KR20130097935A - Desulphurization agent for ferronickel molten metal and method of desulfurizing for ferronickel molten metal using the same - Google Patents

Desulphurization agent for ferronickel molten metal and method of desulfurizing for ferronickel molten metal using the same Download PDF

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KR20130097935A
KR20130097935A KR1020120019615A KR20120019615A KR20130097935A KR 20130097935 A KR20130097935 A KR 20130097935A KR 1020120019615 A KR1020120019615 A KR 1020120019615A KR 20120019615 A KR20120019615 A KR 20120019615A KR 20130097935 A KR20130097935 A KR 20130097935A
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South Korea
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desulfurization
molten iron
ferronickel
agent
particle size
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KR1020120019615A
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Korean (ko)
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이규동
노광호
김치환
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주식회사 에스엔엔씨
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Priority to KR1020120019615A priority Critical patent/KR20130097935A/en
Publication of KR20130097935A publication Critical patent/KR20130097935A/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C21C1/025—Agents used for dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PURPOSE: A desulfurizing agent for ferronickel containing molten iron and a desulfurizing method using the same are provided to improve the desulfurization rate of ferronickel containing molten iron by minutely limiting the particle size of the desulfurizing agent. CONSTITUTION: A desulfurizing method using a desulfurizing agent for ferronickel containing molten iron comprises the following steps. The particle size of a desulfurizing agent (3), which is input into ferronickel containing molten iron, is less than 2 mm per 1 ch of desulfurization of the ferronickel containing molten iron; the amount of the input desulfurizing agent is less than 800 Kg; and the time for desulfurization is less than 35 minutes. The desulfurizing agent is calcium carbide (CaC2). The desulfurizing agent for the ferronickel containing molten iron is 2 mm or less in particle size. [Reference numerals] (3) Desulfurizing agent

Description

DESULPHURIZATION AGENT FOR FERRONICKEL MOLTEN METAL AND METHOD OF DESULFURIZING FOR FERRONICKEL MOLTEN METAL USING THE SAME}

The present invention relates to a desulfurization agent for ferronickel molten iron and a method for desulfurization of ferronickel molten iron using the same, and more particularly, to finely adjust the particle size of the desulfurizing agent to improve the desulfurization rate of ferronickel molten iron. It relates to a method for desulfurization of ferronickel molten iron using the same.

Stainless steel is a special steel with improved corrosion resistance. Stainless steel contains chromium and nickel as main components. Nickel contained in stainless steel is added as ferronickel type in refining molten steel of stainless steel. Ferronickel is prepared by treating ore containing iron (Fe) and nickel (Ni) in large quantities.

Ferronickel production method is a dry manufacturing method is a method of manufacturing ferronickel by melting or reducing the ore in the electric furnace. The main processes include raw material processing, drying, preliminary reduction, melt reduction (electric furnace), refining and casting, and finally produce ferronickel containing about 20% nickel and 80% iron.

In particular, the refining process is a process of adjusting and removing components such as carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), and the like contained in the ferronickel molten iron. S) is difficult to remove in the converter process, so it is removed during the charter preliminary treatment process before the converter process. The charter preliminary treatment process uses a mechanical stirring facility (Kanvara Reactor, hereinafter referred to as KR facility).

1 is a view showing a typical KR process, KR equipment is ferronickel molten iron (1) is accommodated in the ladle 10 and the ferronickel molten iron (1) in the ladle 10 is rotated at a constant speed as the ferro It consists of an impeller 20 which stirs the nickel molten iron 1. In order to desulfurize the ferronickel molten iron 1 using this KR facility, the impeller 20 is first operated so that the ferronickel molten iron 1 is mechanically stirred. At this time, the desulfurizing agent 3 is added to the ladle 10 so that the ferronickel molten iron 1 and the desulfurizing agent 3 react to separate the sulfur contained in the ferronickel molten iron 1 in the form of slag 2.

Desulfurizing agent used in the desulfurization process of chartering Ferronickel is using CaO, CaC 2, CaF 2, etc., rather expensive, but good reaction efficiency CaC 2 There are many kinds of ferro-nickel desulfurization treatment of molten iron.

Desulfurization of CaC 2 and ferronickel molten iron is carried out as in Chemical Formula 1 below.

CaC 2 + S → CaS +2 [C] ------- [Formula 1]

In other words, the reaction between the ferronickel molten iron and the desulfurization agent occurs first at the interface of the desulfurization agent, and the sulfur (S) is diffused into the desulfurization agent while the CaS layer is formed at the interface of the desulfurization agent by the reaction as shown in Formula 1 above. CaS reacted in this way is injured and collected in slag.

On the other hand, in the prior art, the particle size standard of CaC 2 used as the desulfurization agent was not provided, and accordingly, desulfurization treatment of ferronickel molten iron was performed using CaC 2 having various particle sizes. Typically, ferronickel producers used CaC 2 having a particle size of 0.5 to 5 mm, and the average desulfurization rate was about 35% when using CaC 2 having the above-described particle size.

Since the desulfurization rate by the desulfurization agent is low, the amount of the desulfurization agent used in the desulfurization treatment increases, resulting in the generation of a large amount of unreacted CaC 2 in the desulfurization slag, resulting in the generation of acetylene gas (H 2 C 2 ) and the desulfurization slag discharge rate. An increasing problem has arisen.

On the other hand, the desulfurization agent for the desulfurization treatment of molten iron produced in the blast furnace in the past has been studied a lot of various desulfurization agents have been proposed. For example, it is known in "Molten release agent (patent patent 10-0325710)", "Floating agent for blast furnace pretreatment and its manufacturing method (Patent Publication 10-1998-051233)".

However, the conventional desulfurization agent is a desulfurization agent for the desulfurization treatment of the molten iron for producing steel products produced in the blast furnace, and was prepared by combining various components that react well with sulfur (S). However, ferronickel molten metal is used to produce ferronickel added as a feedstock for the production of stainless steel, and a single component desulfurization agent is used to suppress the inclusion of impurities in the refined ferronickel molten steel. Accordingly, studies on desulfurization agents to improve the desulfurization rate of ferronickel molten iron have been insufficient.

Patent Registration 10-0325710 (2002. 02. 08) Patent Publication 10-1998-051233 (1998. 09. 15)

The present invention provides a desulfurization agent for ferronickel molten iron that can improve the desulfurization rate of ferronickel molten iron by finely adjusting the particle size of the desulfurizing agent and a method for desulfurization of ferronickel molten iron using the same.

The desulfurization agent for ferronickel molten iron according to an embodiment of the present invention is a desulfurization agent used for the desulfurization treatment of ferronickel molten iron, and the particle size of the desulfurization agent is 2 mm or less.

At this time, the desulfurization agent is preferably calcium carbide (CaC 2 ).

Desulfurization treatment method of ferronickel molten iron according to an embodiment of the present invention is a method for desulfurizing the ferronickel molten iron by adding a desulfurization agent, the particle size of the desulfurizing agent to be added to the ferronickel molten iron per 1ch desulfurization treatment of ferronickel molten iron. Below, the amount of desulfurization agent added is less than 800Kg, the desulfurization treatment time is characterized in that the treatment is shorter than 35 minutes.

At this time, the desulfurization agent is preferably calcium carbide (CaC 2 ).

According to the embodiments of the present invention, the desulfurization efficiency of the ferronickel molten iron is improved by using a desulfurization agent having a finely limited particle size as compared with the conventional art.

In addition, as the desulfurization efficiency is improved by adjusting the particle size of the desulfurization agent, the amount of desulfurization agent added can be reduced, and the effect of shortening the desulfurization treatment time can be obtained.

In addition, it is possible to reduce the temperature change of the ferronickel molten iron before and after the desulfurization treatment, it is possible to reduce the amount of desulfurization slag generated.

1 is a view showing a typical KR process,
2 is a graph comparing the desulfurization efficiency of the desulfurization agent having various particle sizes,
Figure 3a is a photograph showing the particle size of the conventional desulfurization agent,
3b is a photograph showing the particle size of the desulfurization agent according to the present invention,
Figure 4a is a photograph showing the desulfurization slag generated when the desulfurization treatment using a conventional desulfurization agent,
Figure 4b is a photograph showing the desulfurization slag generated when the desulfurization treatment using a desulfurization agent according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know.

First, the desulfurization agent according to an embodiment of the present invention is a desulfurization agent used for the desulfurization treatment of ferronickel molten iron for producing ferronickel.

The desulfurization agent uses CaC 2 (calcium carbide) having good reaction efficiency with sulfur contained in the ferronickel molten iron.

At this time, it is preferable to limit the particle size of the CaC 2 to 2mm or less. For example, CaC 2 is crushed to have a particle size of 2 mm or less.

This would make the CaC 2 crushing CaC 2 will have a particle size distribution as shown in Table 1 below.

Granularity ratio 0.3mm or less below 10 0.3 ~ 0.5mm 10 to 15% 0.5 to 1.0mm 40 to 45% 1.0 to 2.0mm 30 to 35% 2.0mm Less than 3%

The reason for finely limiting the particle size of the desulfurizing agent as described above is as follows.

In the case of the same weight of desulfurization agent, the smaller the particle size, the more the interface area between the desulfurization agent and the ferronickel molten iron increases. If the interfacial area is increased by making the particle size fine, it is possible to promote the reaction between the ferronickel molten iron and the desulfurization agent.

In particular, in order to explain the reason for limiting the particle size of the desulfurization agent to 2 mm or less, the desulfurization agent was classified into 4 types by particle size, and then desulfurization test was performed for each particle size of the desulfurization agent.

The ferronickel molten iron was desulfurized under the same operating conditions by using the same amount of desulfurization agent for each particle size so that the final [S] content was 0.06% or less after the desulfurization of the 55 ton molten iron molten iron.

Classification by particle size of the desulfurization agent is shown in Table 2 below.

division Granularity Particle size distribution case A Less than 0.5mm 95% case B 0.5 to 2.0mm 95% case C 2.0 to 5.0mm 95% case D 5.0-10mm 95%

As shown in Table 2, the desulfurization treatment was performed for each particle size of the desulfurization agent, and the desulfurization rate of each case was measured.

At this time, the desulfurization rate was defined as in Equation 1 below.

[Formula 1]

Figure pat00001

The desulfurization rate result calculated by Equation 1 is shown in FIG. 2.

As shown in FIG. 2, case A and case B showed desulfurization rates of about 50%, and case C and case D showed desulfurization rates of 34% and 25%.

As a result, it can be seen that the desulfurization rate is lowered as the particle size of the desulfurization agent increases, and when the particle size of the desulfurization agent is 2.0 mm or less, the desulfurization rate is not further improved. .

Thus, it was confirmed that the maximum desulfurization efficiency can be obtained when the particle size of the desulfurization agent is limited to 2.0 mm or less.

On the other hand, since the desulfurization efficiency can be improved by limiting the particle size of the desulfurization agent to 2.0 mm or less as described above, the amount of desulfurization agent in the operation of desulfurizing the ferronickel molten iron can be reduced, and the desulfurization treatment time can be shortened.

Accordingly, when the particle size of the anti-deodorant is limited to 2.0 mm or less, the amount of the desulfurization agent added to the ferronickel molten iron per 1 ch of the desulfurization of the ferronickel molten iron is less than 800 kg, and the desulfurization treatment time is preferably shorter than 35 minutes. .

The effect of the improvement of the operation process according to the particle size limit of the desulfurization agent is shown in Table 3 below.

At this time, the comparative example was a desulfurization industry using a conventional desulfurization agent, and CaC 2 was used as the desulfurization agent. And the embodiment according to the present invention used CaC 2 as in the comparative example, wherein the particle size was limited to 2.0mm or less (Fig. 3b).

division Comparative example Example effect Desulfurization Rate (%) 38 80 90% improvement Input amount (Kg / ch) 807 657 150kg savings Desulfurization time (minutes) 35 28 20% reduction Melting temperature change before and after process (℃) -26.7 -16.6 38% improvement Desulfurization slag generation amount (ton) 1.3 1.0 23% reduction

As shown in Table 2, according to the embodiment according to the present invention as compared to the conventional comparative example, it is possible to improve the desulfurization rate, reduce and shorten the amount and desulfurization time of the desulfurization agent, the temperature change of the molten iron before and after the process It was confirmed that the effect can be reduced and the effect of reducing the amount of desulfurized slag generated can be obtained.

In particular, Figure 4a is a photograph showing a desulfurization slag generated when the desulfurization treatment using a conventional desulfurization agent, Figure 4b is a photograph showing a desulfurization slag generated when the desulfurization treatment using a desulfurization agent according to the present invention, As can be seen from 4a and 4b it can be seen that the residual ratio of unreacted CaC 2 in the desulfurization slag also decreased in the Example compared to the comparative example.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

1: ferronickel molten iron 2: slag
3: desulfurization agent 10: ladle
20: Impeller

Claims (4)

Desulfurization agent used for desulfurization of ferronickel molten iron,
Desulfurization agent for ferronickel molten iron, characterized in that the particle size of the desulfurization agent is 2mm or less. The method according to claim 1,
The desulfurization agent is a sulfur desulfurization agent for ferronickel molten iron, characterized in that the calcium carbide (CaC 2 ). As a method of desulfurizing ferronickel molten iron by adding a desulfurization agent,
Ferronickel molten iron, characterized in that the desulfurization agent added to the ferronickel molten iron per 1 ch of the ferronickel molten iron has a particle size of 2 mm or less, the amount of the desulfurizing agent added is less than 800 kg, and the desulfurization treatment time is shorter than 35 minutes. Desulfurization treatment method. The method according to claim 3,
The desulfurization agent is a method of desulfurization of ferronickel molten iron, characterized in that the calcium carbide (CaC 2 ).
KR1020120019615A 2012-02-27 2012-02-27 Desulphurization agent for ferronickel molten metal and method of desulfurizing for ferronickel molten metal using the same KR20130097935A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103566719A (en) * 2013-10-28 2014-02-12 沈阳化工大学 Method for preparing raw material of desulfurizing agent by using waste chlorination molten salt generated in production of TiCl4
KR20230138221A (en) 2022-03-23 2023-10-05 주식회사 포스코 Desulfurization material for ferronikel molten metal and Method for processing ferronikel molten metal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103566719A (en) * 2013-10-28 2014-02-12 沈阳化工大学 Method for preparing raw material of desulfurizing agent by using waste chlorination molten salt generated in production of TiCl4
CN103566719B (en) * 2013-10-28 2016-04-06 沈阳化工大学 Utilize and produce TiCl 4the waste chlorination molten salt produced prepares the method for desulfurizing agent raw material
KR20230138221A (en) 2022-03-23 2023-10-05 주식회사 포스코 Desulfurization material for ferronikel molten metal and Method for processing ferronikel molten metal

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