste heat boiler; 15. a kiln back fan; 16. a blower; 17. pelletizing; 18. a smoke extractor.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

As shown in fig. 1, the coal-based hydrogen metallurgy device of the iron ore rotary kiln comprises a rotary kiln 1, and a chain grate 2, an oxygen-free cooling device 4 and a slag iron melting device 5 which are respectively connected with the rotary kiln 1, wherein a gas discharge port of the rotary kiln 1 is communicated with a gas inlet of the chain grate 2; the outlet end of the anaerobic cooling device 4 is provided with a dry magnetic separator 6, the pellet discharge port of the dry magnetic separator 6 is communicated with a dry grinding and dry separating device 7, the discharge port of the dry grinding and dry separating device 7 is also provided with a cold pressing device 8, and the carbon discharge port of the dry magnetic separator 6 is communicated with a particle size classifier 9.

And the exhaust ports of the chain grate 2 are respectively communicated with a dust removal device 10 and a hot blast stove 11, and the exhaust ports of the hot blast stove 11 are respectively communicated with the high-temperature gas inlets of the rotary kiln 1, the slag iron melting and separating device 5 and the concentrate dryer 12.

A dust removal device 10 and a temperature adjusting room 13 are arranged between the chain grate 2 and the rotary kiln 1.

The slag iron melting and separating device 5 and the concentrate drying machine 12 are respectively connected with a waste heat boiler 14, and a dust removal device 10 is further arranged between the slag iron melting and separating device 5 and the waste heat boiler 14.

And a kiln back air blower 15 is arranged on the rotary kiln 1.

And a dust removal device 10 is arranged at an exhaust port of the waste heat boiler 14.

And air inlets of the hot blast stove 11, the temperature adjusting chamber 13 and the waste heat boiler 14 are respectively communicated with a blower 16.

The utility model discloses an application method in iron ore rotary kiln coal-based hydrogen metallurgy is as follows:

(1) pelletizing materials:

iron ore with the granularity of-200 meshes and accounting for about 70 percent, a binder and a liquid-phase quenching and tempering agent are mixed according to the weight ratio of 100: 2-3: 0.5-1 of the ingredients are mixed evenly, and then a pelletizer 17 is adopted to add water for pelletizing to obtain wet pellets with the granularity phi of 10-20 mm;

(2) drying and preheating pellets:

paving the wet balls on a chain grate machine 2, introducing high-temperature flue gas with the temperature of about 1000 ℃ in a temperature adjusting chamber 13 into the chain grate machine 2 to dry and preheat the wet balls, and discharging the flue gas which is dedusted and purified by a dedusting device 10 and discharged by a smoke exhaust machine 18;

(3) feeding materials into a kiln:

the pellets are dried and preheated to 800-900 ℃ on a grate 2, and are respectively added into a rotary kiln 1 from a feeding end with dead granular carbon with the granularity of 1-30 mm; spraying highly volatile coal with the granularity of 10-30mm to the front part and the middle part of the roasting area of the rotary kiln 1 from the discharge end of the rotary kiln 1; adding 0-1mm of stagnant powdered carbon into the rear part of a roasting area of a rotary kiln from a discharge end of the rotary kiln 1;

(4) roasting materials in a hydrogen metallurgy mode:

the mixed material consisting of the pellets and the stagnant granular carbon is heated in the rolling process in the kiln after entering the rotary kiln 1, the time of the pellets in the kiln is 40-50min, and the temperature of the combustion space in the rotary kiln 1 is 1100-;

(5) melting and cooling the materials to obtain a product:

respectively adding the high-temperature materials of 950-plus-one temperature of 1000 ℃ obtained in the step (4) into the slag-iron melting and separating device 5 and the oxygen-free cooling device 4, and melting and separating the materials added into the slag-iron melting and separating device 5 to obtain slag A and molten iron B; and (3) cooling the material added into the anaerobic cooling device 4, introducing the cooled material into a dry magnetic separator 6 to obtain cold-state metallized pellets and stagnant carbon, carrying out slag-iron separation on the obtained cold-state metallized pellets by a dry grinding and dry separation device 7 at normal temperature to produce high-purity metallized iron powder, and carrying out cold pressing by a cold pressing device 8 to obtain cold-pressed iron blocks C.

And (4) high-temperature gas overflows from the mixed material in the roasting process in the rotary kiln 1, part of the high-temperature gas is subjected to combustible component treatment and temperature adjustment after gravity settling and cyclone dust removal to obtain about 1000 ℃, and then the high-temperature gas is introduced into the grate 2 as a heat source, part of the high-temperature gas is introduced into the rotary kiln 1 and the iron slag melting device 5 through the hot blast stove 11 respectively as the heat source, and part of the high-temperature gas is introduced into the concentrate dryer 12 through the hot blast stove 11 and then is introduced into the waste heat boiler 14 together with demineralized water to generate high-temperature high-.

In the step (5), the melting component adopts dead carbon as a fuel for physical temperature rise and melting of the high-temperature metallized pellets and a reducing agent for final reduction.

And (4) screening the stagnant carbon obtained in the step (5) by a particle size classifier 9 to obtain stagnant granular carbon and stagnant powdered carbon which are used as a reducing agent and fuel ingredients of the rotary kiln for recycling.

And (4) discharging the flue gas generated in the steps (2) and (4) after dust removal and purification.

Claims (7)

1. The utility model provides an iron ore rotary kiln coal-based hydrogen metallurgy device which characterized in that: the device comprises a rotary kiln (1), and a chain grate (2), an oxygen-free cooling device (4) and a slag iron melting and separating device (5) which are respectively connected with the rotary kiln (1), wherein a gas discharge port of the rotary kiln (1) is communicated with a gas inlet of the chain grate (2); the outlet end of the anaerobic cooling device (4) is provided with a dry magnetic separator (6), the pellet discharge port of the dry magnetic separator (6) is communicated with a dry grinding and dry separation device (7), the discharge port of the dry grinding and dry separation device (7) is also provided with a cold pressing device (8), and the carbon discharge port of the dry magnetic separator (6) is communicated with a particle size classifier (9).

2. The iron ore rotary kiln coal-based hydrogen metallurgy device according to claim 1, characterized in that: and the exhaust ports of the chain grate (2) are respectively communicated with a dust removal device (10) and a hot blast stove (11), and the exhaust ports of the hot blast stove (11) are respectively communicated with the high-temperature gas inlets of the rotary kiln (1), the slag iron melting and separating device (5) and the concentrate dryer (12).

3. The iron ore rotary kiln coal-based hydrogen metallurgy device according to claim 2, characterized in that: and a dust removal device (10) and a temperature adjusting chamber (13) are arranged between the chain grate (2) and the rotary kiln (1).

4. The iron ore rotary kiln coal-based hydrogen metallurgy device according to claim 3, wherein: the slag iron melting and separating device (5) and the concentrate drying machine (12) are respectively connected with the waste heat boiler (14), and a dust removal device (10) is further arranged between the slag iron melting and separating device (5) and the waste heat boiler (14).

5. The iron ore rotary kiln coal-based hydrogen metallurgy device according to claim 4, wherein: and a kiln back fan (15) is arranged on the rotary kiln (1).

6. The iron ore rotary kiln coal-based hydrogen metallurgy device according to claim 5, wherein: and a dust removal device (10) is arranged at an exhaust port of the waste heat boiler (14).

7. The iron ore rotary kiln coal-based hydrogen metallurgy device according to claim 6, wherein: and air inlets of the hot blast stove (11), the temperature regulating chamber (13) and the waste heat boiler (14) are respectively communicated with the blower (16).

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