JPH0475281B2 - - Google Patents
Info
- Publication number
- JPH0475281B2 JPH0475281B2 JP60151664A JP15166485A JPH0475281B2 JP H0475281 B2 JPH0475281 B2 JP H0475281B2 JP 60151664 A JP60151664 A JP 60151664A JP 15166485 A JP15166485 A JP 15166485A JP H0475281 B2 JPH0475281 B2 JP H0475281B2
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- pig iron
- amount
- received
- agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 claims description 33
- 239000002184 metal Substances 0.000 claims description 33
- 229910000805 Pig iron Inorganic materials 0.000 claims description 32
- 239000003795 chemical substances by application Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 25
- 238000002203 pretreatment Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 description 29
- 238000011282 treatment Methods 0.000 description 7
- 239000002518 antifoaming agent Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000011269 treatment regimen Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- 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
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
-
- 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
- C21C1/06—Constructional features of mixers for pig-iron
-
- 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
- C21C5/36—Processes yielding slags of special composition
- C21C2005/366—Foam slags
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
産業上の利用分野
この発明は高炉から出銑した溶銑の予備処理方
法に係り、特に受銑過程でスラグフオーミングを
防止しつつ溶銑予備処理を行なう方法に関する。
従来技術とその問題点
高炉から出銑した溶銑の成分組成は転炉等の製
鋼工程における精錬能率や鋼の品質に大きく影響
するため、溶銑の成分組成や生産鋼種に応じて脱
珪、脱燐、脱硫等の溶銑予備処理が行なわれるこ
とは周知のとおりである。
この溶銑予備処理は種々の方法で行なわれる
が、この予備処理においても製鋼プロセスで見ら
れるものと同様のスラグフオーミング（スラグ融
体の泡立ち現象）が発生する。このスラグフオー
ミングは溶銑の脱珪処理において顕著に発生す
る。スラグフオーミングは溶銑の成分等は大きな
影響を与えないため、軽度のスラグフオーミング
は特に問題とはならない。しかし、激しいスラグ
フオーミングはスラグが反応容器から逸出して、
鉄歩留りの低下や作業性悪化の原因となつたり、
逸出しない場合でも操業を困難にする場合がある
ため、溶銑の予備処理においてもスラグフオーミ
ングを可及的に防止することが必要である。
従来の溶銑予備処理時におけるスラグフオーミ
ングの防止方法としては、例えば溶銑中に消泡剤
（金属アルミニウム、粉コークス、もみがら等）
を添加する方法が知られている（特開昭57−
104604）。この方法はスラグの泡と消泡剤とを反
応させてスラグの泡立ちを鎮静化する方法であ
り、特に溶銑の脱珪処理に有効とされている。し
かしながら、この方法は当然のことながら溶銑予
備処理剤とは別に金属アルミニウム等の消泡剤を
用意しなければならない上、清泡剤を投入する設
備等を必要とするため、経済的な方法とは言い得
ない。
発明の目的
この発明は従来の前記問題にかんがみなされた
もので、消泡剤を用いずにスラグフオーミングを
防止し、効率的かつ安定した溶銑予備処理を実施
し得る方法を提案することを目的とするものであ
る。
発明の構成
この発明に係る溶銑の予備処理方法は、高炉か
ら出銑した溶銑をトーピード等の反応容器に受銑
する際に、受銑量が目標受銑量の50％を超え80％
未満に達するまでに受銑速度に応じて溶銑予備処
理剤の必要量全量を添加し、引続き溶銑予備処理
剤を添加することなく残りを受銑することを特徴
とることなく残りの受銑量を受銑することを特徴
とするものである。
以下、この発明方法について脱珪処理を例にと
り詳細に説明する。
溶銑の脱珪処理におけるスラグフオーミング
は、溶銑中のＣは脱珪剤中の酸素と反応しCOガ
スとなることにより発生するもので、この反応は
脱珪剤投入完了後も続く。この発明者らは、上記
脱珪処理におけるスラグフオーミングの防止方法
を見い出すべく、脱珪剤投入速度を種々変えてス
ラグフオーミングの発生状況を調べた。
第１図はその時の受銑パターンを示す。すなわ
ち、は溶銑を脱珪処理なしに受銑した場愛のパ
ターン、はほぼ均一の投入速度で脱珪剤を投入
する場合のパターン、はパターンよりさらに
投入速度を増して脱珪剤を投入する場合のパター
ンをそれぞれ示す。
すなわち、脱珪処理パターンの場合、受銑終
了近くにおいても脱珪剤を投入するため、スラグ
フオーミングにより容器からスラグが逸出した
り、受銑量が低下する。パターンでは脱珪剤投
入速度が大きいため、スラグフオーミングが激し
く起こり、パターン以上のスラグ逸出が起きた
り、受銑量が大幅に低下する。
そこでこの発明者らは、所定の受銑時間内でス
ラグフオーミングを防止しつつ脱珪処理する方法
について種々検討した結果、第１図のパターン
が効果的であることを見い出した。すなわち、パ
ターンは受銑量が目標受銑量に対しある一定量
Ｐに達するまでに脱珪剤の全量を投入し、以後は
脱珪剤を投入することなく残りの受銑量を受銑す
る場合のパターンである。このパターンの場合、
脱珪剤投入を完了する受銑量Ｐが少な過ぎると当
然脱珪剤投入速度が大きくなりスラグフオーミン
グが激しくなる。また、受銑量Ｐが多過ぎると溶
湯レベルが高くなりフリーボードが短くなるため
スラグの逸出が起こる。そのため脱珪剤投入を完
了する受銑量Ｐは目標受銑量の50％を超え80％未
満とする。すなわち、受銑量Ｐが目標受銑量の50
％以下では、前記したとおり激しくスラグフオー
ミングが起こり好ましくなく、また、受銑量Ｐが
目標受銑量の80％以上になるとフリーボードが短
くなつてスラグフオーミングによりスラグの逸出
が起こるためである。
第２図はこの発明方法を実施するための装置構
成例を示す概略図で、１は出銑樋、２はトーピー
ド、３は脱珪剤タンク、４はロータリーフイーダ
ー、５は脱珪剤気体輸送管、６は脱珪剤切出し制
御装置、７は重量計、８は溶銑をそれぞれ示す。
すなわち、脱珪剤はロータリーフイーダー４に
より切出され、気体輸送管５内をキヤリアガスに
て気体輸送されて出銑樋１終端部の溶銑８に添加
される。添加された脱珪剤は溶銑と共にトーピー
ド２へ落下し、溶銑の落下エネルギーによつて生
ずる撹拌流に捲き込まれて脱珪処理が行なわれ
る。この発明では、トーピード２に設置された重
量計７により測定される受銑量および受銑速度
と、予め脱珪剤切出し制御装置６に入力されてい
るトーピード空車情報（残銑量、成分等）、出銑
Si予想値、目標受銑量、処理後Si目標、脱Si原単
位とから、ロータリーフイーダー４の回転数を制
御して脱珪剤の切出し制御が行なわれ、所定の受
銑量Ｐに達するまでに脱珪剤の必要量を全量を投
入し、投入完了後は脱珪剤を投入することなく残
りの受銑量を受銑して脱珪処理完了となる。
実施例
第２図に示すシステムを用い、250トントーピ
ードにおいて、高炉から出銑された溶銑を第１表
に示す操業条件で脱珪処理した結果を従来法（第
１図パターン）と比較して第２表に示す。
INDUSTRIAL APPLICATION FIELD This invention relates to a method for pre-treating hot metal tapped from a blast furnace, and more particularly to a method for pre-treating hot metal while preventing slag forming during the pig iron receiving process. Conventional technology and its problems The composition of hot metal tapped from a blast furnace greatly affects the refining efficiency and quality of steel in steelmaking processes such as converters. It is well known that hot metal pretreatment such as desulfurization is carried out. This hot metal pretreatment is carried out by various methods, but slag forming (a bubbling phenomenon of molten slag) similar to that seen in the steelmaking process occurs in this pretreatment as well. This slag forming occurs significantly during desiliconization treatment of hot metal. Since the components of hot metal do not have a large effect on slag forming, mild slag forming does not pose a particular problem. However, severe slag forming causes slag to escape from the reaction vessel.
It may cause a decrease in iron yield and deterioration of workability.
Even if slag forming does not escape, it may make operations difficult, so it is necessary to prevent slag forming as much as possible in the preliminary treatment of hot metal. Conventional methods for preventing slag forming during hot metal pretreatment include adding antifoaming agents (aluminum metal, coke powder, rice husk, etc.) to the hot metal.
A method of adding
104604). This method is a method of suppressing foaming of slag by reacting foam of slag with an antifoaming agent, and is said to be particularly effective for desiliconization treatment of hot metal. However, this method is not an economical method because it is necessary to prepare an antifoaming agent such as metal aluminum in addition to the hot metal pretreatment agent, and it also requires equipment for introducing the antifoaming agent. I can't say. Purpose of the Invention The present invention was made in view of the above-mentioned conventional problems, and its purpose is to propose a method that can prevent slag forming without using an antifoaming agent and carry out efficient and stable pretreatment of hot metal. That is. Composition of the Invention The method for pre-treatment of hot metal according to the present invention is such that when hot metal tapped from a blast furnace is received into a reaction vessel such as a torpedo, the amount of received pig iron exceeds 50% of the target amount of pig iron received and 80% of the target amount of pig iron is received.
Add the entire required amount of hot metal pre-treatment agent according to the pig iron receiving speed until reaching less than It is characterized by receiving pig iron. Hereinafter, the method of the present invention will be explained in detail by taking desiliconization treatment as an example. Slag forming in the desiliconization treatment of hot metal occurs when C in the hot metal reacts with oxygen in the desiliconizing agent to form CO gas, and this reaction continues even after the addition of the desiliconizing agent is completed. In order to find a method for preventing slag forming in the desiliconization process, the inventors investigated the occurrence of slag forming while varying the rate of injecting the desiliconizing agent. Figure 1 shows the pig iron receiving pattern at that time. In other words, 1 is the pattern when hot metal is received without desiliconization treatment, 1 is the pattern when the desiliconizing agent is introduced at an almost uniform rate, and 1 is the pattern when the desiliconizing agent is introduced at a rate that is even higher than the pattern. The patterns for each case are shown below. That is, in the case of the desiliconization treatment pattern, since the desiliconization agent is added even near the end of pig iron receiving, slag escapes from the container due to slag forming and the amount of pig iron received decreases. Because the desiliconizing agent injection speed is high in the pattern, slag forming occurs violently, causing more slag to escape than in the pattern and significantly reducing the amount of pig iron received. Therefore, the inventors have investigated various methods for desiliconization while preventing slag forming within a predetermined pig iron receiving time, and have found that the pattern shown in FIG. 1 is effective. In other words, the pattern is to inject the entire amount of desiliconizing agent until the amount of pig iron received reaches a certain amount P relative to the target amount of pig iron received, and thereafter receive the remaining amount of pig iron without adding any desiliconizing agent. This is the case pattern. For this pattern,
If the amount P of received pig iron that completes the addition of the desiliconization agent is too small, the rate of introduction of the desiliconization agent will naturally increase, resulting in severe slag forming. Moreover, if the amount of pig iron received is too large, the molten metal level becomes high and the free board becomes short, causing slag escape. Therefore, the amount of pig iron to be received after adding the desiliconizing agent is set to be more than 50% and less than 80% of the target amount of pig iron to be received. In other words, the amount of pig iron received is 50% of the target amount of pig iron received.
% or less, as mentioned above, severe slag forming occurs, which is undesirable, and if the received pig iron amount P exceeds 80% of the target pig iron received amount, the free board becomes short and slag escapes due to slag forming. It is. FIG. 2 is a schematic diagram showing an example of the configuration of an apparatus for carrying out the method of the present invention, in which 1 is a tap sluice, 2 is a torpedo, 3 is a desiliconizing agent tank, 4 is a rotary feeder, and 5 is a desiliconizing agent gas. A transport pipe, 6 a desiliconizing agent cutting control device, 7 a weighing scale, and 8 hot metal, respectively. That is, the desiliconizing agent is cut out by the rotary leaf feeder 4, transported in gas by the carrier gas in the gas transport pipe 5, and added to the hot metal 8 at the end of the tap hole 1. The added desiliconizing agent falls into the torpedo 2 together with the hot metal, and is drawn into the stirring flow generated by the falling energy of the hot metal to perform the desiliconization process. In this invention, the amount of received pig iron and the rate of received pig iron measured by the weight scale 7 installed in the torpedo 2, and the torpedo empty car information (residual pig iron amount, components, etc.) input into the desiliconizing agent cutting control device 6 in advance. , tapping
Based on the S i expected value, the target amount of pig iron received, the S i target after treatment, and the removal S i basic unit, the rotation speed of the rotary leaf feeder 4 is controlled to control the removal of the desiliconizing agent, and the predetermined amount of pig iron received is achieved. By the time P is reached, the entire required amount of desiliconizing agent is added, and after the charging is completed, the remaining amount of pig iron is received without adding any desiliconizing agent, and the desiliconizing process is completed. Example Using the system shown in Figure 2, hot metal tapped from a blast furnace was desiliconized in a 250-ton torpedo under the operating conditions shown in Table 1.The results were compared with the conventional method (pattern in Figure 1). Shown in Table 2.
【表】【table】
【表】
σ：標準偏差値
第２表に示す結果より明らかなごとく、この発
明法では受銑量が低下することなく、脱珪処理が
完了し、スラグフオーミングの発生は少なく、脱
Si量および歩留り共に良好な値を示した。
発明の効果
以上説明したごとく、この発明方法によれば、
予備処理剤投入速度を制御することにより、消泡
剤等を用いることなくスラグフオーミングを抑制
することができるので、経済的であるのみならず
効率的かつ安定した溶銑予備処理が可能となり、
次の製鋼工程に大なる効果を奏するものである。[Table] σ: Standard deviation value
As is clear from the results shown in Table 2, with this invention method, the desiliconization process is completed without reducing the amount of pig iron received, the occurrence of slag forming is small, and the desiliconization process is
Both Si amount and yield showed good values. Effects of the invention As explained above, according to the method of the invention,
By controlling the pretreatment agent input speed, slag forming can be suppressed without using antifoaming agents, etc., so hot metal pretreatment is not only economical but also efficient and stable.
This has a great effect on the next steelmaking process.
第１図は溶銑脱珪処理パターン例を示す図、第
２図はこの発明方法を実施するための装置構成例
を示す概略図である。
１……出銑樋、２……トーピード、３……脱珪
剤タンク、４……ロータリーフイーダー、５……
脱珪剤気体輸送管、６……脱珪剤切出し制御装
置、７……重量計、８……溶銑。
FIG. 1 is a diagram showing an example of a hot metal desiliconization treatment pattern, and FIG. 2 is a schematic diagram showing an example of the configuration of an apparatus for carrying out the method of the present invention. 1... Tapping trough, 2... Torpedo, 3... Silica removal tank, 4... Rotary feeder, 5...
Desiliconizing agent gas transport pipe, 6... Desiliconizing agent cutting control device, 7... Weighing scale, 8... Hot metal.
Claims (1)
予備処理を行う方法において、受銑量が目標受銑
量の50％を超え80％未満に達するまでに受銑速度
に応じて溶銑予備処理剤の必要量全量を添加し、
引続き溶銑予備処理剤を添加することなく残りを
受銑することを特徴とする溶銑の予備処理方法。1 In a method of pre-treating hot metal by adding a pre-treatment agent during the blast furnace receiving process, the hot metal reserve is added according to the receiving rate until the amount of received pig iron reaches more than 50% and less than 80% of the target pig iron receiving amount. Add the entire required amount of processing agent,
A hot metal pretreatment method characterized in that the remaining pig iron is received without subsequently adding a hot metal pretreatment agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15166485A JPS6213509A (en) | 1985-07-09 | 1985-07-09 | Preliminary treatment of molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15166485A JPS6213509A (en) | 1985-07-09 | 1985-07-09 | Preliminary treatment of molten iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6213509A JPS6213509A (en) | 1987-01-22 |
| JPH0475281B2 true JPH0475281B2 (en) | 1992-11-30 |
Family
ID=15523527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15166485A Granted JPS6213509A (en) | 1985-07-09 | 1985-07-09 | Preliminary treatment of molten iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6213509A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100399227B1 (en) * | 1999-10-30 | 2003-09-22 | 주식회사 포스코 | Controlling method of weighting machine in tlc for transporting molten material discharged from blast furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6056008A (en) * | 1983-09-07 | 1985-04-01 | Sumitomo Metal Ind Ltd | Drying method of desiliconizing agent |
-
1985
- 1985-07-09 JP JP15166485A patent/JPS6213509A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6056008A (en) * | 1983-09-07 | 1985-04-01 | Sumitomo Metal Ind Ltd | Drying method of desiliconizing agent |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6213509A (en) | 1987-01-22 |
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