EA033946B1 - Method and apparatus for preheating and smelting manganese ore sinter - Google Patents

Abstract

Described are a method and an apparatus for preheating and smelting manganese ore sinter. The method comprises feeding feed mixture (1) containing manganese ore sinter (2), reducing agent (3) and fluxing agent (4) into an submerged electric arc furnace (5), smelting feed mixture (1) to form a layer containing liquid manganese alloy and a layer containing slag, withdrawing liquid manganese and, discharging carbon monoxide containing carbonaceous gas (6), combusting carbon monoxide containing carbonaceous gas (6) in presence of oxygen such as air in a burner (7) to form carbon dioxide containing carbonaceous gas (9), and heating said feed mixture (1) in a pre-treatment silo (8) prior feeding said feed mixture (1) into the submerged electric arc furnace (5) with said carbon dioxide containing carbonaceous gas (9).

Description

Technical field

This invention relates to a method for preheating and smelting manganese ore sinter, as defined in the preamble of the independent claim 1 of the claims.

The invention also relates to a device for preheating and smelting manganese ore sinter, as defined in the preamble of the independent claim 14 of the claims.

The purpose of the invention

The aim of the present invention is the provision of a method and device for energy-efficient smelting of manganese ore.

SUMMARY OF THE INVENTION

The method of preheating and smelting manganese ore sinter differs in that defined in the independent claim 1 of the claims.

Preferred embodiments of this method are defined in dependent claims 2-13.

A device for preheating and smelting manganese ore sinter differs in accordance with what is defined in independent clause 14.

Preferred embodiments of this device are defined in dependent claims 15-26.

The present invention is based on preheating a feed mixture containing at least a manganese ore agglomerate and a reducing agent to remove moisture from the feed mixture and preheating the feed mixture to a temperature that can be achieved without burning or loss of carbon in the reducing agent that needed in the starting mixture for recovery purposes.

When preheating ore containing manganese limiting factor is the carbon-consuming reactions, especially the Boudouard reaction (C (sol.) + _CO2 (g) ^ 2CO (g)). The reaction of formation of water gas, Н ₂ О + С ^ Н ₂ + СО, also proceeds. Thus, during pre-heating, the local temperature in the pre-treatment hopper can be no higher than 600-700 ^o C depending on the reactivity of carbon in the reducing agent of the initial mixture. The average temperature of the hot charge in an electric oven is usually below 600oC.

Preheating the initial mixture saves electric energy in an arc furnace with a closed arc, improves its operation, improves the productivity and safety of smelting by preventing the reaction between carbon and oxygen in the initial mixture, and thus prevents uncontrolled temperature rise and, possibly, explosions.

List of drawings

Next, a method and apparatus for preheating and smelting manganese ore sinter is described in more detail with reference to the drawings, in which FIG. 1 is a flow diagram of a first embodiment and FIG. 2 depicts a flow chart of a second embodiment.

DETAILED DESCRIPTION OF THE INVENTION

First, a method for preheating the smelted manganese ore to be smelted and some preferred embodiments and variations of this method will be described in more detail.

This method includes the step of supplying the initial mixture 1, comprising at least agglomerate 2 of manganese ore, reducing agent 3 and fluxing additive 4, in an electric arc furnace 5 with a closed arc.

This method includes the stage of melting the specified initial mixture 1 in an electric arc furnace 5 with a closed arc to obtain a layer containing a liquid alloy of manganese (not shown in the drawings) and a layer containing slag (not shown in the drawings) located above a layer containing a liquid alloy Manganese

The method includes the step of selecting a liquid alloy of manganese and slag, individually or simultaneously, from an electric arc furnace 5 with a closed arc.

The method includes a first release step for discharging carbon monoxide-containing gas 6 from an electric arc furnace 5 with a closed arc.

The method includes the step of burning carbon monoxide-containing gas 6, discharged in the first stage of discharge from the electric arc furnace 5 with a closed arc, in the presence of oxygen, such as air, in the burner 7, to produce carbon dioxide-containing carbon dioxide 9.

The feeding step of this method includes the step of heating said feed mixture 1 with said carbon dioxide-containing carbon gas 9 formed in the combustion step in a pre-treatment hopper 8 before feeding the feed mixture 1 into an electric arc furnace 5 with a closed arc.

Closed-arc electric arc furnace 5, which is used in this method, is preferably an alternating current (AC) electric arc furnace 5 with a closed arc.

The burner 7 is preferably connected to the pre-treatment hopper 8, and the pre-treatment hopper 8 is preferably connected to the closed-arc electric furnace 5, so that gases, such as oxygen, from the environment are prevented from entering the burner 7, the pre-treatment hopper 8 and arc electric furnace 5 with a closed arc to avoid uncontrolled reactions of the specified source material 1.

The particle size of the agglomerate 2 of manganese ore can be from 6 to 75 mm

The method may include heating the starting mixture 1 in a heating step to a temperature in the range of 400 to 700 ° C, preferably to a temperature of 500 to 650 ° C.

The method includes, preferably, but not necessarily, controlling the temperature of said carbon dioxide-containing carbon-containing gas 9, which is used in the heating step. The temperature of said carbon dioxide-containing carbon gas 9, which is used in the heating step, can be adjusted to a value in the range of 600 to 900 ° C.

In the burner 7, carbon monoxide-containing carbon gas 6 obtained from an electric arc furnace 5 with a closed arc is preferably burned at a ratio with air below 1, for example from 0.9 to 0.95. The oxygen content (O ₂ ) in the carbon dioxide-containing carbon gas 9 obtained in the combustion step must be very low in order to minimize the oxidation of carbon in the starting mixture 1. The content of carbon monoxide (CO) and hydrogen (H ₂ ) in the dioxide-containing carbon carbon-containing gas 9 obtained in the combustion stage must be very low in order to avoid explosions in the gas lines, especially between the burner 7 and the pre-treatment hopper 8 or in the pre-treatment hopper 8.

At the stage of combustion, this method may include burning carbon monoxide-containing carbon gas 6 discharged from the arc furnace 5 with a closed arc through butane.

In the combustion step, this method may include burning carbon monoxide-containing carbon gas 6 discharged from the electric arc furnace 5 with a closed arc through gaseous CO or, for example, butane (C ₄ H ₁₀ ) so that the molar ratio of air to butane is in the range from 0.9 to 0.95.

Containing carbon dioxide carbon-containing gas 9, which is obtained in the combustion stage and which is used in the heating stage, may contain, in vol.%

СО ₂ : from 25 to 35%,

N ₂ : from 50 to 65%,

H ₂ O: from 3 to 8% H ₂ O,

O ₂ : less than 1%,

H ₂ : less than 1%, and CO: less than 2%.

The heating step preferably includes heating said feed mixture 1 by supplying said carbon dioxide-containing carbon-containing gas 9 obtained in the combustion step to a pre-treatment hopper 8. In such a case, the heating step preferably includes supplying said carbon dioxide-containing carbon gas 9 obtained in the combustion step from below to the pre-treatment hopper 8, so that the carbon-containing gas-containing gas 9 flows in a direction opposite to the direction of motion of the feed mixture in the pre-treatment hopper 8 , that is, from bottom to top.

This method may, as shown in FIG. 2, include the first stage of cleaning in a scrubber containing carbon monoxide gas 6, released from the electric arc furnace 5 with a closed arc. This occurs before burning carbon monoxide gas 6 in burner 7.

This method may, as shown in FIG. 2, include a second exhaust stage for discharging the carbon dioxide-containing gas 9 from the pre-treatment hopper 8 and for supplying the carbon-containing gas containing carbon dioxide 9 discharged from the pre-treatment hopper 8 to the burner 7 and / or to the carbon-containing gas containing carbon dioxide 9, formed in the combustion step by means of the burner 7, for controlling the temperature of the carbon dioxide-containing carbon-containing gas 9 obtained in the combustion step. In this case, this method may include a second stage of cleaning in a scrubber for cleaning in a second scrubber 11 containing carbon dioxide carbon-containing gas 9 discharged in the second stage of discharge from the pre-treatment hopper 8.

The reducing agent 3 of the initial mixture 1 may contain a carbon-containing material, for example metallurgical coke, anthracite or charcoal.

Fluxing additive 4 of the initial mixture may contain, for example, calcite, lump calcined lime, quartz, dolomite.

The chemical analysis of agglomerate 2 of manganese ore depends on the chemical analysis of manganese ore. Manganese ores can be based on calcium, based on carbonates and based on oxide compounds, and their chemical analysis can vary significantly. Possible composition of sinter

- 2 033946 merate 2 of manganese ore is:

MP: from 40 to 55%,

Fe: from 1 to 10%,

SiO ₂ : from 4 to 10%,

MgO: from 0.4 to 8%,

CaO: from 1.0 to 15%, (A1 ₂ Oz): from 1 to 15%,

K ₂ O: less than 1.5%,

BaO: less than 0.6%.

Next, a device for preheating and smelting manganese ore agglomerate and some preferred embodiments and variations of this method will be described in more detail.

The device includes an electric arc furnace 5 with a closed arc for melting the initial mixture 1, including at least agglomerate 2 of manganese ore, a reducing agent 3 and a fluxing additive 4. When melting in an electric arc furnace 5 with a closed arc, a layer containing a liquid manganese alloy is formed, and a slag containing layer located above the layer containing a liquid manganese alloy.

The device includes a first feeding device 12, designed to supply the specified source mixture 1 in an electric arc furnace 5 with a closed arc.

The device includes selection means 13 for selecting liquid manganese and slag from an electric arc furnace 5 with a closed arc, individually or simultaneously.

The device includes first release means 14 for releasing carbon monoxide-containing carbon gas 6 from an electric arc furnace 5 with a closed arc.

The device includes a burner 7 for burning carbon monoxide-containing carbon gas 6 obtained from the first exhaust means 14 in the presence of oxygen, such as air, to form carbon dioxide-containing carbon gas 9.

The first feed device 12 of this device includes a pre-treatment hopper 8 for heating said feed mixture 1 with said carbon dioxide-containing carbon gas 9 obtained by means of a burner 7, before feeding said feed mixture 1 into an electric arc furnace 5 with a closed arc.

The electric arc furnace 5 with a closed arc in this device is preferably an alternating current (AC) electric arc furnace 5 with a closed arc.

The burner 7 is preferably connected to the pre-treatment hopper 8, and the pre-treatment hopper 8 is preferably connected to the arc furnace 5 with a closed arc to prevent the burner 7, pre-treatment hopper 8 and the electric arc furnace 5 from being closed by an arc of gases from the environment, for example oxygen, to prevent the occurrence of uncontrolled reactions of the specified source material 1.

Manganese ore agglomerate 2 may have a particle size of 6 to 75 mm.

The pre-processing hopper 8 of this device can be designed to heat the starting mixture 1 to a temperature in the range from 400 to 700 ° C, preferably to a temperature in the range from 500 to 650 ° C.

This device preferably includes, but not necessarily, temperature control means (not shown in the drawings) made to control the temperature of said carbon dioxide-containing carbon-containing gas 9 before feeding said carbon-containing carbon-containing gas 9 to a pre-treatment hopper 8. The temperature of the supplied carbon dioxide-containing carbon gas 9, which is sent to the pre-treatment hopper 8, can be controlled in the range from 600 to 900 ° C.

In the burner 7, carbon monoxide-containing carbon gas 6 obtained from an electric arc furnace 5 with a closed arc is preferably burned with an air ratio of less than 1, for example from 0.9 to 0.95. The oxygen content (O ₂ ) in the carbon dioxide-containing carbon gas 9 obtained in the combustion step must be very low in order to minimize the oxidation of carbon in the starting mixture 1. The content of carbon monoxide (CO) and hydrogen (H ₂ ) in the dioxide-containing carbon carbon-containing gas 9 obtained in the combustion stage must be very low in order to avoid explosions in the gas lines or in the pre-treatment hopper 8.

Burner 7 may be a burner operating on CO, butane, and liquefied petroleum gas.

The specified carbon dioxide-containing carbon gas 9 obtained in the burner 7 contains preferably, but not necessarily, the following substances, in vol.%:

- 3 033946

СО ₂ : from 25 to 35%,

N ₂ : from 50 to 65%,

H ₂ O: from 5 to 15% H ₂ O,

O ₂ : less than 1%,

H ₂ : less than 1%, and CO: less than 2%.

The device, preferably the burner 7, is preferably configured to feed said carbon dioxide-containing carbon gas 9 into the pre-treatment hopper 8 from below so that said carbon-containing gas-containing carbon gas 9 flows in the pre-treatment hopper 8 through the feed mixture from the bottom up.

The device may, as shown in FIG. 2, include a first scrubber 10 configured to clean the carbon monoxide-containing carbon 6 gas discharged from the electric arc furnace 5 before burning carbon monoxide in the burner 7.

The device as shown in FIG. 2 may include second exhaust means 15 configured to discharge carbon dioxide-containing carbon gas 9 from the pre-treatment hopper 8, and a third feed device (not indicated by a numerical reference) made to supply carbon dioxide-containing carbon gas 9 discharged from the second means 15 exhaust, to the burner 7 and / or to the carbon-containing gas 9 containing carbon dioxide formed by the burner 7, for regulating the temperature of the carbon-containing gas containing carbon dioxide 9 is formed 7 th burner.

Second release means 15 of this device may, as shown in FIG. 2, include a second scrubber 11 configured to clean the carbon dioxide-containing carbon gas 9 discharged from the pre-treatment hopper 8. Cold and purified gases removed from the carbon dioxide-containing carbon gas 9 in the second scrubber 11 can be used in temperature control means that are possibly present to control the temperature of the carbon dioxide-containing carbon gas 9, which is fed to the pre-treatment hopper 8.

The first feeding device 12 of this device can be configured to supply a reducing agent 3 containing carbon-containing material, for example metallurgical coke, anthracite and / or charcoal.

The first feeding device 12 of this device can be made to supply a fluxing additive 4 containing at least one substance from calcite, lump burnt lime, dolomite and quartz.

The first feeding device 12 of this device can be made to supply agglomerate 2 of manganese ore containing, in wt.%

MP: from 40 to 55%,

Fe: from 1 to 10%,

SiO ₂ : from 4 to 10%,

MgO: 0.4 to 8%, CaO: 1 to 15%, A1 ₂ 0z: from 1 to 15%, K ₂ O: less than 1.5%, and BaO: less than 0.6%.

The first feed device 12 may, as shown in FIG. 2, include a hopper system 16 including a first hopper 17 for manganese ore sinter 2, a second hopper 18 for reducing agent 3, and a third hopper 19 for fluxing agent 4.

Example 1

Metallurgical coke having the composition shown in table. 1, and an agglomerate of calcite manganese ore having the composition shown in the column Source agglomerate table. 2, mixed in the ratio of 80 wt.% Calcite ore and 20 wt.%; and heated in a container to four different temperatures: 500, 600, 700 and 800 ° C. Agglomerate of calcite manganese ore before mixing was crushed and sieved to a particle size of 2.8 to 6.73 mm, and metallurgical coke before mixing was crushed and sieved to a particle size of from 0.595 to 4.76 mm.

The heating was carried out by induction heating and a gas containing carbon dioxide and nitrogen in a ratio of 30% carbon dioxide and 70% was purged into the container to reproduce the actual heating conditions.

In each case, upon heating to 500, 600, 700, and 800 ° C, the agglomerate composition of calcite manganese ore was determined. As can be seen from the columns 500 ° C, 600 ° C, 700 ° C and 800 ° C table. 3, the change in the composition of sinter of calcite manganese ore was only insignificant, which means

- 4 033946 example, that hardly any reduction of oxides occurs.

Table 1. Chemical analysis of metallurgical coke Coke,% Ash residue, mass. % of the mass.

from Leco 84 CF _lx ⁶⁾ 2) caption. 85 S Leco 0.78 Volatiles titer. 1,2 Ash residue titer. 12.7 Fe ICP ^{1 * 3)} 0.61 ⁴⁾ 4.8 SiO ₂ titer. 7.14 ⁴⁾ 56.2 Cao ICP ³⁾ 0.23 ⁴⁾ 1.8 MgO ICP ³⁾ 0.24 ⁴⁾ 1.9 A1 ₂ 0h ICP ³⁾ 3.07 ⁴⁾ 24.2

¹⁾ Leco analyzer at C, S.

²⁾ Determined by titration.

³⁾ ICP (emission spectrometer with induction coupled plasma).

⁴⁾ wt.% From coke.

^{5) The} amount of ash residue in the coke is 12.7 wt.%.

⁶⁾ Cf _lx value: 100% - (volatiles + ash residue + sulfur).

Table 2. Chemical analysis of preheated calcite ore agglomerates depending on preheating temperature

Component Source agglomerate 500 ° C 600 ° C 700 ° C 800 ° C Μη 43.7 43.9 44.5 44.5 4.42 FROM 0,07 0.05 0.05 0.04 0.04 Fe 5.2 5.2 5.1 5.2 5,0 SiO ₂ 8.2 8.0 7.5 7.6 7.8 MgO 4,5 4.7 4.8 4.7 4,5 Cao 15,2 15,2 14.7 14.6 15.0 AO3 0.71 0.72 0.68 0.71 0.68 K ₂ O 0.02 0.01 0.02 0.02 0.01 Bao 0.24 0.24 0.24 0.23 0.24 TiO ₂ 0.04 0.04 0.04 0,03 0,03 P2O5 <0.03 <0.03 <0.03 <0.03 <0.03 Coo 0.01 0.01 0.01 0.01 0.01 Cr ₂ O ₃ 0,03 0,03 0,03 0,03 0,03 CuO <0.01 <0.01 <0.01 <0.01 <0.01 Nio <0.01 <0.01 <0.01 <0.01 <0.01 Zno 0.01 0.01 0.01 0.01 0.01 Fe ^υ 0.44 0.39 0.36 0.39 0.37

¹⁾ Quantity for metal.

Example 2

Metallurgical coke having the composition shown in table. 1, and an agglomerate of oxide manganese ore having the composition shown in the column Initial agglomerate in table. 3, mixed in the ratio of 80 wt.% Calcite ore and 20 wt.% Charcoal and heated in a container to four different temperatures: 500, 600, 700 and 800 ° C. The agglomerate of manganese oxide ore was crushed and sieved to a particle size of 2.38 to 6.73 mm before mixing, and metallurgical coke was crushed and sieved to a particle size of 0.595 to 4.76 mm before mixing.

The heating was carried out by induction heating, and a gas containing carbon dioxide and nitrogen in a ratio of 30% carbon dioxide and 70% was purged through the container to reproduce the actual heating conditions.

In each case, when heated to 500, 600, 700, and 800 ° C, the agglomerate composition of manganese oxide ore was determined. As can be seen from the columns 500 ° C, 600 ° C, 700 ° C and 800 ° C table. 3, the change in the composition of the agglomerate of oxide manganese ore was only insignificant, which means, for example, that there is hardly any reduction of oxides.

- 5,033,946

Table 3. Chemical analysis of preheated oxide ore agglomerates depending on preheating temperature

Compo nent Source agglomerate 500 ° C 600 ° C 700 ° C 800 ° C Mp 59.0 60.8 58.9 59.8 59.7 FROM 0,03 0,03 0,03 0.15 0.04 Fe 2.7 2.6 3,1 2.7 3.0 SiO ₂ 3.4 3.4 3.3 3.4 3,1 MgO 0.28 0.24 0.41 0.26 0.39 Cao 0.62 0.66 0.53 0.58 0.66 AO3 6.0 5.9 5.8 5.9 5.7 to ₂ o 0.87 0.97 0.83 0.90 0.84 Bao 0.28 0.28 0.29 0.27 0.30 TiO ₂ 0.17 0.17 0.16 0.17 0.16 p ₂ o ₅ 0.18 0.21 0.20 0.20 0.16 Coo 0.17 0.18 0.18 0.18 0.17 Cr ₂ O ₃ 0.32 0.22 ι, θ 0.28 0.86 CuO 0.06 0.06 0.06 0.06 0.06 Nio 0.04 0.04 0.04 0.04 0.04 Zno 0.06 0.06 0.06 0.06 0.06 Fe 0.57 0.53 0.37 0.35 0.42

1) Quantity for metal.

Example 3

To the device shown in FIG. 2, served agglomerate of manganese ore, the composition of which is given in table. 4, with a loading speed of 131 kg / h; and a reducing agent, the composition of which is given in the column of charcoal table. 5, was fed into the pre-treatment hopper 8 with a loading speed of 24 kg / h. A carbon-containing gas containing 57 vol.% N2, 30 vol.% CO ₂ and 11 vol.% H ₂ O and having a temperature of 850 ° C was fed into the pre-treatment hopper 8 with a loading speed of 970 m ³ / h.

Table 4. Chemical analysis of manganese agglomerate, wt.%

Component Analysis,% of the mass. Μη 50,2 F e total 6.6 Fe ²⁺ <0.05 Fe _met . <0.1 SiO ₂ 6.7 Cao 1,0 MgO 0.43 a ₂ o ₃ 13,2 TO 1,2 Ba 0.43 C-total (vol.) 0,03 H ₂ O 0.26

Table 5. Chemical analysis of reducing agents in examples 3 and. 4, wt.%

Component Charcoal Coke With total 75 Cfix 72 85.0 Volatile 26 s oh Ash ash. 2,3 10,2 S 0.01 0.65 Charcoal Volatility Analysis n ₂ 24.6 about ₂ 0.1 n ₂ 0.5 with 36.9 from ₂ 16.5 sun ₄ 21,4 n ₂ about 8.0

- 6,033,946

The carbon components of charcoal begin to gasify at 450 ° C.

It was noted that a mixture in which charcoal is used as the reducing agent 3 can be preheated to a temperature of 400 ° C. without carbon gasification. Charcoal begins to oxidize either by the Boudoir reaction, or by the reaction of the formation of water gas. In addition, in order to avoid carbon oxidation, the oxygen and water content of the carbon dioxide-containing carbon gas 9 must be low.

Example 4

In the device of FIG. 2, a manganese agglomerate, the composition of which is shown in Table 1, was fed into the pre-treatment hopper 8. 4, with a loading speed of 131 kg / h; and a reducing agent, the composition of which is shown in the coke column in table. 5, with a loading speed of 24 kg / h. A carbon-containing gas containing 57 vol.% N2, 30 vol.% CO ₂ and 11 vol.% H ₂ O and having a temperature of 850 ° C was fed into the pre-treatment hopper 8 with a loading speed of 970 m ³ / h.

The carbon in coke begins to gasify at 700 ° C.

It has been observed that a mixture in which coke is used as reducing agent 3 can be preheated to a temperature of 650 ° C; in this case, the carbon in the coke does not begin to oxidize, neither by the Boudoir reaction, nor by the reaction of formation of water gas. In addition, in order to avoid carbon oxidation, the oxygen and water content of the carbon dioxide-containing carbon gas 9 must be low.

It will be apparent to one skilled in the art that as the technology develops, the basic idea of this invention can be implemented in various ways. Thus, the present invention and examples of its embodiment are not limited to the above examples, but they may vary within the scope of the claims.

Claims (12)

CLAIM 1. A method of preheating and smelting manganese ore agglomerate, comprising the step of supplying an initial mixture (1) containing at least manganese ore agglomerate (2), a reducing agent (3) and a fluxing additive (4) to an electric arc furnace (5 ) with a closed arc; a melting step of the initial mixture (1) in an electric arc furnace (5) with a closed arc to form a layer containing a liquid manganese alloy and a layer containing slag and located above the layer containing a liquid manganese alloy; the stage of selection of liquid manganese and slag from the electric arc furnace (5) with a closed arc; the first stage of release for the release containing carbon monoxide carbon-containing gas (6) from an electric arc furnace (5) with a closed arc; a step of burning carbon monoxide-containing carbon gas (6) discharged from the electric arc furnace (5) with a closed arc in the first exhaust stage, in the presence of oxygen, for example air, in the burner (7) to form carbon dioxide-containing carbon dioxide (9); a step of heating said initial mixture (1) in a pre-treatment hopper (8) to a temperature in the range from 400 to 700 ° C before feeding said initial mixture (1) into an electric arc furnace (5) with a closed arc using said carbon-containing gas containing carbon dioxide (9) ) formed at the combustion stage; a second exhaust stage for discharging carbon dioxide-containing carbon gas (9) from a pre-treatment hopper (8), where carbon dioxide-containing carbon gas (9) discharged in the second exhaust stage is fed to a burner (7) and / or to carbon dioxide carbon-containing gas (9), which is used in the heating step, to control the temperature of the carbon dioxide-containing carbon gas (9) formed in the combustion step, and heating the feed mixture (1) in the heating step by supplying said holding carbon dioxide carbon-containing gas (9) into the pre-treatment hopper (8). 2. The method according to claim 1, where the electric arc furnace (5) with a closed arc is an alternating current (AC) electric arc furnace (5) with a closed arc. 3. The method according to claim 1 or 2, where the agglomerate (2) of manganese ore has a particle size of from 6 to 75 mm 4. The method according to any one of claims 1 to 3, where in the heating stage, the initial mixture (1) is heated in the pre-treatment hopper (8) to a temperature in the range from 500 to 650 ° C. 5. The method according to any one of claims 1 to 4, where the temperature of the specified carbon dioxide-containing carbon-containing gas (9), which is used in the heating step, is controlled to a temperature in the range from 580 to 900 ° C. 6. The method according to any one of claims 1 to 5, where the specified carbon dioxide-containing carbon-containing gas (9), which is used in the heating stage, contains in vol.%: СО ₂ - from 25 to 35%, N2 - from 50 to 65%, H ₂ O - from 3 to 8%, - 7 033946 O ₂ - less than 1%, H ₂ - less than 1% and CO - less than 2%. 7. The method according to any one of claims 1 to 6, wherein, in the heating step, said carbon-containing gas (9) containing carbon dioxide is supplied to the pre-treatment hopper (8) from below, so that said carbon-containing gas (9) containing carbon dioxide flows through the initial mixture (1) in the pre-treatment hopper (8) from the bottom up. 8. The method according to any one of claims 1 to 7, wherein the carbon-containing gas containing carbon monoxide (6), released in the first stage of discharge from the electric arc furnace (5) with a closed arc, is cleaned in the first scrubber (10) before the carbon-containing carbon monoxide-containing gas (6) discharged in the first stage of release to the burner (7). 9. The method according to any one of claims 1 to 8, wherein the carbon dioxide-containing carbon gas (9) discharged in the second exhaust stage is cleaned in a second scrubber (11) before the carbon dioxide-containing carbon gas (9) discharged in the second stage is supplied exhaust burner (7). 10. The method according to any one of claims 1 to 9, where the reducing agent (3) contains carbonaceous material, for example coke, anthracite and / or charcoal. 11. The method according to any one of claims 1 to 10, where the fluxing additive (4) contains at least one substance from calcite, lump burnt lime, dolomite and quartz. 12. The method according to any one of claims 1 to 11, where the agglomerate (2) of manganese ore contains, in wt.%: Mn - from 40 to 55%, Fe - from 1 to 10%, SiO ₂ - from 4 to 10%, MgO - from 0.4 to 8%, CaO - from 1 to 15%, Al ₂ O ₃ - from 1 to 15%, K ₂ O - less than 1.5% and BaO - less than 0.6%.