JP2002226906A - Pre-treating method for molten iron by using oil- contained sludge - Google Patents
Pre-treating method for molten iron by using oil- contained sludgeInfo
- Publication number
- JP2002226906A JP2002226906A JP2001025822A JP2001025822A JP2002226906A JP 2002226906 A JP2002226906 A JP 2002226906A JP 2001025822 A JP2001025822 A JP 2001025822A JP 2001025822 A JP2001025822 A JP 2001025822A JP 2002226906 A JP2002226906 A JP 2002226906A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- hot metal
- containing sludge
- mass
- sludge
- 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.)
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Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Landscapes
- Treatment Of Sludge (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は含油スラッジを有効
に利用できる溶銑の予備処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pretreating hot metal which can effectively utilize oil-containing sludge.
【０００２】[0002]
【従来の技術】製鉄プロセスのうち、連続鋳造工程、分
塊工程、圧延工程（熱間圧延工程など）などでは鉄を冷
却するために多量の冷却廃水が発生している。この冷却
廃水には多量の鉄分が含まれており、粒径の大きな鉄分
は沈降処理によってミルスケールとして分離され、粒径
の小さな鉄分はフィルターなどによってスラッジとして
捕集されている。スラッジ中の鉄分は、製銑・製鋼の副
原料として有効利用することが望まれており、例えば、
溶銑予備処理工程で鉄原料又は精錬剤（脱珪剤、脱燐剤
など）として使用することが研究されている。しかしス
ラッジは水分を多く含有しているため、流動性が低く搬
送が困難である。2. Description of the Related Art Among iron making processes, a large amount of cooling wastewater is generated in a continuous casting step, a sizing step, a rolling step (a hot rolling step, etc.) for cooling iron. This cooling wastewater contains a large amount of iron, and iron having a large particle diameter is separated as a mill scale by sedimentation treatment, and iron having a small particle diameter is collected as sludge by a filter or the like. Iron in the sludge is desired to be effectively used as an auxiliary material for pig iron and steel making, for example,
The use of iron as a raw material or a refining agent (such as a desiliconizing agent or a dephosphorizing agent) in a hot metal pretreatment process has been studied. However, since sludge contains a large amount of water, it has low fluidity and is difficult to transport.
【０００３】スラッジの搬送性を高めるため、特公昭５
５−１１７２８号公報、特開平１０−１９２８９４号公
報、特公昭５５−５１４９２号公報、特開平９−３１６
５１３号公報などには、スラッジと他の成分（ベントナ
イト、転炉ダスト、生石灰、バインダなど）とを混合す
る方法が開示されている。しかし、スラッジは水分の
他、圧延機等の潤滑油に由来する油も含有している。前
記方法ではスラッジ中の油が低減されておらず、溶銑予
備処理操作で油が不完全燃焼し、煤や煙が発生して作業
環境が悪化する虞がある。また煤によって集塵装置のバ
グフィルターが目詰まりを起す。[0003] In order to improve the transportability of sludge,
JP-A-5-11728, JP-A-10-192894, JP-B-55-51492, JP-A-9-316
No. 513 discloses a method of mixing sludge with other components (bentonite, converter dust, quicklime, binder, etc.). However, sludge contains not only moisture but also oil derived from lubricating oil such as a rolling mill. In the above method, the oil in the sludge is not reduced, and the oil may be incompletely burned in the hot metal pretreatment operation, soot and smoke may be generated, and the working environment may be deteriorated. The soot causes the bag filter of the dust collector to be clogged.
【０００４】一方、特開平３−７９７１１号公報には、
水分量が１％以下になるまで含油スラッジを乾燥した
後、溶銑に添加する方法が開示されている。しかし、含
油スラッジは水と油とを含んでいるため、乾燥そのもの
が容易ではなく、水分を１％以下になるまで乾燥しても
油は５％程度残存する。そのため油の不完全燃焼が生じ
る虞がある。On the other hand, Japanese Patent Application Laid-Open No. 3-79711 discloses that
A method is disclosed in which oil-containing sludge is dried until the water content becomes 1% or less and then added to hot metal. However, since the oil-containing sludge contains water and oil, it is not easy to dry itself. Even if the water is dried until the water content becomes 1% or less, about 5% of the oil remains. Therefore, incomplete combustion of oil may occur.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記の様な事
情に着目してなされたものであって、その目的は油の不
完全燃焼を確実に防止できる溶銑予備処理方法を提供す
ることにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hot metal pretreatment method capable of reliably preventing incomplete combustion of oil. is there.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成し得た本
発明の溶銑予備処理方法とは、溶銑に含油スラッジを加
えて溶銑予備処理する方法であって、下記式（１ａ）を
満たす条件で操業して含油スラッジ中の油の不完全燃焼
を防止する点に要旨を有するものである。The hot metal pretreatment method of the present invention, which has achieved the above object, is a method of adding oil-containing sludge to hot metal to perform hot metal pretreatment, and the condition satisfying the following formula (1a) is satisfied. To prevent incomplete combustion of the oil in the oil-containing sludge.
【０００７】 Ｈ≧６５００−５×Ｔ＋４００×Ｑｓ×Ｎ＋１００００×Ｑｇ …（１ａ） ［式中、Ｈは溶銑湯面から含油スラッジ供給口までの距
離（ｍｍ）を示し、Ｔは溶銑の温度（℃）を示し、Ｑｓ
は含油スラッジの供給速度（ｋｇ／分・溶銑トン）を示
し、Ｎは含油スラッジ中の油の含有量（質量％）を示
し、Ｑｇは含油スラッジを輸送するためのキャリアガス
の流量（Ｎｍ3／分・溶銑トン）を示す］ 前記操業において、湯面から含油スラッジ供給口までの
距離Ｈは３００〜２０００ｍｍ程度、溶銑温度Ｔは１２
５０〜１５００℃程度、含油スラッジの供給速度Ｑｓは
０．０２〜３ｋｇ／分・溶銑トン程度、含油スラッジ中
の油の含有量Ｎは０〜３０質量％程度、キャリアガス流
量Ｑｇは０．０１〜０．３Ｎｍ3／分・溶銑トン程度で
ある。前記含油スラッジは、吸水性を有しかつ含油スラ
ッジと混合したときに発熱する物質（ＣａＯ含有化合物
など）と予め混合した後、溶銑に加えるのが望ましい。H ≧ 6500−5 × T + 400 × Qs × N + 10000 × Qg (1a) [wherein H represents the distance (mm) from the hot metal surface to the oil-containing sludge supply port, and T represents the temperature of the hot metal (° C.) ) And Qs
Indicates the feed rate of the oil-containing sludge (kg / min. Tons of hot metal), N indicates the oil content (% by mass) in the oil-containing sludge, and Qg indicates the flow rate (Nm 3) of the carrier gas for transporting the oil-containing sludge. In the above operation, the distance H from the molten metal surface to the oil-containing sludge supply port is about 300 to 2000 mm, and the hot metal temperature T is 12
The oil-containing sludge feed rate Qs is about 0.02 to 3 kg / min. Tons of hot metal, the oil content N in the oil-containing sludge is about 0 to 30% by mass, and the carrier gas flow rate Qg is about 0.01 to 30% by mass. About 0.3 Nm 3 / min · ton of hot metal. The oil-containing sludge is desirably added to hot metal after being previously mixed with a substance (such as a CaO-containing compound) that has water absorbency and generates heat when mixed with the oil-containing sludge.
【０００８】[0008]
【発明の実施の形態】本発明者らは、不完全燃焼に大き
な影響を与える因子として、湯面から含油スラッジ供給
口までの距離Ｈ、溶銑温度Ｔ、含油スラッジの供給速度
Ｑs、含油スラッジ中の油の含有量Ｎ、及び含油スラッ
ジを輸送するためのキャリアガスの流量Ｑｇに着目し
た。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have found that factors that greatly affect incomplete combustion include the distance H from the molten metal surface to the oil-impregnated sludge supply port, the hot metal temperature T, the oil-impregnated sludge supply rate Qs, and the oil-impregnated sludge. And the flow rate Qg of the carrier gas for transporting the oil-containing sludge.
【０００９】含油スラッジの供給口までの距離Ｈに着目
した理由は、前記距離Ｈが高い程、供給口から放出され
た含油スラッジが溶銑に到達するまでの時間（滞留時
間）を長くできるためである。すなわち、滞留時間内に
含油スラッジを十分に加熱でき、含油スラッジの油の燃
焼を助けることができる。溶銑温度Ｔに着目した理由
は、溶銑温度Ｔが高い程、油の燃焼反応を加速でき、不
完全燃焼を防止できるためである。含油スラッジの供給
速度Ｑs及び油含有量Ｎに着目したのは、供給速度が遅
い程、また油の含有量が少ない程、溶銑に供給される油
の量を低減でき、不完全燃焼を防止できるからである。
キャリアガスの流量Ｑｇに着目したのは、Ｑｇが遅い程
含油スラッジの滞留時間を長くでき、含油スラッジを十
分に加熱できるからである。The reason for paying attention to the distance H to the supply port of the oil-containing sludge is that the longer the distance H is, the longer the time required for the oil-containing sludge discharged from the supply port to reach the hot metal (residence time). is there. That is, the oil-containing sludge can be sufficiently heated within the residence time, and the oil-containing sludge can be assisted in burning the oil. The reason for paying attention to the hot metal temperature T is that the higher the hot metal temperature T, the more the oil combustion reaction can be accelerated and the more incomplete combustion can be prevented. Focusing on the supply rate Qs and oil content N of the oil-containing sludge, the lower the supply rate and the lower the oil content, the more the amount of oil supplied to the hot metal can be reduced, and incomplete combustion can be prevented. Because.
The reason for focusing on the flow rate Qg of the carrier gas is that the slower the Qg, the longer the residence time of the oil-containing sludge and the more sufficiently the oil-containing sludge can be heated.
【００１０】すなわち距離Ｈ及び溶銑温度Ｔについて
は、数値が大きいほど不完全燃焼を防止でき、含油スラ
ッジの供給速度Ｑs、含油スラッジ中の油の含有量Ｎ、
及びキャリアガスの流量Ｑｇについては、反対に数値が
小さいほど不完全燃焼を防止できると考えられる。そし
て種々検討を重ねた結果、下記式（１）［または、この
式（１）を変形した下記式（１ａ）］を満たす条件で操
業すると不完全燃焼を確実に防止できることを見出し、
本発明を完成した。すなわち従来は、Ｈ、Ｔ、Ｑｓ、
Ｎ、Ｑｇを関連付けていないため不完全燃焼を防止でき
なかったのに対し、本発明ではＨ、Ｔ、Ｑｓ、Ｎ、Ｑｇ
を特定の関係で関連付けたため不完全燃焼を確実に防止
できるのである。That is, with regard to the distance H and the hot metal temperature T, the larger the numerical values, the more the incomplete combustion can be prevented, and the supply rate Qs of the oil-containing sludge, the oil content N in the oil-containing sludge,
Conversely, with respect to the flow rate Qg of the carrier gas, it is considered that the smaller the numerical value is, the more the incomplete combustion can be prevented. As a result of various studies, it was found that incomplete combustion can be reliably prevented by operating under the conditions satisfying the following equation (1) [or the following equation (1a) obtained by modifying the equation (1)].
The present invention has been completed. That is, conventionally, H, T, Qs,
While incomplete combustion could not be prevented because N and Qg were not associated, in the present invention, H, T, Qs, N, Qg
Are related in a specific relationship, so that incomplete combustion can be reliably prevented.
【００１１】 Ｈ＋５×Ｔ−４００×Ｑｓ×Ｎ−１００００×Ｑｇ≧６５００ …（１） Ｈ≧６５００−５×Ｔ＋４００×Ｑｓ×Ｎ＋１００００×Ｑｇ …（１ａ） ［式中、Ｈは溶銑湯面から含油スラッジ供給口までの距
離（ｍｍ）を示し、Ｔは溶銑の温度（℃）を示し、Ｑｓ
は含油スラッジの供給速度（ｋｇ／分・溶銑トン）を示
し、Ｎは含油スラッジ中の油の含有量（質量％）を示
し、Ｑｇは含油スラッジを輸送するためのキャリアガス
の流量（Ｎｍ3／分・溶銑トン）を示す］ 上記式（１）又は（１ａ）を満たす条件で操業するため
には、各パラメーターを適当な範囲で制御すればよい。
例えば、制御が容易なパラメータ（湯面から含油スラッ
ジ供給口までの距離Ｈ、キャリアガスの流量Ｑｇなど）
を適切な範囲に調整することにより、簡便に上記式
（１）又は（１ａ）を満たす条件で操業できる。H + 5 × T−400 × Qs × N-10000 × Qg ≧ 6500 (1) H ≧ 6500−5 × T + 400 × Qs × N + 10000 × Qg (1a) [where H is oil impregnated from the surface of the hot metal The distance (mm) to the sludge supply port is indicated, T indicates the temperature (° C.) of the hot metal, and Qs
Indicates the feed rate of the oil-containing sludge (kg / min. Tons of hot metal), N indicates the oil content (% by mass) in the oil-containing sludge, and Qg indicates the flow rate (Nm 3) of the carrier gas for transporting the oil-containing sludge. / Minute / hot metal ton)] In order to operate under the condition satisfying the above formula (1) or (1a), each parameter may be controlled within an appropriate range.
For example, parameters that are easy to control (distance H from oil level to oil-containing sludge supply port, carrier gas flow rate Qg, etc.)
Is adjusted to an appropriate range, the operation can be easily performed under the condition satisfying the above formula (1) or (1a).
【００１２】距離Ｈを調整する場合、上記式（１ａ）が
利用できる。すなわち、供給する含油スラッジ中の油含
有量Ｎと溶銑の温度Ｔを測定し、含油スラッジの供給速
度Ｑｓ及びキャリアガスの流量Ｑｇを設定すれば、含油
スラッジの供給口の距離は上記式（１）によって簡単に
設定できる。When adjusting the distance H, the above equation (1a) can be used. That is, the oil content N in the supplied oil-containing sludge and the temperature T of the hot metal are measured, and the supply speed Qs of the oil-containing sludge and the flow rate Qg of the carrier gas are set. ) Can be easily set.
【００１３】湯面から含油スラッジ供給口までの距離Ｈ
は、例えば、１００ｍｍ以上、好ましくは２００ｍｍ以
上、さらに好ましくは３００ｍｍ以上である。なお距離
Ｈが大きすぎると、溶銑予備処理効果（脱リン効果な
ど）が低下する虞がある。そのため供給口の距離Ｈは、
例えば、３０００ｍｍ以下程度、好ましくは２５００ｍ
ｍ以下程度、さらに好ましくは２０００ｍｍ以下程度で
ある。Distance H from the surface of the molten metal to the oil-containing sludge supply port
Is, for example, 100 mm or more, preferably 200 mm or more, and more preferably 300 mm or more. If the distance H is too large, the effect of the hot metal pretreatment (such as the dephosphorization effect) may be reduced. Therefore, the distance H of the supply port is
For example, about 3000 mm or less, preferably 2500 m
m or less, more preferably about 2000 mm or less.
【００１４】キャリアガスの流量Ｑｇを調整する場合、
前記式（１）を変形した下記式（１ｂ）が利用できる。
すなわち、供給する含油スラッジ中の油含有量Ｎと溶銑
の温度Ｔを測定し、湯面から含油スラッジ供給口までの
距離Ｈ及び含油スラッジの供給速度Ｑｓを設定すれば、
キャリアガスの流量Ｑｇは下記式（１ｂ）によって簡単
に設定できる。When adjusting the flow rate Qg of the carrier gas,
The following equation (1b) obtained by modifying the equation (1) can be used.
That is, if the oil content N in the supplied oil-containing sludge and the temperature T of the hot metal are measured, and the distance H from the molten metal surface to the oil-containing sludge supply port and the supply rate Qs of the oil-containing sludge are set,
The flow rate Qg of the carrier gas can be easily set by the following equation (1b).
【００１５】 Ｑｇ≦−０．６５＋０．０００１×Ｈ＋０．０００５×Ｔ−０．０４×Ｑｓ× Ｎ …（１ｂ） ［式中、Ｑｇ、Ｈ、Ｔ、Ｑｓ及びＮは前記に同じ］ キャリアガスの流量Ｑｇは、例えば、０．５Ｎｍ3／分
・溶銑トン以下、好ましくは０．４Ｎｍ3／分・溶銑ト
ン以下、さらに好ましくは０．３Ｎｍ3／分・溶銑トン
以下である。なおキャリアガスの流量Ｑｇが小さ過ぎる
と、溶銑予備処理（脱リン処理など）に要する時間が長
くなる虞がある。またスラッジの供給速度Ｑｓが低下し
てしまう虞もある。そのためキャリアガスの流量Ｑｇ
は、例えば、０．００１Ｎｍ3／分・溶銑トン以上、好
ましくは０．００５Ｎｍ3／分・溶銑トン以上、さらに
好ましくは０．０１Ｎｍ3／分・溶銑トン以上である。Qg ≦ −0.65 + 0.0001 × H + 0.0005 × T−0.04 × Qs × N (1b) wherein Qg, H, T, Qs and N are the same as above. The flow rate Qg is, for example, 0.5 Nm 3 / min · ton of hot metal or less, preferably 0.4 Nm 3 / min · ton of hot metal or less, more preferably 0.3 Nm 3 / min · ton of hot metal or less. If the flow rate Qg of the carrier gas is too small, the time required for the hot metal pre-treatment (such as the dephosphorization treatment) may be long. Further, there is a possibility that the sludge supply speed Qs may be reduced. Therefore, the flow rate Qg of the carrier gas
Is, for example, at least 0.001 Nm 3 / min · ton of hot metal, preferably at least 0.005 Nm 3 / min · ton of hot metal, more preferably at least 0.01 Nm 3 / min · ton of hot metal.
【００１６】距離Ｈ、及びキャリアガスの流量Ｑｓ以外
のパラメーター（溶銑温度Ｔ、含油スラッジの供給速度
Ｑｓ、含油スラッジ中の油の含有量Ｎなど）は、通常、
下記の範囲内である。Parameters other than the distance H and the flow rate Qs of the carrier gas (hot metal temperature T, the supply speed Qs of the oil-containing sludge, the oil content N in the oil-containing sludge, etc.) are usually
It is within the following range.
【００１７】（１）溶銑温度Ｔ 溶銑温度Ｔは、例えば、１２００〜１５５０℃程度、好
ましくは１２３０〜１５２０℃程度、さらに好ましくは
１２５０〜１５００℃程度である。(1) Hot Metal Temperature T Hot metal temperature T is, for example, about 1200 to 1550 ° C., preferably about 1230 to 1520 ° C., and more preferably about 1250 to 1500 ° C.
【００１８】（２）含油スラッジの供給速度Ｑｓ 含油スラッジの供給速度Ｑｓは、例えば、０．００５〜
４ｋｇ／分・溶銑トン程度、好ましくは０．０１〜３．
５ｋｇ／分・溶銑トン程度、さらに好ましくは０．０２
〜３ｋｇ／分・溶銑トン程度である。なお、本発明では
特定の条件下で操業するため、含油スラッジの供給速度
が大きくても不完全燃焼を防止できる。そのため含油ス
ラッジの供給速度は、例えば、１ｋｇ／分・溶銑トン程
度以上、好ましくは３ｋｇ／分・溶銑トン以上、さらに
好ましくは５ｋｇ／分・溶銑トン以上であってもよい。(2) Supply Speed Qs of Oil-Containing Sludge The supply speed Qs of oil-containing sludge is, for example, 0.005 to 0.005.
About 4 kg / min / ton of hot metal, preferably 0.01-3.
About 5 kg / min. Ton of hot metal, more preferably 0.02
３3 kg / min. In the present invention, since operation is performed under specific conditions, incomplete combustion can be prevented even when the supply rate of the oil-containing sludge is high. Therefore, the feed rate of the oil-containing sludge may be, for example, about 1 kg / min · ton of hot metal, preferably 3 kg / min · ton of hot metal, and more preferably 5 kg / min · ton of hot metal.
【００１９】（３）含油スラッジ中の油の含有量Ｎ 油の含有量Ｎは、例えば、０．１〜３０質量％程度、好
ましくは０．１〜２０質量％程度、さらに好ましくは
０．１〜１０質量％程度である。なお、本発明では、特
定の条件下で操業するため、油の含有量が高くても不完
全燃焼を防止できる。そのため油の含有量は、例えば、
１質量％以上、好ましくは５質量％以上、さらに好まし
くは１０質量％以上であってもよい。(3) Oil Content N in Oil-Containing Sludge The oil content N is, for example, about 0.1 to 30% by mass, preferably about 0.1 to 20% by mass, and more preferably about 0.1 to 20% by mass. About 10 to 10% by mass. In the present invention, since operation is performed under specific conditions, incomplete combustion can be prevented even if the oil content is high. Therefore, the oil content is, for example,
It may be 1% by mass or more, preferably 5% by mass or more, more preferably 10% by mass or more.
【００２０】前記溶銑予備処理方法において、気体酸
素、固体酸素（鉄鉱石、鉄くずなどの酸化鉄を含む固体
成分など）などの酸素の供給方法は特に限定されず、気
体酸素及び固体酸素の両方を供給してもよく、片方だけ
を供給してもよい。本発明は固体酸素だけを供給する方
法に有利に適用できる。固体酸素だけを供給する場合、
気体酸素を供給する場合に比べて不完全燃焼の防止が困
難であるにも拘わらず、本発明によれば特定の条件下で
操業するため、固体酸素だけを供給しても不完全燃焼を
防止できる。In the hot metal pretreatment method, the method of supplying oxygen such as gaseous oxygen and solid oxygen (solid components including iron oxide such as iron ore and scrap iron) is not particularly limited. May be supplied, or only one of them may be supplied. The present invention can be advantageously applied to a method for supplying only solid oxygen. When supplying only solid oxygen,
In spite of the fact that it is difficult to prevent incomplete combustion as compared with the case of supplying gaseous oxygen, according to the present invention, since operation is performed under specific conditions, incomplete combustion is prevented even when only solid oxygen is supplied. it can.
【００２１】本発明で使用する含油スラッジの由来は特
に制限されず、鉄鋼製品の製造工程［連続鋳造工程、分
塊工程、圧延工程（熱間圧延工程など）］で発生する種
々の含油スラッジが使用できる。The origin of the oil-impregnated sludge used in the present invention is not particularly limited, and various oil-impregnated sludges generated in a steel product manufacturing process [continuous casting process, sizing process, rolling process (hot rolling process, etc.)] may be used. Can be used.
【００２２】含油スラッジの水の含有量は、例えば、１
〜６０質量％程度、好ましくは３〜５０質量％程度、さ
らに好ましくは５〜４０質量％程度である。The water content of the oil-containing sludge is, for example, 1
About 60% by mass, preferably about 3 to 50% by mass, and more preferably about 5 to 40% by mass.
【００２３】含油スラッジにおいて、水及び油以外の残
部は実質的に鉄分（鉄、酸化鉄など）である。鉄分の含
有量（Ｔ．Ｆｅ）は、通常、１０〜９９質量％程度、好
ましくは２０〜９０質量％程度、さらに好ましくは２５
〜８０質量％程度である。また、水及び油以外の残部
（鉄分など）のうち酸化鉄の割合は、通常、１０質量％
以上、好ましくは２０質量％以上、さらに好ましくは３
０質量％以上である。In the oil-containing sludge, the balance other than water and oil is substantially iron (iron, iron oxide, etc.). The iron content (T.Fe) is usually about 10 to 99% by mass, preferably about 20 to 90% by mass, and more preferably 25 to 90% by mass.
About 80% by mass. In addition, the proportion of iron oxide in the balance other than water and oil (such as iron) is usually 10% by mass.
Or more, preferably 20% by mass or more, more preferably 3% by mass.
0 mass% or more.
【００２４】なお、前記含油スラッジは乾燥が困難であ
るため、水や油の含有量が高い場合が多く、気流などに
よる粉体輸送性が必ずしも高くなく、溶銑への供給がス
ムーズに行えない場合がある。そのため、吸水性及び／
又は吸油性の物質と含油スラッジとを混合して、輸送性
を高めてもよい（以下、この混合物を含油スラッジ混合
物と称する場合がある）。好ましくは、吸水性を有しか
つ含油スラッジと混合した場合に発熱する物質が使用で
きる。吸水性発熱物質を使用すると、発熱により水分の
一部を蒸発脱水でき有利である。Since the oil-containing sludge is difficult to dry, the content of water and oil is often high, and the powder transportability by air current is not always high, so that the supply to hot metal cannot be performed smoothly. There is. Therefore, water absorption and / or
Alternatively, an oil-absorbing substance may be mixed with an oil-containing sludge to enhance transportability (hereinafter, this mixture may be referred to as an oil-containing sludge mixture). Preferably, a substance that has water absorption and generates heat when mixed with the oil-containing sludge can be used. The use of a water-absorbing heat-generating substance is advantageous because a part of water can be evaporated and dehydrated by heat generation.
【００２５】吸水性発熱物質には、焼石灰、生石灰、軽
焼ドロマイトなどのＣａＯ含有化合物が含まれる。Ｃａ
Ｏ含有化合物を用いると、水和反応によって水分を吸収
できるだけでなく、水和によって生成した微細なＣａ
（ＯＨ）2に油も吸着できる。The water-absorbing exothermic substance includes CaO-containing compounds such as calcined lime, quicklime and lightly burned dolomite. Ca
When an O-containing compound is used, not only can moisture be absorbed by a hydration reaction, but also fine Ca
(OH) 2 can also adsorb oil.
【００２６】前記吸水性物質の使用量は、含油スラッジ
中の水１００質量部に対して、例えば、１０〜３００質
量部程度、好ましくは３０〜２００質量部程度、さらに
好ましくは５０〜１５０質量部程度である。The amount of the water-absorbing substance used is, for example, about 10 to 300 parts by weight, preferably about 30 to 200 parts by weight, more preferably 50 to 150 parts by weight, based on 100 parts by weight of water in the oil-containing sludge. It is about.
【００２７】また、前記含油スラッジ（又は含油スラッ
ジ混合物）は、溶銑副原料と共に、脱リン剤や脱珪剤と
して溶銑に供給してもよい。前記溶銑副原料には、固体
酸素（鉄鉱石、ダスト、焼結鉱、ミルスケール、転炉滓
など）、カルシウム成分（生石灰、消石灰、炭酸石灰、
ドロマイトなど）、造滓剤（ほたる石など）などが含ま
れる。脱リン剤として使用する場合、カルシウム成分の
割合を比較的多くし（例えば、含油スラッジ１００重量
部に対して、カルシウム成分３０〜２００重量部程
度）、脱珪剤として使用する場合、カルシウム成分の割
合を比較的少なくする（例えば、含油スラッジ１００重
量部に対して、カルシウム成分０〜１００重量部程
度）。The oil-containing sludge (or oil-containing sludge mixture) may be supplied to the hot metal as a dephosphorizing agent or a desiliconizing agent together with the hot metal auxiliary material. The hot metal auxiliary material includes solid oxygen (iron ore, dust, sinter, mill scale, converter slag, etc.), calcium component (quick lime, slaked lime, carbonated lime,
Dolomite, etc.) and slag-making agents (fluorite, etc.). When used as a dephosphorizing agent, the ratio of the calcium component is made relatively large (for example, about 30 to 200 parts by weight of the calcium component with respect to 100 parts by weight of the oil-containing sludge). The ratio is relatively small (for example, about 0 to 100 parts by weight of the calcium component with respect to 100 parts by weight of the oil-containing sludge).
【００２８】前記含油スラッジ（又は含油スラッジ混合
物）や副原料などを溶銑に供給するキャリアガスの種類
は、溶銑予備処理に悪影響を与えないガスである限り特
に限定されず、例えば、窒素、ヘリウム、アルゴンなど
の不活性ガスが使用できる。The type of the carrier gas for supplying the oil-containing sludge (or the oil-containing sludge mixture) and the auxiliary material to the hot metal is not particularly limited as long as the gas does not adversely affect the hot metal pretreatment. For example, nitrogen, helium, An inert gas such as argon can be used.
【００２９】[0029]
【実施例】以下、実施例を挙げて本発明をより具体的に
説明するが、本発明はもとより下記実施例によって制限
を受けるものではなく、前・後記の趣旨に適合し得る範
囲で適当に変更を加えて実施することも勿論可能であ
り、それらはいずれも本発明の技術的範囲に包含され
る。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples, and the present invention is not limited thereto. Of course, the present invention can be embodied with modifications, all of which are included in the technical scope of the present invention.
【００３０】実施例１（脱リン処理） 含油スラッジと生石灰とを表１に示す割合で混合し、ス
ラッジ混合物を調製した。結果を組成と共に表１に示
す。Example 1 (Dephosphorization treatment) Oil-containing sludge and quicklime were mixed in the ratio shown in Table 1 to prepare a sludge mixture. The results are shown in Table 1 together with the composition.
【００３１】[0031]
【表１】 [Table 1]
【００３２】２７０ｔ混銑車中の溶銑（リン含有量＝
０．１００質量％、珪素含有量＝０．２０質量％）に対
して、前記スラッジ混合物１〜４を副原料（鉄鉱石、生
石灰、蛍石、転炉滓）と共に脱リン剤として供給した。
前記脱リン剤は、キャリアガス（Ｎ2ガス）を用いて気
流によって輸送し、インジェクションランスから混銑車
内の溶銑へ供給した。表２に示す範囲で、スラッジ混合
物及び副原料の供給速度（及び供給量）、キャリアガス
の供給速度、気体酸素の供給速度（及び供給量）、溶銑
温度、溶銑の湯面からインジェクションランス出口まで
の距離を変化させた（実験例１〜１０）。Hot metal (phosphorus content =
The sludge mixtures 1 to 4 were supplied as a dephosphorizing agent together with auxiliary materials (iron ore, quicklime, fluorite, converter slag) with respect to 0.100% by mass and silicon content = 0.20% by mass.
The dephosphorizing agent was transported by airflow using a carrier gas (N 2 gas), and was supplied from an injection lance to hot metal in a mixed iron vehicle. In the range shown in Table 2, the supply rate (and supply amount) of the sludge mixture and the auxiliary material, the supply rate of the carrier gas, the supply rate (and supply amount) of gaseous oxygen, the hot metal temperature, the hot metal surface to the injection lance outlet Was changed (Experimental Examples 1 to 10).
【００３３】[0033]
【表２】 [Table 2]
【００３４】表２に示す操作において、含油スラッジ供
給口の距離Ｈ、溶銑温度Ｔ、含油スラッジの供給速度Ｑ
ｓ、含油スラッジ中の油の含有量Ｎ、及びキャリアガス
の流量Ｑｇを前記式（１ａ）に従って整理すると共に、
発煙の大小を目視にて観察した。さらに溶銑予備処理後
の溶銑中のリン含有量及び珪素含有量を測定した。In the operation shown in Table 2, the distance H of the oil-containing sludge supply port, the hot metal temperature T, and the supply rate Q of the oil-containing sludge
s, the content N of the oil in the oil-containing sludge, and the flow rate Qg of the carrier gas are arranged according to the above formula (1a).
The magnitude of the fuming was visually observed. Furthermore, the phosphorus content and the silicon content in the hot metal after the hot metal pretreatment were measured.
【００３５】なお含油スラッジの供給速度Ｑｓを求める
に当たり、本実施例ではスラッジではなくスラッジ混合
物を供給しているため、スラッジの供給速度Ｑｓは、下
記式に従って求めた。When the supply rate Qs of the oil-containing sludge is determined, the sludge supply rate Qs is determined in accordance with the following equation because the sludge mixture is supplied instead of the sludge in the present embodiment.
【００３６】Ｑｓ＝Ｑｓmix×Ｒ／１００ （式中、Ｑｓmixはスラッジ混合物の供給速度（ｋｇ／
分・溶銑トン）を示す。Ｒはスラッジ混合物１００質量
部を得るために用いたスラッジの質量を示す） 結果を表３及び図１に示す。なお、図１には前記実験例
１〜１０と同様にして条件を変化させた他の実験結果も
合わせて示した。Qs = Qs mix × R / 100 (where Qs mix is the feed rate of the sludge mixture (kg /
Min / ton of hot metal). R indicates the mass of the sludge used to obtain 100 parts by mass of the sludge mixture.) The results are shown in Table 3 and FIG. FIG. 1 also shows other experimental results in which the conditions were changed in the same manner as in Experimental Examples 1 to 10.
【００３７】[0037]
【表３】 [Table 3]
【００３８】図１及び表３から明らかなように、式（１
ａ）の条件を満たす場合、発煙が少なく不完全燃焼を防
止できる。また前記条件で効率良く脱リンできる。なお
実験例１及び２は従来の一般的な方法であるが、この方
法では式（１ａ）の条件を満たさず、不完全燃焼を防止
できない。As is clear from FIG. 1 and Table 3, the expression (1)
When the condition (a) is satisfied, smoke generation is small and incomplete combustion can be prevented. Further, dephosphorization can be performed efficiently under the above conditions. Although Experimental Examples 1 and 2 are conventional general methods, this method does not satisfy the condition of Expression (1a) and cannot prevent incomplete combustion.
【００３９】実施例２（脱珪処理） ２７０ｔ混銑車中の溶銑（リン含有量＝０．１００質量
％、珪素含有量＝０．４０質量％）に対して、前記スラ
ッジ混合物１〜４を副原料（鉄鉱石、生石灰、蛍石、転
炉滓）と共に脱珪剤として供給した。前記脱珪剤は、キ
ャリアガス（Ｎ 2ガス）を用いて気流によって輸送し、
インジェクションランスから混銑車内の溶銑へ供給し
た。表４に示す範囲で、スラッジ混合物及び副原料の供
給速度（及び供給量）、キャリアガスの供給速度、気体
酸素の供給速度（及び供給量）、溶銑温度、溶銑の湯面
からインジェクションランス出口までの距離を変化させ
た（実験例１１〜２０）。Example 2 (Desiliconization treatment) Hot metal (phosphorus content = 0.100 mass) in a 270 t mixed iron wheel
%, Silicon content = 0.40% by mass).
Mixture 1 to 4 as auxiliary materials (iron ore, quicklime, fluorite,
Together with the furnace slag). The desiliconizing agent is
Carrier gas (N TwoGas) and transported by airflow,
Supply from the injection lance to the hot metal in the
Was. Within the range shown in Table 4, the supply of the sludge mixture and
Supply rate (and supply amount), carrier gas supply rate, gas
Oxygen supply rate (and supply amount), hot metal temperature, hot metal surface
Change the distance from the
(Experimental Examples 11 to 20).
【００４０】[0040]
【表４】 [Table 4]
【００４１】表４に示す操作において、距離Ｈ、溶銑温
度Ｔ、含油スラッジの供給速度Ｑｓ、含油スラッジ中の
油の含有量Ｎ、及びキャリアガスの流量Ｑｇを前記式
（１ａ）に従って整理すると共に、発煙の大小を目視に
て観察した。さらに溶銑予備処理後の溶銑中のリン含有
量及び珪素含有量を測定した。In the operation shown in Table 4, the distance H, the hot metal temperature T, the supply rate Qs of the oil-containing sludge, the oil content N in the oil-containing sludge, and the flow rate Qg of the carrier gas are arranged in accordance with the above equation (1a). The size of smoke was visually observed. Furthermore, the phosphorus content and the silicon content in the hot metal after the hot metal pretreatment were measured.
【００４２】結果を表５及び図２に示す。なお、図２に
は前記実験例１１〜２０と同様にして条件を変化させた
他の実験結果も合わせて示した。The results are shown in Table 5 and FIG. FIG. 2 also shows other experimental results in which the conditions were changed in the same manner as in Experimental Examples 11 to 20.
【００４３】[0043]
【表５】 [Table 5]
【００４４】図２及び表５から明らかなように、式（１
ａ）の条件を満たす場合、発煙が少なく不完全燃焼を防
止できる。また前記条件で効率良く脱珪できる。なお実
験例１１及び１２は従来の一般的な方法であるが、この
方法では式（１ａ）の条件を満たさず、不完全燃焼を防
止できない。As is clear from FIG. 2 and Table 5, the expression (1)
When the condition (a) is satisfied, smoke generation is small and incomplete combustion can be prevented. In addition, desiliconization can be performed efficiently under the above conditions. Although Experimental Examples 11 and 12 are conventional general methods, this method does not satisfy the condition of Expression (1a) and cannot prevent incomplete combustion.
【００４５】[0045]
【発明の効果】本発明によれば、含油スラッジの供給口
の距離Ｈ、溶銑温度Ｔ、含油スラッジの供給速度Ｑｓ、
含油スラッジ中の油の含有量Ｎ及びキャリアガスの流量
Ｑｇが特定の条件を満たすように操業しているため、溶
銑予備処理で含油スラッジを処理しても不完全燃焼を防
止できる。According to the present invention, the distance H of the supply port of the oil-containing sludge, the hot metal temperature T, the supply speed Qs of the oil-containing sludge,
Since the operation is performed so that the oil content N in the oil-containing sludge and the flow rate Qg of the carrier gas satisfy specific conditions, incomplete combustion can be prevented even if the oil-containing sludge is treated in the hot metal pretreatment.
【図１】 図１は実施例１における式（１ａ）の関係を
示すグラフである。FIG. 1 is a graph showing the relationship of Expression (1a) in Example 1.
【図２】 図２は実施例２における式（１ａ）の関係を
示すグラフである。FIG. 2 is a graph showing the relationship of Expression (1a) in Example 2.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4D059 AA10 BB01 BC05 DA04 DA47 EB02 EB11 EB15 4K014 AA01 AA03 AB03 AB04 AB12 AB16 AC14 AC16 AD01 AD27 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D059 AA10 BB01 BC05 DA04 DA47 EB02 EB11 EB15 4K014 AA01 AA03 AB03 AB04 AB12 AB16 AC14 AC16 AD01 AD27
Claims (6)
理する方法であって、下記式（１ａ）を満たす条件で操
業して含油スラッジ中の油の不完全燃焼を防止する溶銑
予備処理方法。 Ｈ≧６５００−５×Ｔ＋４００×Ｑｓ×Ｎ＋１００００×Ｑｇ …（１ａ） ［式中、Ｈは溶銑湯面から含油スラッジ供給口までの距
離（ｍｍ）を示し、Ｔは溶銑の温度（℃）を示し、Ｑｓ
は含油スラッジの供給速度（ｋｇ／分・溶銑トン）を示
し、Ｎは含油スラッジ中の油の含有量（質量％）を示
し、Ｑｇは含油スラッジを輸送するためのキャリアガス
の流量（Ｎｍ3／分・溶銑トン）を示す］1. A method for pre-treating hot metal by adding oil-containing sludge to hot metal, the method comprising operating under conditions satisfying the following formula (1a) to prevent incomplete combustion of oil in the oil-containing sludge. H ≧ 6500−5 × T + 400 × Qs × N + 10000 × Qg (1a) [where H represents the distance (mm) from the hot metal surface to the oil-containing sludge supply port, and T represents the temperature (° C.) of the hot metal. , Qs
Indicates the feed rate of the oil-containing sludge (kg / min. Tons of hot metal), N indicates the oil content (% by mass) in the oil-containing sludge, and Qg indicates the flow rate (Nm 3) of the carrier gas for transporting the oil-containing sludge. / Min / ton of hot metal)]
Ｈが３００〜２０００ｍｍ、溶銑温度Ｔが１２５０〜１
５００℃、含油スラッジの供給速度Ｑｓが０．０２〜３
ｋｇ／分・溶銑トン、含油スラッジ中の油の含有量Ｎが
０．１〜３０質量％、キャリアガス流量Ｑｇが０．０１
〜０．３Ｎｍ3／分・溶銑トンである請求項１記載の溶
銑予備処理方法。2. The distance H from the molten metal surface to the oil-containing sludge supply port is 300 to 2000 mm, and the hot metal temperature T is 1250 to 1 mm.
500 ° C, oil-containing sludge feed rate Qs is 0.02 to 3
kg / min · ton of hot metal, oil content N in the oil-containing sludge is 0.1 to 30% by mass, and carrier gas flow rate Qg is 0.01
~0.3Nm 3 / of claim 1, wherein a minute-hot metal ton molten iron pretreatment process.
たときに発熱する物質と、含油スラッジとを予め混合し
た後、溶銑に加える請求項１又は２に記載の溶銑予備処
理方法。3. The hot metal pretreatment method according to claim 1, wherein a substance having a water absorbing property and generating heat when mixed with the oil-containing sludge and the oil-containing sludge are mixed in advance and then added to the hot metal.
である請求項３記載の溶銑予備処理方法。4. The hot metal pretreatment method according to claim 3, wherein the water-absorbing exothermic substance is a CaO-containing compound.
て、吸水性発熱物質を５０〜１５０質量部混合する請求
項３又は４記載の溶銑予備処理方法。5. The hot metal pretreatment method according to claim 3, wherein 50 to 150 parts by mass of a water-absorbing heating substance is mixed with 100 parts by mass of water in the oil-containing sludge.
％、油含有量が０．５〜１５質量％であって、残部のう
ち３０質量％以上が酸化鉄である請求項１〜５のいずれ
かに記載の溶銑予備処理方法。6. The oil-containing sludge having a water content of 5 to 40% by mass, an oil content of 0.5 to 15% by mass, and the remaining 30% by mass or more of iron oxide. The hot metal pretreatment method according to any one of the above.
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