KR20120001984U - Reduction firing apparatus - Google Patents

Abstract

The present invention provides a reducing and roasting device. The reduction roasting apparatus includes a double chamber stepping reduction furnace, a single chamber stepping reduction furnace, and a single combustion chamber down draft type reduction furnace. The double chamber stepping reduction furnace includes a left chamber, a right chamber, a raw material loading device, a stepping unit, a slag discharge device, a raw material supply device, a heating burner, an exhaust passage, a drawing device, and a sealing cover. Tank and slag discharge passage. The reducing and roasting apparatus of the present invention is applied to the production of direct reduced iron, which has a small resource limit, low energy consumption, eco-friendliness, high productivity, low production cost, high metallization rate, long service life of the device, Production coverage has a wide range of effects.

Description

Reduction roasting apparatus {REDUCTION FIRING APPARATUS}

The present invention relates to the field of metallurgy technology, and more particularly to a reducing roaster.

As coking coal suitable for coking is depleted and the demand for environmental protection is increasing, it is inevitable to replace traditional furnace steel with Direct Reduced Iron (DRI). Until now, research on the production of direct reduced iron has been carried out continuously, and it is directly carried out by the shaft furnace process, the tunnel kiln method, the rotary kiln method, the rotary hearth furnace method, and the like. Reduced iron was produced, and a method of producing reduced iron directly by using a downstream roasting method in a sintering machine was also proposed.

The shaft furnace roasting method has a problem in that "scaffolding phenomenon" occurs because raw material is difficult to discharge and affects productivity. Tunnel kiln roasting method has a long heating time and high energy consumption problems. Rotating kiln roasting method also has a long heating time and easily breaks down due to the "ringing phenomenon". The rotary furnace roasting method has low thermal efficiency, high energy consumption, and low productivity. . The roasting method in the sintering machine has a problem that it is difficult to control the reducing gas atmosphere and increase the reducing temperature. Conventional direct reduction iron production methods are in most cases less competitive than steel mills due to resource limitations, high energy consumption and low productivity.

Although the invention of Chinese Patent Publication No. CN1080961A discloses a "Process and apparatus for reducing spongy iron in coal-base shaft furnace", the method is a conventional shaft. A grid plate was added to the furnace to improve the gas permeability to achieve coal reduction, which has more disadvantages than the conventional shaft furnace method. The molten smelting raw material adheres to the walls of the blast furnace, causing "hog formation", which makes it difficult to discharge the raw material and ensures that the production proceeds smoothly. It is necessary to slide down the grating, but the smelting raw material will It is difficult to slide, and the temperature of the smelting raw material in contact with the grid is the highest, so that it is easily melted and adhered to the grid, making it more difficult to slide downward. Can't.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a reducing and roasting apparatus applied to a method for producing direct reduced iron.

According to one technical scheme used to solve the above technical problem in the present invention, in a double chamber stepping reduction furnace, a left chamber having a raw material inlet end with a gate and a raw material outlet end, and a raw material inlet end with a gate And a right chamber having a raw material extraction end, a raw material loading device for loading the raw material with a slit formed at the bottom, a stepping unit for transferring while supporting the raw material loading device for stepping in the chamber, and raw material entry in the left and right chambers. The slag discharge device installed at the end, the raw material inlet end of the left / right chamber, the raw material supply device located at the rear side of the slag discharge device in the chamber length direction, the heating burner installed in the left / right chamber, and the left / right chamber Exhaust passages installed in the lower part and communicating with the left and right chambers through slits formed at the bottom of the raw material loading device, and the left and right chambers A drawer installed outside the gate of the material lead-out end, a tank provided outside the gate of the material lead-out end of the left and right chambers and provided with a sealing cover, and a slag provided below the raw material entry end of the left and right chambers. It may include a slag discharge passage provided to correspond to the discharge device and the raw material supply device up and down.

According to another technical solution used to solve the above technical problem in the present invention, in a single chamber stepping reduction furnace, a chamber having a raw material inlet end and a material outlet end with a gate, and a raw material having a slit at the bottom A raw material loading device for loading, a stepping unit for transporting and supporting the raw material loading device to step in the chamber, a slag discharge device provided at the raw material entry end of the chamber, and a slag discharged in the chamber longitudinal direction at the raw material entry end of the chamber. A raw material supply device located at the rear of the device, a heating burner installed in the chamber, an exhaust passage communicated with the chamber through a slit formed at the bottom of the raw material loading device installed at the bottom of the chamber, and a raw material entry end / raw material exit end of the chamber. A drawer installed outside of the gate of the gate and a sealer installed outside the gate of the raw material extraction end of the chamber It may include a tank provided with a burr, and a slag discharge passage provided in the lower portion of the raw material entry end of the chamber and provided to correspond to the slag discharge device and the raw material supply device.

According to another technical solution used to solve the above technical problem in the present invention, in a single combustion chamber down-draft type reduction furnace, a combustion chamber provided with one gate, a heating burner installed in the combustion chamber, A raw material loading device for loading the raw material with a slit at the bottom, an exhaust passage installed in the lower part of the combustion chamber and communicating with the combustion chamber through the slit formed at the bottom of the raw material loading device, and a withdrawal device provided outside the gate of the combustion chamber; It includes a tank provided with a sealing cover, a slag discharge device and a raw material supply device arranged side by side with the combustion chamber.

The beneficial effects of the present invention are as follows. First, ① high-temperature smoke passes through the raw material layer to realize heat transfer to the pellet raw material reduced in two ways, thermal radiation and heat conduction, thereby improving the thermal efficiency. In addition, when the smoke passes through the raw material layer, the gas produced in the process of reducing the pellet raw material is rapidly replaced, so the reduction efficiency is high and the energy consumption is low. ② The high-temperature smoke first passes through the raw material layer and transfers most of the heat to the reduced pellet raw material, and then reaches the grate bar of the raw material loading device. After pouring the reduced pellet raw material, the raw material loading device is immediately transferred into the reduction furnace, and the raw material loading device can be effectively used to improve the service life. ③ The production efficiency of the double chamber stepping reduction furnace is high because the raw material loading device can be easily replaced and repaired under the premise of not interrupting the production and changing the rhythm of the production. (4) The raw material loading device is protected by slag so that the reducing material can be prevented from adhering to the great bar of the material loading device. In addition, loading and unloading the raw materials is only a simple tilting operation, and thus it is easy to ensure that the reduction and roasting operation proceeds smoothly. (5) Since the reduction temperature and reducing atmosphere can be precisely controlled, the metal reduction efficiency is high, the range of application to the production is low, and the production cost is low.

1 is a cross-sectional view taken in the longitudinal direction of a double chamber stepping reduction furnace or a single chamber stepping reduction furnace of a reduction roasting apparatus of the present invention.
Figure 2 is a cross-sectional view DD cut in the transverse direction of the double chamber stepping reduction furnace of the reduction roasting apparatus of the present invention.
3 is a cross-sectional view of a single combustion chamber down draft type reduction furnace of the reduction roasting apparatus of the present invention.

The objects and effects of the present invention, and the technical configurations for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of structures, roles, functions, and the like in the present invention, which may vary according to intentions or customs of users and operators.

However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. Only the embodiments are provided so that the disclosure of the present invention is complete, and to completely inform the scope of the invention to those of ordinary skill in the art to which the present invention belongs, the present invention is only described in the claims It is only defined by the scope of the claims. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals refer to like elements throughout.

On the other hand, in the embodiment of the present invention, each of the components, functional blocks or means may be composed of one or more sub-components, the electrical, electronic, mechanical functions performed by each component is an electronic circuit, It may be implemented by various known elements or mechanical elements such as an integrated circuit, an application specific integrated circuit (ASIC), each of which may be implemented separately, or two or more may be integrated into one.

Hereinafter, the reducing and roasting apparatus of the present invention will be described in detail with reference to the accompanying drawings and examples.

Example 1

As shown in Figure 1 and 2, the reduction and roasting apparatus of the present invention may be a double chamber stepping reduction furnace, the left chamber 11 having a raw material inlet end and a material takeout end provided with a gate (3), A right chamber 12 having a raw material entry end with a gate 3 and a raw material withdrawal end; a raw material loading device 7 for loading raw materials with slits formed at the bottom; and a raw material loading device for stepping in the chamber ( 7) the stepping unit 5 for conveying while supporting, the slag discharge device 10 provided in the raw material inlet end of the left and right chambers 11 and 12, and the raw material inlet end of the left and right chambers 11 and 12; A raw material supply device 9 installed at the rear side of the slag discharge device 10 in the chamber longitudinal direction, a heating burner 6 provided at the left / right chambers 11 and 12, and a left / right chamber 11, 12 and the left and right chambers (11, 12) and through the slit formed at the bottom of the raw material loading device (7) The exhaust passage 4 communicated with each other, the drawing device 1 provided outside the gate 3 of the raw material extraction end of the left and right chambers 11 and 12, and the raw material taking out of the left and right chambers 11 and 12; A slag discharge device 10 and a raw material supply device, which are installed outside the gate 3 at the end and are provided at the lower part of the raw material entry end of the left and right chambers 11 and 12, and the tank 2 having a sealing cover. (9) and the slag discharge passage (8) provided to correspond to up and down.

The left chamber 11 and the right chamber 12 are arranged in parallel or side by side, and the raw material entry end of the left chamber 11 is aligned with the raw material withdrawal end of the right chamber 12, and likewise of the right chamber 12 The raw material entry end is aligned with the raw material withdrawal end of the left chamber 11.

The bottom of the raw material loading device (7) is equipped with a great bar (grate bar), the slit penetrating up and down between the great bar is formed and can withstand the impact of the raw material, high temperature baking and high temperature airflow.

In the present invention, the raw material loading device 7 has a left wall composed of a blocking wall fixed to the left side, a right wall composed of a blocking wall fixed to the right side, and a movement fastened to the front pedestal with a front support beam and a screw. A front wall consisting of a possible front blocking wall, a rear wall consisting of a movable rear blocking wall fastened to the rear support with a rear pedestal and a screw, and a bottom composed of a plurality of great bars having slit penetrating up and down. Further, the front end of the plurality of great bars is installed between the front pedestal and the movable front blocking wall, and the rear end of the great bar is installed between the rear pedestal and the movable rear blocking wall. Among them, the left / right wall and the front / rear pedestal are entirely formed of a frame type support sheet. Among them, the barrier wall, the pedestal and the great bar may be formed of a material having high temperature and impact resistance, and for example, may be made of a structure made of steel and a refractory material bonded to the outer surface of the structure made of steel. .

The stepping pitch of the stepping unit 5 is equal to the length of the raw material loading device 7.

Hereinafter, the specific use of the double chamber stepping reduction furnace of the reduction roasting apparatus of the present invention will be described.

As shown in FIGS. 1 and 2, the takeout device 1 transfers the empty raw material loading device 7 to the raw material inlet end of the left chamber 11 (or the right chamber 12) of the stepping reduction furnace after unloading. When the raw material loading device 7 is supported by the stepping unit 5 and moves forward, and the raw material loading device 7 is transferred to the slag discharge station, the slag discharge device 10 causes the grading of the raw material loading device 7 to be great. The slag is uniformly covered on the bar, and when the raw material loading device 7 is transferred to the raw material loading station, the raw material supply device 9 loads the pellet material to be reduced in the raw material loading device 7, When slag is discharged and loaded, the raw material or slag separated from the great bar of the raw material loading device 7 accumulates in the slag discharge passage 8, and after a predetermined time, the valve installed at the end of the slag discharge passage 8 is opened. From slag discharge passage (8) Remove fallen raw material or slag. The raw material loading device 7 gradually moves to the preheating station, the heating station, and the reducing station, and heats the pellet raw material in the raw material loading device 7 with the flame of the heating burner 6, and the smoke of the flame is the pellet raw material layer and the raw material. It passes through the great bar of the loading apparatus 7 and is discharged by the exhaust passage 4 installed in the stepping reduction chamber chamber bottom. When the raw material loading device 7 moves to the gate 3 of the raw material extraction end of the stepping reduction furnace, all the pellet raw materials in the raw material loading device 7 are reduced, and at this time, the gate 3 is opened to the take-out device 1. Thereby, the raw material loading device 7 and the pellet raw material loaded in the raw material loading device 7 are taken out from a stepping reduction furnace chamber. Thereafter, the gate 3 is closed, and the sealing cover of the tank 2 with the sealing cover is opened to remove the reduced pellet raw material in the raw material loading device 7 by the take-out device 1 with the sealing cover. After pouring into (2), the sealing cover of the tank 2 provided with the sealing cover is closed. The takeout device 1 moves the raw material loading device 7 back to its original state and then moves horizontally to move the empty raw material loading device 7 to the right chamber 12 (or left chamber 11) of the stepping reduction furnace. Transfer to the raw material inlet end. Accordingly, the raw material loading device 7 enters the next operation cycle.

Example 2

As shown in FIG. 1, the reduction and roasting apparatus of the present invention may be a single chamber stepping reduction furnace, a chamber having a raw material inlet end and a material outlet end provided with a gate 3, and a slit formed at the bottom thereof, A raw material loading device (7) for loading the material, a stepping unit (5) for transporting the raw material loading device (7) while stepping in the chamber, a slag discharge device (10) provided at the raw material entry end of the chamber, and the chamber A raw material supply device 9 installed at the raw material inlet end of the chamber and located at the rear side of the slag discharge device 10 in the chamber longitudinal direction, a heating burner 6 provided in the chamber, and a raw material loading device 7 installed at the lower part of the chamber. Exhaust passage (4) communicating with the chamber through slits formed at the bottom of the head), the withdrawal device (1) provided outside the gate (3) of the raw material entry end and the material takeout end of the chamber, and the material takeout end of the chamber. Is installed outside the gate (3) It includes a tank (2) provided with a sealing cover, and a slag discharge passage (8) provided at a lower portion of the raw material entry end of the chamber and provided up and down with the slag discharge device (10) and the raw material supply device (9).

The bottom of the raw material loading device (7) is equipped with a great bar (grate bar), the upper and lower slit is formed between the great bar and can withstand the impact of the raw material, high temperature baking and high temperature airflow.

The stepping pitch of the stepping unit 5 is equal to the length of the raw material loading device 7.

Hereinafter, the specific use of the single chamber stepping reduction furnace of the reduction roasting apparatus of the present invention will be described.

As shown in FIG. 1, the take-out apparatus 1 transfers the empty raw material loading device 7 to the raw material entry end of the stepping reduction furnace after unloading, and the raw material loading device 7 is moved by the stepping unit 5. When the raw material loading device 7 is transferred to the slag discharge station while being supported, the slag discharge device 10 uniformly covers the slag on the great bar of the raw material loading device 7 by the slag discharge device 10. When 7) is transferred to the raw material loading station, the raw material supply device 9 loads the pellet raw material to be reduced in the raw material loading device 7 and moves the raw material away from the great bar of the raw material loading device 7 during slag discharge and raw material loading. The slag is accumulated in the slag discharge passage 8, and after a predetermined time, the valve installed at the end of the slag discharge passage 8 is opened to remove the raw material or slag away from the slag discharge passage 8. The raw material loading device 7 gradually moves to the preheating station, the heating station, and the reducing station, and heats the pellet raw material in the raw material loading device 7 with the flame of the heating burner 6, and the smoke of the flame is the pellet raw material layer and the raw material. It passes through the great bar of the loading apparatus 7 and is discharged by the exhaust passage 4 installed in the stepping reduction chamber chamber bottom. When the raw material loading device 7 moves to the gate 3 of the raw material extraction end of the stepping reduction furnace, all the pellet raw materials in the raw material loading device 7 are reduced, and at this time, the gate 3 is opened to the takeout device 1. Thereby, the raw material loading device 7 and the pellet raw material loaded in the raw material loading device 7 are taken out from a stepping reduction furnace chamber. Thereafter, the gate 3 is closed, and the sealing cover of the tank 2 with the sealing cover is opened to remove the reduced pellet raw material in the raw material loading device 7 by the take-out device 1 with the sealing cover. After pouring into (2), the sealing cover of the tank 2 provided with the sealing cover is closed. The take-out apparatus 1 returns the raw material loading device 7 to its original state and then moves horizontally to transfer the empty raw material loading device 7 to a trolley installed in parallel with the chamber, and then the raw material by the trolley. The loading device 7 is transported to the side of the raw material entry end of the stepping reduction furnace chamber, and the raw material loading device 7 is again transferred to the raw material entry end of the stepping reduction furnace chamber by the takeout device 1. Accordingly, the raw material loading device 7 enters the next operation cycle.

Example 3

As shown in FIG. 3, the reduction and roasting apparatus of the present invention may be a single hearth down draft type reduction furnace, a combustion chamber 13 in which one gate 3 is installed, and a combustion chamber 13. A heating burner 6 installed at the bottom), a raw material loading device 7 for loading raw materials, and a slit formed at the bottom of the combustion chamber 13 and having a slit formed at the bottom thereof. An exhaust passage 4 communicating with the combustion chamber 13 through the tank, a drawer 1 provided outside the gate 3 of the combustion chamber 13, a tank 2 provided with a sealing cover, and the combustion chamber 13 It may include a slag discharge device and a raw material supply device arranged.

The bottom of the raw material loading device (7) is equipped with a great bar (grate bar), the slit penetrating up and down between the great bar is formed and can withstand the impact of the raw material, high temperature baking and high temperature airflow.

A single combustion chamber down draft type reduction furnace is provided with one of the heating burners 6 to ignite, adjust and extinguish the flames of the heating burners 6 at different times to obtain a target reduction temperature and a reducing atmosphere.

Hereinafter, the specific use of the reduction furnace of the single combustion chamber down draft type of the reduction roaster of the present invention will be described.

As shown in FIG. 3, the take-out apparatus 1 moves the empty raw material loading device 7 laterally after unloading to the lower part of the slag discharge device installed outside the reduction furnace, thereby providing a great material for the raw material loading device 7. The slag is uniformly covered on the bar, and the take-out device 1 moves horizontally to the lower part of the raw material supply device installed outside the reduction furnace to load the pellet raw material to be reduced in the raw material loading device 7, and the take-out device ( 1) transversely moves forward of the gate 3 of the combustion chamber 13. Thereafter, the gate 3 is opened, and the extraction apparatus 1 transfers the raw material loading apparatus 7 into the combustion chamber 13, and then closes the gate 3 to burn the flame of the heating burner 6. Ignition and control are used to heat the pellet raw material in the raw material loading device 7 with the flame of the heating burner 6. The smoke of the flame passes through the pellet raw material layer and the great bar of the raw material loading device 7 and is discharged by the exhaust passage 4 provided at the bottom of the combustion chamber 13. Thereafter, the flame of the heating burner 6 is extinguished so that the pellet raw material in the raw material loading device 7 is reduced in the combustion chamber 13. After the reduction to the target degree, the gate 3 is opened and the raw material loading device 7 is taken out of the combustion chamber 13 by the take-out device 1. Thereafter, the sealing cover of the tank 2 with the sealing cover is opened and the reduced pellet raw material in the raw material loading device 7 is poured into the tank 2 with the sealing cover by the take-out device 1. The sealing cover of the tank 2 provided with the sealing cover is closed. Thereafter, the takeout device 1 returns the raw material loading device 7 to its original state and then moves horizontally to transfer the empty raw material loading device 7 to the lower portion of the slag discharge device installed outside the reduction furnace. It enters the working cycle.

The raw materials used in the present invention may be granulated raw materials and lumps in addition to pellets of ore, and those skilled in the art may include all metal oxides and reducing agents that can be reduced by a reduction roasting process, as well as adhesives. It can also be understood that it may include. For example, the pellet ore in the raw material may be composed of a conventional iron ore, metal oxides such as vanadium titano-magnetite ore and nickel oxide, a reducing agent and an adhesive. That is, since the reduction temperature and the reduction time of all metal oxides that can be reduced by the reduction roasting process can be calculated by conventional metallurgy thermodynamic or dynamic theory, those skilled in the art have some technical parameters of the present invention according to the device of the present invention. The metal oxide can be reduced and produced simply by changing the parameters (e.g., by setting the reduction temperature and reduction time of the reduction and roasting apparatus, or by controlling the context in which the fuel is burned in the heating burner).

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may realize that the present invention may be implemented in other specific forms without changing the technical spirit or essential features. I can understand that. For example, those skilled in the art can change the material, size, etc. of each component according to the application field, or combine or replace the disclosed embodiments in a form that is not clearly disclosed in the embodiments of the present invention, but this also It does not depart from the scope of the invention. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that these modified embodiments are included in the technical idea described in the claims of the present invention.

1: take-out device 2: tank with sealing cover
3: gate 4: exhaust passage
5: stepping unit 6: heating burner
7: Raw material loading device 8: slag discharge passage
9: raw material supply device 10: slag discharge device
11: left chamber 12: right chamber
13: combustion chamber

Claims (10)

In the reducing roaster which is a double chamber stepping reduction furnace,
A left chamber 11 having a raw material entry end and a raw material withdrawal end provided with a gate 3;
A right chamber 12 having a raw material entry end and a raw material extraction end provided with a gate 3;
A raw material loading device 7 for loading raw materials with slits formed at the bottom;
A stepping unit 5 for transporting while supporting the raw material loading device 7 so as to step in the left and right chambers 11 and 12,
A slag discharge device 10 installed at the raw material entry ends of the left and right chambers 11 and 12,
The raw material supply device 9 installed at the raw material entry ends of the left and right chambers 11 and 12 and located at the rear side of the slag discharge device 10 in the chamber longitudinal direction;
A heating burner 6 installed in the left and right chambers 11 and 12,
An exhaust passage 4 installed below the left and right chambers 11 and 12 and communicating with the left and right chambers 11 and 12 through slits formed at the bottom of the raw material loading device 7;
A take-out apparatus 1 provided outside the gate 3 of the raw material withdrawal end of the left and right chambers 11 and 12,
A tank (2) provided outside the gate (3) of the raw material extraction end of the left and right chambers (11, 12) and having a sealing cover;
A slag discharge passage 8 disposed below the raw material entry end portions of the left and right chambers 11 and 12 and provided to correspond to the slag discharge device 10 and the raw material supply device 9 up and down; Characterized
Reduction roasting device. The method of claim 1,
The left chamber 11 and the right chamber 12 are arranged side by side, and the raw material inlet end of the left chamber 11 is arranged to be aligned with the raw material outlet end of the right chamber 12.
Reduction roasting device. The method of claim 1,
The bottom portion of the raw material loading device 7 is characterized in that a great bar (grate bar) that can withstand the impact of the raw material, high temperature baking and high temperature air flow is mounted
Reduction roasting device. The method of claim 1,
The stepping pitch of the stepping unit 5 is characterized in that the same as the length of the raw material loading device (7)
Reduction roasting device. In the reducing roasting device which is a single chamber stepping reduction furnace,
A chamber having a raw material entry end and a raw material extraction end provided with a gate 3;
A raw material loading device 7 for loading raw materials having slits at the bottom thereof;
A stepping unit 5 for transporting while supporting the raw material loading device 7 to step in the chamber,
A slag discharge device 10 installed at the raw material entry end of the chamber;
A raw material supply device 9 installed at the raw material entry end of the chamber and located at the rear side of the slag discharge device 10 in the chamber longitudinal direction;
A heating burner 6 installed in the chamber,
An exhaust passage 4 installed in the lower portion of the chamber and communicating with the chamber through a slit formed at the bottom of the raw material loading device 7;
A drawing device (1) provided outside the gate (3) of the raw material entry end / raw material extraction end of the chamber;
A tank (2) provided outside the gate (3) of the raw material extraction end of the chamber and provided with a sealing cover;
And a slag discharge passage 8 disposed below the raw material entry end of the chamber and provided upward and downward with the slag discharge device 10 and the raw material supply device 9.
Reduction roasting device. The method of claim 5,
The bottom portion of the raw material loading device 7 is characterized in that a great bar (grate bar) that can withstand the impact of the raw material, high temperature baking and high temperature air flow is mounted
Reduction roasting device. The method of claim 5,
The stepping pitch of the stepping unit 5 is characterized in that the same as the length of the raw material loading device (7)
Reduction roasting device. In a reducing furnace which is a reducing furnace of a single combustion chamber down draft type,
Combustion chamber 13 provided with one gate 3,
A heating burner 6 installed in the combustion chamber 13,
A raw material loading device 7 for loading raw materials with slits formed at the bottom;
An exhaust passage 4 installed in the lower portion of the combustion chamber 13 and communicating with the combustion chamber 13 through a slit formed at the bottom of the raw material loading device 7;
A drawer (1) installed outside the gate (3) of the combustion chamber (13) and a tank (2) provided with a sealing cover;
It characterized in that it comprises a slag discharge device and a raw material supply device arranged side by side with the combustion chamber 13
Reduction roasting device. The method of claim 8,
The bottom portion of the raw material loading device 7 is characterized in that a great bar (grate bar) that can withstand the impact of the raw material, high temperature baking and high temperature air flow is mounted
Reduction roasting device. The method of claim 8,
One of the heating burners 6 is installed, igniting, adjusting and extinguishing the flames of the heating burners 6 at different times to obtain a target reduction temperature and a reducing atmosphere.
Reduction roasting device.

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