KR20010060907A - BOP Slag dephosphorization - Google Patents

BOP Slag dephosphorization Download PDF

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KR20010060907A
KR20010060907A KR1019990063365A KR19990063365A KR20010060907A KR 20010060907 A KR20010060907 A KR 20010060907A KR 1019990063365 A KR1019990063365 A KR 1019990063365A KR 19990063365 A KR19990063365 A KR 19990063365A KR 20010060907 A KR20010060907 A KR 20010060907A
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slag
phosphorus
vaporization
coal
reducing
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KR1019990063365A
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Korean (ko)
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손호상
윤병훈
허기행
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이구택
포항종합제철 주식회사
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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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

PURPOSE: A method for accelerating the removal of phosphorous of converter slag by introducing coal as a reducing agent into a slag layer in a powder state and SiO2 is provided, which has an effect on improving quality of molten pig iron by reducing the amount of phosphorous of molten pig iron and the cost of production without using expensive Al. CONSTITUTION: In a reducing treatment method for removing phosphorous of converter slag, coal is introduced into a slag layer in a powder state as a reducing agent by using Ar gas as a conveying source and SiO2 is introduced to be a basicity CaO/SiO2 of slag of 0.9 to 2.0.

Description

전로슬래그중 인의 기화제거 촉진법{BOP Slag dephosphorization}BOP Slag dephosphorization method of phosphorus vaporization in converter slag

본 발명은 전로슬래그중 인의 기화제거 촉진법에 관한 것으로 슬래그중에 함유된 인이 환원처리되는 과정에서 인을 대기중으로 배출시켜 회수하고자 하는 용선 및 환원 슬래그중 인의 농도를 최소로하는 방법에 관한 것이다.The present invention relates to a method for promoting the vaporization of phosphorus in the converter slag and a method for minimizing the concentration of phosphorus in the molten iron and reducing slag to be recovered by discharging the phosphorus into the atmosphere during the reduction process of phosphorus contained in the slag.

일반적으로 용강을 제조하는 전로에서 발생되는 전로의 슬래그 성분은 아래표에 도시된 바와 같은 성분을 함유한다.In general, the slag component of the converter generated in the converter for producing molten steel contains a component as shown in the table below.

TFeTFe CaOCaO SiO2 SiO 2 Al2O2 Al 2 O 2 P2O5 P 2 O 5 TiO2 TiO 2 SS 36.036.0 29.029.0 10.310.3 3.03.0 1.451.45 1.31.3 1.451.45

상술한 성분중 TFe는 환원시 Fe로 회수하여 사용하며 이러한 방법은 대한민국 특허출원 No 97-31818호 출원되어 있다.Among the above-mentioned components, TFe is recovered and used as Fe during reduction, and this method has been filed in Korean Patent Application No. 97-31818.

또한 인의 환원시 인을 용철이나 환원슬래그중에 잔류시키지 않고 대기 배출하여 제거하는 방법중 한 방법으로 인의 환원시 전로슬래그중 TFe가 3∼5중량%에 도달시 알루미늄에 의한 강환원을 유도시킴으로 인의 기화제거율을 높여주는 방법에 관한 것도 대한민국 출원번호 1996-38485로 공지되어 있으며, 기 사용되고 있다.In addition, one of the methods of removing phosphorus by removing it from the air without removing it from molten iron or reducing slag during reduction of phosphorus.In case of reduction of phosphorus, when TFe reaches 3 to 5% by weight, phosphorus vaporization is induced by aluminum. The method of increasing the removal rate is also known as Republic of Korea Application No. 1996-38485, it is already used.

그러나 상술한 인의 기화제거율을 높여주는 종래기술은 TFe농도가 3∼5중량%를 유지하여야 하나 공정중 TFe의 농도를 정확히 측정하기 어려워 경험에 의존하여야 하는 문제로 작업자마다 추정치에 오차가 있어 불량의 원인이 되는 문제와 종래기술에서 사용되는 알루미늄은 고가로서 생산원가를 증대시키는 문제가 있었다.However, the above-mentioned prior art for increasing the vaporization removal rate of phosphorus should maintain the TFe concentration of 3 to 5% by weight, but it is difficult to accurately measure the concentration of TFe during the process, and it is necessary to rely on experience. The problem and the aluminum used in the prior art had a problem of increasing the production cost at a high price.

따라서 본 발명이 이루고자 하는 기술적과제는 상술한 문제점을 해소하며 전로슬래그중 인의 환원시 환원제거량을 향상시키고, 특히 기화제거량을 향상시키는 방법을 제공함에 있다.Therefore, the technical problem to be achieved by the present invention is to solve the above-mentioned problems and to provide a method for improving the reduction removal amount during reduction of phosphorus in the converter slag, and in particular, the amount of vaporization removal.

따라서 본 발명이 이루고자하는 기술적 과제를 성취시키기 위한 구성은 전로슬래그 환원처리 방법에 있어서 Coal을 Ar가스와 함께 분체 취입하여 슬래그에 공급하여 슬래그의 염기도(Cao/SiO2)의 비가 0.9∼2.0 되게 SiO2를 투입함으로 구성된다.Therefore, in order to achieve the technical problem to be achieved by the present invention, in the converter slag reduction treatment method, Coal is blown with Ar gas and supplied to the slag, so that the ratio of slag basicity (Cao / SiO 2 ) is 0.9 to 2.0. It consists of two inputs.

이하 상세히 설명하면 다음과 같다.Hereinafter will be described in detail.

전로슬래그중 인은 P2O5의 형태로 존재하며 환원계 탄소에 의한 환원반응은 다음과 같이 반응이 일어난다.Phosphorus in the converter slag exists in the form of P 2 O 5 and the reduction reaction by reducing carbon occurs as follows.

P2O5+ 5C = P2+5COP 2 O 5 + 5C = P 2 + 5CO

P2= 2PP 2 = 2P

환원된 P2가스는 용철과 만나게 되면 흡수되어 용철의 인 농도를 높이거나, 그대로 대기로 배출제거 되게 된다.The reduced P 2 gas is absorbed when it meets the molten iron to increase the phosphorus concentration of the molten iron, or to be removed to the atmosphere as it is.

따라서 본 발명의 구성은 환원반응에 의해 생성된 P2가스가 용철에 흡수되지 않고 대기로 최대 배출되도록 하는 것으로 슬래그중 SiO2첨가 및 환원제인 Coal의 첨가방법 선택을 통해 기화탈인량을 최대로 하는 것이다.Therefore, the configuration of the present invention allows the P 2 gas generated by the reduction reaction to be discharged to the atmosphere without being absorbed by molten iron to maximize the amount of vaporization dephosphorization by adding SiO 2 in slag and selecting the addition method of Coal as a reducing agent. will be.

이하 실시예에 의해 설명하면 다음과 같다.When described by the following examples.

실시예 1Example 1

유도용해로를 사용하여 실시하였으며 슬래그 용체에 환원제로 Coal과 알루미늄을 각각 투입하여 슬래그 및 용철중의 인의 양을 조사하였다.Induction furnace was used and the amount of phosphorus in slag and molten iron was investigated by adding Coal and aluminum to the slag solution as reducing agents.

반응온도는 1550℃∼1600℃ 구간에서 실시하였으며 환원제의 투입은 상부에서 투입하는 방법을 이용하였다.The reaction temperature was carried out in the 1550 ℃ ~ 1600 ℃ section was added to the reducing agent was used at the top.

상술한 방법으로 실시한 결과 표1과 같은 결과를 얻었다. 표1은 환원제로 사용된 Coal과 알루미늄에 의한 환원슬래그중 존재하는 인의 환원제거 양상을 보여주고 있으며 Al 단독에 의한 환원의 경우 용철중에 잔류하는 인의 초기 인 총량의 65%에 해당되나 SiO2을 첨가하여 슬래그의 CaO/SiO2비를 2로 맞춘 경우 70%로 증가하여 기화탈인율은 31%에서 25%로 감소함을 알 수 있다.The results as described in Table 1 were obtained. Table 1 shows the reduction and removal of phosphorus present in reducing slag by Coal and aluminum used as reducing agent. In case of reduction by Al alone, it corresponds to 65% of the total amount of phosphorus remaining in molten iron, but SiO 2 is added. When the slag CaO / SiO 2 ratio is set to 2, it can be seen that the vaporization dephosphorization rate decreases from 31% to 25%.

또한 Coal을 환원제로 사용한 환원거동에서는 CaO/SiO2 비를 2로 맞추었을 때 용철중 제거되는 인의 양이 51%로 5% 정도 감소되나 기화탈인되는 양이 41%로 19% 정도 증가함을 알 수 있다.In addition, in the reduction behavior using Coal as a reducing agent, when the CaO / SiO2 ratio is set to 2, the amount of phosphorus removed in molten iron decreases by 5% to 51%, but the amount of vaporization dephosphorization increases by 19% to 41%. Can be.

따라서 본 발명의 목적인 기화탈인양을 최대로 하기 위하여는 Al에 의한 환원보다 Coal에 의한 환원이 효과적임을 알 수 있다.Therefore, in order to maximize the vaporization dephosphorization which is the object of the present invention, it can be seen that reduction by Coal is more effective than reduction by Al.

실시예 2Example 2

실시예 2는 실시예 1에서 확인된 Coal을 환원제로 사용하여 CaO/SiO2비인 염기도를 변경시켜 용철중의 인과 슬래그중의 인의 양을 조사하였다.In Example 2, the amount of phosphorus in molten iron and phosphorus in slag was investigated by changing the basicity of CaO / SiO 2 ratio using Coal identified in Example 1 as a reducing agent.

염기도비는 3∼0.5까지 변경실시하였으며, 기타의 실시조건은 실시예 1과 동일하게 실시하였다. 실시예 2에 의한 결과를 표 2에 도시하였다. 표 2는 Coal을 사용하여 환원하는 경우 슬래그의 염기도에 따른 인의 환원제거 양상을 보여주는 것으로 슬래그중 잔류하는 인의 양은 대체로 염기도(CaO/SiO2)가 감소 할수록 감소함을 알 수 있다.The basicity ratio was changed to 3 to 0.5, and the other conditions were carried out in the same manner as in Example 1. The results by Example 2 are shown in Table 2. Table 2 shows the reduction and removal of phosphorus according to the basicity of slag when reducing with Coal. It can be seen that the amount of phosphorus remaining in slag decreases as the basicity (CaO / SiO 2 ) decreases.

또한 기화탈인율이 염기도 3에서 32%이며 염기도 0.9에서 최고 43%로 크게 향상됨을 알 수 있다. 그러나 염기도 0.5로 낮아지는 경우 기화탈인율은 오히려 25%로 감소되고 용철중으로 흡수되는 인의 양이 60%에 가깝게 증가하는 것을 알 수있다.In addition, the degree of vaporization dephosphorization was improved from 32 to 32% in basicity and from 43 to 43% in basicity. However, when the basicity is lowered to 0.5, the vaporization dephosphorization rate decreases to 25%, and the amount of phosphorus absorbed into molten iron increases to nearly 60%.

이는 슬래그 점도에 따른 것으로 염기도가 0.9 이하로 되는 경우 기화탈인율은 감소되어 본 발명의 목적인 기화탈인 양을 증가시키는 것에 역행됨을 알 수 있어 기화탈인양을 최대로 하기 위한 염기도는 0.9∼3.0을 유지함이 적합함을 알 수 있다.This is according to the slag viscosity, and when the basicity becomes 0.9 or less, the vaporization dephosphorization rate decreases, and it can be seen that it is inverse to increasing the amount of vaporization dephosphorization, which is the object of the present invention, and the basicity for maximizing vaporization dephosphorization is 0.9 to 3.0. It can be seen that maintaining is appropriate.

실시예 3Example 3

실시예 3은 환원제인 Coal을 유도로 상부에 투입하는 경우와 Ar가스를 이송원으로 하여 슬래그중으로 분체투입하는 경우의 기화탈인율을 측정한 것으로 염기도는 동일하게 2.0으로 조정하였으며 기타 실시조건은 실시예 1,2와 동일하게 실시하였다.Example 3 measured the vaporization dephosphorization rate in the case of injecting Coal as a reducing agent into the upper part of the furnace and injecting powder into the slag using Ar gas as a transfer source, and the basicity was adjusted to 2.0 in the same manner. It carried out similarly to Example 1,2.

실시예 3에 따른 결과를 표 3에 도시하였다. 표 3에 도시된 바와 같이 Coal 상부투입시 기화탈인율은 42%이며 Ar에 의한 분체투입시 47%로 기화탈인율은 5% 증가함을 알 수 있으며, 또한 전체탈인양을 동등한 수준이나 Ar에 의한 분체투입시약간의 전체 탈인양 증가를 알 수 있다.The results according to Example 3 are shown in Table 3. As shown in Table 3, the vaporization dephosphorization rate was 42% at the top of the coal, and the gasification dephosphorization rate was increased by 5% at 47% when the powder was injected by Ar. The increase in total de-lifting of the powder injection reagent by Ar can be seen.

따라서 실시예에 의한 결과를 종합하면 전로슬래그중 인의 환원시 환원제거량을 향상시키고, 특히 기화제거량을 최대로 하기 위하여는 환원제로 Coal을 사용하며 슬래그의 염기도는 0.9∼2.0이 적합하며 Coal을 투입시 Ar에 의한 분체투입이 효율적인 것을 알 수 있게한다.Therefore, the results of the examples are summarized to improve the reduction removal amount of phosphorus in the slag of the converter slag, and in particular, to maximize the amount of vaporization removal, Coal is used as the reducing agent, and the slag basicity is 0.9 to 2.0. It can be seen that the powder injection by Ar is efficient.

본 발명의 효과로는 전로슬래그중 인의 환원시 용이하고 정확하게 환원제거량을 증대시키며 특히, 기화제거량을 최대로하여 용철중의 인의 량을 감소시켜 용철의 품질향상과 종래 Al투입시 발생되는 작업자간 T Fe 농도측정에 따른 오차에 의한 불량과 고가의 Al 사용에 의한 비용을 절감시키는 효과가 있다.The effect of the present invention is to easily and accurately reduce the reduction removal of phosphorus in the converter slag, and in particular, to maximize the vaporization removal amount to reduce the amount of phosphorus in the molten iron to improve the quality of molten iron and the T between the workers generated during the conventional Al injection There is an effect of reducing the cost of the defect due to the error due to the Fe concentration and the use of expensive Al.

Claims (2)

전로슬래그중 인을 제거하는 환원처리 방법에 있어서, 환원제로 Coal을 투입함과 동시에 슬래그의 염기도(CaO/SiO2)를 0.9-2.0이 유지되게 SiO2를 투입하여 환원하는 전로슬래그중 인의 기화제거 촉진법.In the reduction treatment method for removing phosphorus from the converter slag, vaporization of phosphorus from the converter slag is reduced by adding Coal as a reducing agent and reducing the slag basicity (CaO / SiO 2 ) by adding SiO 2 to maintain 0.9-2.0. Promotion Act. 제1항에 있어서,The method of claim 1, Coal의 투입은 Ar 가스를 이송원으로하여 슬래그층에 분체 투입하는 것을 특징으로 하는 전로슬래그중 인의 기화제거 촉진법.The method of promoting the vaporization of phosphorus in the converter slag, characterized in that the coal is injected into the slag layer by using Ar gas as a transfer source.
KR1019990063365A 1999-12-28 1999-12-28 BOP Slag dephosphorization KR20010060907A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61213309A (en) * 1985-03-19 1986-09-22 Nippon Steel Corp Manufacture of flux for refining using molten pig iron dephosphorization slag as starting material
JPH0211712A (en) * 1988-06-30 1990-01-16 Kawasaki Steel Corp Pre-treating agent for dephosphorization in molten iron
KR970043110A (en) * 1995-12-30 1997-07-26 김종진 Method of reforming steelmaking slag
KR20000020060A (en) * 1998-09-17 2000-04-15 이구택 Removing method of phosphorus from converter slag by vaporization

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61213309A (en) * 1985-03-19 1986-09-22 Nippon Steel Corp Manufacture of flux for refining using molten pig iron dephosphorization slag as starting material
JPH0211712A (en) * 1988-06-30 1990-01-16 Kawasaki Steel Corp Pre-treating agent for dephosphorization in molten iron
KR970043110A (en) * 1995-12-30 1997-07-26 김종진 Method of reforming steelmaking slag
KR20000020060A (en) * 1998-09-17 2000-04-15 이구택 Removing method of phosphorus from converter slag by vaporization

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