JPH0791097B2 - Method for removing salt, etc. from steelmaking dust - Google Patents
Method for removing salt, etc. from steelmaking dustInfo
- Publication number
- JPH0791097B2 JPH0791097B2 JP24045891A JP24045891A JPH0791097B2 JP H0791097 B2 JPH0791097 B2 JP H0791097B2 JP 24045891 A JP24045891 A JP 24045891A JP 24045891 A JP24045891 A JP 24045891A JP H0791097 B2 JPH0791097 B2 JP H0791097B2
- Authority
- JP
- Japan
- Prior art keywords
- pellets
- dust
- salt
- steelmaking
- water
- 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
- 239000000428 dust Substances 0.000 title claims description 40
- 238000009628 steelmaking Methods 0.000 title claims description 33
- 150000003839 salts Chemical class 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 15
- 239000008188 pellet Substances 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000003860 storage Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 7
- 238000003475 lamination Methods 0.000 claims description 2
- 235000002639 sodium chloride Nutrition 0.000 description 32
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 238000007654 immersion Methods 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 3
- 238000010612 desalination reaction Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、製鋼ダストの塩分等
の除去方法に関し、特に簡単かつ確実に塩分等を除去で
きるようにした方法に関する。FIELD OF THE INVENTION The present invention relates to the salt content of steelmaking dust.
The present invention relates to a method for removing salt and the like particularly easily and surely.
【０００２】[0002]
【従来の技術】製鋼炉からは酸化鉄を主体とするダスト
が多量に発生するので、環境保全上からも、これをどの
ように処理するかが従来から重要な問題となっている。2. Description of the Related Art Since a large amount of iron oxide-based dust is generated from a steelmaking furnace, it has been an important issue from the environmental protection point of view how to treat the dust.
【０００３】従来、製鋼ダストの処理方法の１つとし
て、セメントの鉄源として利用することが提案されてい
た。Conventionally, as one of the methods for treating steelmaking dust, it has been proposed to use it as an iron source for cement.
【０００４】[0004]
【発明が解決しようとする課題】他方、最近のコンクリ
ート構造物においては、コンクリートに割れが発生する
ことが社会問題化しつつあり、その原因がセメント材料
中に含まれる海砂利からの塩分（ＮａＣｌ）であること
が指摘されていたが、上述の製鋼ダストをセメントの鉄
源として利用する場合にも塩分を含むものは拒否される
現状にあり、その対策が望まれていた。On the other hand, in recent concrete structures, cracking of concrete is becoming a social problem, and the cause thereof is salt (NaCl) from sea gravel contained in cement materials. However, even when the above-mentioned steelmaking dust is used as an iron source for cement, the one containing salt is currently rejected, and a countermeasure for it has been desired.
【０００５】通常、製鋼工程においては塩分は添加元素
や不純物等としては含まれておらず、製鋼ダストにも本
来塩分は含まれていないのであるが、海に近い工場の場
合、空気中に多量の海塩粒子が漂っており、該海塩粒子
が原材料、例えばスクラップに付着して製鋼炉内に持ち
込まれ、ダストとともに排出されるものである。なお、
製鋼ダストの成分分析値の例を表１に示した。この場
合、塩素は１．７〜１．２重量％、ＮａＣｌにして４．
３〜３．０％も含んでいる。また、製鋼ダスト中には６
価クロムが一般鋼の場合で５〜６ｍｇ／ｌ、ステンレス
鋼の場合には約１００ｍｇ／ｌ程度含有され、人体に有
害であることから、その含有量が法的に１．５ｍｇ／ｌ
未満に規制され、厳しい場合には例えば姫路市条例のよ
うに０．５ｍｇ／ｌ以下であることが要求される。Normally, in the steelmaking process, salt is not contained as additive elements or impurities, and steelmaking dust does not originally contain salt, but in the case of a factory near the sea, a large amount of salt is contained in the air. The sea salt particles of No. 1 are drifting, the sea salt particles adhere to raw materials, for example, scrap, are brought into the steelmaking furnace, and are discharged together with dust. In addition,
Table 1 shows examples of component analysis values of steelmaking dust. In this case, chlorine is 1.7 to 1.2 % by weight, and NaCl is 4.
It also contains 3 to 3.0 %. Also, 6 in steelmaking dust
5 to 6 mg / l when valent chromium is general steel, stainless steel
In the case of steel, it is contained in about 100 mg / l and
Since it is harmful, its content is legally 1.5 mg / l.
It is regulated to be less than, and in severe cases, for example, the Himeji City Ordinance
As such, it is required to be 0.5 mg / l or less .
【０００６】[0006]
【表１】 [Table 1]
【０００７】ところで、製鋼ダストから塩分や６価クロ
ムを除去する方法としては、製鋼ダストをペレットにし
た上で水槽にどぶ漬にする方法が考えられるが、ペレッ
ト中には多量の粉状部分が含まれ、又ハンドリング中や
浸漬中にペレットが粉化しやすいことから、これが汚泥
として水槽底部に多量に沈澱し、その処理が非常に煩雑
になるという不具合が生じる。By the way, salt and hexavalent black are produced from steelmaking dust.
As a method of removing the steel, a method of making steel dust into pellets and then immersing it in a water tank can be considered.However, the pellets contain a large amount of powdery parts, and the pellets may be removed during handling or dipping. Since it is easily pulverized, a large amount of this sludge settles on the bottom of the water tank as sludge, and the treatment thereof becomes very complicated.
【０００８】この発明は、かかる点に鑑み、ダスト中の
塩分等を簡単かつ確実に除去できるようにした製鋼ダス
トの塩分等の除去方法を提供することを課題とする。In view of such a point, the present invention has
An object of the present invention is to provide a method for removing salt and the like from steelmaking dust, which is capable of easily and reliably removing salt and the like .
【０００９】[0009]
【課題を解決するための手段】そして本件発明者らは、
たまたま屋外に製鋼ダストのペレットを集積しておいた
ところ、雨水等の作用によってダスト中の塩分が低くな
っていたことを発見した。従って製鋼ダストのペレット
を積み上げ、そこに撒水すれば、ダスト中の塩分等を簡
単かつ確実に除去できるのではないかと考え、本発明を
完成した。[Means for Solving the Problems] The inventors of the present invention
It happened that pellets of steelmaking dust were collected outdoors, and it was discovered that the salt content in the dust was low due to the action of rainwater. Therefore, it was thought that salt and the like in the dust could be easily and surely removed by stacking pellets of steelmaking dust and sprinkling the pellets on the pellets, and completed the present invention.
【００１０】即ち、本発明に係る製鋼ダストの塩分等の
除去方法は、「製鋼炉から発生するダストをペレットに
造粒し、該ペレットを床面を僅かに傾斜させるか又は排
水溝をつけた置き場に搬入して積層し、該積層ペレット
上から撒水を行って積層中に水を流下させる」ことを要
旨とする。That is, the salt content of the steelmaking dust according to the present invention
The removal method is: "Dust generated from a steelmaking furnace is granulated into pellets, the floor surfaces are slanted slightly or they are carried into a storage place with a drainage groove and stacked, and sprinkling water is applied from above the stacked pellets. The main idea is to "go and let water flow down during lamination".
【００１１】ここでペレットは、粒径２ｍｍ未満では粉
状成分と同様の挙動をとる一方、粒径１０ｍｍを越える
と脱塩に時間がかかり、又運搬中に壊れやすくなること
から、２〜１０ｍｍ、好ましくは３〜５ｍｍに造粒する
のがよい。また、撒水は５０〜３００ｋｇ／ｍ2 ／Ｈｒ
の撒水量で６日〜２０日間行うのがよい。When the particle size is less than 2 mm, the pellet behaves like a powdery component, whereas when the particle size exceeds 10 mm, desalting takes a long time and is easily broken during transportation. , Preferably 3 to 5 mm. Further, sprinkling water is 50 to 300 kg / m 2 / Hr
It is recommended that the watering amount be 6 to 20 days.
【００１２】[0012]
【作用】本発明においては、製鋼ダストをペレットにし
て積み上げ、その上から撒水するようにしたので、排水
中に粉状ダストが流出せず、初期の短時間を除き、殆ど
濁りがない。その間、水はペレットの表面をゆっくり流
下して行き、ペレット中に浸み込んだ水分中の濃度勾配
によって塩分等が表面に移動し、洗い流される。これに
対し、単なる水中浸漬の場合は除去効果は代わらない
が、排水中に多量に粉が流出し、さらに浸漬槽中に汚泥
がたまってその処理に困ることとなる。In the present invention, since the steelmaking dust is piled up and piled up and sprinkled, the powdery dust does not flow out into the drainage and there is almost no turbidity except in the initial short time. Meanwhile, water slowly flows over the surface of the pellet.
Concentration gradient in water that went down and penetrated into the pellet
As a result, salt etc. moves to the surface and is washed away. to this
On the other hand, in the case of mere immersion in water , the removal effect is not changed, but a large amount of powder flows out into the drainage, and further sludge accumulates in the immersion tank, which makes it difficult to treat.
【００１３】即ち、製鋼ダストのペレットは水分の存在
下でダスト中の成分ＭｇＯに起因して時間の経過ととも
に強固に固化する。水中浸漬の場合、まだよく固化しな
い間にハンドリングするので、粉化が多くなるが、本発
明の場合は充分な時間を置いてハンドリングするので、
充分固化しており、容易に粉化しない。なお、有害成分
中最も除去しにくいのは比較的水に溶けにくい塩分であ
って、 人体にとって有害な６価クロムは水に極めて溶け
易いので、実施の初期に殆んど除去される。 That is, the pellets of steelmaking dust solidify with the passage of time due to the component MgO in the dust in the presence of water. In the case of immersion in water, since it is handled while it does not solidify well, powdering will increase, but in the case of the present invention, it will be handled after a sufficient time.
It is sufficiently solidified and does not easily powder. In addition, harmful ingredients
The most difficult to remove is the salt, which is relatively insoluble in water.
Hexavalent chromium, which is harmful to the human body, is extremely soluble in water.
Since it is easy, it is mostly removed in the early stage of implementation.
【００１４】[0014]
【実施例】以下、本発明を図面に示す具体例に基づいて
詳細に説明する。図１ないし図３は本発明の一実施例に
よる製鋼ダストの塩分等の除去方法を示す。製鋼工場内
の一部に塩分等の除去ヤード２が設けられ、該塩分等の
除去ヤード２には仕切り壁である外壁２０及び区画壁２
１が設けられて第１〜第３の置き場２２、２３、２４が
構成され、各置き場ごとに搬入、撒水及び水切り・出荷
のサイクルが置き場によって時間をずらせて行われる。
なお、本実施例では各置き場の面積は約２４０ｍ2 であ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the specific examples shown in the drawings. 1 to 3 show a method of removing salt and the like from steelmaking dust according to an embodiment of the present invention. Removal yard 2 of salt or the like is provided on a portion of the steel mill, the outer wall 20 and the partition wall 2 to remove yards 2 such as the salt is a partition wall
1 is provided to form first to third storage areas 22, 23, 24, and the cycle of carrying in, sprinkling water and draining / shipping is performed at each storage area at different times.
In this example, the area of each storage area is about 240 m 2 .
【００１５】また、上記置き場２２〜２４の床面は若干
前方が低くなるように形成され、該置き場の手前側には
置き場に沿って排水溝２５が形成され、排水は排水槽２
６、排水パイプ（図示せず）及びポンプを経て排水処理
設備（図示しない）に送られる。The floors of the storage areas 22 to 24 are formed so that the front thereof is slightly lower, and a drain groove 25 is formed along the storage area on the front side of the storage areas to drain the waste water from the drain tank 2.
6. It is sent to a wastewater treatment facility (not shown) via a drainage pipe (not shown) and a pump.
【００１６】各置き場の上方には６個の撒水ノズル２８
が背面仕切り壁の後方からアームにより支持付設されて
おり、シャワー状に撒水する。Six sprinkling nozzles 28 are provided above each storage area.
Is attached by an arm from the rear of the rear partition wall, and water is sprinkled in the shape of a shower.
【００１７】次に図１を用いて製鋼ダストの塩分等の除
去方法について説明する。Next, referring to FIG. 1, the salt content of steelmaking dust is removed.
The method of leaving is explained.
【００１８】製鋼炉からのダストが集塵機で集塵される
と（ステップＳ１参照）、該製鋼ダストを造粒機に送給
し、水を加えて粒径２〜１０ｍｍのペレットに造粒する
（ステップＳ２参照）。造粒には鉄鉱石粉をペレット化
するペレタイザ、例えば小型の傾斜皿状ペレタイザを使
用できる。ペレット化された製鋼ダストは置き場２２〜
２４内に運搬して積んでおく（ステップＳ３参照）。When the dust from the steelmaking furnace is collected by the dust collector (see step S1), the steelmaking dust is fed to the granulator, and water is added to granulate the pellets with a particle diameter of 2 to 10 mm ( See step S2). For granulation, a pelletizer that pelletizes iron ore powder, for example, a small inclined dish pelletizer can be used. The pelletized steelmaking dust is stored in the storage area 22 ~
It is transported and loaded in the stack 24 (see step S3).
【００１９】ペレット３が置き場内に高さ１〜２ｍ程
度、即ち２００〜４００ｍ3 （３００〜６００ｔｏｎ）
程度積み上げられると、６箇所の撒水ノズル２８から５
０〜３００ｋｇ／ｍ2 ／Ｈｒの量で撒水する。水はペレ
ットの表面をゆっくり流れ下り、ペレットの表面の塩分
や６価クロム等を吸収するが、時間と共にペレット中の
塩分や６価クロム等も濃度拡散で表面に移動し、次第に
水中に吸収される。塩分等を含む排水は置き場の手前の
排水溝２５を経て排水処理設備に送られる。The height of the pellets 3 is about 1 to 2 m in the storage space, that is, 200 to 400 m 3 (300 to 600 ton).
When piled up, the watering nozzles 28 can
Water is sprinkled in an amount of 0 to 300 kg / m 2 / Hr. Water slowly flows down the surface of the pellets, removing salt from the pellets.
And hexavalent chromium, etc. are absorbed, but with time, salt in the pellet, hexavalent chromium, etc. also move to the surface due to concentration diffusion, and are gradually absorbed in water. Wastewater containing salt and the like is sent to the wastewater treatment facility through the drainage groove 25 in front of the storage site.
【００２０】こうして６日〜２０日が経過すると、ペレ
ット内の塩分や６価クロム等はほぼ除去されているの
で、撒水を停止し、１０日程度放置して水切りを行い、
水分がほぼなくなると、搬出し、セメント原料として出
荷する。After 6 to 20 days, since the salt and hexavalent chromium in the pellets are almost removed, the sprinkling is stopped, and the pellets are left for about 10 days for draining.
When the water content is almost gone, it is taken out and shipped as a cement raw material.
【００２１】このようにして各置き場２２〜２４毎に、
搬入、撒水及び水切り・出荷の各作業を行う。表２に実
施の具体例と低合金鋼溶製時ダストの塩分及びステンレ
ス鋼の場合の６価クロムについて成績を示す。In this way, for each storage area 22-24,
Carrying in, sprinkling, draining, and shipping work. Table 2 shows concrete examples of implementation and salt content and stainless steel dust of low alloy steel.
The results are shown for hexavalent chromium in the case of stainless steel .
【００２２】[0022]
【表２】 [Table 2]
【００２３】脱塩度はＣｌ-1の分析によって測定した。
ここで、ペレットの平均粒径は４ｍｍ、積み上げ高さは
２ｍで、嵩容量は４００ｍ3 （略６００ｔｏｎ）、撒水
量は８０〜２００ｋｇ／ｍ2 ／Ｈｒ、撒水期間は７〜１
４日とした。塩分等の除去処理前の製鋼ダスト中の塩分
はＣｌに換算して１．７％であったのに対し、処理後に
は０．０１〜０．０５％になっていることが確認され
た。また、ステンレス鋼の製鋼ダストについて本処理を
行ってその成績、特に６価クロムの含有量を計量した。
除去処理前のステンレス鋼の製鋼ダスト中には６価クロ
ムが１００ｍｇ／ｌ近くあったのが、除去処理後には
０．２ｍｇ／ｌ以下になっていることが確認された。 Desalination was measured by analysis of Cl -1 .
Here, the average particle diameter of the pellets is 4 mm, the stacking height is 2 m, the bulk capacity is 400 m 3 (approximately 600 tons), the sprinkling amount is 80 to 200 kg / m 2 / Hr, and the sprinkling period is 7 to 1
It was 4 days. It was confirmed that the salt content in the steelmaking dust before the salt removal treatment was 1.7% in terms of Cl, whereas it was 0.01 to 0.05% after the treatment. In addition, this treatment is applied to the steelmaking dust of stainless steel.
The results, especially the content of hexavalent chromium, were measured.
In the steelmaking dust of stainless steel before the removal treatment, hexavalent black
The amount was about 100 mg / l, but after the removal treatment
It was confirmed that the concentration was 0.2 mg / l or less.
【００２４】[0024]
【発明の効果】本発明の実施により、従来、脱塩の為に
水中浸漬等のコストの高い方法によっていたか、あるい
は脱塩コストが高い為、産業廃棄物として処分していた
塩分の高い製鋼ダストが、きわめて簡便でコストの安い
方法で脱塩できるようになり、セメント原料として活用
できるようになった。例えば、中規模の電気炉製鋼工場
では、製鋼ダストの量は月間１０００ｔｏｎ以上にもな
り、これが廃棄されずに有用に活用されるようになった
ことは環境保護の上からも貢献度は大きい。また、人体
に有害な６価クロムについても規制量以下にできた。As a result of the practice of the present invention, steelmaking with high salinity, which has been disposed as industrial waste, has hitherto been carried out by a high cost method such as immersion in water for desalination, or because of high desalination cost. Dust can be desalted by an extremely simple and inexpensive method, and can be used as a cement raw material. For example, in a medium-scale electric furnace steelmaking plant, the amount of steelmaking dust is 1000 tons or more per month, and the fact that the dust is used effectively without being discarded makes a great contribution from the viewpoint of environmental protection. Also the human body
The amount of hexavalent chromium, which is harmful to the environment, was reduced to below the regulated amount .
【図１】 本発明の一実施例による製鋼ダストの塩分等
の除去方法を示す工程図である。 FIG. 1 is a salt content of steelmaking dust according to an embodiment of the present invention .
FIG. 6 is a process drawing showing a removal method of the above.
【図２】 塩分等の除去 に使用される置き場の平面図で
ある。 FIG. 2 is a plan view of a storage space used for removing salt and the like .
【図３】 置き場の正面図である。 FIG. 3 is a front view of a storage space.
２０ 外壁 ２１ 区画壁 ２２ 置き場 ２３ 置き場 ２４ 置き場 ２８ 撒水ノズル ３ 製鋼ペレット 20 Outer wall 21 Partition wall 22 Storage space 23 Storage space 24 Storage space 28 Sprinkling nozzle 3 Steel pellets
Claims (2)
造粒し、 該ペレットを床面を僅かに傾斜させるか又は排水溝をつ
けた置き場に搬入して積層し、 該積層ペレット上から撒水を行って積層中に水を流下さ
せることを特徴とする製鋼ダストの塩分等の除去方法。1. Dust generated from a steelmaking furnace is granulated into pellets, the pellets are slanted slightly on the floor, or the pellets are carried into a storage place with a drainage groove and stacked, and sprinkling water is applied from above the stacked pellets. A method for removing salts and the like of steelmaking dust, which comprises performing water flow during lamination.
し、 上記撒水を５０〜３００ｋｇ／ｍ2 ／Ｈｒの撒水量で６
日〜２０日間行うことを特徴とする請求項１記載の製鋼
ダストの塩分等の除去方法。2. The pellets are granulated to have a particle size of 2 to 10 mm, and the sprinkling water is sprinkled at a sprinkling amount of 50 to 300 kg / m 2 / Hr.
The method for removing salt and the like from steelmaking dust according to claim 1, wherein the method is carried out for 1 day to 20 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24045891A JPH0791097B2 (en) | 1991-08-26 | 1991-08-26 | Method for removing salt, etc. from steelmaking dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24045891A JPH0791097B2 (en) | 1991-08-26 | 1991-08-26 | Method for removing salt, etc. from steelmaking dust |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0558686A JPH0558686A (en) | 1993-03-09 |
| JPH0791097B2 true JPH0791097B2 (en) | 1995-10-04 |
Family
ID=17059803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24045891A Expired - Lifetime JPH0791097B2 (en) | 1991-08-26 | 1991-08-26 | Method for removing salt, etc. from steelmaking dust |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0791097B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4907284B2 (en) * | 2006-09-28 | 2012-03-28 | 住友大阪セメント株式会社 | Method for processing ferrous waste materials |
| JP2010172812A (en) * | 2009-01-28 | 2010-08-12 | Sanyo Special Steel Co Ltd | Method for decreasing elution amount of heavy metal of steelmaking dust |
-
1991
- 1991-08-26 JP JP24045891A patent/JPH0791097B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0558686A (en) | 1993-03-09 |
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