KR20210064926A - REDUCTANT FOR MANUFACTURING Fe-Cr AND METHOD FOR MANUFACTURING Fe-Cr - Google Patents

Abstract

The present invention relates to a reducing agent for manufacturing ferrochrome and a ferrochrome manufacturing method. According to one embodiment of the present invention, the ferrochrome manufacturing method comprises: a step of preparing a reducing agent containing Si and SiC; a step of preparing a raw material containing a chromium mineral and the reducing agent; and a step of smelting the raw material. According to one embodiment of the present invention, the reducing agent for manufacturing the ferrochrome contains the Si and the SiC.

Description

Reducing agent for ferrochrome manufacturing and ferrochrome manufacturing method {REDUCTANT FOR MANUFACTURING Fe-Cr AND METHOD FOR MANUFACTURING Fe-Cr}

The present invention relates to a reducing agent for producing ferrochrome and a method for producing ferrochrome. More specifically, it relates to a method for producing ferrochrome having a low carbon content using a reducing agent for producing ferrochrome including Si and SiC.

Ferrochrome is an iron alloy containing iron and chromium as main components, and is the main raw material for stainless steel. It is used to adjust the chromium content of stainless steel.

Ferrochrome is generally produced by smelting reduction by charging chromium ore, coke/coal, and flux in a submerged arc electric furnace. Chromium minerals generally have a melting point of more than 1800°C, and because they are non-reducing oxides, reduction reactions proceed at high temperatures, requiring approximately 4000 kWh of air paper per ton of ferrochrome.

Chromium minerals for the production of ferrochrome are generated in the form of spectroscopy in 70% of the total production. It is not easy to operate an arc electric furnace when spectroscopy is applied, so it needs to be briquetted again, and additional energy is required in the process of doing this.

In order to reduce the high energy cost in manufacturing ferrochrome, reduction using metals such as aluminum, silicon, and magnesium is attempted instead of coke, but the production of the reduced metal itself requires a lot of energy and the price is high. As a result, it is more economical than coke. no advantage

Carbon content is important in ferrochrome products, and as the carbon content is lower, additional processes can be reduced in the steel manufacturing process, making it a preferred product.

The composition of ferrochrome differs depending on the carbon content and is largely classified into three types. High carbon ferrochrome most commonly contains 4 to 10% by weight of carbon, and medium carbon ferrochrome contains 0.5 to 4.0% by weight. In the case of low-carbon ferrochrome, it contains 0.1 wt% or less. However, in order to lower the carbon content, an additional refining process is required, which causes an increase in product price.

At this time, the cause of the increase in the carbon content occurs because coke or coal is used as a reducing agent.

An object of the present invention is to provide a reducing agent for producing ferrochrome and a method for producing ferrochrome. More specifically, an object of the present invention is to provide a method for producing ferrochrome having a low carbon content using a reducing agent for producing ferrochrome including Si and SiC.

Ferrochrome manufacturing method according to an embodiment of the present invention comprises the steps of preparing a reducing agent containing Si and SiC; A raw material preparation step comprising a chromium mineral and the reducing agent; and smelting raw materials.

In the step of preparing a reducing agent; in, the reducing agent may be one comprising silicon sludge.

The content of SiC in the silicon sludge may be 20 to 80% by weight.

In silicon sludge, [Si]/[SiC] may be 0.25 to 4.0.

Here, [Si] means the weight % of Si, and [SiC] means the weight % of SiC.

The raw material preparation step; may include a chromium mineral, a reducing agent, starch and water glass.

In the step of preparing a raw material comprising a chromium mineral and the reducing agent, the amount of the reducing agent may be determined by measuring the amounts of chromium oxide and iron oxide present in the chromium mineral.

In the step of preparing a raw material comprising a chromium mineral and the reducing agent; in the amount of the reducing agent, the amount of chromium oxide and iron oxide present in the chromium mineral is measured, and the equivalent is calculated and prepared by substituting into the following Equations 1 to 4 it could be

[Formula 1] Cr ₂ O ₃ + 1.5Si = 2Cr + 1.5SiO ₂

[Formula 2] Cr ₂ O ₃ + SiC = 2Cr + SiO ₂ + CO

[Equation 3] Fe ₂ O ₃ + 1.5Si = 2Fe + 1.5SiO ₂

[Equation 4] Fe ₂ O ₃ + SiC = 2Fe + SiO ₂ + CO

The amount of the reducing agent may be prepared by measuring the amounts of chromium oxide and iron oxide present in the chromium mineral, calculating the equivalent by substituting it in Equations 1 to 4, and then preparing 0.8 to 1.2 based on the equivalent weight of 1.

raw material preparation stage; Thereafter, a briquetting step of preparing the raw material as a briquette; may further include.

Refining the raw material; may include a reduction reaction step of reacting the raw material in an arc furnace.

smelting raw materials; Then, a refining step of tapping the reduced metal and adjusting the composition; a casting step of casting the conditioned metal; and crushing the cast metal to commercialize the product.

The reducing agent for producing ferrochrome according to an embodiment of the present invention includes Si and SiC.

The Si and SiC of the reducing agent may be from silicon sludge.

The SiC content of the silicon sludge may be 20 to 80% by weight.

In the ferrochrome manufacturing method according to an embodiment of the present invention, energy can be reduced in manufacturing ferrochrome. That is, power consumption per 1 kg of product can be reduced. This is because an alternative reducing agent capable of reducing energy is used.

In addition, the method for manufacturing ferrochrome according to an embodiment of the present invention may use an existing submerged arc electric operation by mixing an alternative reducing agent and chromium ore.

Ferrochrome manufacturing method according to an embodiment of the present invention, by replacing the reducing agent of ferrochrome with an element other than carbon prevents the inflow of carbon, it is possible to manufacture a ferrochrome product with a low carbon content.

In the method for manufacturing ferrochrome according to an embodiment of the present invention, the ratio of the recovered product to the input is higher than when the conventional carbon reducing agent is used.

In the ferrochrome manufacturing method according to an embodiment of the present invention, energy can be reduced by the heat of reaction as the reaction occurs quickly and uniformly in the briquetting process.

1 shows a schematic overall process sequence of a ferrochrome manufacturing method according to an embodiment of the present invention.
Figure 2 is a photo of the raw material and briquettes of the embodiment of the present invention.
3 is a photograph of a sample recovered after the reduction reaction of an embodiment of the present invention.
Figure 4 is a raw material of the comparative example of the present invention and a photograph of briquetting it.
5 is a photograph of the finally produced product of Comparative Example of the present invention.

In this specification, in order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

In this specification, the terminology used is for the purpose of referring to specific embodiments only, and is not intended to limit the present invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and includes the presence or absence of another characteristic, region, integer, step, operation, element and/or component. It does not exclude additions.

Although not defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Commonly used terms defined in the dictionary are additionally interpreted as having a meaning consistent with the related technical literature and the presently disclosed content, and unless defined, they are not interpreted in an ideal or very formal meaning.

In addition, unless otherwise specified, % means weight %, and 1 ppm is 0.0001 weight %.

Ferrochrome manufacturing method according to an embodiment of the present invention comprises the steps of preparing a reducing agent containing Si and SiC; A raw material preparation step comprising a chromium mineral and a reducing agent; and smelting raw materials.

1 shows a schematic overall process sequence of the ferrochrome manufacturing method according to an embodiment of the present invention.

Each step will be described with reference to FIG. 1 .

First, a reducing agent containing Si and SiC is prepared.

In the step of preparing the reducing agent, the reducing agent may include silicon sludge.

More specifically, the step of preparing the reducing agent, preparing a silicon sludge generated while processing a silicon wafer for solar or semiconductor; and separating the sludge powder by removing moisture and oil from the silicone sludge, and using the sludge powder as a reducing agent.

The reason for using silicon sludge generated while processing silicon wafers for sunlight or semiconductors is as follows. In reducing ferrochrome, it is common to reduce energy when aluminum, silicon, and magnesium metals are used. However, since the above metals are expensive, it was intended to replace low-cost raw materials. Therefore, in the present invention, a large amount of silicon sludge generated while processing silicon wafers for solar light and semiconductors is used to replace existing carbonization reducing agents such as coke.

Silicon sludge contains moisture, oil, silicon carbide abrasive, silicon cutting powder, etc., so a powder from which moisture and oil have been removed through a separation process can be used.

On the other hand, the SiC content of the silicon sludge can be variously changed from 20 to 80% by weight. More specifically, it may be 40 to 60% by weight. More specifically, it may be 45 to 55% by weight. If the content of SiC in the silicon sludge is too small, there is a disadvantage that Si is introduced into the product, and if the content of SiC is too large, the reactivity decreases.

Also, in the silicon sludge, [Si]/[SiC] may be 0.25 to 4.0. Here, [Si] means the weight % of Si, and [SiC] means the weight % of SiC.

Further, the moisture content of the silicone sludge may be 20% by weight or less. More specifically, it may be 10 wt% or less. More specifically, it may be 5 wt% or less. If the moisture content of the silicon sludge is too high, there is a disadvantage in that the energy consumed in the reaction increases.

On the other hand, silicon sludge powder contains silicon (Si) and silicon carbide (SiC) at the same time. At a high temperature of 1500° C. or higher, both silicon and silicon carbide can be used as reducing agents, so both silicon and silicon carbide can be used as reducing agents in the sludge powder.

Next, a raw material containing a chromium mineral and a reducing agent is prepared. In this case, the raw material may include a chromium mineral, a reducing agent, starch, and water glass.

In the case of chromium minerals, chromium minerals are used to manufacture 1 ton of ferrochrome, and the amount of chromium minerals needs to be adjusted depending on the component, but approximately 2.0 to 2.4 tons are used. For chromium minerals, the most common spectroscopy can be directly applied.

In the case of a reducing agent, it can be determined coherently by measuring the amounts of chromium oxide and iron oxide in the mineral. That is, the amount of chromium oxide and iron oxide of the mineral is measured and calculated and added to the equivalent. In an embodiment of the present invention, Si and SiC are used as reducing agents, and the amount is calculated based on the following reaction equation.

[Formula 1] Cr ₂ O ₃ + 1.5Si = 2Cr + 1.5SiO ₂

[Formula 2] Cr ₂ O ₃ + SiC = 2Cr + SiO ₂ + CO

[Equation 3] Fe ₂ O ₃ + 1.5Si = 2Fe + 1.5SiO ₂

[Equation 4] Fe ₂ O ₃ + SiC = 2Fe + SiO ₂ + CO

When calculating the amount based on Equations 1 to 4, after calculating the Si and SiC equivalents corresponding to the amounts of chromium oxide and iron oxide, 0.8 to 1.2 may be prepared based on equivalent 1. More specifically, it can be prepared in 0.9 to 1.1. When the amount of Si and SiC based on equivalent 1 is too small, there is a disadvantage in that the recovery rate of chromium is lowered, and when the amount of Si and SiC is too large, there is a disadvantage in that the content of silicon impurities in the product increases.

More specifically, the amount of Si and SiC may be prepared as 1 based on the equivalent weight of 1.

Its calculation method is as follows, for example.

27.6 g of Si per 100 g of Cr ₂ O ₃ is required, and 26.4 g of SiC is required. The amount of Si required per 100 g Fe ₂ O ₃ is 26.3 g, and the amount of SiC is 25.0 g.

_{The amount of Cr 2} O ₃ and Fe ₂ O ₃ present in the mineral can be measured through XRF or ICP analysis, and the amount can be calculated and added through the above formula.

Since Si and SiC are mixed in the sludge, and the content of SiC is varied from 20 to 80 wt%, the amount of the reducing agent is determined by applying the above formula according to the components of the sludge to be supplied.

Through the above calculation, it is possible to increase the strength in the briquetting process, which is the next process, by mixing the chromium ore and the sludge reducing agent, and adding 5 to 10% by weight of starch and water glass.

Next, it may further include a briquetting step of preparing the blended raw material into a briquette.

First, a chromium mineral, a reducing agent, starch and water glass are mixed, and at this time, it can be uniformly mixed by using a mixer. The mixed raw materials are made into lumps by applying pressure using briquetting equipment. The briquettes may be 5-10 cm in diameter.

At this time, if the briquette contains moisture, it is dried through a dryer, and the final briquetteted raw material can be dried so that the moisture content is 10% by weight or less. That is, the moisture content of the briquettes may be 10% by weight or less. More specifically, it may be 5 wt% or less. If the moisture content of the briquettes is too high, the energy consumed increases.

The process of briquetting is a necessary process because most of the chromium ore is present in the form of powder. At this time, if the silicon sludge powder is mixed and briquette is performed, uniform mixing with the reducing agent is possible. In addition, it is possible to increase the strength of the briquette, it is possible to reduce energy as the reaction occurs quickly and uniformly.

Next, it includes the step of smelting the raw material.

In this case, the smelting may include a reduction reaction step of reacting the raw material in an arc furnace.

In this stage, the initial arc generating operation, which is generally performed in the ferroalloy operation, can be performed. For the initial arc operation, a conductive material such as iron scrap or coke is put in, preheating and initial arc are generated, and when sufficient heat and arc are secured, the mixed ore raw material prepared in the above process is added thereafter. As the raw materials react, a metal and slag melt are generated, and the arc is sufficiently maintained to separate the two materials by the density difference. The arc is maintained for several hours to achieve this metal slag separation.

At this time, CaO or CaF2 component may be added to ensure fluidity of the molten slag, and 10 to 30 wt% may be added to the briquetting step, and may be additionally added during the smelting process.

When the reduction reaction is carried out using silicon sludge powder, the SiO2 component is increased in the chrome ore, and the melting temperature of the slag is lowered, the reaction time can be shortened, and energy can be reduced. By using the silicon sludge reducing agent, it is possible to lower the high carbon content contained in general ferrochrome, thereby making it possible to manufacture low-carbon ferrochrome. The lower the carbon content, the higher the importance is because carbon control is advantageous in the stainless steel manufacturing process, but there is a problem in that the price increases because an additional refining process to lower the carbon content must be performed. Silicon sludge powder can be applied without a separate refining process and can produce products with low carbon content.

Next, a refining step of tapping the reduced metal and adjusting the composition; a casting step of casting the conditioned metal; and crushing the cast metal to commercialize the product.

In the arc process, the arc is maintained for several hours so that the metal slag is separated, and then, when sufficient separation is achieved through tracing the slag component, the slag and the metal are tapped into the ladle. A refining process may be added if necessary after identifying the tapped components. In the refining process, the silicon content can be lowered or the carbon content can be adjusted by blowing oxygen. In addition, a step of reducing the sulfur component by adding calcium carbide or quicklime may be added. When the composition of the product reaches the desired composition, it can be poured into a casting mold and commercialized.

In addition, the manufactured product can be crushed to a certain size and commercialized. The product made at this time is ferrochrome with a low carbon content, and it can be applied to processes and products requiring low carbon in the Spanish lease process.

On the other hand, the reducing agent for ferrochrome according to an embodiment of the present invention includes Si and SiC.

The Si and Sic of the reducing agent may be from silicon sludge. More specifically, it may be caused by silicon sludge generated while processing a silicon wafer for solar or semiconductor.

On the other hand, the SiC content of the silicon sludge can be variously changed from 20 to 80% by weight. More specifically, it may be 40 to 60% by weight. More specifically, it may be 45 to 55% by weight. If the SiC content in the silicon sludge is too small, there is a disadvantage in that the recovery rate of chromium decreases, and if the SiC content is too large, there is a disadvantage in that the silicon content in the product increases.

Hereinafter, the present invention will be described in more detail through examples. However, it is necessary to note that the following examples are only intended to illustrate the present invention in more detail and are not intended to limit the scope of the present invention. This is because the scope of the present invention is determined by the matters described in the claims and matters reasonably inferred therefrom.

[Experimental example]

Examples 1 to 7

As the raw material product, chromium minerals with the components shown in Table 1 below were used.

Equivalent calculations were performed on minerals. When a total of 1 ton of minerals is input, the amount of Si required as an equivalent is 200 kg and the amount of SiC is 190 kg. Since Si sludge is a mixture of both, 1 ton of mineral, 200 kg of dry sludge, and 100 kg of starch and water glass were mixed to prepare the raw material with consideration for the loss.

Cr ₂ O ₃ Fe ₂ O ₃ SiO ₂ Al ₂ O ₃ MgO content (wt%) 49.4 23.5 3.4 14.3 9.4

Contents of Si and SiC in the silicon slurry are shown in Table 2 below.

SiC (wt%) Si (wt%) [Si]/[SiC] (weight ratio) Example 1 19 81 4.26 Example 2 20 80 4.0 Example 3 40 60 1.5 Example 4 60 40 0.67 Example 5 80 20 0.25 Example 6 81 19 0.23 Example 7 100 0 0

The prepared raw material was prepared in the form of a briquette by mixing some water and mixing it uniformly, and then putting it into a briquetting equipment. The prepared briquettes were placed at room temperature or in an oven to remove moisture, and the moisture content was set to 10% or less. A photograph of the raw material in Example 3 is shown in FIG. 2 .

After that, the reduction reaction was performed using a 280kW class direct current arc furnace with a power supply. The raw material loading amount was 160 kg based on the briquette. The input voltage was maintained at 40~60V and the input current was adjusted around 1200A. The average input power is 66kW and the total reaction time is 4.3 hours. A sample recovered after the reaction in Example 3 is shown in FIG. 3 .

Looking at the results of Example 3, the amount of ferrochrome product produced was 46kg, and the amount of slag produced was 92kg. The power ratio used to produce 1 kg of product was 6.1 kWh/kg. As a result of the operation, there were almost no unreacted residues and the operation proceeded stably. As for the components of the manufactured product, it was confirmed that a product having a chromium content of 61.3% and a carbon content of 1.90% was produced.

comparative example

In order to perform comparison with silicon sludge reduction, a reduction experiment was conducted for the same mineral using petroleum coke.

When using 1 ton of chromium mineral, the raw materials were mixed using 100 kg of starch and water glass binder in the same way. In the same way, some moisture was added and uniformly mixed, and a briquette was prepared. Finally, through a drying process, the moisture content was adjusted to 10% or less. The raw material used as the reducing agent was low ash coal, and 200 kg was used based on the fixed carbon content. In addition, in order to lower the melting point of the slag component, 80 kg of silica was used in the same manner as in the existing commercial process. Coal and silica were not mixed in the briquettes, but were separately put into the process. A photograph of the prepared raw material is shown in FIG. 4 .

The operation was carried out using the same equipment as in Example 3. The input voltage is 30 ~ 50V and the input current is around 1500A. The average input power is 67kW and the total reaction time is 5.9 hours. A photograph of the finally produced product is shown in FIG. 5 . The amount of produced ferrochrome was 29.2 kg, and the power consumption per 1 kg of product was 13.6 kWh/kg. In general, a large number of unreacted raw materials were generated, and the raw material surface was unstable and the molten metal was scattered frequently. In the component content of the final product, it was confirmed that the chromium was 58.8% and the carbon content was 1.87%.

[result]

The product manufactured according to the embodiment may produce a product having a carbon content of 4% or less, and when using a silicon sludge briquette, power consumption per 1 kg of product can be reduced compared to when using conventional coal. The contents are shown in Table 3. In addition, as shown in Table 4, when comparing the ratio of the recovered product to the input, when silicon sludge is used, 79% in Example 3 is superior to 54% using coal. When used in an arc furnace of several MW or more, the error rate may appear similar to 80% or more, but energy consumption is significantly reduced, which can contribute to cost reduction.

In addition, when comparing Examples 2 to 5 with Examples 1 and 6, if the content of SiC in the silicon sludge is too small, the silicon content in the product increases and the components of impurities increase. If there are too many, there is a disadvantage in that energy consumption increases.

On the other hand, when comparing Examples 2 to 5 and Example 7, when SiC is properly mixed with Si than when only SiC is present in the silicon sludge, energy is saved and the product components are well manufactured.

Silicon sludge briquetting process Coal reduction - a commercial process Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 comparative example power variable Voltage 40 to 60 V 40 to 60 V 40 to 60 V 40 to 60 V 40 to 60 V 40 to 60 V 40 to 60 V 30-50 V electric current ~1200 A ~1200 A ~1200 A ~1200 A ~1200 A ~1200 A ~1200 A ~1500 A average power
(Preheat
time
except) 66 kW 66 kW 66 kW 66 kW 66 kW 66 kW 66 kW 67 kW reaction
time
(Preheat
time
except) 4.2 h 4.3 h 4.4 h 4.5 h 4.6 h 4.7 h 4.8 h 5.9 h final input
power 277 kWh 281 kWh 290 kWh 297 kWh 303 kWh 310 kWh 317 kWh 397 kWh material balance FeCr
amount of production 46 kg 46 kg 46 kg 46 kg 46 kg 46 kg 46 kg 29.2 kg Slag
amount of production 92 kg 92 kg 92 kg 92 kg 92 kg 92 kg 92 kg 26 kg unreacted raw material 0 kg 0 kg 0 kg 0 kg 0 kg 0 kg 0 kg 32 kg Dust generation 1.08 kg 1.08 kg 1.08 kg 1.08 kg 1.08 kg 1.08 kg 1.08 kg 0.36 kg Power cost per product 6.02 kWh/kg 6.08 kWh/kg 6.31 kWh/kg 6.45 kWh/kg 6.60 kWh/kg 6.74 kWh/kg 6.88 kWh/kg 13.6 kWh/kg

sample NO Calculation of recovery chrome ore
(kg) Ferrochrome at 100% recovery (kg) Actual recovered ferrochrome
(kg) recovery rate
(%) Example 1 123.0 58.2 46.0 79.1 Example 2 123.0 58.2 46.0 79.1 Example 3 123.0 58.2 46.0 79.1 Example 4 123.0 58.2 46.0 79.1 Example 5 123.0 58.2 46.0 79.1 Example 6 123.0 58.2 46.0 79.1 Example 7 123.0 58.2 46.0 79.1 comparative example 113.5 53.8 29.2 54.4

The present invention is not limited to the above embodiments, but may be manufactured in various different forms, and those of ordinary skill in the art to which the present invention pertains will have other specific forms without changing the technical spirit or essential features of the present invention It will be understood that it can be implemented as Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims (14)

Preparing a reducing agent containing Si and SiC;
A raw material preparation step comprising a chromium mineral and the reducing agent; and
smelting the raw material;
A method for producing ferrochrome comprising a.
According to claim 1,
In the step of preparing the reducing agent;
The reducing agent is a method for producing ferrochrome comprising silicon sludge.
3. The method of claim 2,
The content of SiC in the silicon sludge is 20 to 80% by weight of ferrochrome manufacturing method.
3. The method of claim 2,
In the silicon sludge, [Si] / [SiC] is 0.25 to 4.0 ferrochrome manufacturing method.
(Here, [Si] means the weight % of Si, and [SiC] means the weight % of SiC.)
According to claim 1,
The raw material preparation step;
A method for producing ferrochrome comprising a chromium mineral, a reducing agent, starch and water glass.
According to claim 1,
In the raw material preparation step comprising the chromium mineral and the reducing agent;
The amount of the reducing agent, the method for producing ferrochrome is determined by measuring the amounts of chromium oxide and iron oxide present in the chromium mineral.
7. The method of claim 6,
In the raw material preparation step comprising the chromium mineral and the reducing agent;
The amount of the reducing agent is prepared by measuring the amounts of chromium oxide and iron oxide present in the chromium mineral, and calculating the equivalent by substituting the formulas 1 to 4 below.
[Formula 1] Cr ₂ O ₃ + 1.5Si = 2Cr + 1.5SiO ₂
[Formula 2] Cr ₂ O ₃ + SiC = 2Cr + SiO ₂ + CO
[Equation 3] Fe ₂ O ₃ + 1.5Si = 2Fe + 1.5SiO ₂
[Equation 4] Fe ₂ O ₃ + SiC = 2Fe + SiO ₂ + CO
8. The method of claim 7,
The amount of the reducing agent is prepared by measuring the amounts of chromium oxide and iron oxide present in the chromium mineral, calculating the equivalent by substituting it in Equations 1 to 4, and preparing it as 0.8 to 1.2 based on equivalent 1 How to make chromium.
According to claim 1,
the raw material preparation step; after,
a briquetting step of preparing the raw material into briquettes;
Ferrochrome manufacturing method further comprising a.
According to claim 1,
smelting the raw material;
A method for producing ferrochrome comprising a reduction reaction step of reacting the raw material in an arc furnace.
According to claim 1,
smelting the raw material; after,
A refining step of tapping the reduced metal and controlling the composition;
a casting step of casting the conditioned metal; and
A commercialization step of crushing the cast metal into a product;
Ferrochrome manufacturing method further comprising a.
A reducing agent for producing ferrochrome containing Si and SiC.
13. The method of claim 12,
Si and SiC of the reducing agent is a reducing agent for ferrochrome production resulting from silicon sludge.
13. The method of claim 12,
The SiC content of the silicon sludge is 20 to 80% by weight of a reducing agent for producing ferrochrome.

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