JPH08182977A - Removal of chloride from sintering machine dust - Google Patents

Removal of chloride from sintering machine dust

Info

Publication number
JPH08182977A
JPH08182977A JP6337768A JP33776894A JPH08182977A JP H08182977 A JPH08182977 A JP H08182977A JP 6337768 A JP6337768 A JP 6337768A JP 33776894 A JP33776894 A JP 33776894A JP H08182977 A JPH08182977 A JP H08182977A
Authority
JP
Japan
Prior art keywords
dust
sintering machine
chloride
slurry
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.)
Granted
Application number
JP6337768A
Other languages
Japanese (ja)
Other versions
JP3120679B2 (en
Inventor
Teruji Sasaki
輝司 佐々木
Yutaka Yamada
裕 山田
Hiroshi Fukuyo
寛 福与
Toshiaki Nakano
稔陽 中野
Shigekichi Tazaki
重吉 田崎
Shiro Kaneko
四郎 金子
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP06337768A priority Critical patent/JP3120679B2/en
Publication of JPH08182977A publication Critical patent/JPH08182977A/en
Application granted granted Critical
Publication of JP3120679B2 publication Critical patent/JP3120679B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Landscapes

  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

PURPOSE: To remove chloride with high efficiency from sintering machine dust by adding the sintering machine dust to injection fluid of two flows, i.e., high- pressure water and air, to prepare a slurry and sufficiently eluting the chloride therefrom with a thickener, then thickening and dehydrating the slurry. CONSTITUTION: The high-pressure water 30 is injected into a vessel 34 via a nozzle 33 from one end of the vessel 34 by a two-fluid slurry machine 35. The air 32 is sucked therein by the negative pressure generated at this time while a valve 31 is adjusted to form two-fluid jets. The sintering machine dust 3 is easily slurried if the sintering machine dust 3 is added to the two-fluid jets in the vessel 34 from a hopper 36 while the delivery rate is adjusted by a delivery device 37. This slurry is transported via a pump to a washing thickener 16 where the chloride is sufficiently eluted into the aq. soln. Further, the aq. soln. and the sintering machine dust 3 are sent to a thickener 18 where the sintering machine dust 3 is settled and separated; thereafter, the moisture is removed from the dust by a dehydrating machine 20 to form cake 22. The pressure of the high-pressure water is set at >=40kgf/cm<2> and the weight ratio of the dust with respect to the weight 1 of the high-pressure water is set at <=0.2.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、製鉄所の焼結機の主排
風装置の前に設置されている電気集塵機に補集される焼
結機ダストからの塩化物の除去方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing chlorides from sinter dust collected by an electric dust collector installed in front of a main exhaust device of a sinter machine at an iron mill.

【0002】[0002]

【従来の技術】本発明は、一般に焼結機から排出される
排気ガスには鉄鉱石を主成分とする多量のダストを含ん
でいるため、排風機の吸い込み側に焼結主排風機用電気
集塵機を設け、その排ガスから上記ダストの除塵を行っ
ていることは知られている。しかし、この電気集塵機に
より補修された焼結機ダストは未だ多くの鉄分を含んで
おり、また、このダストは焼結鉱1ton当たり1.5
kgにも達するため、資源として再利用することが望ま
れている。
2. Description of the Related Art In the present invention, since the exhaust gas discharged from a sintering machine generally contains a large amount of dust containing iron ore as a main component, an electric power for a main exhaust machine for sintering is installed on the suction side of the exhaust machine. It is known that a dust collector is provided to remove the dust from the exhaust gas. However, the sinter dust repaired by this electrostatic precipitator still contains a large amount of iron, and the dust is 1.5 ton per sinter ore.
Since it reaches as much as kg, it is desired to reuse it as a resource.

【0003】しかし、このダストは一方においてNa、
K等のアルカリ金属成分と塩素との化合物即ち、塩化物
を多量に含有しているので、焼結用原料として、そのま
ま再利用することは望ましくない。即ち、何らの処理を
せず、そのまま焼結鉱原料として電気集塵機ダストを再
利用すると、アルカリ金属成分が次第に濃縮され、これ
に従って電気抵抗が高くなり、電気集塵機の集塵効率を
大きく低下させるという問題がある。
However, this dust, on the one hand, is Na,
Since it contains a large amount of a compound of an alkali metal component such as K and chlorine, that is, chloride, it is not desirable to reuse it as a raw material for sintering. That is, if the electrostatic precipitator dust is reused as it is as a raw material for sinter without any treatment, the alkali metal component is gradually concentrated, and accordingly the electric resistance is increased, and the dust collection efficiency of the electrostatic precipitator is greatly reduced. There's a problem.

【0004】また、前述の塩化物を多く含有する前記ダ
ストをそのまま焼結鉱原料して使用した場合、焼結鉱中
の塩化物の濃度が高くなり、そのため鉱石の還元粉化性
を悪化させる。しかしながら従来の方法において、この
ダストから塩化物を除去することは経済的理由のため
に、そのままで再利用されているか、若しくは前述した
問題を解決するためにダストに水を添加してスラリー化
した後、シックナー等を用いて濃縮し、脱水機に送り、
脱水ケーキを作る処理方法を行っているのが現状であ
る。
When the above-mentioned dust containing a large amount of chloride is used as it is as a raw material for sinter, the concentration of chloride in the sinter becomes high, thereby deteriorating the reduction powdering property of the ore. . However, in the conventional method, the removal of chloride from the dust is economically reused as it is, or it is slurried by adding water to the dust to solve the above-mentioned problems. After that, concentrate using a thickener etc. and send to a dehydrator,
The current situation is to carry out a processing method for making dehydrated cake.

【0005】このような処理を行う理由は、前述のとお
りダスト中の塩化物が第一に集塵の効率を低下させるこ
と、第二に焼結鉱の還元粉化性を劣化させること、第三
に焼結ダストは125μm以下の粒子が80%であり非
常に細かく、そのまま再利用することは焼結鉱の生産性
を低下させること、第四に前述の塩化物の高い焼結鉱を
生産した場合には高炉内において、これらの塩化物が気
化し、高炉内壁のレンガ中に浸透し、レンガの寿命を劣
化させる等の理由による。
As described above, the reason for carrying out such a treatment is that the chloride in the dust reduces the efficiency of dust collection first, and secondly the reduction powdering property of the sintered ore deteriorates. Thirdly, the sinter dust is 80% of particles of 125 μm or less, and it is very fine. Reusing as it is reduces the productivity of the sinter, and fourthly, produces the sinter having a high chloride content. In such a case, these chlorides are vaporized in the blast furnace and permeate into the brick on the inner wall of the blast furnace to deteriorate the life of the brick.

【0006】従って、焼結機ダストから塩化物を経済的
に除去することが望まれている。そこで、焼結機ダスト
中の塩化物を除去する技術が提案されている。特開昭5
4−116302号公報においては、焼結機の電気集塵
機により補集されたダストを水洗し、ついで脱水した後
において再利用する方法が開示されている。
Therefore, it is desirable to economically remove chloride from sinter dust. Therefore, a technique for removing chlorides from the sintering machine dust has been proposed. JP 5
Japanese Patent Laid-Open No. 4-116302 discloses a method in which dust collected by an electrostatic precipitator of a sintering machine is washed with water, then dehydrated, and then reused.

【0007】また同様に、特開昭48−18157号公
報においては、電気集塵機で補集したアルカリ金属化合
物を含有する焼結ダストを、攪拌槽中でスプレーノズル
から散水しながら、攪拌機によって攪拌混合してスラリ
ーとする。十分に水と接触させ、焼結機ダスト中のアル
カリ金属分を水に溶解させる。しかる後スラリーをシッ
クナーに搬送し、アルカリ金属分を十分溶出したうえ、
濃縮したスラリーを鉄原料として回収する方法が開示さ
れている。
Similarly, in JP-A-48-18157, the sintering dust containing the alkali metal compound collected by the electrostatic precipitator is agitated and mixed by the agitator while spraying water from the spray nozzle in the agitator. And make a slurry. It is sufficiently contacted with water to dissolve the alkali metal content in the sintering machine dust in water. After that, the slurry was transferred to a thickener to sufficiently elute the alkali metal content,
A method of recovering the concentrated slurry as an iron raw material is disclosed.

【0008】また、特開昭58−224122号公報に
おいては、焼結機の乾式集塵ダストを水で浸出処理し、
ダスト中のアルカリ成分を溶出せしめた後、水分を分離
し、得られた固形分を鉄鉱石原料として供給するダスト
の処理方法が開示されている。しかし、これらの方法に
おいては、焼結ダストと水との濡れ性が悪いため、水と
の混合の際に分散剤等の薬剤を使用する必要があり、経
済的ではないという問題がある。
Further, in JP-A-58-224122, dry dust collecting dust of a sintering machine is leached with water,
A method for treating dust is disclosed in which the alkaline component in the dust is eluted and then the water content is separated and the obtained solid content is supplied as an iron ore raw material. However, in these methods, since the wettability between the sintered dust and water is poor, it is necessary to use a chemical agent such as a dispersant when mixing with water, which is not economical.

【0009】また更に焼結ダストが水に濡れたとして
も、その塩化物の溶出率は一般に約80%であり、90
%以上とするには30分以上の処理時間が必要である。
上記従来の技術の一例を図4に示す。図4に示したとお
り、貯蔵ホッパー2に貯蔵された焼結機ダスト3を切出
ホッパー4にから所定の量を切り出し、溶解槽6に添加
し、攪拌機8により水と焼結機ダストをよく混合する。
Even if the sintered dust gets wet with water, the chloride elution rate is generally about 80%.
A processing time of 30 minutes or more is required to achieve the above.
An example of the above conventional technique is shown in FIG. As shown in FIG. 4, a predetermined amount of the sintering machine dust 3 stored in the storage hopper 2 was cut out from the cutting hopper 4 and added to the melting tank 6, and water and the sintering machine dust were well mixed by the stirrer 8. Mix.

【0010】この際、分散剤14を溶解槽中に添加し、
塩化物が溶解したあとの焼結機ダストを凝集させる。溶
解槽6において水と混合した焼結機ダストはポンプによ
り、まず洗浄シックナー16に搬送され塩化物を水に溶
出し、更に、濃縮シックナー18に搬送される。濃縮シ
ックナー18において濃縮された焼結機ダストを水分と
ともにポンプにより脱水機20、例えばプレスフィルタ
ーにより水分を除去し、ケーキとなった焼結機ダストを
取り出し、このケーキ22を再び焼結機原料として使用
する。
At this time, the dispersant 14 is added to the dissolution tank,
Agglomerate the sintering machine dust after the chloride is dissolved. The sinter dust mixed with water in the dissolution tank 6 is first transported by the pump to the washing thickener 16 to dissolve chloride into water, and further transported to the concentration thickener 18. The sinter dust concentrated in the thickener 18 is removed together with water by a pump with a dehydrator 20, for example, a press filter, to remove cake sinter dust, and the cake 22 is used as a sinter raw material again. use.

【0011】[0011]

【発明が解決しようとする課題】以上のような事情に鑑
み、本発明においては焼結機ダストから塩化物を効率的
に除去すると共に、従来方法において必要だった分散剤
等の界面活性剤の使用をなくすと共に、設備的にもより
簡便な設備において経済的に焼結機ダストから塩化物を
高い効率によって除去する方法を目的とする。
In view of the above-mentioned circumstances, in the present invention, chlorides are efficiently removed from the sintering machine dust, and at the same time, a surfactant such as a dispersant which is required in the conventional method is used. An object of the present invention is to eliminate the use and economically remove chlorides from sinter machine dust with high efficiency in equipment that is simpler in terms of equipment.

【0012】[0012]

【課題を解決するための手段】発明者らは、焼結機ダス
トと水とを効率よくスラリー化するための手段につき、
種々の研究を行った。その結果、従来砂又は汚泥等の運
搬に利用していたジェットポンプを利用することによ
り、水との濡れ性が悪い焼結機ダストを効率よくスラリ
ー化することができるとの知見に基づき下記の発明をす
るに至った。
Means for Solving the Problems The inventors have found a means for efficiently slurrying sintering machine dust and water.
Various studies were conducted. As a result, by using the jet pump that was conventionally used for transporting sand or sludge, etc., it was possible to efficiently sinter the sintering machine dust, which has poor wettability with water, as follows: Invented.

【0013】(1)請求項1の発明は、下記の工程を備
えたことを特徴とする焼結機ダストからの塩化物の除去
方法を提供する。(a)容器の一端からノズルを介して
高圧水を該容器内に噴射し、該ノズルからの高圧水に吸
引させた空気を該噴射水に取込んで該容器内に二流体の
噴射流を発生させる工程と、(b)前記二流体の噴射流
に対して、焼結機ダストを添加して、該焼結機ダストに
含まれている塩化物を水中に溶出しながらスラリーとす
る工程と、(c)前記スラリーを前記容器の他端から排
出させシックナーに導入し、該スラリーから塩化物を十
分溶出しながら該スラリーを濃縮する工程と、(d)前
記シックナーで濃縮したスラリーを脱水し、スラリー中
の焼結機ダストをケーキとする工程。
(1) The invention of claim 1 provides a method for removing chloride from the dust of a sintering machine, which comprises the following steps. (A) High-pressure water is jetted into the container from one end of the container through a nozzle, and the high-pressure water from the nozzle sucks in the jetted water to create a jet flow of two fluids in the container. And (b) adding sinter dust to the jet flow of the two fluids to make chloride contained in the sinter dust into water while making a slurry. , (C) discharging the slurry from the other end of the container and introducing it into a thickener, and concentrating the slurry while sufficiently eluting chloride from the slurry; and (d) dehydrating the slurry concentrated by the thickener. The process of making the sintering machine dust in the slurry into a cake.

【0014】(2)請求項2の発明は、前記高圧水の圧
力が40kg/cm2 以上である請求項1記載の焼結機
ダストからの塩化物の除去方法を提供する。
(2) The invention of claim 2 provides the method for removing chloride from the dust of the sintering machine according to claim 1, wherein the pressure of the high-pressure water is 40 kg / cm 2 or more.

【0015】(3)請求項3の発明は、前記高圧水の重
量1に対して前記焼結機ダストの重量が0.2以下であ
る請求項1または2に記載された焼結機ダストからの塩
化物の除去方法を提供する。
(3) According to the invention of claim 3, the weight of the sintering machine dust is 0.2 or less relative to the weight of the high pressure water of 1 or less. A method of removing chloride is provided.

【0016】[0016]

【作用】本発明においては、前述のとおり従来、砂や汚
泥等の搬送乃至運搬に利用していたポンプを利用し、水
との濡れ性の悪い焼結機ダストを効率よく水と混合する
ことを行う。この装置はいわゆる二流体スラリー化装置
であって、容器の一端から高圧水をノズルから吹き出
し、噴流状の高圧水を生ぜしめ、この噴流により生じた
負圧を利用し、吸引したと空気との二流体混合状態を生
ぜしめる。
In the present invention, as described above, the pump which has conventionally been used for transporting or transporting sand, sludge or the like is used to efficiently mix the sintering machine dust having poor wettability with water with water. I do. This device is a so-called two-fluid slurry forming device, in which high-pressure water is ejected from one end of a container through a nozzle to generate jet-like high-pressure water, and negative pressure generated by this jet is used to draw air when suctioned. It produces a mixed state of two fluids.

【0017】この混合した二流体の噴流に対し、その濡
れ性の悪い焼結機ダストを添加し、該ダストを短時間に
スラリー化する。スラリー化した焼結機ダストを前述の
容器の他端から取り出し、このスラリーを前述の公知の
シックナーに搬送し、ここにおいて塩化物を十分に溶出
させながら濃縮を行なう。シックナーからのスラリーを
フィルタープレス等の脱水機に送って脱水し、焼結機ダ
ストをケーキ状とする。以上が本願発明の概略である。
Sintering machine dust having poor wettability is added to the mixed jet of the two fluids, and the dust is slurried in a short time. Slurry sinter dust is taken out from the other end of the above-mentioned container, and this slurry is conveyed to the above-mentioned known thickener, where it is concentrated while eluting chloride sufficiently. The slurry from the thickener is sent to a dehydrator such as a filter press to be dehydrated, and the sinter dust is formed into a cake. The above is the outline of the present invention.

【0018】本技術において重要な点は焼結機ダスト中
の塩化物をどの程度の効率で溶出させるかが重要であ
る。この点に関して種々の実験を行った結果を図2に示
すが、高圧水の圧力は少くとも40kg/cm2 以上で
あれば、この溶出率は95%以上となった。水圧が10
0kg/cm2 であればほぼ100%に近い溶出が得ら
れる。尚、この際、水に対する焼結ダストの比率は0.
02〜0.2であった。
An important point in this technique is how efficiently the chloride in the sintering machine dust is eluted. The results of various experiments conducted in this regard are shown in FIG. 2. The elution rate was 95% or more when the pressure of the high-pressure water was at least 40 kg / cm 2 or more. Water pressure is 10
At 0 kg / cm 2 , elution close to 100% is obtained. At this time, the ratio of the sintered dust to water was 0.
It was 02-0.2.

【0019】また、高圧水の圧力40kg/cm2 以上
の条件において、水に対する焼結機ダストの重量比につ
いて研究を行った。その結果を図3に示すが、水とダス
トの重量比が0.2以下であれば添加物の溶出効率は9
5%以上であり、前述の比が0.02以下であれば、そ
の溶出効率は97%以上であった。上記溶出効率に対す
る焼結機ダストと水との混合時間即ちスラリー化した後
における滞留時間は少なくとも1分あればよいことも明
らかとなった。
Further, under the condition that the pressure of high-pressure water is 40 kg / cm 2 or more, the weight ratio of the sintering machine dust to water was studied. The results are shown in FIG. 3. When the weight ratio of water to dust is 0.2 or less, the elution efficiency of the additive is 9
When the ratio was 5% or more and the ratio was 0.02 or less, the elution efficiency was 97% or more. It was also clarified that the mixing time of the sintering machine dust and water, that is, the residence time after slurrying, should be at least 1 minute for the above elution efficiency.

【0020】[0020]

【実施例】本実施例において使用した焼結機ダストの成
分組成を表1に示す。また、焼結機ダストの粒度及びN
a,KとClとのモル比を表2に示す。表1に示すよう
に、焼結機ダスト中にNa,K及びClが含まれるが、
表2に示されたモル比からみて、NaCl、KClの如
く、水に溶解可能な塩化物として存在しているものと考
えられる。また、焼結機ダストは80%が直径125μ
m以下と非常に細かいため、表面張力等が働いて水に対
する濡れ性が悪い。
[Examples] Table 1 shows the component composition of the sintering machine dust used in this example. Also, the particle size of the sintering machine dust and N
Table 2 shows the molar ratio of a, K and Cl. As shown in Table 1, the sintering machine dust contains Na, K and Cl.
From the molar ratios shown in Table 2, it is considered that they exist as water-soluble chlorides such as NaCl and KCl. Also, 80% of the sintering machine dust has a diameter of 125μ.
Since it is very fine as m or less, surface tension or the like acts to cause poor wettability with water.

【0021】次に本発明の実施において用いた装置の概
略を図1に示す。即ち従来の方法において用いていた装
置における焼結機ダストの溶解槽に代わって、本発明で
は二流体スラリー機35を設置し、この二流体スラリー
機35により生成したスラリーを従来の洗浄シックナー
16及び濃縮シックナー18にそれぞれかけて塩化物を
十分溶出しながら濃縮した焼結機ダストを脱水機20に
送り、ここで脱水しケーキ22とする。シックナーは円
形連続型でも角形連続型等が使用できる。
Next, FIG. 1 shows an outline of the apparatus used in the practice of the present invention. That is, in place of the sintering machine dust dissolving tank in the apparatus used in the conventional method, a two-fluid slurry machine 35 is installed in the present invention, and the slurry generated by the two-fluid slurry machine 35 is used in the conventional cleaning thickener 16 and The sinter dust that has been concentrated while being sufficiently eluted with chloride over the thickener 18 is sent to the dehydrator 20, where it is dehydrated to form a cake 22. The thickener can be circular continuous type or rectangular continuous type.

【0022】二流体スラリー機35は容器34を備え、
容器34の一端からノズル33を介して高圧水30を容
器34内に噴射する。この際、生じた負圧により外部か
ら空気32を弁31を調節しながら吸い込ませ、二流体
噴流を発生させる。この二流体噴流に対してホッパー3
6から焼結機ダスト3を切出装置37により調節しなが
ら容器34に添加する。焼結機ダストは高い運動のエネ
ルギーを有する水・空気二流体噴流により攪拌混合さ
れ、容易にスラリー化する。
The two-fluid slurry machine 35 comprises a container 34,
The high-pressure water 30 is jetted into the container 34 from one end of the container 34 through the nozzle 33. At this time, the negative pressure generated causes the air 32 to be sucked in from the outside while adjusting the valve 31 to generate a two-fluid jet. Hopper 3 for this two-fluid jet
The sintering machine dust 3 from 6 is added to the container 34 while being adjusted by the cutting device 37. The sinter dust is agitated and mixed by a water / air two-fluid jet having high kinetic energy, and easily slurries.

【0023】スラリー化した焼結機ダストはさらにポン
プを介して洗浄シックナー16に搬送される。ここにお
いて、塩化物は水溶液に十分溶出される。さらに、水溶
液と焼結機ダストは濃縮シックナー18にポンプを介し
て搬送される。濃縮シックナー18において、水に分散
している焼結機ダストは沈降分離される。沈降分離され
たスラリーは、更にポンプにより脱水機20に搬送さ
れ、ここで,例えばプレスフィルターにより水分を除去
され,焼結機ダストはケーキ22となる。
The slurry of the sintering machine dust is further conveyed to the cleaning thickener 16 via a pump. Here, chloride is sufficiently eluted in the aqueous solution. Further, the aqueous solution and the sinter dust are conveyed to the thickener 18 via a pump. In the thickener 18, the sinter dust dispersed in water is separated by settling. The slurry that has been separated by settling is further conveyed by a pump to the dehydrator 20, where water is removed by, for example, a press filter, and the sinter dust becomes a cake 22.

【0024】なお、図1において洗浄シックナー16と
濃縮シックナー18を用いているが、いずれか一方のみ
であってもよい。本発明の方法において、特に特徴的な
二流体スラリー機35により、表3に示すように、水
量、水に対するダストの比率について各々二水準、更に
高圧水の水圧については三水準を選択し、それぞれの運
転条件下で塩化物を除去を行った。
Although the cleaning thickener 16 and the concentration thickener 18 are used in FIG. 1, only one of them may be used. In the method of the present invention, with the particularly characteristic two-fluid slurry machine 35, as shown in Table 3, two levels are selected for the amount of water and the ratio of dust to water, and three levels are selected for the water pressure of high-pressure water. The chloride was removed under the above operating conditions.

【0025】表4に塩化物の溶出率の一例を示す。表4
で、溶出前成分組成とは、焼結機ダストの成分組成であ
り、また、溶出後成分組成とは、塩化物を溶出し、更に
乾燥した後の成分組成である。なお、表4に水に対する
ダスト比が0.11、水圧60kg/cm2 としたとき
の結果を示す。また表4において全組成は100%とな
らないが、残部は酸化鉄が含む酸素である。この表から
本発明の目的とするNa,K及びClは各々95%以上
溶出されている
Table 4 shows an example of chloride elution rates. Table 4
The component composition before elution is the component composition of the sintering machine dust, and the component composition after elution is the component composition after chloride is eluted and further dried. Table 4 shows the results when the dust ratio to water was 0.11 and the water pressure was 60 kg / cm 2 . In Table 4, the total composition is not 100%, but the balance is oxygen contained in iron oxide. From this table, 95% or more of each of Na, K and Cl, which is the object of the present invention, is eluted.

【0026】上記のとおり、本発明の方法によれば目的
とする焼結機ダスト中の塩化物即ちアルカリ金属及びこ
れらと結合している塩素をほぼ完全に除去することが示
された。なお、従来法における塩化物の溶出率は前述の
通り、約80%であり、本発明の方法の溶出率は著しく
高い。以上の結果、本発明の方法により処理された焼結
機ダストは何ら問題なく焼結鉱原料として再利用するこ
とが可能になった。
As described above, according to the method of the present invention, it has been shown that the chlorides, that is, the alkali metals and the chlorine bound to them in the target sintering machine dust are almost completely removed. As described above, the chloride elution rate in the conventional method is about 80%, and the elution rate in the method of the present invention is extremely high. As a result, the sinter dust treated by the method of the present invention can be reused as a sinter raw material without any problem.

【0027】[0027]

【表1】 [Table 1]

【0028】[0028]

【表2】 [Table 2]

【0029】[0029]

【表3】 [Table 3]

【0030】[0030]

【表4】 [Table 4]

【0031】[0031]

【発明の効果】以上説明したとおり、本発明の方法は以
下のような利点がある。 本発明の方法によれば焼結機ダスト中の塩化物を95
%以上の溶出率により溶出できるため、処理された焼結
機ダストを全量焼結機原料として再利用ができる。 従来の方法と異なり、分散剤等の薬剤を使用する必要
が無くなった。 本発明において用いる二流体スラリー機は設備として
も極めて経済的であり、処理費用を低減することができ
る。 本発明の方法により製造された焼結機ダストは塩化物
が少ないため、再利用して製造した焼結鉱の還元粉化性
も良好であり、品質は極めて高い。
As described above, the method of the present invention has the following advantages. According to the method of the present invention, the chloride content in the sintering machine dust is reduced to 95%.
Since the elution can be performed with the elution rate of not less than%, the entire amount of the treated sintering machine dust can be reused as the sintering machine raw material. Unlike conventional methods, it is no longer necessary to use agents such as dispersants. The two-fluid slurry machine used in the present invention is extremely economical as a facility and can reduce processing costs. Since the sinter dust produced by the method of the present invention has a small amount of chloride, the sinter ore produced by reuse is also excellent in reduction powdering property, and the quality is extremely high.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の方法を実施するための焼結機ダストか
ら塩化物を溶出させる装置の概要を示す図である。
1 is a diagram showing an outline of an apparatus for eluting chloride from dust in a sintering machine for carrying out the method of the present invention.

【図2】本発明で用いる二流体スラリー機における高圧
水の水圧と塩化物の溶出率の関係を示す図である。
FIG. 2 is a diagram showing the relationship between the water pressure of high-pressure water and the chloride elution rate in the two-fluid slurry machine used in the present invention.

【図3】本発明に方法における水1に対するダストの重
量比と溶出率との比を示す図である。
FIG. 3 is a diagram showing the ratio of the weight ratio of dust to water 1 and the elution rate in the method of the present invention.

【図4】従来の焼結機ダストから塩化物を溶出するため
の装置の概要を示す図である。
FIG. 4 is a view showing an outline of an apparatus for eluting chloride from conventional sintering machine dust.

【符号の説明】[Explanation of symbols]

16 洗浄シックナー 18 濃縮シックナー 20 脱水機 22 ケーキ 30 高圧水 32 空気 33 ノズル 34 容器 35 二流体スラリー機 16 Washing Thickener 18 Concentration Thickener 20 Dehydrator 22 Cake 30 High Pressure Water 32 Air 33 Nozzle 34 Container 35 Two-fluid Slurry Machine

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 B01F 5/02 Z C22B 1/00 F27D 17/00 105 K (72)発明者 中野 稔陽 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 (72)発明者 田崎 重吉 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 (72)発明者 金子 四郎 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI Technical display location B01F 5/02 Z C22B 1/00 F27D 17/00 105 K (72) Inventor Minoru Nakano Tokyo Metropolitan Government 1-1-2 Marunouchi, Chiyoda-ku Nihon Steel Pipe Co., Ltd. (72) Inventor Shigeyoshi Tasaki 1-1-2 Marunouchi, Tokyo Chiyoda-ku Nihon Steel Pipe Co., Ltd. (72) Inventor Shiro Kaneko Chiyoda-ku, Tokyo Marunouchi 1-2, Nihon Steel Pipe Co., Ltd.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 下記の工程を備えたことを特徴とする焼
結機ダストからの塩化物の除去方法。 (a)容器の一端からノズルを介して高圧水を該容器内
に噴射し、該ノズルからの高圧水に吸引させた空気を該
噴射水に取込んで該容器内に二流体の噴射流を発生させ
る工程と、(b)前記二流体の噴射流に対して、焼結機
ダストを添加して、該焼結機ダストに含まれている塩化
物を水中に溶出しながらスラリーとする工程と、(c)
前記スラリーを前記容器の他端から排出させシックナー
に導入し、該スラリーから塩化物を十分溶出しながら該
スラリーを濃縮する工程と、(d)前記シックナーで濃
縮したスラリーを脱水し、スラリー中の焼結機ダストを
ケーキとする工程。
1. A method for removing chloride from sinter dust, comprising the following steps. (A) High-pressure water is jetted into the container from one end of the container through a nozzle, and the high-pressure water from the nozzle sucks in the jetted water to create a jet flow of two fluids in the container. And (b) adding sinter dust to the jet flow of the two fluids to make chloride contained in the sinter dust into water while making a slurry. , (C)
Discharging the slurry from the other end of the container into a thickener, and concentrating the slurry while sufficiently eluting chloride from the slurry; and (d) dehydrating the slurry concentrated by the thickener, The process of using the sintering machine dust as a cake.
【請求項2】 前記高圧水の圧力が40kgf/cm2
以上である請求項1記載の焼結機ダストからの塩化物の
除去方法。
2. The pressure of the high-pressure water is 40 kgf / cm 2.
The method for removing chloride from the sintering machine dust according to claim 1, which is the above.
【請求項3】 前記高圧水の重量1に対して前記焼結機
ダストの重量が0.2以下である請求項1または2記載
の焼結機ダストからの塩化物の除去方法。
3. The method for removing chloride from sinter machine dust according to claim 1, wherein the weight of the sinter machine dust is 0.2 or less with respect to 1 weight of the high-pressure water.
JP06337768A 1994-12-28 1994-12-28 Removal method of chloride from sintering machine dust Expired - Fee Related JP3120679B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06337768A JP3120679B2 (en) 1994-12-28 1994-12-28 Removal method of chloride from sintering machine dust

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06337768A JP3120679B2 (en) 1994-12-28 1994-12-28 Removal method of chloride from sintering machine dust

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Publication Number Publication Date
JPH08182977A true JPH08182977A (en) 1996-07-16
JP3120679B2 JP3120679B2 (en) 2000-12-25

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Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003311233A (en) * 2002-04-22 2003-11-05 Jfe Steel Kk Method and apparatus for removing soluble substance from dust of sintering machine
JP2006212525A (en) * 2005-02-02 2006-08-17 Hyunday Engineering & Const Co Ltd Method for removing chlorine compound which is included in bottom ash and removal system
JP2007260590A (en) * 2006-03-29 2007-10-11 Sumitomo Osaka Cement Co Ltd Desalination method for waste
JP2008149234A (en) * 2006-12-15 2008-07-03 Sumitomo Osaka Cement Co Ltd Method for reforming coal ash
JP2019163532A (en) * 2018-03-19 2019-09-26 Jfeスチール株式会社 Method and device for removing selenium from sintered dust, and method for reusing sintered dust and method of producing reused dust
JP2022508878A (en) * 2019-08-19 2022-01-19 中南大学 Pre-chlorination-sintering process for high chlorine metallurgical waste and incinerator fly ash

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003311233A (en) * 2002-04-22 2003-11-05 Jfe Steel Kk Method and apparatus for removing soluble substance from dust of sintering machine
JP2006212525A (en) * 2005-02-02 2006-08-17 Hyunday Engineering & Const Co Ltd Method for removing chlorine compound which is included in bottom ash and removal system
JP2007260590A (en) * 2006-03-29 2007-10-11 Sumitomo Osaka Cement Co Ltd Desalination method for waste
JP2008149234A (en) * 2006-12-15 2008-07-03 Sumitomo Osaka Cement Co Ltd Method for reforming coal ash
JP2019163532A (en) * 2018-03-19 2019-09-26 Jfeスチール株式会社 Method and device for removing selenium from sintered dust, and method for reusing sintered dust and method of producing reused dust
JP2022508878A (en) * 2019-08-19 2022-01-19 中南大学 Pre-chlorination-sintering process for high chlorine metallurgical waste and incinerator fly ash

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