JPH0353029A - Method for recycling steel making dusts in electric furnace having scrap preheating furnace - Google Patents
Method for recycling steel making dusts in electric furnace having scrap preheating furnaceInfo
- Publication number
- JPH0353029A JPH0353029A JP1188250A JP18825089A JPH0353029A JP H0353029 A JPH0353029 A JP H0353029A JP 1188250 A JP1188250 A JP 1188250A JP 18825089 A JP18825089 A JP 18825089A JP H0353029 A JPH0353029 A JP H0353029A
- Authority
- JP
- Japan
- Prior art keywords
- pellets
- dust
- curing
- weight
- electric furnace
- 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.)
- Granted
Links
- 238000009628 steelmaking Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims description 32
- 238000004064 recycling Methods 0.000 title abstract description 6
- 239000000428 dust Substances 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000002994 raw material Substances 0.000 claims abstract description 31
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 21
- 238000005469 granulation Methods 0.000 claims description 33
- 230000003179 granulation Effects 0.000 claims description 33
- 238000002156 mixing Methods 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000008188 pellet Substances 0.000 abstract description 70
- 238000010438 heat treatment Methods 0.000 abstract description 25
- 238000010298 pulverizing process Methods 0.000 abstract description 4
- 238000013019 agitation Methods 0.000 abstract 1
- 238000005453 pelletization Methods 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 description 18
- 239000000843 powder Substances 0.000 description 18
- 239000000203 mixture Substances 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 239000004568 cement Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 6
- 238000004898 kneading Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000010309 melting process Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000011396 hydraulic cement Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000009775 high-speed stirring Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- -1 Ca2+ ion Chemical class 0.000 description 1
- 206010011224 Cough Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ＣａＯ含有製鋼ダスト及び含油，含水スケー
ル類をスクラップ予熱炉を有する電気炉において再利用
する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for recycling CaO-containing steelmaking dust and oil- and water-containing scales in an electric furnace having a scrap preheating furnace.
製鉄工場では、その製造工程において、多量の粉塵が発
生し、環境改善のための集塵装置が設置され、それらを
回収している。In steel factories, a large amount of dust is generated during the manufacturing process, and dust collectors are installed to collect the dust to improve the environment.
回収された粉塵の多くは、Ｆｅ，Ｎｉ，Ｃｒ等の有価成
分を含んでおり、鉄源あるいは副原料として再利用する
ことが図られている。Most of the collected dust contains valuable components such as Fe, Ni, and Cr, and is intended to be reused as an iron source or auxiliary raw material.
特に、製鋼工程で発生する製鋼ダストは発生量も多く、
その全量を再利用することが求められている。In particular, the amount of steelmaking dust generated during the steelmaking process is large.
It is required that the entire amount be reused.
その製鋼ダストは、微細粉が多く、ペレットやブリケッ
トに団鉱化することが必要である。そして、団鉱化する
に当たっては、製鋼炉上に設けられた副原料ホッパー等
までのハンドリングに耐える圧膚強度を付与するバイン
ダが必要となる。その圧潰強度はハンドリング条件によ
り異なるが、一殻的には３ｍの高さから落下させた時の
粉化率１０重量％以下が得られる７ｋｇ／ペレット以上
あれば実用上充分である。The steelmaking dust contains a lot of fine powder, and it is necessary to briquette it into pellets or briquettes. In briquetting, a binder is required that provides pressure strength to withstand handling up to the auxiliary raw material hopper provided on the steelmaking furnace. The crushing strength varies depending on the handling conditions, but it is practically sufficient if the crushing strength is 7 kg/pellet or more to obtain a pulverization rate of 10% by weight or less when dropped from a height of 3 m.
しかし、！ｌｇダストはＣａＯを含有しており、その含
有率が高いと団鉱化を行う時、添加する水との間の永和
反応により、団鉱後膨張崩壊を生じ、その造粒物（ペレ
ット）は再び粉化してしまい、歩留りが低いという問題
があった。but,! Lg dust contains CaO, and if the content is high, when briquettes are formed, the briquettes expand and collapse due to the permanent reaction with the added water, and the granules (pellets) There was a problem that the product turned into powder again and the yield was low.
そこで、ＣａＯの安定化のために水を添加して、永和反
応によりＣａＯを消化した後に造粒処理をする方法が、
特開昭５６−６５６７０号公報に開示されている。Therefore, the method of adding water to stabilize CaO and digesting CaO by Eiwa reaction is followed by granulation treatment.
It is disclosed in Japanese Patent Application Laid-Open No. 56-65670.
上記製鋼ダストは、乾式集塵機により捕集された乾燥粉
塵である。The above-mentioned steelmaking dust is dry dust collected by a dry dust collector.
一方、圧延工程，酸洗工程等において、湿式集塵機によ
り捕集され、シックナー等で分離され、越流側で回収さ
れる微細粉で脱水の困難なＢスケールと称する泥状スラ
ッジがある。On the other hand, in the rolling process, pickling process, etc., there is a muddy sludge called B scale, which is a fine powder and is difficult to dewater, which is collected by a wet dust collector, separated by a thickener, etc., and recovered on the overflow side.
このＢスケールも有価戒分を含んでおり、製鋼ダストと
同様の再利用が図られている。しかしながら、このＢス
ケールは含水率が高く、再利用のためのハンドリングを
可能とするには、造粒に適する含水率とするために脱水
する必要がある。This B scale also contains valuable precepts, and is intended to be recycled in the same way as steelmaking dust. However, this B scale has a high moisture content, and in order to make it possible to handle it for reuse, it is necessary to dehydrate it to a moisture content suitable for granulation.
更に、Ｂスケールは含油率が高いため、造粒時に粉塵粒
子が油膜に覆われ、バインダとの接触を困難にし、強度
不足となるため、その油分を減量させるか、又は影響さ
れないバインダの使用が必要である。Furthermore, since B scale has a high oil content, the dust particles are covered with an oil film during granulation, making contact with the binder difficult and resulting in insufficient strength. Therefore, it is necessary to reduce the oil content or use a binder that is not affected. is necessary.
そのため、含油含鉄スラッジを天日を利用した耕耘式乾
燥を行った後、予めセメント系バインダと乾燥粉とを混
合したものを供給して造粒する方法や、圧延スラッジを
集積静置して水切りを行ったものと、乾燥粉を混練後、
予め硬化剤と油分を含まない乾燥粉とを混合したものを
供給して造粒する方法が、特公昭５７−４３６２２号公
報、特開昭５４−１０７４７８号公報に開示されている
。Therefore, after drying oil-containing iron-containing sludge under the sun, a mixture of cement binder and dry powder is supplied in advance for granulation, or rolled sludge is collected and left to stand and drained. After kneading the dried powder with the
A method of granulating by supplying a mixture of a curing agent and oil-free dry powder in advance is disclosed in Japanese Patent Publication No. 57-43622 and Japanese Patent Application Laid-Open No. 54-107478.
また、天日乾燥以外の脱水乾燥方法として、転炉ダスト
等にはＦｅＯが多いことを利用して、磨砕．混練するこ
とでＦｅＯの酸化反応熱で乾燥した後造拉する方法が、
特開昭５８−１４０３２８号公報に開示されている。In addition, as a dehydration drying method other than solar drying, grinding and drying methods are available, taking advantage of the fact that converter dust, etc., contains a large amount of FeO. The method involves kneading, drying with the heat of the oxidation reaction of FeO, and then anealing.
It is disclosed in Japanese Unexamined Patent Publication No. 58-140328.
上記の製鋼ダスト．Ｂスケール以外に回収される粉塵と
して、たとえば次のようなものがある。Steelmaking dust mentioned above. Examples of dust collected other than B scale include the following:
精製工程において、乾式集塵機により捕集される粗粒粉
の多いショットスケールがある。In the refining process, there is shot scale, which contains a lot of coarse powder, which is collected by dry dust collectors.
これにはショットブラスト時に摩滅等により微小粉とな
った金属鉄分であるショット粒が多く含まれている。This contains many shot grains, which are metallic iron particles that have become fine powder due to abrasion during shot blasting.
また、圧延工程，酸洗工程等において、湿式集塵機によ
り捕集され、シックナー等で分離され沈降側で回収され
る粗粒粉が多く、脱水の容易なＡスケールと称されるス
ケールやデスケーリング時のビットスケール等がある。In addition, in the rolling process, pickling process, etc., there is a large amount of coarse powder that is collected by a wet dust collector, separated by a thickener, etc., and recovered on the settling side. There are bit scales, etc.
上記のスケール類は、取扱いも比較的容易であり、単体
で使用されることが多い。The above scales are relatively easy to handle and are often used alone.
このようなダスト、スケール類を再利用する場として、
例えば電気炉製鋼がある。As a place to reuse such dust and scale,
For example, there is electric furnace steelmaking.
この電気炉製鋼においては、例えば特公昭６３−４９１
５３号公報に開示されているように、エネルギーコスト
の低減やその有効利用のためのスクラップ予熱が行われ
ている。In this electric furnace steelmaking, for example,
As disclosed in Japanese Patent No. 53, scrap preheating is being carried out to reduce energy costs and make effective use of them.
そのスクラップ予熱での予熱温度は一般に２００〜３０
０℃であるが、更に予熱に要する費用と予熱により得ら
れる利益が見合う範囲でスクラップ予熱炉を２基以上設
けて順次加熱することで高温とすることも試みられてい
る。The preheating temperature in the scrap preheating is generally 200 to 30
Although the temperature is 0° C., attempts have also been made to raise the temperature to a higher temperature by installing two or more scrap preheating furnaces and heating them one after another, as long as the cost required for preheating and the profit obtained from preheating are balanced.
このような電気炉製鋼に、上記ダスト１スケール類を利
用するに際してのべレフトの装入は、電気炉上の副原料
ホッパ等から行うより、スクラップと共にベレフトも予
熱後装入する方が電気炉への投入エネルギーの有効利用
の面から有利であると考えられる。また、このベレット
をスクラップと共に装入することは、ダストの再利用に
際して副原料ホッパ一等のべレフト装入設備が不用とな
る利点がある。ただし、そのためには、常温圧潰強度に
加えて予熱後電気炉への装入に際し、ペレットが粉化し
ない圧潰強度、さらに熱処理後残留強度を保持している
必要がある。When using the above-mentioned dust 1 scale in such electric furnace steelmaking, it is better to charge the beleft together with the scrap after preheating than to charge it from the auxiliary material hopper on the electric furnace. This is considered to be advantageous in terms of effective use of energy input into the system. Further, charging the pellets together with the scraps has the advantage of eliminating the need for pellet charging equipment such as an auxiliary material hopper when reusing the dust. However, in order to do this, in addition to the crushing strength at room temperature, the pellets must have a crushing strength that does not turn into powder when charged into an electric furnace after preheating, and a residual strength after heat treatment.
従来の造粒方法では、非焼成ベレットとして特開昭５６
−６５６７０号公報に記載のようにバインダを添加しな
いものが開示されているが、一般的にはその添加量が少
なくとも充分な養生期間をおけば必要な圧潰強度を得ら
れる水硬性のセメント系バインダが使用されているが、
上記したスクラップ予熱炉を有する電気炉において、水
硬性のセメント系バインダを使用したべレフトを予熱し
た場合、ＣａＯ水和物が蒸発し、また予熱中に水分が急
速に消失してセメントの結合力が低下する。その脆くな
ったペレフトは、高温の予熱ガスに吹き曝されて粉化す
るという問題も生じる。In the conventional granulation method, as non-fired pellets, JP-A-56
As described in Japanese Patent No. 65670, a binder without the addition of a binder is disclosed, but in general, the amount of addition is at least a hydraulic cement-based binder that can obtain the necessary crushing strength after a sufficient curing period. is used, but
When a beleft using a hydraulic cement binder is preheated in an electric furnace equipped with the above-mentioned scrap preheating furnace, CaO hydrate evaporates, and water rapidly disappears during preheating, increasing the bonding strength of the cement. decreases. The problem arises that the brittle pellets become powder when exposed to high-temperature preheated gas.
さらに、水硬性のセメント系バインダを使用する場合に
は、広大な屋内養生ヤードを必要とするという問題もあ
る。Furthermore, when using a hydraulic cement binder, there is also the problem that a vast indoor curing yard is required.
さらに、含油率が高いＢスケールの再利用のため含油分
の影響を除くために、造粒工程において乾燥粉体とバイ
ンダとの混合粉体を添加して２層構造のべレフトとする
方法もある。Furthermore, in order to reuse the B scale with a high oil content, in order to remove the influence of the oil content, there is a method of adding a mixed powder of dry powder and a binder in the granulation process to create a two-layer structure. be.
ところが、この方法では乾．湿粉それぞれの処理設備を
必要とするため工程、設備が複雑になるという欠点があ
る。However, with this method, it is dry. There is a drawback that the process and equipment become complicated because processing equipment for each wet powder is required.
また、含Ｆｅ○粉体が含有するＦｅ○を活性化して乾燥
する方法もあるが、管理に手間がかかるボールミル等の
磨砕混練機を必要とするうえ、温度管理をしなければな
らない手間がかかる。There is also a method of activating Fe○ contained in Fe○ powder and drying it, but this requires a grinding and kneading machine such as a ball mill that takes time and effort to manage, and it also requires time and effort to control the temperature. It takes.
本発明において解決すべき課題は、上記従来の製鋼ダス
ト等の有価廃棄物の再利用のための処理に際しての問題
点を解決することにあって、集塵製鋼ダスト類を原料と
して、短時間に必要な常温圧潰強度を発現させ、電気炉
製鋼の予熱工程を利用して、その高温ガスに吹き曝され
ても粉化することなく、更に圧潰強度を増加させ得る非
焼戒ペレットを製造し、スクラップ予熱炉を有する電気
炉において使用できる再利用方法を提供するものである
。The problem to be solved by the present invention is to solve the above-mentioned problems in the conventional processing of valuable waste such as steelmaking dust for reuse, and to solve the problem by using collected steelmaking dust as raw material in a short time. Manufacture non-burning pellets that can develop the necessary room temperature crushing strength, use the preheating process of electric furnace steelmaking, do not turn into powder even when exposed to high-temperature gas, and can further increase the crushing strength. The present invention provides a recycling method that can be used in an electric furnace having a scrap preheating furnace.
本発明のスクラップ予熱炉を有する電気炉における製鋼
ダスト類の再利用方法は、ＣａＯ含有製鋼ダストを撹拌
しながら水を添加して養生し造粒原料とする工程と、こ
の造粒原料１００重量％に対し、３〜７重量％の水ガラ
スを添加し、調湿混棟して造粒し養生する工程と、養生
後の造粒物をスクラップを収納した予熱炉内に投入し、
スクラップ予熱温度まで加熱した後、スクラップと共に
電気炉内に装入する工程とからなるものである。The method of reusing steelmaking dust in an electric furnace having a scrap preheating furnace according to the present invention includes a step of curing CaO-containing steelmaking dust by adding water while stirring it to make it into a granulation raw material, and a process in which the granulation raw material is 100% by weight. 3 to 7% by weight of water glass is added to the mixture, the mixture is mixed with humidity control, granulated and cured, and the granulated material after curing is placed in a preheating furnace containing scraps.
This process consists of heating the scrap to a preheating temperature and then charging it together with the scrap into an electric furnace.
また、本発明はＣａＯ含有製鋼ダストと共に含水スケー
ルの再利用のために使用することができる。Further, the present invention can be used together with CaO-containing steelmaking dust for recycling hydrous scale.
すなわち、造粒原料とする工程が、ＣａＯ含有製鋼ダス
トに含水率５０重量％以下に脱水した含油，含水スケー
ルを混合し養生して造粒原料とする工程とすることがで
きる。That is, the step of preparing the raw material for granulation can be a step of mixing CaO-containing steelmaking dust with oil-containing and water-containing scales that have been dehydrated to a water content of 50% by weight or less and curing the mixture to obtain a raw material for granulation.
さらに、造粒原料とする工程がＣａＯ含有製鋼ダストと
、含水率５０重量％以下に脱水した含油，含水スケール
とを混合し、養生した後、該養生物と乾燥スケールとを
混合することができる。Further, the step of preparing the raw material for granulation involves mixing CaO-containing steelmaking dust with oil- and water-containing scale that has been dehydrated to a moisture content of 50% by weight or less, curing the mixture, and then mixing the curing agent with the dry scale. .
本発明は、ＣａＯ含有製鋼ダストを撹拌しながら水を添
加するか、あるいはこれに含水スケールを混合したもの
を撹拌してダスト中に水分を分散させ、ＣａＯ水和反応
を促進させてＣａＯを消化、安定化させるために１〜２
日間養生して、含水率２〜１０重量％の造校原科とする
ことと、造粒時に添加する水ガラスとＣａＯの永和反応
物との反応を利用して、ペレットの硬化を促進し、更に
これを予熱することでその硬度を大幅に増加し得ること
を可能とする。In the present invention, water is added to CaO-containing steelmaking dust while stirring, or a mixture of water-containing scale is stirred to disperse water in the dust, thereby promoting the CaO hydration reaction and digesting CaO. , 1-2 to stabilize
The pellets are cured for several days to form a raw material with a moisture content of 2 to 10% by weight, and the hardening of the pellets is promoted by utilizing the reaction between the water glass added during granulation and the permanent reaction product of CaO. Furthermore, preheating it makes it possible to significantly increase its hardness.
上記造粒原料とする工程における含油，含水スケールの
含水率が５０重量％を超えると、混線機へのハンドリン
グが困難で、且つこの方法では不経済となるので含水ス
ケールの含水率は５０重量％以下に規定される。If the water content of the oil- and water-containing scale exceeds 50% by weight in the step of making it into a granulation raw material, it will be difficult to handle it in the crosstalk machine, and this method will be uneconomical, so the water content of the water-containing scale should be 50% by weight. Defined below.
また、造粒原料の配合割合は、ＣａＯ含有Ｉ！！鋼ダス
ト５０〜８０重量％、含油，含水スケールが２０重量％
未満では未消化ＣａＯの含有量が次工程での水ガラスに
よる硬化反応分以上に過大となり、予熱実施中に膨張粉
化を招き、５０重量％を超えると含水量が過剰となり、
養生日数が長くなるほか、次工程での水ガラス添加量の
余裕が減少する。In addition, the blending ratio of the granulation raw materials is as follows: CaO-containing I! ! 50-80% by weight of steel dust, 20% by weight of oil- and water-containing scales
If it is less than 50% by weight, the content of undigested CaO will be too much than that of the curing reaction with water glass in the next step, causing expansion and powdering during preheating, and if it exceeds 50% by weight, the water content will be excessive.
In addition to lengthening the curing period, there is less margin for the amount of water glass added in the next process.
造粒原料とする工程における水の添加量は、３重量％未
満では未消化ＣａＯが残り、造粒後に未消化ＣａＯの永
和反応が起こり、ベレットの膨張粉化を招き、１５重量
％を超えると含水量が過剰となり、養生日数が長くなる
ほか、次工程での水ガラス添加量の余裕が減少する。If the amount of water added in the process of making the raw material for granulation is less than 3% by weight, undigested CaO will remain, and a permanent reaction of undigested CaO will occur after granulation, causing the pellets to expand and turn into powder; if it exceeds 15% by weight, The water content becomes excessive, which lengthens the curing time and reduces the margin for the amount of water glass added in the next process.
この造粒原料をバンペレタイザ等の転勤造粒機に供給し
ながら、その造粒後のペレット水分が１０〜ｌ５重量％
となるように調湿混棟して造粒し、粒径３〜３０ｍｍの
べレフトとした後、水和したＣａ （ＤＨ） ２及びｘ
ｃａｏ， ＳｉＣ）ａ・ｎＨ２０を水ガラスと反応させ
、珪酸ソーダをゲル化させることでベレットを硬化させ
るために１日間以上養生する。熱処理後残留強度及び高
熱の予熱ガスに吹き曝されても粉化しないバインダとし
て水ガラスを用いることにより、処理困難なＢスケール
を始め、製鉄工場で発生する種々の性状の異なる集塵粉
体を総合的に一括して造粒処理することができる。While feeding this granulation raw material to a transfer granulator such as a van pelletizer, the pellet moisture content after granulation is 10 to 15% by weight.
After granulating in a humidity-controlled mixture so that the particle size is 3 to 30 mm, hydrated Ca (DH) 2 and x
cao, SiC) a·nH20 is reacted with water glass, and the pellet is cured for one day or more to harden the pellet by gelling the sodium silicate. By using water glass as a binder that has residual strength after heat treatment and does not turn into powder even when exposed to high-temperature preheating gas, it is possible to collect dust particles with different properties generated in steel factories, including B scale, which is difficult to process. The granulation process can be carried out in a comprehensive manner.
本発明において使用する水ガラスは、２ＣａＯ・Ｓｌ０
２ を硬化剤とするダイヵル鋳型の形或に利用されてお
り、その硬化機構は次の反応によるとされている。The water glass used in the present invention is 2CaO・Slo
2 is used as a hardening agent in the form of a dical mold, and its hardening mechanism is said to be based on the following reaction.
ＣａＯ＋Ｈ ２ ０ →Ｃａ （０｝！） ２Ｃａ（Ｏ
ＨＬ−Ｃａ”＋ ２０８−
このＣａ２＋イオンの存在によって珪酸ソーダのゲル化
が起こり、その反応式は次の通りである。CaO+H 2 0 →Ca (0}!) 2Ca(O
HL-Ca"+ 208- The presence of this Ca2+ ion causes gelation of sodium silicate, and the reaction formula is as follows.
Ｎａｚ○，ＳｉＯ２・ｎＨｚ○＋２ＣａＯ．ＳｉＯ．＝
８ＣａＯ， Ｓｉ○２・ｎＨ，○＋Ｓｌ ０２ ＋Ｎａ
Ｏ Ｈ上記の反応は、温度が高いほど短時間に進行す
るとされている。ところで、製鋼ダストには電気炉の操
業条件等により、かなりの幅で変動するものの９〜２０
重量％のＣａＯを含有し、そのうち、遊離ＣａＯが２〜
１０重量％存在している。Naz○, SiO2・nHz○+2CaO. SiO. =
8CaO, Si○2・nH,○+Sl 02 +Na
OH It is said that the above reaction proceeds in a shorter time as the temperature is higher. By the way, steelmaking dust varies considerably depending on the operating conditions of the electric furnace, etc.
% by weight of CaO, of which free CaO is 2~2% by weight.
It is present in an amount of 10% by weight.
このため、スクラップ予熱炉を有する電気炉への製鋼ダ
スト類の再利用に当たって、そのペレットのバインダと
して水ガラスを用いると、上記硬化機構と同様の反応が
生じる。Therefore, when water glass is used as a binder for pellets when steelmaking dust is reused in an electric furnace having a scrap preheating furnace, a reaction similar to the hardening mechanism described above occurs.
また、造粒工程における水ガラスの添加量は、３重量％
未満では熱処理後残留強度が不足し、７重量％を超える
と不経済となるほか、上記造粒原料の含水量によっては
水ガラスを加えたときの全含水量が造粒可能水分量を超
え、造粒不能となる。In addition, the amount of water glass added in the granulation process was 3% by weight.
If it is less than 7% by weight, the residual strength after heat treatment will be insufficient, and if it exceeds 7% by weight, it will be uneconomical, and depending on the water content of the granulation raw material, the total water content when water glass is added will exceed the water content that can be granulated. Granulation becomes impossible.
上記工程により処理したべレフトの常温圧潰強度は、造
粒後５日間養生したもので１０ｋｇ／ペレット以上、ま
た、９００℃での高温予熱後の熱処理後残留強度は１０
ｋｇ ／ペレット以上、その粉化率は５重量％以下のも
のを得ることができる。The normal temperature crushing strength of Beleft treated by the above process is 10 kg/pellet or more after curing for 5 days after granulation, and the residual strength after heat treatment after high temperature preheating at 900°C is 10 kg/pellet or more.
kg/pellet or more, and the pulverization rate is 5% by weight or less.
（以下、この頁余白）
〔実施例〕
第１表
電気炉ダスト・スケール類の性状
実施例１
第１表中に示すＣａＯ含有量１０．５重量％の製鋼ダス
トを用いて、
第１１！Ｉに示す工程により造粒処理
し、予熱後電気炉で使用した。ＣａＯ含有製鋼ダストを
混合槽長さ２５００＋＋＋ＩＩ１のバグミキサに供給し
ながら、該ダスト１００重量％に対し７重量％の水を添
加し、分散混合させた後、パレット内にｌ日間静置し、
自然養生を行った。養生後、その含水率は２重量％であ
った。(Hereinafter, the margins of this page) [Example] Table 1 Properties of electric furnace dust and scales Example 1 Using steelmaking dust with a CaO content of 10.5% by weight shown in Table 1, No. 11! It was granulated according to the process shown in I, and used in an electric furnace after preheating. While supplying CaO-containing steelmaking dust to a bag mixer with a mixing tank length of 2500+++II1, 7% by weight of water was added to 100% by weight of the dust, dispersed and mixed, and then allowed to stand still in a pallet for 1 day.
I took natural care. After curing, its moisture content was 2% by weight.
上記養生後の造粒原料をパレットからホッパへ移し、振
動フィーダを用いて内径１５００ｍｍ，深さ２５０＋＋
ｕｓ， ’ 回転ｌｉｔ（１０ ｒｐｍのパンペレタイ
ザへ毎時ＩＴで連続供給しながら、Ｊ［３３号水ガラス
を造粒原料１００重量％に対し６重量％を添加し、造粒
後のべレフト水分が１３〜１４重量％となるようにＩ湿
混練し、粒径１０〜１５ＩｎＩＩ１のペレットを得た。After the above curing, the granulated raw material is transferred from the pallet to the hopper, and using a vibration feeder, the inner diameter is 1500mm and the depth is 250++.
us, 'While continuously feeding the rotating lit (10 rpm) pan pelletizer by IT every hour, J [No. The mixture was wet-kneaded to a concentration of 14% by weight to obtain pellets with a particle size of 10 to 15 InII1.
該ペレットをパレット内に５日間静置し自然養生を行っ
た。養生後、その常温圧漬強度は１２．８ｋｇ／ペレッ
トであった。The pellets were allowed to stand in a pallet for 5 days for natural curing. After curing, the cold pressure strength was 12.8 kg/pellet.
上記養生後のべレフトをパレットから投入用シュートへ
移し、予熱炉である上部蓋に電気炉からの高温排ガス通
人配管接続部を有する予熱パケットに予め収納されてい
るスクラップ上へペレットを投入した。After the above-mentioned curing, the pellets were transferred from the pallet to the charging chute, and the pellets were placed on top of the scraps stored in the preheating packet, which had a piping connection for high-temperature exhaust gas from the electric furnace to the upper lid of the preheating furnace. .
ついで、上部蓋を被せ、高温排ガス通人配管を接続して
、そのガスを該パケット内に通人し、スクラップを２０
０〜３００℃に一次加熱後、高温排ガスの供給を停止し
、電気炉の出鋼後、待機中の電気炉炉口上へ該予熱を行
った予熱パケットを搬送し、ペレット及びスクラップを
その電気炉内へ装入後、７００〜９００℃に二次加熱し
、ついで溶解作業を行った。Then, cover the top lid, connect the high temperature exhaust gas passage pipe, let the gas pass through the packet, and collect the scrap for 20 minutes.
After primary heating to 0 to 300°C, the supply of high-temperature exhaust gas is stopped, and after tapping the electric furnace, the preheated packet is transported to the furnace mouth of the waiting electric furnace, and the pellets and scrap are transferred to the furnace. After charging into the interior, it was heated for a second time to 700 to 900°C, and then melted.
また、その溶解作業中において、集塵される製鋼ダスト
は、ベレット未使用時と比べ、特に増加したとは認めら
れなかった。Furthermore, during the melting process, it was not recognized that the steelmaking dust collected was particularly increased compared to when the pellets were not used.
なお、上記ペレットの一部を取出し、その熱処理後残留
強度及び常温圧潰強度の経日変化を調査した。A portion of the above pellets was taken out and the changes in residual strength and room temperature crushing strength after heat treatment over time were investigated.
熱処理後残留強度は養生期間５日のペレットを用い、エ
レマ電気炉へ装入し、第６図に示す加熱パターンにより
９００℃まで加熱し、それぞれの温度で１０分間保持後
、供試ペレットを取出し、万能試験機でその圧潰強度（
熱処理後残留強度）を測定し、上記予熱炉内及び電気炉
内での溶融が始まる前までの加熱中におけるその強度を
推定した。The residual strength after heat treatment was determined using pellets with a curing period of 5 days, charged into an Elema electric furnace, heated to 900°C according to the heating pattern shown in Figure 6, held at each temperature for 10 minutes, and then removed the test pellets. , its crushing strength (
The residual strength after heat treatment was measured, and the strength during heating up to the start of melting in the preheating furnace and electric furnace was estimated.
その結果を第４図に示す。同図から、熱処理後残留強度
は常温時の１２．８ｋｇ／ペレットから３００℃では２
３． ８ｋｇ ／ベレットと大幅に増加し、水ガラスの
特性が現れ、７００℃で１０．２ｋｇ／ペレットまで低
下しているが、これはペレットが加熱され高温になると
ＣａＯの水和物が分解蒸発しペレット内部に微細な巣が
できるためと推測される。The results are shown in FIG. From the same figure, the residual strength after heat treatment is 12.8 kg/pellet at room temperature to 2 at 300°C.
3. The weight increased significantly to 8kg/pellet, and the properties of water glass appeared, and the weight decreased to 10.2kg/pellet at 700℃, but this is because when the pellets are heated to a high temperature, CaO hydrate decomposes and evaporates, resulting in pellets. It is assumed that this is due to the formation of microscopic nests inside.
そして、９００℃を超えるとべレフトは焼結されること
で、その強度が増加するものと推測される。It is presumed that when the temperature exceeds 900°C, the beleft is sintered and its strength increases.
また、常温圧潰強度の経日変化を第５図に示すが、１日
間の養生で８．９ｋｇ／ペレットとなり、充分ノ１ンド
リングに耐える強度となっている。Further, the daily change in the crushing strength at room temperature is shown in Fig. 5, and after one day of curing, the pellet weighed 8.9 kg/pellet, which is strong enough to withstand crushing.
実施例２
第１表中に示すＣａＯ含有量ｌＯ．５重量％の製鋼ダス
ト及び含油，含水スケールであるＡスケール，Ｂスケー
ルとビットスケールを用いて、第２図に示す工程により
ａ粒処理し、パケット予熱後電気炉で使用した。Example 2 CaO content lO. shown in Table 1. Using 5% by weight of steelmaking dust and oil- and water-containing scales A scale, B scale, and bit scale, A-grain processing was performed according to the process shown in FIG. 2, and the packets were preheated and used in an electric furnace.
Ａスケール，Ｂスケール，ビットスケールヲソれぞれ屋
外ヤードに１ケ月集積し、水切りを行った後、ショベル
付耕耘機により混合集積した後、５日間天日乾燥を行う
と共に、その耕耘機によって混合撹拌し、含水率２１重
量％まで脱水した。該脱水した混合原料５０重量％、Ｃ
ａＯ含有製鋼ダスト５０重量％を内径２５００ｍｍの高
速撹拌型ミキサーに供給して分散混練させて充分混合し
た後、パレット内に１日間静置し自然養生を行った。養
生後、その含水率は８．３重量％であった。A scale, B scale, and bit scale were collected in an outdoor yard for one month, and after draining, they were mixed and collected using a tiller with a shovel, dried in the sun for five days, and mixed using the tiller. The mixture was stirred and dehydrated to a water content of 21% by weight. 50% by weight of the dehydrated mixed raw material, C
After 50% by weight of aO-containing steelmaking dust was supplied to a high-speed stirring type mixer with an inner diameter of 2500 mm and thoroughly mixed by dispersion and kneading, the mixture was allowed to stand in a pallet for one day for natural curing. After curing, its moisture content was 8.3% by weight.
上記養生後の造粒原料をパレットからホッパへ移し、テ
ーブルフィーダを用いて内径１５００ＩＩＩＩ１１深さ
２５０ ｍ ，回転数ＩＱｒｐｍのバンペレタイザーへ
毎時ＩＴで連続供給しながら、ＪＩＳ３号水ガラスを造
粒原料ｌ００重量％に対し６重量％を添加し、造粒後の
べレフト水分が１０〜１２重量％となるように調湿混棟
し、粒径１０〜１５叩のベレットを得た。The granulated raw material after the above curing is transferred from the pallet to the hopper, and is continuously fed using a table feeder to a van pelletizer with an inner diameter of 1500 m, depth of 250 m, and a rotational speed of IQ rpm. 6% by weight was added to the granulated pellets, and the humidity was controlled and mixed so that the pellet moisture content after granulation was 10 to 12% by weight to obtain pellets with a particle size of 10 to 15%.
該ペレットをパレット内に５日間静置し自然養生を行っ
た。養生後、その常温圧潰強度は１４．２ｋｇ／ペレッ
トであった。The pellets were allowed to stand in a pallet for 5 days for natural curing. After curing, the cold crush strength was 14.2 kg/pellet.
上記養生後のベレットをパレットから投入用シュートへ
移し、予熱パケット内の予め収納されているスクラップ
上へ投入した。The pellets after curing were transferred from the pallet to a charging chute, and placed on top of the scraps stored in advance in the preheating packet.
ついで、上部蓋を被せ、高温排ガス通人配管を接続して
、そのガスを咳パケット内に通人し、スクラップを２０
０〜３００℃に一次加熱後、高温排ガスの供給を停止し
、該予熱を行った予熱パケットを待機中の電気炉炉口上
へ搬送し、ベレット及びスクラップを該電気炉内に装入
し、７００〜９００℃に二次加熱し、ついで溶解作業を
行った。Next, cover the top lid, connect the hot exhaust gas pipe, and pass the gas into the cough packet.
After primary heating to 0 to 300°C, the supply of high-temperature exhaust gas is stopped, the preheated packet is transported to the furnace mouth of a waiting electric furnace, and the pellets and scraps are charged into the electric furnace. Secondary heating was performed to ~900°C, and then a melting operation was performed.
また、その溶解作業中において、集塵される製鋼ダスト
はベレット未使用時と比べ、特に増加したとは認められ
なかった。Furthermore, during the melting process, no particular increase in collected steelmaking dust was observed compared to when the pellets were not used.
なお、上記ペレットの一部を取出し、その熱処理後残留
強度及び常温圧潰強度の経日変化について、実施例ｌと
同一の方法で調査した。その結果を第４．第５図に示す
。A portion of the above pellets was taken out and the changes in residual strength after heat treatment and crushing strength at room temperature over time were investigated in the same manner as in Example 1. The results are shown in the 4th section. It is shown in FIG.
それらの図から明らかなように、実施例１と同様の傾向
を示している。As is clear from these figures, the same tendency as in Example 1 is shown.
実施例３
第１表に示すダスト，スケール類を用いて第３図に示す
工程により造粒処理し、予熱後電気炉で使用した。Example 3 The dust and scale shown in Table 1 were granulated according to the steps shown in FIG. 3, and after preheating, the particles were used in an electric furnace.
含油．含水スケールであるＡスケール，Ｂスケールとビ
ットスケールをそれぞれ屋外ヤードにｌヶ月集積し、水
切りを行った後、ショベル付耕耘機により混合集積した
後、５日間天日乾燥を行うと共に、その耕耘機によって
混合撹拌し、含水率２２重量％まで脱水した。該脱水し
た混合原料５０重量％、ＣａＯ含有製鋼ダスト５０重量
％を内径２５００！＋１１１１の高速撹拌型ミキサーに
供給して分散混練させて充分混合した後、パレット内に
ｌ日間静置し自然養生を行った。養生後、その含水率は
９．４重量％であった。Contains oil. Water-containing scales A scale, B scale, and bit scale were collected in an outdoor yard for one month, drained, and then mixed and collected using a tiller with a shovel.Then they were dried in the sun for five days, and the tiller The mixture was mixed and stirred to remove water to a moisture content of 22% by weight. 50% by weight of the dehydrated mixed raw material and 50% by weight of CaO-containing steelmaking dust were mixed into an inner diameter of 2500! After supplying the mixture to a high-speed stirring type mixer (+1111) and thoroughly mixing it by dispersing and kneading it, the mixture was allowed to stand in a pallet for 1 day for natural curing. After curing, its moisture content was 9.4% by weight.
上記養生後の混合原料９０重量％と乾燥スケールである
ショットスケール１０重量％をそれぞれコンベヤにより
混合槽長さ２５００ｍｍのバグミキサに供給し、分散混
合することで含水率８．５重量％の造粒原料とし、これ
を内径１５００ｍｍ， 深さ２５（ｈｍ， 回転数
１Ｏｒｐｍのバンベレタイザへ毎時ＩＴ で連続供給し
ながら、ＪＩＳ３号水ガラスを造粒原料１００重量％に
対し、７重量％を添加し、造粒後のべレフト水分が１３
〜ｌ４重量％となるように調湿混棟し、粒径１０〜１５
ｍｍのべレフトを得た。該ベレットをパレット内に５日
間静置し自然養生を行った。養生後、その常温圧潰強度
は１４．７ｋｇ／ペレットであった。90% by weight of the above-mentioned mixed raw material after curing and 10% by weight of shot scale, which is dry scale, are each supplied by a conveyor to a bag mixer with a mixing tank length of 2500 mm, and the granulated raw material has a water content of 8.5% by weight by dispersing and mixing. While continuously feeding this into a van beletizer with an inner diameter of 1500 mm, a depth of 25 (hm), and a rotation speed of 1 rpm, 7% by weight of JIS No. 3 water glass was added to 100% by weight of the granulation raw material, and the mixture was granulated. The left water content after is 13
Humidity control is mixed so that the concentration is ~14% by weight, and the particle size is 10-15.
A bereft of mm was obtained. The pellets were allowed to stand in a pallet for 5 days for natural curing. After curing, the cold crush strength was 14.7 kg/pellet.
上記養生後のべレフトをパレットから役入用シュートへ
移し、予熱パケット内の予め収納されているスクラップ
上へ投入した。After the above-mentioned curing, the left bereft was transferred from the pallet to a service chute and placed on top of the scraps stored in advance in the preheating packet.
ついで、上部蓋を被せ、高温排ガス通人配管を接続して
、そのガスを該パケット内に通人し、スクラップを２０
０〜３００℃に一次加熱し、その収納物を該電気炉に装
入後、７００〜９００℃に二次加熱し、ついで溶解作業
を行った。Then, cover the top lid, connect the high temperature exhaust gas passage pipe, let the gas pass through the packet, and collect the scrap for 20 minutes.
After primary heating to 0 to 300°C, the stored contents were charged into the electric furnace, secondarily heated to 700 to 900°C, and then a melting operation was performed.
また、その溶解作業中において、集塵される製鋼ダスト
はペレット未使用時と比べ、特に増加したとは認められ
なかった。Furthermore, during the melting process, no particular increase in collected steelmaking dust was observed compared to when no pellets were used.
なお、上記ペレットの一部を取出し、その熱処理後残留
強度及び常温圧潰強度の経日変化について、実施例ｌと
同一の方法で調査した。その結果を第４，第５図に示す
。A portion of the above pellets was taken out and the changes in residual strength after heat treatment and crushing strength at room temperature over time were investigated in the same manner as in Example 1. The results are shown in Figures 4 and 5.
それらの図から明らかなように、実施例１と同様の傾向
を示している。As is clear from these figures, the same tendency as in Example 1 is shown.
なお、本実施例においては、乾燥スケールを含油７ 含
水スケールとＣａＯ含有製鋼ダストとを混練．養生後に
添加したが、その含油，含水スケールの脱水時に添加し
てもよい。In this example, the dry scale was mixed with oil-containing 7, and the water-containing scale and CaO-containing steelmaking dust were kneaded. Although it was added after curing, it may also be added during dehydration of the oil- and water-containing scale.
比較例
バインダとして本発明の水ガラスに代え、セメント系バ
インダを用いて本発明の第３実施例の処理工程によりペ
レットを聾造し、予熱後電気炉で使用した。なお、セメ
ント系バインダにはボルトランドセメントを用い、造粒
原料１００重量％に対しｌ５重量％を添加した。Comparative Example Pellets were molded into pellets according to the processing steps of the third embodiment of the present invention using a cement-based binder instead of the water glass of the present invention as a binder, and were used in an electric furnace after preheating. Note that Boltland cement was used as the cement binder, and 15% by weight was added to 100% by weight of the granulation raw material.
また、本発明の各実施例と同様に、上記ペレットの一部
を取出し、その熱処理後残留強度及び常温圧潰強度の経
日変化について調査した。その結果を第４．第５図に示
す。In addition, in the same manner as in each of the Examples of the present invention, some of the pellets were taken out and the residual strength after heat treatment and the change in cold crushing strength over time were investigated. The results are shown in the 4th section. It is shown in FIG.
第４図から熱処理後残留強度は常温時５．９ｋｇ／ペレ
フトから３００℃で８．４ｋｇ／ペレットとやや増加す
るものの３００℃を超えると１． ９ ｋｇ ／ペレッ
トと大幅に低下し、９００℃でも２．１ｋｇ／ベレット
とほば横這いであり、加熱後はハンドリングに耐え得な
い。Figure 4 shows that the residual strength after heat treatment increases slightly from 5.9 kg/pellet at room temperature to 8.4 kg/pellet at 300°C, but increases to 1. The weight decreased significantly to 9 kg/pellet, and remained almost unchanged at 2.1 kg/pellet even at 900°C, and could not withstand handling after heating.
また、その溶解作業中において、集塵される製鋼ダスト
は、ペレット未使用時と比べ、増加したことが認められ
た。その理由として、加熱されることでセメント系バイ
ンダから急速に水分が消失してその強度を維持できず、
さらに高温ガスに吹き曝されて急激に粉化するためと推
測される。Additionally, during the melting process, it was observed that the amount of steelmaking dust collected increased compared to when no pellets were used. The reason for this is that water rapidly disappears from the cement binder when heated, making it impossible to maintain its strength.
It is also assumed that this is because it is rapidly pulverized when exposed to high-temperature gas.
マタ、第５図からセメント系バインダは養生日数が長く
なる程常温圧潰強度は増加する傾向があり、これはペレ
ットの強度はセメントの水硬性に大きく依存しているた
めと考えられ、本発明のように造粒原料の戊分と水ガラ
スの反応による硬化機構とは全く異なるものである。Mata, from Figure 5, the room temperature crushing strength of cement-based binders tends to increase as the curing time increases, and this is thought to be because the strength of the pellets largely depends on the hydraulic properties of cement. The curing mechanism is completely different from the reaction between the granulation raw material and water glass.
本発明によって以下の効果を奏することができる。 The following effects can be achieved by the present invention.
（１） 製鋼ダストに事前に水又は含水スケールを混
合し、その製鋼ダストが含有するＣａＯを永和反応によ
り消化し安定化すると共に、バインダに水ガラスを用い
ることで永和反応により生戊した水和物が水ガラスの硬
化反応により短時間に必要な圧潰強度を得られる上、そ
れによるペレットは予熱炉内において加熱されることで
圧潰強度が更に増加すると共に、予熱用の熱風に吹き曝
されても粉化しないという相乗効果がある。(1) Water or water-containing scale is mixed in advance with steelmaking dust, and the CaO contained in the steelmaking dust is digested and stabilized by the Eiwa reaction, and the hydration produced by the Eiwa reaction is achieved by using water glass as a binder. The necessary crushing strength can be obtained in a short time by the hardening reaction of water glass, and the resulting pellets are heated in a preheating furnace to further increase the crushing strength, and are exposed to hot air for preheating. It also has a synergistic effect of not turning into powder.
（２） 早期に必要な圧潰強度が発現するので、造粒
後のペレットの養生スペースを大幅に削減できる。(2) Since the necessary crushing strength is developed early, the curing space for pellets after granulation can be significantly reduced.
（３） 電気炉製鋼工場等から発生するダスト，スケ
ール類の性状，粒度分布等が異なるものを混合し、造粒
原料としてそれぞれが補完し合うことで、緻密なペレッ
トを得られ、その全量を有効に再利用できる。(3) Dense pellets can be obtained by mixing dust and scales with different properties, particle size distributions, etc. generated from electric furnace steel plants, etc., and complementing each other as granulation raw materials. Can be effectively reused.
第１図〜第３図は本発明の各実施例における処理工程図
を示す。第４図は各実施例と比較例により処理したべレ
フトの熱処理後残留強度を示す図を示す。第５図は各実
施例と比較例により処理したべレフトの常温圧潰強度の
経日変化を示す図、第６図はペレットの熱処理後残留強
度を調べるためのエレマ電気炉の加熱パターンを示す図
である。1 to 3 show processing steps in each embodiment of the present invention. FIG. 4 shows a diagram showing the residual strength after heat treatment of the belefts treated according to each example and comparative example. Figure 5 is a diagram showing the change over time in the room temperature crushing strength of pellets treated according to each example and comparative example, and Figure 6 is a diagram showing the heating pattern of the Elema electric furnace for examining the residual strength of pellets after heat treatment. It is.
Claims (1)
養生し、造粒原料とする工程と、該造粒原料１００重量
％に対し、３〜７重量％の水ガラスを添加し、調湿混棟
して造粒し、養生する工程と、 該養生後の造粒物をスクラップを収納した予熱炉内に投
入し、スクラップ予熱温度まで加熱した後、スクラップ
と共に電気炉内に装入する工程とからなることを特徴と
するスクラップ予熱炉を有する電気炉における製鋼ダス
ト類の再利用方法。 ２、請求項１の記載において、造粒原料とする工程が、
ＣａＯ含有製鋼ダストに含水率５０重量％以下に脱水し
た含油、含水スケールを混合し養生するスクラップ予熱
炉を有する電気炉における製鋼ダスト類の再利用方法。 ３、請求項１の記載において、造粒原料とする工程が、
ＣａＯ含有製鋼ダストと、含水率５０重量％以下に脱水
した含油、含水スケールとを混合し、養生した後、該養
生物と乾燥スケールとを混合するスクラップ予熱炉を有
する電気炉における製鋼ダスト類の再利用方法。[Scope of Claims] 1. A step of curing CaO-containing steelmaking dust by adding water while stirring to obtain a granulation raw material, and adding 3 to 7% by weight of water glass based on 100% by weight of the granulation raw material. The granulated material after curing is put into a preheating furnace containing scrap, heated to the scrap preheating temperature, and then put into an electric furnace together with the scrap. 1. A method for reusing steelmaking dust in an electric furnace having a scrap preheating furnace, the method comprising: charging the steelmaking dust into the electric furnace. 2. In the description of claim 1, the step of making the raw material for granulation comprises:
A method for reusing steelmaking dust in an electric furnace having a scrap preheating furnace for mixing and curing oil- and water-containing scale dehydrated to a water content of 50% by weight or less with CaO-containing steelmaking dust. 3. In the description of claim 1, the step of making the raw material for granulation comprises:
After mixing CaO-containing steelmaking dust and oil- and water-containing scale dehydrated to a moisture content of 50% by weight or less and curing, steelmaking dust is mixed in an electric furnace with a scrap preheating furnace that mixes the curing agent and dry scale. How to reuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18825089A JP2706142B2 (en) | 1989-07-19 | 1989-07-19 | Recycling method of steelmaking dusts in electric furnace with scrap preheating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18825089A JP2706142B2 (en) | 1989-07-19 | 1989-07-19 | Recycling method of steelmaking dusts in electric furnace with scrap preheating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0353029A true JPH0353029A (en) | 1991-03-07 |
| JP2706142B2 JP2706142B2 (en) | 1998-01-28 |
Family
ID=16220409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18825089A Expired - Lifetime JP2706142B2 (en) | 1989-07-19 | 1989-07-19 | Recycling method of steelmaking dusts in electric furnace with scrap preheating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2706142B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005282074A (en) * | 2004-03-29 | 2005-10-13 | Shin Caterpillar Mitsubishi Ltd | Recyclable counterweight and method of manufacturing the same |
| JP2005282090A (en) * | 2004-03-29 | 2005-10-13 | Shin Caterpillar Mitsubishi Ltd | Recyclable counterweight and method of manufacturing the same |
| KR100537665B1 (en) * | 2002-05-15 | 2005-12-19 | 주식회사 케이.알.티 | Method for preparing pellet to recycle byproduct from stainless steel manufacturing processes and pellet prepared therefrom |
| JP2009007645A (en) * | 2007-06-28 | 2009-01-15 | Daido Steel Co Ltd | Method for manufacturing granulated material of metal-containing by-product, and granulation equipment |
| JP2010172812A (en) * | 2009-01-28 | 2010-08-12 | Sanyo Special Steel Co Ltd | Method for decreasing elution amount of heavy metal of steelmaking dust |
| CN102628099A (en) * | 2012-05-09 | 2012-08-08 | 长沙矿冶研究院有限责任公司 | Method for forming balls by cooling and solidifying mineral powder by using water glass as bonding agent |
| CN106148685A (en) * | 2016-07-28 | 2016-11-23 | 重庆大学 | A kind of municipal sludge and iron-containing waste prepare the method for acid pellet |
| JP2019090095A (en) * | 2017-11-16 | 2019-06-13 | 株式会社片山化学工業研究所 | Method for producing iron-making dust agglomerate, and agglomeration assistant |
-
1989
- 1989-07-19 JP JP18825089A patent/JP2706142B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100537665B1 (en) * | 2002-05-15 | 2005-12-19 | 주식회사 케이.알.티 | Method for preparing pellet to recycle byproduct from stainless steel manufacturing processes and pellet prepared therefrom |
| JP2005282074A (en) * | 2004-03-29 | 2005-10-13 | Shin Caterpillar Mitsubishi Ltd | Recyclable counterweight and method of manufacturing the same |
| JP2005282090A (en) * | 2004-03-29 | 2005-10-13 | Shin Caterpillar Mitsubishi Ltd | Recyclable counterweight and method of manufacturing the same |
| JP2009007645A (en) * | 2007-06-28 | 2009-01-15 | Daido Steel Co Ltd | Method for manufacturing granulated material of metal-containing by-product, and granulation equipment |
| JP2010172812A (en) * | 2009-01-28 | 2010-08-12 | Sanyo Special Steel Co Ltd | Method for decreasing elution amount of heavy metal of steelmaking dust |
| CN102628099A (en) * | 2012-05-09 | 2012-08-08 | 长沙矿冶研究院有限责任公司 | Method for forming balls by cooling and solidifying mineral powder by using water glass as bonding agent |
| CN106148685A (en) * | 2016-07-28 | 2016-11-23 | 重庆大学 | A kind of municipal sludge and iron-containing waste prepare the method for acid pellet |
| JP2019090095A (en) * | 2017-11-16 | 2019-06-13 | 株式会社片山化学工業研究所 | Method for producing iron-making dust agglomerate, and agglomeration assistant |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2706142B2 (en) | 1998-01-28 |
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