JP6916658B2 - Manganese recovery method - Google Patents

Description

The present invention relates to a method for recovering manganese, which recovers manganese from a dry battery as a steel alloy component.

Hundreds of millions of manganese dry batteries, which are disposable primary batteries, are used annually in Japan, but since they are disposable, they are discarded after use. Used manganese batteries are not actively recycled and are effectively landfilled. Carbon and manganese dioxide are used as positive electrode materials, zinc is used as negative electrode material, and zinc chloride and ammonium chloride are used as electrolytic solutions in manganese dry batteries. As described above, the manganese dry battery contains manganese and zinc, which are valuable metal resources, and a stable supply amount can be expected, so that the establishment of recycling technology is expected.

As a technique for recovering manganese from a manganese dry battery, Patent Document 1 describes that the recovered manganese dry battery is crushed and screened to sort out powders and granules, and the powders and granules are dissolved and treated with dilute acid to form a solution residue. A method is disclosed in which a mixture of manganese dioxide and carbon is recovered, and the solution is treated with ozone to oxidize and precipitate manganese ions contained in the solution to further recover manganese.

Japanese Unexamined Patent Publication No. 2015-206077

The techniques disclosed in Patent Document 1 include a step of crushing a used manganese dry cell, a step of sieving and selecting powders and granules, a step of dissolving powders and granules with dilute hydrochloric acid or dilute sulfuric acid, and solidifying a solution. Manganese is recovered by a very complicated method of recovering manganese through a step of liquid separation, a step of further ozone treatment, and a step of solid-liquid separation of the ozone-treated solution. Therefore, it is predicted that the cost required for recovering manganese will be higher than the benefit of recovering manganese, and there is a problem that the recycling of manganese batteries may not be economically established. The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a method for recovering manganese that can recover manganese from a dry battery by a method simpler than that of the prior art.

The features of the present invention for solving such a problem are as follows.
[1] A dry battery and an iron-containing raw material are charged into an electric furnace, the dry battery and the iron-containing raw material are melted to form molten steel, a reducing agent is charged into the molten steel, reduction kneading is performed, and the dry battery is subjected to reduction kneading. A method for recovering manganese, which recovers the contained manganese as a steel alloy component.
[2] The reducing agent is a carbon-based reducing agent and / or an aluminum-based reducing agent.
The method for recovering manganese according to [1], wherein the amount of carbon charged in the carbon-based reducing agent and the amount of aluminum charged in the aluminum-based reducing agent are determined so as to satisfy the following formula (1).
Y + Z ≧ 0.11X + 8.01 ... (1)
However, in the formula (1), X is the charge amount (kg / t) of the dry battery per 1 ton of molten steel, and Y is the charge amount of carbon in the carbon-based reducing agent per 1 ton of molten steel (kg / t). Yes, Z is the amount of aluminum charged (kg / t) in the aluminum-based reducing agent per 1 ton of molten steel.
[3] The method for recovering manganese according to [1] or [2], which uses hot metal produced in a blast furnace as the reducing agent.
[4] The method for recovering manganese according to any one of [1] to [3], wherein the oxygen concentration of the molten steel is 700 ppm or less.

In the method for recovering manganese of the present invention, a dry cell is charged into an electric furnace together with an iron-containing raw material such as scrap, and reduction smelting is carried out using the electric furnace to recover manganese contained in the dry cell as a steel alloy component. .. As described above, by implementing the manganese recovery method of the present invention, manganese can be recovered from the dry battery by a simpler method than the conventional method, so that the cost of recovering manganese from the dry battery is reduced, and the dry battery is recycled by recovering manganese. Can be promoted economically.

It is sectional drawing which shows an example of the electric furnace which can carry out the manganese recovery method which concerns on this embodiment. It is a graph which showed the relationship between the charge amount of a dry cell, and the manganese concentration of molten steel. It is a graph which showed the relationship between the charge amount of a dry cell, and the charge amount of carbon in a carbon-based reducing agent. It is a graph which showed the relationship between the charge amount of a dry cell, and the charge amount of aluminum in an aluminum-based reducing agent. It is a graph which shows the relationship between the oxygen concentration of molten steel and the manganese concentration of molten steel.

Hereinafter, the present invention will be described through embodiments of the invention. FIG. 1 is a schematic cross-sectional view showing an example of an electric furnace in which the manganese recovery method according to the present embodiment can be implemented. The electric furnace 10 includes a furnace body 12, a furnace lid 14, an arc electrode 16, a burner 18, an oxygen lance 20, and an injection lance 21.

The method for recovering manganese according to the present embodiment is carried out by reducing and kneading manganese dioxide using an electric furnace 10. In the reduction kneading of manganese dioxide using the electric furnace 10, first, an iron-containing raw material containing scrap, waste, dust and the like, a dry battery, a slag-making agent containing fresh lime and the like, and coke breeze which is a reducing agent are used. As the first charging, the furnace body 12 is charged with the furnace lid 14 removed. After these raw materials are charged, the furnace lid 14 is attached to the furnace body 12. These raw materials are dissolved by the arc plasma formed by the arc electrode 16 and the cutting from the side surface of the iron-containing raw material using the burner 18.

After most of the iron-containing raw material is melted and the bulk of the iron-containing raw material in the furnace body 12 becomes low, the furnace lid 14 is removed and the iron-containing raw material is charged into the furnace body 12 as the second charge. The iron-containing raw material is dissolved by the arc electrode 16 and the burner 18 as in the first charge. FIG. 1 shows a state in which the iron-containing raw material, the dry battery, the slag-forming agent, and the coke breeze are melted, and the molten slag 24 is formed on the surface of the molten steel 22 in the furnace body 12.

Further, oxygen-containing gas is blown from the oxygen lance 20, and powdered coke is blown from the injection lance 21. Oxygen contained in the oxygen-containing gas blown from the oxygen lance 20 reacts with the powdered coke blown from the injection lance 21 to generate carbon monoxide, and the molten slag 24 is formed by the carbon monoxide. Further, since the reaction between oxygen and powdered coke is an exothermic reaction, by forming the molten slag 24 with the carbon monoxide, the reaction heat is applied to the molten slag 24 and the temperature of the molten slag 24 is raised. be able to. The heat of reaction applied to the molten slag 24 is further transferred to the molten steel 22, which raises the temperature of the molten steel 22.

In the reduction kneading, the arc electrode 16 is continuously energized, oxygen-containing gas is blown from the oxygen lance 20, and coke breeze is blown from the injection lance 21, and the temperature of the molten steel 22 is controlled to be about 1600 to 1660 ° C. Is carried out. On condition that the temperature of the molten steel 22 and the carbon concentration of the molten steel 22 have reached the predetermined temperature and carbon concentration for each steel type, the oxygen-containing gas is sprayed from the oxygen lance 20 and the coke breeze from the injection lance 21. And the energization to the arc electrode 16 is stopped to end the reduction kneading. After that, molten steel 22 containing manganese as a steel alloy component is discharged from the furnace body 12 to a ladle (not shown).

The capacity of the furnace body 12 used in this embodiment is, for example, 140 tons. 130 to 140 tons of iron-containing raw material is charged into the furnace body 12 in two portions. The amount of dry batteries charged varies depending on the arrival status, but the amount of dry batteries in the range of 9 kg / t or more and 41 kg / t or less is charged together with the first charge of the iron-containing raw material. The dry batteries may be all charged together with the first charge of the iron-containing raw material, and may be divided and charged together with the first charge of the iron-containing raw material and the second charge of the iron-containing raw material. You may. Further, in the present embodiment, the unit "kg / t" means the charged mass (kg) per 1 ton of molten steel.

The dry battery used in the method for recovering manganese according to the present embodiment is a dry battery in which manganese dioxide is used as a positive electrode material. The dry battery in which manganese dioxide is used as the positive electrode material is, for example, a manganese dry battery or an alkaline dry battery. Further, the dry battery used in the manganese recovery method according to the present embodiment is a used dry battery that has been used and recovered, but the present invention is not limited to this, and even an unused dry battery is related to the present embodiment. It can be used as a method for recovering manganese.

The dry battery contains carbon and manganese dioxide as a positive electrode material, zinc as a negative electrode material, zinc chloride as an electrolytic solution, and iron and iron oxide (rust) as an exterior. By reduction kneading using the electric furnace 10, manganese dioxide as a positive electrode material is reduced to manganese. Manganese is dissolved in molten steel 22 and recovered as a steel alloy component. In addition, iron oxide on the exterior is also reduced and recovered as iron. Zinc as the negative electrode material and zinc chloride in the electrolytic solution evaporate during reduction kneading and are collected as dust collection dust.

FIG. 2 is a graph showing the relationship between the charge amount of the dry battery and the manganese concentration of the molten steel. In FIG. 2, the horizontal axis represents the charge amount (t / ch) of the dry battery, and the vertical axis represents the manganese concentration (mass%) of the molten steel. The plot of FIG. 2 shows the actual value of the charge amount of the dry battery and the manganese concentration of the molten steel discharged in the reduction kneading performed using the electric furnace 10, and the solid line of FIG. 2 is the plot showing the actual value. It is an approximate expression calculated from. In addition, in this embodiment, the unit "t / ch" means the charge mass (t) per one charge of electric furnace refining.

Since manganese is also contained in the scrap charged into the electric furnace 10, as shown in FIG. 2, the molten steel 22 contains manganese even in an operation in which no dry battery is charged. However, as shown by the approximate formula of FIG. 2, since the manganese concentration of the molten steel increases as the charge amount of the dry battery increases, the dry battery is charged into the electric furnace and the reduction smelting is carried out. Therefore, it can be seen that manganese contained in the dry battery can be recovered as a steel alloy component.

As described above, in the method for recovering manganese according to the present embodiment, a dry battery is charged into the furnace body 12 of the electric furnace 10 together with the iron-containing raw material, and manganese is produced from the dry battery by carrying out reduction kneading using the electric furnace 10. Can be recovered as a steel alloy component. As described above, the manganese recovery method according to the present embodiment can recover manganese from the dry battery by a simpler method than the conventional method, so that the cost of recovering manganese from the dry battery is reduced and the dry battery can be recycled economically. Can be promoted.

Next, the amount of the reducing agent charged will be described. In the method for recovering manganese according to the present embodiment, coke breeze and coke powder, which are carbon-based reducing agents, are used as the reducing agent. The coke mass used in this embodiment is, for example, coke that is sieved on a sieve with a sieve having an opening diameter of 35 mm. Further, the powdered coke is, for example, coke that is sieved under a sieve with a sieve having an opening diameter of 1 mm. FIG. 3 is a graph showing the relationship between the charge amount of the dry battery and the charge amount of carbon in the carbon-based reducing agent. In FIG. 3, the horizontal axis represents the charge amount of the dry battery (kg / t), and the vertical axis represents the charge amount of carbon in the carbon-based reducing agent (kg / t).

The circle plot in FIG. 3 shows the actual values of the charge amount of the dry battery and the charge amount of carbon in the carbon-based reducing agent in the reduction kneading carried out using the electric furnace 10. The amount of carbon charged in the carbon-based reducing agent was calculated from the amount charged of coke breeze and coke breeze, assuming that 90% by mass of coke breeze and coke breeze was carbon. The solid line in FIG. 3 is a profile showing the relationship between the charge amount of the dry battery and the lower limit value of the charge amount of carbon in the past results of reduction kneading. This profile can be expressed by the following equation (2). The amount of carbon charged in the reduction kneading shown in FIG. 3 is exclusively the amount of carbon charged so as to improve the iron yield in the reduction kneading of the iron-containing raw material.

Y = 0.10X + 8.00 ... (2)

In the above equation (2), X is the charge amount of the dry battery (kg / t), and Y is the charge amount of carbon in the carbon-based reducing agent (kg / t). The above equation (2) is the lower limit of the carbon content calculated to improve the iron yield in the reduction kneading of the iron-containing raw material. Therefore, if the lower limit is exceeded, the iron yield decreases. At the same time, the amount of manganese recovered also decreases. Therefore, when a carbon-based reducing agent is used, it is preferable to determine the amount of carbon charged so as to satisfy the following equation (3).

Y ≧ 0.10X + 8.00 ... (3)

By determining the amount of carbon charged so as to satisfy the above equation (3), the yield of iron can be improved, manganese dioxide in the dry battery can be reduced, and manganese can be recovered as a steel alloy component. On the other hand, when the amount of carbon charged does not satisfy the above equation (3), the yield of iron is lowered, and manganese dioxide contained in the dry battery cannot be sufficiently reduced and is recovered as a steel alloy component. It is not preferable because it reduces manganese.

The reducing agent is not limited to the carbon-based reducing agent, and an aluminum-based reducing agent may be used. FIG. 4 is a graph showing the relationship between the charge amount of the dry battery and the charge amount of aluminum in the aluminum-based reducing agent. In FIG. 4, the horizontal axis is the charge amount of the dry battery (kg / t), and the vertical axis is the charge amount of aluminum in the aluminum-based reducing agent (kg / t). As the aluminum-based reducing agent, aluminum ash can be used.

The triangular plot in FIG. 4 shows the actual values of the charge amount of the dry battery and the charge amount of aluminum in the aluminum-based reducing agent in the reduction kneading carried out using the electric furnace 10. The amount of aluminum charged in the aluminum-based reducing agent was calculated from the amount of aluminum ash charged, assuming that 10% by mass of the aluminum ash used as the aluminum-based reducing agent was aluminum. The solid line in FIG. 4 is a profile showing the relationship between the charge amount of the dry battery and the lower limit value of the charge amount of aluminum in the past results of reduction kneading. This profile can be expressed by the following equation (4). The amount of aluminum charged in the reduction kneading shown in FIG. 4 is exclusively the amount of aluminum charged so as to improve the yield of iron in the reduction kneading of the iron-containing raw material.

Z = 0.006X + 0.010 ... (4)

In the above equation (4), X is the charge amount (kg / t) of the dry battery, and Z is the charge amount (kg / t) of aluminum in the aluminum-based reducing agent. The above equation (4) is the lower limit of the amount of aluminum calculated to improve the yield of iron in the reduction kneading of the iron-containing raw material. Therefore, if the amount falls below the lower limit, the yield of iron decreases. At the same time, the amount of manganese recovered also decreases. Therefore, when an aluminum-based reducing agent is used, it is preferable to determine the amount of aluminum charged so as to satisfy the following equation (5).

Z ≧ 0.006X + 0.010 ... (5)

By determining the amount of aluminum charged so as to satisfy the above equation (5), the yield of iron can be improved, manganese dioxide contained in the dry battery can be reduced, and manganese can be recovered as a steel alloy component. On the other hand, when the amount of aluminum charged does not satisfy the above equation (5), the yield of iron is lowered, and manganese dioxide contained in the dry battery cannot be sufficiently reduced and is recovered as a steel alloy component. It is not preferable because manganese is reduced.

Further, as the reducing agent, a carbon-based reducing agent and an aluminum-based reducing agent may be used in combination. When the carbon-based reducing agent and the aluminum-based reducing agent are used in combination, the following formula (6) can be derived by adding the formula (2) to the formula (4).

Y + Z = 0.11X + 8.01 ... (6)

The above equation (6) is a mathematical formula indicating the lower limit of the amount of the reducing agent charged when the carbon-based reducing agent and the aluminum-based reducing agent are used in combination. Therefore, when the carbon-based reducing agent and the aluminum-based reducing agent are used in combination, the charge amount of carbon in the carbon-based reducing agent and aluminum in the aluminum-based reducing agent should be determined so as to satisfy the following equation (1). Is preferable.

Y + Z ≧ 0.11X + 8.01 ... (1)

By determining the charge amounts of carbon and aluminum so as to satisfy the above equation (1), the yield of iron can be improved, manganese dioxide in the dry battery can be reduced, and manganese can be recovered as a steel alloy component. On the other hand, when the charge amount of carbon and aluminum does not satisfy the above equation (1), the yield of iron is lowered and manganese dioxide contained in the dry battery cannot be sufficiently reduced, and the manganese dioxide is recovered as a steel alloy component. It is not preferable because less manganese is produced.

Further, in the manganese recovery method according to the present embodiment, it is preferable to control the oxygen concentration of the molten steel 22 during reduction kneading to 700 ppm or less. FIG. 5 is a graph showing the relationship between the oxygen concentration of the molten steel and the manganese concentration of the molten steel. In FIG. 5, the horizontal axis is the oxygen concentration (ppm) of the molten steel, and the vertical axis is the manganese concentration (1/100 mass%) of the molten steel. The white circle plots in the figure are the actual values of the oxygen concentration of the molten steel 22 and the manganese concentration of the molten steel in the reduction kneading performed using the electric furnace 10, and the black circle plots are calculated based on the actual values. It is a plot on the approximate expression.

It is known that the carbon concentration of the molten steel 22 is inversely proportional to the oxygen concentration of the molten steel 22. Applying this relationship to the manganese concentration of the molten steel 22, the manganese concentration of the molten steel 22 is B (1/100 mass%), and the oxygen concentration of the molten steel 22 is A (ppm). It was created. Then, the values of C and D were calculated so that the equation (6) fits into the actual value of the reduction kneading carried out using the electric furnace 10. In the present embodiment, C in the equation (6) is "8000" and D is "-5".

B = C / A + D ... (6)

As shown in FIG. 5, when the oxygen concentration of the molten steel 22 in the reduction kneading is lowered, the manganese concentration of the molten steel 22 is increased. In particular, it can be seen that the amount of increase in the manganese concentration of the molten steel 22 increases by lowering the oxygen concentration of the molten steel 22 at around 700 ppm of the oxygen concentration of the molten steel 22. From these results, it can be seen that the amount of manganese that can be recovered as a steel alloy component can be increased by controlling the oxygen concentration of the molten steel 22 to 700 ppm or less.

The oxygen concentration of the molten steel 22 can be controlled by adjusting the amount of oxygen blown from the oxygen lance 20 and the amount of powdered coke blown from the injection lance 21. Specifically, if the amount of oxygen sprayed is reduced, the oxygen concentration of the molten steel 22 is reduced, and if the amount of oxygen sprayed is increased, the oxygen concentration of the molten steel 22 is increased. Further, if the amount of coke breeze blown is reduced, the oxygen concentration of the molten steel 22 is increased, and if the amount of coke breeze blown is increased, the oxygen concentration of the molten steel 22 is lowered. Then, the respective target values are set from the amount of oxygen blown from the oxygen lance and the amount of powdered coke blown from the injection lance 21 in the operation results in which the oxygen concentration of the molten steel 22 is 700 ppm or less, and the target values are set. By adjusting the amount of oxygen blown from the oxygen lance and the amount of coke powder blown from the injection lance 21, the oxygen concentration of the molten steel 22 can be controlled to 700 ppm or less.

In this embodiment, an example in which coke breeze, coke powder, and aluminum ash are used as the reducing agent is shown, but the present invention is not limited to this. As the reducing agent, hot metal produced in a blast furnace may be used. Since the hot metal produced in the blast furnace contains about 4.3% by mass of carbon, manganese dioxide can be efficiently reduced by the carbon, and the amount of manganese that can be recovered as a steel alloy component can be increased.

Next, an example of the method for recovering manganese according to the present invention will be described. Reduction smelting was carried out using an electric furnace 10 having an electric furnace capacity of 140 tons and a transformer capacity of 100 MVA. Table 1 shows the operating conditions of reduction smelting and the composition of molten steel and slag after the reduction smelting. Further, as the slag-making agent, three kinds of slag-making agents (slag-making agent A, slag-making agent B, and slag-making agent C) were used. The amount (t / ch) of these slag-making agents charged is shown in Table 2, and the compositions of the slag-making agent A, the slag-making agent B, and the slag-making agent C are shown in Table 3.

In Example 1, 90.0 tons of scrap was charged into the electric furnace 10 in the first charge and 50.3 tons in the second charge. The dry cell, aluminum ash, coke breeze and slag-forming agent were charged into the electric furnace 10 together with the scrap at the first charging. After the charged scrap was melted, oxygen gas was blown from the oxygen lance 20 and powdered coke was blown from the injection lance 21 to carry out reduction smelting. After the carbon concentration of the molten steel is in the range of 0.08 to 0.15 (mass%) and the temperature of the molten steel is in the range of 1590 to 1650 ° C., the oxygen gas is blown from the oxygen lance 20 and the injection lance 21 is used. The blowing of coke breeze from the surface was stopped, and the energization of the arc electrode 16 was stopped to complete the reduction kneading.

Since the type of scrap differs from operation to operation and the amount of manganese contained in the scrap is not constant, it is not possible to calculate the exact amount of manganese contained in the dry battery, but a certain amount of manganese is recovered from the dry battery. What was done can be read from FIG. 2 and Table 1. Moreover, when the oxygen concentration of the molten steel in Example 1 was calculated using the equation (6), it was 347 ppm. As described above, the oxygen concentration of the molten steel of Example 1 was much lower than 700 ppm, and it is considered from FIG. 5 that a large amount of manganese could be recovered from the dry battery.

In Example 2, 90.0 tons of scrap was charged into the electric furnace 10 in the first charge and 45.0 tons in the second charge. The dry cell, aluminum ash, coke breeze and slag-forming agent were charged into the electric furnace 10 together with the scrap at the first charging. After the charged scrap was melted, oxygen gas was blown from the oxygen lance 20 to carry out reduction smelting. After the carbon concentration of the molten steel is in the range of 0.08 to 0.15 (mass%) and the temperature of the molten steel is in the range of 1590 to 1650 ° C., the blowing of oxygen gas from the oxygen lance 20 is stopped and the injection of oxygen gas is stopped. The energization of the arc electrode 16 was stopped to complete the reduction kneading.

In Example 2, the type of scrap differs depending on the operation, and the amount of manganese contained in the scrap is not constant. Therefore, it is not possible to calculate the exact amount of manganese contained in the dry battery, but a certain amount. It can be read from FIG. 2 and Table 1 that manganese could be recovered from the dry battery. Moreover, when the oxygen concentration of the molten steel in Example 2 was calculated using the equation (6), it was 400 ppm. As described above, the oxygen concentration of the molten steel of Example 2 was much lower than 700 ppm, and it is considered from FIG. 5 that a large amount of manganese could be recovered from the dry battery.

In Example 3, 90.0 tons of scrap was charged into the electric furnace 10 in the first charge and 48.5 tons in the second charge. The dry cell, aluminum ash, coke breeze and slag-forming agent were charged into the electric furnace 10 together with the scrap at the first charging. After the charged scrap was melted, oxygen gas was blown from the oxygen lance 20 and powdered coke was blown from the injection lance 21 to carry out reduction smelting. After the carbon concentration of the molten steel is in the range of 0.08 to 0.15 (mass%) and the temperature of the molten steel is in the range of 1590 to 1650 ° C., the oxygen gas is blown from the oxygen lance 20 and the injection lance 21 is used. The blowing of coke breeze from the surface was stopped, and the energization of the arc electrode 16 was stopped to complete the reduction kneading.

In Example 3, the type of scrap differs depending on the operation, and the amount of manganese contained in the scrap is not constant. Therefore, it is not possible to calculate the exact amount of manganese contained in the dry battery, but a certain amount. It can be read from FIG. 2 and Table 1 that manganese could be recovered from the dry battery. Moreover, when the oxygen concentration of the molten steel in Example 2 was calculated using the equation (6), it was 333 ppm. As described above, the oxygen concentration of the molten steel of Example 3 was much lower than 700 ppm, and it is considered from FIG. 5 that a large amount of manganese could be recovered from the dry battery.

10 Electric furnace 12 Reactor body 14 Reactor lid 16 Arc electrode 18 Burner 20 Oxygen lance 21 Injection lance 22 Molten steel 24 Molten slag

Claims (5)

Charge the dry battery and iron-containing raw material into the electric furnace,
The dry battery and the iron-containing raw material are melted to form molten steel.
A method for recovering manganese, wherein a reducing agent is charged into the molten steel, reduction kneading is performed, and manganese contained in the dry battery is recovered as a steel alloy component .
The reducing agent is a carbon-based reducing agent and an aluminum-based reducing agent.
A method for recovering manganese, which determines the amount of carbon charged in the carbon-based reducing agent and the amount of aluminum charged in the aluminum-based reducing agent so as to satisfy the following equation (1).
Y + Z ≧ 0.11X + 8.01 ... (1)
However, in the formula (1), X is the charge amount (kg / t) of the dry battery per 1 ton of molten steel.
Y is the amount of carbon charged (kg / t) in the carbon-based reducing agent per 1 ton of molten steel, and Z is
The amount of aluminum charged (kg / t) in the aluminum-based reducing agent per 1 ton of molten steel.
NS. Charge the dry battery and iron-containing raw material into the electric furnace,
The dry battery and the iron-containing raw material are melted to form molten steel.
A method for recovering manganese, wherein a reducing agent is charged into the molten steel, reduction kneading is performed, and manganese contained in the dry battery is recovered as a steel alloy component.
The reducing agent is a carbon-based reducing agent.
A method for recovering manganese, which determines the amount of a carbon-based reducing agent charged so as to satisfy the following formula (3).
Y ≧ 0.10X + 8.00 ... (3)
However, in the formula (3), X is the charge amount (kg / t) of the dry battery per 1 ton of molten steel, and Y is the charge amount of carbon in the carbon-based reducing agent per 1 ton of molten steel (kg / t). be. Charge the dry battery and iron-containing raw material into the electric furnace,
The dry battery and the iron-containing raw material are melted to form molten steel.
A method for recovering manganese, wherein a reducing agent is charged into the molten steel, reduction kneading is performed, and manganese contained in the dry battery is recovered as a steel alloy component.
The reducing agent is an aluminum-based reducing agent.
A method for recovering manganese, which determines the amount of an aluminum-based reducing agent charged so as to satisfy the following formula (5).
Z ≧ 0.006X + 0.010 ... (5)
However, in the formula (5), X is the charge amount (kg / t) of the dry battery per 1 ton of molten steel, and Z is the charge amount (kg / t) of aluminum in the aluminum-based reducing agent per 1 ton of molten steel. be. The method for recovering manganese according to any one of claims 1 to 3, wherein hot metal produced in a blast furnace is used as the reducing agent. The method for recovering manganese according to any one of claims 1 to 4 , wherein the oxygen concentration of the molten steel is 700 ppm or less.

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