JPH0797638A - Treatment of dust kinds produced in iron works - Google Patents
Treatment of dust kinds produced in iron worksInfo
- Publication number
- JPH0797638A JPH0797638A JP26410793A JP26410793A JPH0797638A JP H0797638 A JPH0797638 A JP H0797638A JP 26410793 A JP26410793 A JP 26410793A JP 26410793 A JP26410793 A JP 26410793A JP H0797638 A JPH0797638 A JP H0797638A
- Authority
- JP
- Japan
- Prior art keywords
- zinc
- dust
- iron
- raw material
- wet
- 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.)
- Withdrawn
Links
Classifications
-
- Y02W30/54—
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，製銑，製鋼及び圧延の
製鉄一貫プロセスで発生する含亜鉛ダスト類を処理し
て，焼結鉱製造用原料として利用可能な低亜鉛ダストと
亜鉛精錬原料として利用可能な水酸化亜鉛を得る方法に
関する。The present invention relates to a low zinc dust and a zinc refining raw material which can be used as a raw material for producing a sintered ore by treating zinc-containing dust generated in an integrated iron-making process of iron making, steel making and rolling. For obtaining zinc hydroxide that can be used as
【０００２】[0002]
【従来の技術】本出願人が先に開示した特公平３−６２
７７２号の「製鉄所で発生するダスト類の処理法」によ
れば，図２に示すように，製鉄所で発生するダスト類を
右方の二重枠で囲ったフローで示される焼結鉱製造用原
料を得る処理工程Ａ'と，左方の二重枠で囲ったフロー
で示されるセメント製造用原料を得る処理工程Ｂ'で処
理する構成になっている。2. Description of the Related Art Japanese Patent Publication No. 3-62 previously disclosed by the applicant.
According to No. 772 “Treatment Method for Dusts Generated in Steel Mills”, as shown in FIG. 2, the sinter ore shown in the flow in which dusts generated in steel mills are surrounded by a double frame on the right side The processing is performed in a processing step A ′ for obtaining a raw material for production and a processing step B ′ for obtaining a raw material for cement production shown by a flow surrounded by a double frame on the left side.
【０００３】先ず，工程Ａ'においては，高炉で捕集し
たダストIII'をシックナー８'で濃縮して溶解槽１ａで
ｐＨ６〜７で溶解処理し，アルカリ分を溶出して湿式分
級機２ａに入れ，また，別途捕集した焼結工程や製鋼工
程の環境集塵ダスト（高アルカリ低亜鉛）Ｉ'も溶解槽
１ａで脱アルカリ処理した後に湿式分級機２ａに入れ
る。湿式分級機２ａでは，高亜鉛分はオーバフローＸ
ｂ'，低亜鉛分はアンダーフローＸａ'として分別し，ア
ンダーフローＸａ'をシックナー３ａで濃縮し，混合槽
４ａに入れる。一方，高亜鉛分のオーバフローＸｂ'は
工程Ｂ'のシックナー３ｂに入れる。First, in step A ', the dust III' collected in the blast furnace is concentrated in a thickener 8'and dissolved in a dissolution tank 1a at a pH of 6 to 7 to elute the alkali content and put in a wet classifier 2a. In addition, the environmental dust collection dust (high alkali low zinc) I ′ in the sintering process or the steelmaking process, which is separately collected, is also subjected to dealkalization treatment in the melting tank 1a and then added to the wet classifier 2a. In the wet classifier 2a, high zinc content overflows X
b ′ and low zinc content are separated as underflow Xa ′, the underflow Xa ′ is concentrated by the thickener 3a, and put into the mixing tank 4a. On the other hand, the overflow Xb 'of the high zinc content is put into the thickener 3b of the process B'.
【０００４】そして，混合槽４ａには転炉シックナーケ
ーキ（低亜鉛分）も入れる。この低亜鉛分転炉シックナ
ーケーキは，転炉排ガス湿式集塵機から出るスラッジI
Ｖ'の流れを転炉操業の時間帯サイクルに応じて弁９'を
切り換え操作することによって高亜鉛ダスト分IＶｂ'と
低亜鉛ダスト分IＶａ'とに分別採集し，この低亜鉛ダス
ト分IＶａ'を混合槽１０'，湿式分級槽１１'，シックナ
ー１２'を経て得たものを使用する。また，混合槽１０'
に路面清掃汚泥IＸ'を入れて同時処理を行っている。な
お，分別採集された高亜鉛ダスト分IＶｂ'は工程Ｂ'の
溶解槽１ｂに入れる。A converter thickener cake (low zinc content) is also placed in the mixing tank 4a. This low zinc content converter thickener cake is the sludge I from the converter exhaust gas wet dust collector.
The flow of V ′ is separately collected into a high zinc dust content IVb ′ and a low zinc dust content IVa ′ by switching the valve 9 ′ according to the time zone cycle of the converter operation, and this low zinc dust content IVa ′ is collected. Is obtained through the mixing tank 10 ', the wet classification tank 11', and the thickener 12 '. Also, the mixing tank 10 '
The road cleaning sludge IX 'is put in and processed at the same time. The high-zinc dust portion IVb ′ separately collected is put in the dissolution tank 1b in step B ′.
【０００５】こうして，工程Ａ'の混合槽４ａに高炉ダ
スト系の低亜鉛シックナーケーキと転炉ダスト系のシッ
クナーケーキを導入して混合し，フィルタープレス５ａ
でプレスして湿潤低亜鉛ダストを採集する。次いで，こ
の湿潤低亜鉛ダストに，高炉や焼結炉廻りの環境集塵ダ
ストＶ'，石灰系ダスト（製鋼打ち込みホッパーダス
ト）ＶIII'，圧延シックナーケーキＶI'の乾燥品，石灰
焼成炉洗浄汚泥ＶII'の乾燥品を適当な割合で混入させ
て混合機６ａで混合し，その混合物を解砕機７ａで解砕
して焼結鉱製造用原料を得るようになっている。In this way, the blast furnace dust type low zinc thickener cake and the converter dust type thickener cake are introduced into the mixing tank 4a of the step A'and mixed, and the filter press 5a.
Press to collect wet low zinc dust. Next, to the wet low-zinc dust, environmental dust collection dust V'around the blast furnace and sintering furnace, lime-based dust (steel driving hopper dust) VIII ', dried product of rolled thickener cake VI', lime firing furnace cleaning sludge VII The dried product of 'is mixed in an appropriate ratio and mixed by a mixer 6a, and the mixture is crushed by a crusher 7a to obtain a raw material for producing a sintered ore.
【０００６】一方，工程Ｂ'においては，前述の切り換
え弁９'の切り換えによって分別採集した転炉ダストの
高亜鉛分IＶｂ'を，製鋼炉廻りの高アルカリ高亜鉛の環
境集塵ダストII'と共に溶解槽１ｂに入れてアルカリ分
を溶出した後，湿式分級機２ｂでオーバフローとアンダ
ーフローとに分け，オーバフローは工程Ａ'の湿式分級
機２ａのオーバーフローＸｂ'と共にシックナー３ｂで
濃縮し，混合層４ｂに入れる。そして，この混合槽４ｂ
に湿式分級機２ｂのアンダーフローも導入してその混合
物をフィルタープレス５ｂでプレスして湿潤高亜鉛ダス
トを採集する。この湿潤高亜鉛ダストと，高炉や焼結炉
廻りの環境集塵ダストＶ'，石灰系ダスト（製鋼打ち込
みホッパーダスト）ＶIII'を混合機６ｂで混合し，解砕
機７ｂで解砕してセメント製造用原料を得るようになっ
ている。On the other hand, in the step B ', the high zinc content IVb' of the converter dust separately collected by switching the switching valve 9'is used together with the high alkaline and high zinc environmental dust II 'around the steelmaking furnace. After being put in the dissolution tank 1b to elute the alkali content, it is divided into overflow and underflow by the wet classifier 2b, and the overflow is concentrated by the thickener 3b together with the overflow Xb 'of the wet classifier 2a in the step A', and the mixed layer 4b. Put in. And this mixing tank 4b
An underflow of the wet classifier 2b is also introduced to press the mixture with a filter press 5b to collect wet high zinc dust. This wet high-zinc dust, the environmental dust collection dust V'and the lime-based dust (steel making hopper dust) VIII 'around the blast furnace and the sintering furnace are mixed by the mixer 6b and crushed by the crusher 7b to produce cement. To get raw materials.
【０００７】[0007]
【発明が解決しようとする課題】以上のような製鉄所の
ダストを処理した結果物の全部が製鉄所内で消費できる
こととなれば，優れた省資源化が実現され，生産効率も
向上する。しかし，特公平３−６２７７２号の「製鉄所
で発生するダスト類の処理法」は，製鉄所で発生する各
種ダスト類を簡便な設備で総合的に一括処理できるもの
の，最終的に製鉄所内で十分な需要のないセメント製造
用原料を製造している。このため，セメント製造用原料
を外部に販売する必要があり，また，十分な需要がない
場合には，製鉄所内にセメント原料を備蓄するための広
大な敷地を確保しなければならないといった問題も生じ
る。If all of the products resulting from the treatment of dust in the steelworks as described above can be consumed in the steelworks, excellent resource saving is realized and production efficiency is also improved. However, according to Japanese Patent Publication No. 3-62772, "Method of treating dust generated in steel mills", although various dusts generated in steel mills can be comprehensively treated collectively with simple equipment, finally in the steel mill. Manufactures raw materials for cement production without sufficient demand. For this reason, it is necessary to sell raw materials for cement production to the outside, and when there is not sufficient demand, there is also a problem that a vast site for stockpiling cement raw materials must be secured within the steel mill. .
【０００８】従って，製鉄所で発生したダスト類は可能
な限り製鉄所内で利用できる原料，例えば，焼結鉱製造
用原料にすることが望ましいが，そのためには，これま
でセメント製造用原料としていた湿潤高亜鉛ダストを脱
亜鉛処理する必要がある。[0008] Therefore, it is desirable that the dusts generated in the steel mill be used as raw materials that can be used in the steel mill as much as possible, for example, raw materials for the production of sinter, but for that purpose, they have been used as raw materials for cement production until now. Wet zinc-rich dust needs to be dezincified.
【０００９】ここで，焼結鉱などの高炉原料において有
害な亜鉛を除去し，好適な鉄源を得る方法として，従来
より，乾式の脱亜鉛法と湿式の脱亜鉛法の二つが知られ
ている。乾式脱亜鉛法は，高炉シックナーダストや転炉
シックナーダストを脱水後，望ましくはペレット化させ
て乾燥し，予熱後，還元炉で還元剤とともに還元焼成し
て亜鉛を還元揮発させることにより鉄源から除去するも
のであって高い脱亜鉛率が得られる方法である。しか
し，この乾式脱亜鉛法は設備費が高く，処理量が少ない
場合，経済的に実施が困難であるといった問題があっ
た。一方，湿式の脱亜鉛法は，高炉シックナーダストや
転炉シックナーダスト中の亜鉛を酸またはアルカリで浸
出して鉄源から分離し，浸出液を中和させて亜鉛を回収
する方法である。しかし，従来の湿式脱亜鉛法にあって
は，予め別途用意しておいた中和剤を用いており，それ
らが高価であるため，コスト的に実施が困難であった。Here, as a method for removing harmful zinc in a blast furnace raw material such as a sinter or the like to obtain a suitable iron source, two methods, a dry dezincing method and a wet dezincing method, have been conventionally known. There is. In the dry dezincification method, blast furnace thickener dust and converter thickener dust are dehydrated, preferably pelletized and dried, and after preheating, they are reduced and fired together with a reducing agent in a reducing furnace to reduce and volatilize zinc from an iron source. It is a method of removing and obtaining a high dezincification rate. However, this dry dezincing method has a problem that it is economically difficult to carry out when the equipment cost is high and the treatment amount is small. On the other hand, the wet dezincification method is a method in which zinc in blast furnace thickener dust or converter thickener dust is leached with acid or alkali to separate it from the iron source, and the leachate is neutralized to recover zinc. However, in the conventional wet dezincification method, the neutralizing agent prepared separately beforehand is used, and since these are expensive, it is difficult to carry out in terms of cost.
【００１０】本発明は，製鉄所で発生する各種ダスト類
を総合的に一括処理するに際し，中和剤を別途用意しな
くて済む湿式の脱亜鉛法を用いて高亜鉛ダストから亜鉛
を除去することを可能にすると共に，各種ダスト類の大
部分を製鉄所内で消費可能な原料として回収できるよう
にすることを目的としている。The present invention removes zinc from high-zinc dust by using a wet dezincing method that does not require a separate neutralizing agent when comprehensively treating various dusts generated in a steel mill. In addition to making it possible, most of the various kinds of dust can be recovered as a consumable raw material in the steel mill.
【００１１】[0011]
【課題を解決するための手段】以上の目的を達成するた
めに，製銑，製鋼及び圧延の製鉄一貫プロセスで発生す
る含亜鉛ダスト類を分別採集または湿式分級することに
より低亜鉛ダストと高亜鉛ダストとに分離し，該高亜鉛
ダストに酸を接触させて亜鉛を浸出させた後，低亜鉛ダ
ストと浸出液に固液分離し，該浸出液を上記分別採集ま
たは湿式分級した際に発生したアルカリ性の廃水を用い
て中和させて水酸化亜鉛を析出させる処理方法を構成し
た。[Means for Solving the Problems] In order to achieve the above object, low zinc dust and high zinc content can be obtained by separately collecting or wet classifying zinc-containing dusts generated in an integrated iron-making process of ironmaking, steelmaking and rolling. After separating into dust and leaching zinc by contacting the high zinc dust with an acid, solid-liquid separation into low zinc dust and leachate, and the alkaline leachate generated when the leachate is separately collected or wet classified as above. A treatment method for precipitating zinc hydroxide by neutralizing with waste water was constituted.
【００１２】そして，低亜鉛ダストは焼結鉱製造用原料
として利用し，水酸化亜鉛は亜鉛精錬原料として利用す
ることとした。The low zinc dust is used as a raw material for producing sinter, and the zinc hydroxide is used as a zinc refining raw material.
【００１３】また，浸出液中に溶解している鉄分が多い
場合には，中和により水酸化亜鉛を析出させる前に，予
めその鉄分を水酸化鉄として析出させて回収するように
した。When a large amount of iron is dissolved in the leachate, the iron is preliminarily precipitated as iron hydroxide and recovered before zinc hydroxide is precipitated by neutralization.
【００１４】[0014]
【作用】本発明において，製銑，製鋼及び圧延の製鉄一
貫プロセスで発生する含亜鉛ダスト類とは，主として高
炉ダストのシックナーケーキや転炉ダストのシックナー
ケーキを意味し，その他，製鋼工程での環境集塵ダスト
類など亜鉛を比較的多量に含むダスト類も含まれる。ま
た，亜鉛含有量は比較的少ないが，アルカリ分を多く含
んでいる焼結工程や製鋼工程での環境集塵ダスト類も本
発明において含亜鉛ダストとして処理される。In the present invention, the zinc-containing dusts generated in the iron-making, iron-making and rolling-integrated iron-making integrated processes mainly mean thickener cakes of blast furnace dust and thickener cakes of converter dust. Dusts containing a relatively large amount of zinc such as environmental dust collection are also included. Further, environmental dust collection dusts in a sintering process or a steelmaking process, which have a relatively low zinc content but contain a large amount of alkali, are treated as zinc-containing dust in the present invention.
【００１５】含亜鉛ダスト類を分別採集して低亜鉛ダス
トと高亜鉛ダストに分離するとは，例えば，本出願人に
係る特公昭６２−４９３３６号に記載したように，転炉
操業の時間帯サイクルに応じて転炉排ガス湿式集塵機か
ら出るスラッジの流れを切り換えて高亜鉛ダスト分と低
亜鉛ダスト分とを分別採集することを意味する。Separating and collecting zinc-containing dust to separate it into low-zinc dust and high-zinc dust means, for example, as described in Japanese Patent Publication No. 62-49336 of the present applicant, the time zone cycle of converter operation. It means that the flow of sludge from the converter exhaust gas wet dust collector is switched according to the above conditions to separately collect high zinc dust content and low zinc dust content.
【００１６】含亜鉛ダスト類を湿式分級して低亜鉛分と
高亜鉛分に分離するとは，高炉ダストのシックナーケー
キや転炉ダストのシックナーケーキ，あるいは分別採集
によって分離された高亜鉛ダスト分，更には路面清掃汚
泥などを湿式分級して微粉の高亜鉛スラリーと粗粉の低
亜鉛スラリーとに分離することを意味する。[0016] Wet-classifying zinc-containing dusts to separate them into low-zinc content and high-zinc content means the thickener cake of blast furnace dust, the thickener cake of converter dust, or the high-zinc dust content separated by separate collection. Means that the road cleaning sludge or the like is wet-classified to be separated into fine powder high-zinc slurry and coarse powder low-zinc slurry.
【００１７】このように分別採集または湿式分級によっ
て分離された高亜鉛ダストは，原材料の種類や量によっ
て変化するが，全体として３％以上の亜鉛を含有する。
他方，低亜鉛ダストの亜鉛含有量は１.５％以下とな
る。The high zinc dust separated by the separate collection or the wet classification as described above contains 3% or more of zinc as a whole, although it varies depending on the kind and amount of the raw material.
On the other hand, the zinc content of the low zinc dust is 1.5% or less.
【００１８】高亜鉛ダストは，硫酸，塩酸などの酸と接
触させ，亜鉛を浸出させる。同時に，鉄の一部も浸出さ
れるが，これを制御するためには空気，酸素，過酸化水
素などの酸化剤を併用すればよい。常温で処理は可能で
あるが，亜鉛の浸出と鉄の酸化を促進するため５０℃以
上に加熱することが好ましい。浸出時のｐＨは，１〜４
が適当である。The high zinc dust is brought into contact with acids such as sulfuric acid and hydrochloric acid to leach zinc. At the same time, a part of iron is also leached out, and in order to control this, an oxidizing agent such as air, oxygen or hydrogen peroxide may be used together. Although the treatment is possible at room temperature, it is preferable to heat it to 50 ° C. or higher in order to promote leaching of zinc and oxidation of iron. PH during leaching is 1 to 4
Is appropriate.
【００１９】浸出後の低亜鉛含鉄残渣は焼結鉱製造用原
料とするため，可溶性亜鉛及び酸痕をできるだけ分離す
ることが好ましく，水で洗浄する。この含鉄残渣は前記
の含亜鉛ダストを分別採集または湿式分離して得た低亜
鉛ダストとともに混合機で混合し，最終成品の水分が適
正になるような量で乾ダストを添加配合して焼結鉱製造
用原料を得る。水分調整のため添加する乾ダストは石灰
系乾ダストや環境集塵ダストであり，亜鉛は多くても
０.２％しか含有せず，焼結鉱製造用原料の亜鉛含有率
を上げることはない。Since the low-zinc iron-containing residue after leaching is used as a raw material for the production of sinter, it is preferable to separate soluble zinc and acid traces as much as possible, and wash with water. This iron-containing residue is mixed with a low-zinc dust obtained by separately collecting or wet-separating the above zinc-containing dust in a mixer, and dry dust is added and mixed in an amount such that the final product has an appropriate water content, and then sintered. Obtain raw materials for ore production. The dry dust added to adjust the water content is lime-based dry dust or environmental dust, and contains only 0.2% of zinc at most, and does not increase the zinc content of the raw material for sinter production. .
【００２０】高亜鉛ダストの亜鉛を溶解した酸性の浸出
液は，前記の分別採集または湿式分級した際に発生した
アルカリ性の廃水を用いて中和し，水酸化亜鉛を析出さ
せる。焼結工程や脱硫工程での環境集塵ダストや石灰焼
成炉洗浄汚泥などアルカリ分を多く含むダスト類を湿式
で集塵，分別採集，分級等の処理後，沈降もしくは濾過
により固形分を除去すると，高アルカリ性の清澄水を得
ることができるので，その高アルカリ性の廃水を中和剤
として用いて水酸化亜鉛を析出させ，得られた水酸化亜
鉛は亜鉛精錬原料とする。中和のｐＨは８.５以上が好
ましい。より高純度の水酸化亜鉛を得る場合には酸化剤
の存在下にｐＨ２〜５で中和し，その後，一旦固液分離
して水酸化鉄を主とする残渣を除去してからｐＨ８.５
以上にすることが好ましい。なお，固液分離した液中の
重金属は排水基準以下となるためｐＨ調節のみで排水が
可能であり，また，再利用することもできる。The zinc-dissolved acidic leachate of high-zinc dust is neutralized using the alkaline wastewater generated during the above-mentioned fractional collection or wet classification to precipitate zinc hydroxide. If the solids are removed by sedimentation or filtration after the wet dust collection, separation collection, classification, etc. of dusts containing a large amount of alkali such as environmental dust collection dust in the sintering process and desulfurization process and lime firing furnace cleaning sludge Since highly alkaline clear water can be obtained, zinc hydroxide is precipitated by using the highly alkaline waste water as a neutralizing agent, and the obtained zinc hydroxide is used as a zinc refining raw material. The neutralization pH is preferably 8.5 or higher. In order to obtain higher purity zinc hydroxide, it is neutralized in the presence of an oxidant at pH 2 to 5, and then solid-liquid separation is performed once to remove the residue mainly containing iron hydroxide and then pH 8.5.
The above is preferable. In addition, since the heavy metal in the liquid obtained by solid-liquid separation falls below the drainage standard, drainage is possible only by adjusting the pH, and it can also be reused.
【００２１】[0021]
【実施例】以下，図１のフローシートに従って本発明の
実施例を具体的に説明する。図１において，右方の二重
枠で囲ったフローは焼結鉱製造用原料を得る処理工程Ａ
であり，左方の二重枠で囲ったフローは亜鉛精錬原料と
して再利用可能な水酸化亜鉛を得る処理工程Ｂを示して
いる。本発明において，製銑，製鋼及び圧延の製鉄一貫
プロセスで発生する含亜鉛ダスト類をこれら二つの工程
Ａ，Ｂで処理するようになっている。各処理を実施する
ために，工程Ａには溶解槽１，湿式分級機２，シックナ
ー３，混合槽４，フィルタープレス５，混合機６，解枠
機７からなる一連の設備が設けてあり，また，工程Ｂに
はＺｎ浸出槽１３，シックナー１４，洗浄槽１５，フィ
ルタープレス１６，中和槽１７，フィルタープレス１８
からなる一連の設備が設けてある。なお，図中の実線は
ダスト及びダストを含んだスラリーの流れを示し，点線
は液体の流れを示す。Embodiments of the present invention will be specifically described below with reference to the flow sheet of FIG. In FIG. 1, the flow surrounded by a double frame on the right is a process step A for obtaining a raw material for producing a sintered ore.
And the flow surrounded by a double frame on the left side shows the processing step B for obtaining reusable zinc hydroxide as a zinc refining raw material. In the present invention, zinc-containing dusts generated in the iron-making, iron-making, and rolling-integrated iron-making integrated processes are treated in these two steps A and B. In order to carry out each treatment, a series of equipment including a dissolution tank 1, a wet classifier 2, a thickener 3, a mixing tank 4, a filter press 5, a mixer 6 and a frame breaker 7 is provided in the step A, In step B, Zn leaching tank 13, thickener 14, cleaning tank 15, filter press 16, neutralization tank 17, filter press 18
A series of equipment consisting of The solid line in the figure shows the flow of dust and the slurry containing dust, and the dotted line shows the flow of liquid.
【００２２】先ず，焼結鉱製造用原料を得る処理工程Ａ
を説明する。高炉で捕集したダストIIIをシックナー８
で濃縮してシックナーケーキIIIａとした後，溶解槽１
でｐＨ６〜７で溶解処理してアルカリ分を溶出し，次い
で湿式分級機２に入れる。また，別途捕集した焼結工程
や製鋼工程の環境集塵ダスト（高アルカリ低亜鉛ダス
ト）Ｉも溶解槽１で脱アルカリ処理した後，湿式分級機
２に入れる。First, processing step A for obtaining a raw material for producing a sintered ore
Will be explained. Dust III collected in the blast furnace is thickener 8
After thickening with a thickener cake IIIa, dissolver 1
The solution is subjected to dissolution treatment at pH 6 to 7 to elute the alkali content, and then placed in the wet classifier 2. Further, environmental dust collection dust (high-alkali low-zinc dust) I in the sintering process or steel-making process, which has been separately collected, is dealkalized in the melting tank 1 and then placed in the wet classifier 2.
【００２３】湿式分級機２において，高亜鉛分をオーバ
フローＸｂ，低亜鉛分をアンダーフローＸａとして分離
し，低亜鉛分のアンダーフローＸａをシックナー３で濃
縮した後，混合槽４に入れる。一方，高亜鉛分のオーバ
フローＸｂは後述の工程ＢのＺｎ浸出槽１３に入れる。
また，シックナー３において清澄水として得た高アルカ
リ廃水ＸIVは，後述する工程Ｂの中和槽１７に送る。In the wet classifier 2, a high zinc content is separated as an overflow Xb and a low zinc content is separated as an underflow Xa, and the low zinc content underflow Xa is concentrated by a thickener 3 and then put into a mixing tank 4. On the other hand, the overflow Xb of the high zinc content is put into the Zn leaching tank 13 in the step B described later.
Further, the highly alkaline waste water XIV obtained as clear water in the thickener 3 is sent to the neutralization tank 17 in step B described later.
【００２４】混合槽４には転炉シックナーケーキ（低亜
鉛分）も入れる。この低亜鉛分転炉シックナーケーキ
は，本出願人が特公昭６２−４９３３６号で開示した方
法によって回収する。即ち，弁９を転炉操業の時間帯サ
イクルに応じて切り換え操作し，転炉排ガス湿式集塵機
から出るスラッジ（ダストIＶ）の流れを切り換えるこ
とによって高亜鉛ダスト分IＶｂと低亜鉛ダスト分IＶａ
とを分別採集する。こうして採集した低亜鉛ダスト分I
Ｖａを混合槽１０，湿式分級槽１１，シックナー１２の
順に通過させることにより得られたシックナーケーキを
混合槽４に入れる。なお，混合槽１０には路面清掃汚泥
IＸも入れて同時に処理する。なお，分別採集された高
亜鉛ダスト分IＶｂは，後述の工程ＢのＺｎ浸出槽１３
に入れる。The mixing tank 4 also contains a converter thickener cake (low zinc content). This low zinc content converter thickener cake is recovered by the method disclosed by the applicant in Japanese Patent Publication No. 62-49336. That is, the valve 9 is switched in accordance with the time zone cycle of the converter operation to switch the flow of sludge (dust IV) emitted from the converter exhaust gas wet dust collector, whereby the high zinc dust content IVb and the low zinc dust content IVa are changed.
And collect separately. Low zinc dust I collected in this way I
The thickener cake obtained by passing Va through the mixing tank 10, the wet classification tank 11, and the thickener 12 in that order is placed in the mixing tank 4. The mixing tank 10 has a road surface cleaning sludge.
IX is also included and processed at the same time. The high zinc dust content IVb separately collected is the Zn leaching tank 13 in the process B described later.
Put in.
【００２５】以上のように工程Ａの混合槽４に高炉ダス
ト等の低亜鉛シックナーケーキと転炉ダスト等のシック
ナーケーキを導入して混合し，次いでフィルタープレス
５でプレスすることにより濃縮，脱水する。そのプレス
品を湿潤低亜鉛ダストとして採集する。また，濃縮，脱
水により発生した廃水は，シックナー３の清澄水と一緒
に，高アルカリ廃水ＸIVとして後述する工程Ｂの中和槽
１７に送る。As described above, the low-zinc thickener cake such as blast furnace dust and the thickener cake such as converter dust are introduced into the mixing tank 4 of the step A and mixed, and then concentrated and dehydrated by pressing with the filter press 5. . The pressed product is collected as wet low zinc dust. Further, the wastewater generated by the concentration and dehydration is sent to the neutralization tank 17 of the step B described later together with the clear water of the thickener 3 as the highly alkaline wastewater XIV.
【００２６】そして，フィルタープレス５によりプレス
品として採集した湿潤低亜鉛ダストと，後述する工程Ｂ
においてフィルタープレス１６によって同様にプレス品
として採集された残渣ＸIIIに，例えば高炉や焼結炉廻
りの環境集塵乾ダストＶ，石灰系乾ダスト（製鋼打ち込
みホッパーダスト）ＶIII，圧延シックナーケーキＶIや
石灰焼成炉洗浄汚泥ＶIIの乾燥品などといった亜鉛含量
の微量な非亜鉛系乾ダストを適当量加えて混合機６で混
合し，焼結鉱原料として供するときの所望の水分値以下
となるように調整された混合物を得る。かくして，得ら
れた混合物を必要に応じて解砕機７で解砕し，焼結鉱製
造用原料を得る。Then, the wet low-zinc dust collected as a pressed product by the filter press 5 and the step B described later.
In the residue XIII similarly collected as a pressed product by the filter press 16 in, for example, environmental dust collection dry dust V around the blast furnace and the sintering furnace, lime system dry dust (steel driving hopper dust) VIII, rolled thickener cake VI and lime. An appropriate amount of non-zinc-based dry dust containing a small amount of zinc, such as a dried product of the firing furnace cleaning sludge VII, is added and mixed in the mixer 6 so that the water content is less than the desired water content when used as a raw material for sinter. The mixture obtained is obtained. Thus, the obtained mixture is crushed by the crusher 7 as required to obtain a raw material for producing a sintered ore.
【００２７】次に，亜鉛精錬原料として再利用可能な水
酸化亜鉛を得る処理工程Ｂを説明する。先ず，Ｚｎ浸出
槽１３に，前述の切り換え弁９を切り換え操作すること
によって分別採集した転炉ダストの高亜鉛分IＶｃ，及
び工程Ａの湿式分級機２においてオーバフローＸｂとし
て分離された高亜鉛分を，製鋼炉廻りの高アルカリ高亜
鉛の環境集塵ダストIIと共にＺｎ浸出槽１３に入れ，硫
酸などの酸と接触させて亜鉛を浸出させる。Next, the processing step B for obtaining reusable zinc hydroxide as a zinc refining raw material will be described. First, in the Zn leaching tank 13, the high zinc content IVc of the converter dust separately collected by switching the switching valve 9 and the high zinc content separated as the overflow Xb in the wet classifier 2 of the process A are collected. , Is placed in a Zn leaching tank 13 together with high-alkali and high-zinc environmental dust II around the steelmaking furnace, and zinc is leached in contact with an acid such as sulfuric acid.
【００２８】浸出操作で残った残渣はシックナー１４で
濃縮し，次いで洗浄漕１５において水で洗浄して残渣に
残留している亜鉛と硫酸分を除去し，更にフィルタープ
レス１６で固液分離して亜鉛含有量の低い湿潤低亜鉛ダ
スト（含鉄残渣）ＸIIIを得る。こうして得た残渣ＸIII
は，上述したように，工程Ａの混合機６に送られて焼結
鉱製造用原料となる。The residue remaining in the leaching operation is concentrated in a thickener 14, then washed with water in a washing tank 15 to remove the zinc and sulfuric acid remaining in the residue, and further solid-liquid separated by a filter press 16. A wet low zinc dust (iron-containing residue) XIII having a low zinc content is obtained. Residue XIII thus obtained
As described above, is sent to the mixer 6 in the step A and becomes a raw material for producing a sintered ore.
【００２９】そして，シックナー１４の清澄水とフィル
タープレス１６の廃水は中和漕１７に入れ，これに上述
の工程Ａで得た高アルカリ廃水ＸIVをｐＨ８.５以上に
なるまで添加して，水酸化亜鉛を析出させる。こうして
析出させた水酸化亜鉛は，フィルタープレス１８で脱水
し，亜鉛製錬原料として回収する。また，フィルタープ
レス１８で発生した廃水は再生水として利用可能とな
る。Then, the clear water of the thickener 14 and the waste water of the filter press 16 are put in a neutralization tank 17, and the highly alkaline waste water XIV obtained in the above step A is added thereto until the pH becomes 8.5 or more, and the water is added. Precipitate zinc oxide. The zinc hydroxide thus deposited is dehydrated by the filter press 18 and recovered as a zinc smelting raw material. Further, the wastewater generated in the filter press 18 can be used as reclaimed water.
【００３０】なお，シックナー１４の清澄水とフィルタ
ープレス１６の廃水に溶解している鉄分が多い場合に
は，先ず，中和漕１７に高アルカリ廃水ＸIVをｐＨ２〜
５になるまでまで添加して水酸化鉄を析出させる。そし
て，析出させた水酸化鉄をフィルタープレス１８で脱水
し，湿潤低亜鉛ダストＸVにして工程Ａの混合機６に送
り，焼結鉱製造用原料とする。When a large amount of iron is dissolved in the clear water of the thickener 14 and the wastewater of the filter press 16, first, the highly alkaline wastewater XIV is added to the neutralization tank 17 at a pH of 2 to 2.
Add iron until 5 to precipitate iron hydroxide. Then, the precipitated iron hydroxide is dehydrated by the filter press 18 to form wet low zinc dust XV and sent to the mixer 6 in the step A to be used as a raw material for producing a sintered ore.
【００３１】そして，フィルタープレス１８の廃液は再
び中和漕１７に戻し，先に説明したときと同様に高アル
カリ廃水ＸIVをｐＨ８.５以上になるまで添加して水酸
化亜鉛を析出させ，フィルタープレス１８で脱水後，亜
鉛製錬原料として回収する。この場合は，フィルタープ
レス１８で発生した廃水は再生水として利用できるもの
となる。Then, the waste liquid of the filter press 18 is returned to the neutralization tank 17 again, and as in the case described above, the highly alkaline waste water XIV is added until the pH becomes 8.5 or more to precipitate zinc hydroxide, and the filter is filtered. After dehydration with the press 18, it is recovered as a zinc smelting raw material. In this case, the wastewater generated in the filter press 18 can be used as reclaimed water.
【００３２】次に，以上に説明した図１の処理方法によ
り含亜鉛ダスト類を実際に処理した実験例を示す。実験
に供した各種ダストの化学組成（ｍａｓｓ％）と配合率
を表１に示した。Next, an experimental example in which zinc-containing dusts are actually treated by the treatment method of FIG. 1 described above will be shown. Table 1 shows the chemical composition (mass%) and the compounding ratio of each type of dust used in the experiment.
【００３３】[0033]
【表１】 [Table 1]
【００３４】表１中の種別Ｉ，II，IIIａ，IＶ，Ｖ，Ｖ
I，ＶII，ＶIII，IＸは，図１で説明した環境集塵ダス
トＩ，環境集塵ダストII，高炉シックナーケーキIII
ａ，転炉ダストIＶ系のシックナーケーキ，環境集塵乾
ダストＶ，圧延シックナーケーキＶI，石灰焼成炉洗浄
汚泥ＶII，石灰系乾ダストＶIII，路面清掃汚泥IＸをそ
れぞれ示している。また，各ダストの重量割合は配合率
に示すものとした。各ダストの配合率を製鉄所で発生す
る各ダストの発生率に一致させることにより，製鉄所の
全ダストを本発明により処理可能か否かを確かめるよう
にした。Types I, II, IIIa, IV, V, V in Table 1
I, VII, VIII, and IX are the environmental dust collection dust I, the environmental dust collection dust II, and the blast furnace thickener cake III described in FIG.
a, Converter dust IV thickener cake, environmental dust collection dry dust V, rolling thickener cake VI, lime firing furnace cleaning sludge VII, lime dry dust VIII, road surface cleaning sludge IX, respectively. The weight ratio of each dust is shown in the blending ratio. By matching the mixing ratio of each dust with the generation ratio of each dust generated in the steel mill, it was confirmed whether all the dust in the steel mill could be treated by the present invention.
【００３５】先ず，Ｉ，III，IＶの各ダスト（シックナ
ーケーキ）を分別採集と湿式分級し，Ｚｎ含有量が２
５.９ｍａｓｓ％の高亜鉛ダストＸｂ，IＶｂを得た。工
程Ｂにおいて，これらに環境集塵ダストIIを加え，２０
％の硫酸を添加してｐＨ２.５〜３に保ちながら空気攪
拌し亜鉛を浸出した。この残渣を濃縮後，水で洗浄して
脱水し，表２の組成の含鉄残渣ＸIIIを得た。First, I, III, and IV dusts (thickener cakes) were separately collected and wet-classified to obtain a Zn content of 2
High zinc dust Xb and IVb of 5.9 mass% were obtained. In process B, environmental dust collection II was added to these,
% Sulfuric acid was added to maintain the pH at 2.5 to 3, and zinc was leached by stirring with air. The residue was concentrated, washed with water and dehydrated to obtain an iron-containing residue XIII having the composition shown in Table 2.
【００３６】[0036]
【表２】 [Table 2]
【００３７】一方，含鉄残渣ＸIIIを分離した浸出液に
ｐＨ４となるまでｐＨ１３の高アルカリ廃水ＸIVを添加
し，析出した水酸化鉄を主とする残渣ＸVを回収した。
残渣ＸVの組成を表２に示す。On the other hand, highly alkaline waste water XIV of pH 13 was added to the leachate from which the iron-containing residue XIII had been separated, until pH 4 was obtained, and the residue XV mainly containing precipitated iron hydroxide was recovered.
The composition of the residue XV is shown in Table 2.
【００３８】更に，浸出液にｐＨ９となるまで高アルカ
リ廃水ＸIVを添加して，水酸化亜鉛を主とする残渣を得
た。また，工程Ａにおいて，含鉄残渣ＸIII，水酸化鉄
残渣ＸV，ダスト（シックナーケーキ）Ｘａ，ダスト
（シックナーケーキ）IＶａに水分調整用のダストＶ，
ＶI，ＶII，ＶIIIを混合して，焼結鉱製造用原料を得
た。工程Ｂにおいて得た水酸化亜鉛（亜鉛精錬原料）の
化学組成と，工程Ａにおいて得た焼結鉱製造用原料の化
学組成を，表３にそれぞれ示した。Further, the highly alkaline waste water XIV was added to the leachate until the pH became 9, to obtain a residue mainly containing zinc hydroxide. In step A, the iron-containing residue XIII, the iron hydroxide residue XV, the dust (thickener cake) Xa, the dust (thickener cake) IVa, and the dust V for moisture adjustment,
VI, VII and VIII were mixed to obtain a raw material for producing a sintered ore. Table 3 shows the chemical composition of the zinc hydroxide (zinc refining raw material) obtained in the step B and the chemical composition of the raw material for sinter production obtained in the step A, respectively.
【００３９】[0039]
【表３】 [Table 3]
【００４０】表３の比率に示したように，含亜鉛ダスト
類の大部分（９８.８％）は焼結鉱製造用原料として回
収できた。As shown in the ratios in Table 3, most of the zinc-containing dusts (98.8%) could be recovered as raw materials for producing sinter.
【００４１】なお，中和処理後の再生水から検出された
元素は，表４に示すように，微量の亜鉛と鉛を含有する
のみであり，再生水はダスト処理もしくは製鉄プロセス
で利用可能なものであった。As shown in Table 4, the elements detected in the reclaimed water after the neutralization treatment contained only a trace amount of zinc and lead, and the reclaimed water could be used in the dust treatment or ironmaking process. there were.
【００４２】[0042]
【表４】 [Table 4]
【００４３】次に，先に図２で説明した処理工程（特公
平３−６２７７２号の処理方法）により含亜鉛ダスト類
を処理した比較例を示す。本発明の実験例と全く同じ，
表１に示した配合率の各種ダストを用いて比較実験を行
った。先ず，Ｉ'，III'，IＶ'の各ダストを工程Ａ'にお
いて分別採集と湿式分級し，Ｚｎ含有量が２５.９ｍａ
ｓｓ％の高亜鉛ダストＸｂ'，IＶｂ'を得た。Next, a comparative example in which zinc-containing dusts are treated by the treatment process described in FIG. 2 (treatment method of Japanese Patent Publication No. 3-62772) will be shown. Exactly the same as the experimental example of the present invention,
A comparative experiment was conducted using various dusts having the mixing ratios shown in Table 1. First, each dust of I ', III', and IV 'was separately collected and wet classified in step A', and the Zn content was 25.9 ma.
High zinc dust Xb 'and IVb' of ss% were obtained.
【００４４】工程Ｂ'において，この高亜鉛ダストＸ
ｂ'，IＶｂ’に環境集塵ダストII'を混合して，脱水
し，更に乾ダストＶ'，ＶIII'を混合して水分調整し，
セメント製造用原料を得た。また，工程Ａ'において，
各処理を行うことにより焼結鉱製造用原料を得た。これ
らセメント製造用原料と焼結鉱製造用原料の比率と化学
組成を表５に示す。In step B ', the high zinc dust X
b ′ and IVb ′ are mixed with environmental dust collection II ′ and dehydrated, and further dry dusts V ′ and VIII ′ are mixed to adjust water content,
A raw material for cement production was obtained. Also, in the process A ′,
A raw material for producing a sintered ore was obtained by performing each treatment. Table 5 shows the ratio and chemical composition of these raw materials for producing cement and raw materials for producing sintered ore.
【００４５】[0045]
【表５】 [Table 5]
【００４６】その結果，比較例においては，焼結鉱製造
用原料として回収できたのは全体の６８.２％となり，
本発明実験例（９８.８％）は比較例に比べて焼結鉱製
造用原料の回収率が約１.４倍程度優れていることが分
かった。As a result, in the comparative example, 68.2% of the total could be recovered as the raw material for producing the sintered ore,
It was found that the experimental example of the present invention (98.8%) was about 1.4 times more excellent in recovery rate of the raw material for sinter production than the comparative example.
【００４７】なお，比較例の処理方法にあっては，ダス
ト処理で発生した高アルカリ廃水ＸIV'を，図２に示す
ように，更に中和槽１７'に入れ，硫酸を添加して中和
処理しなければ再生水が得られなかった。比較例におい
て，表１の配合比のダスト１ｔに対して２０％濃度の硫
酸を１８ｋｇ添加する必要があった。これに対し，本発
明実施例では浸出槽１３において既に酸を添加している
ため，中和用の硫酸は不要であった。In the treatment method of the comparative example, the highly alkaline wastewater XIV 'generated by the dust treatment is further put in a neutralization tank 17' and neutralized by adding sulfuric acid as shown in FIG. Recycled water could not be obtained without treatment. In the comparative example, it was necessary to add 18 kg of sulfuric acid having a concentration of 20% to 1 t of the dust having the compounding ratio shown in Table 1. On the other hand, in the example of the present invention, since acid was already added in the leaching tank 13, sulfuric acid for neutralization was unnecessary.
【００４８】[0048]
【発明の効果】本発明によれば，分別採集や湿式分級で
発生したアルカリ廃水を用いて浸出液を中和させている
ので，新たなアルカリ性の中和剤などを必要とせず，経
済的である。また，製鉄所で発生するダスト類を一括処
理することによって，そのほとんどを製鉄所内部で消費
可能な焼結鉱製造用原料とすることができ，優れた省資
源化を実現できる。しかも，回収される水酸化亜鉛は，
亜鉛含有量が高く，十分に亜鉛製錬原料として利用でき
る。なお，本発明のように，予め分別採集及び湿式分級
で分離してから高亜鉛ダストに酸を接触させることとす
ると，酸使用量が少なくて済み，効率的である。また，
従来のように高アルカリ廃水の中和に酸を添加していた
場合に比べ，酸の使用量を少なくすることも可能であ
る。According to the present invention, since the leachate is neutralized by using the alkaline waste water generated by the separate collection and the wet classification, a new alkaline neutralizing agent is not required and it is economical. . In addition, by collectively treating the dust generated in the steel mill, most of it can be used as a raw material for sinter production that can be consumed inside the steel mill, and excellent resource saving can be realized. Moreover, the recovered zinc hydroxide is
It has a high zinc content and can be fully used as a zinc smelting raw material. If the acid is brought into contact with the high-zinc dust after it has been separated by separate collection and wet classification as in the present invention, the amount of acid used is small and efficient. Also,
It is also possible to reduce the amount of acid used, as compared with the conventional case where acid was added to neutralize highly alkaline wastewater.
【図１】本発明の処理方法の代表例を示す工程図FIG. 1 is a process chart showing a typical example of a processing method of the present invention.
【図２】従来の処理法の一例を示す工程図FIG. 2 is a process chart showing an example of a conventional processing method.
Claims (4)
で発生する含亜鉛ダスト類を分別採集または湿式分級す
ることにより低亜鉛ダストと高亜鉛ダストとに分離し，
該高亜鉛ダストに酸を接触させて亜鉛を浸出させた後，
低亜鉛ダストと浸出液に固液分離し，該浸出液を上記分
別採集または湿式分級した際に発生したアルカリ性の廃
水を用いて中和させて水酸化亜鉛を析出させる製鉄所で
発生するダスト類の処理方法。1. A low-zinc dust and a high-zinc dust are separated by separately collecting or wet-classifying zinc-containing dust generated in an iron-making, steel-making and rolling iron-making integrated process,
After contacting the high zinc dust with an acid to leach zinc,
Solid-liquid separation into low-zinc dust and leachate, which is neutralized with alkaline wastewater generated when the leachate is separately collected or wet classified to precipitate zinc hydroxide. Method.
利用する請求項１の製鉄所で発生するダスト類の処理方
法。2. The method for treating dusts generated at an iron mill according to claim 1, wherein low zinc dust is used as a raw material for producing a sintered ore.
る請求項１または２の製鉄所で発生するダスト類の処理
方法。3. The method for treating dusts generated at an iron mill according to claim 1 or 2, wherein zinc hydroxide is used as a zinc refining raw material.
として析出回収し，その後浸出液を中和させて水酸化亜
鉛を析出させる請求項１〜３の何れかの製鉄所で発生す
るダスト類の処理方法。4. Dust generated at an iron mill according to claim 1, wherein iron dissolved in the leachate is deposited and recovered in advance as iron hydroxide, and then the leachate is neutralized to deposit zinc hydroxide. Processing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26410793A JPH0797638A (en) | 1993-09-29 | 1993-09-29 | Treatment of dust kinds produced in iron works |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26410793A JPH0797638A (en) | 1993-09-29 | 1993-09-29 | Treatment of dust kinds produced in iron works |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0797638A true JPH0797638A (en) | 1995-04-11 |
Family
ID=17398607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26410793A Withdrawn JPH0797638A (en) | 1993-09-29 | 1993-09-29 | Treatment of dust kinds produced in iron works |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0797638A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100309782B1 (en) * | 1997-11-29 | 2002-04-17 | 이구택 | Fabrication method of sintered ore using iron-laden dust generated during ironmaking process |
| JP2003524070A (en) * | 2000-02-23 | 2003-08-12 | レキュパック | Steelworks dust treatment method |
| KR100400415B1 (en) * | 1999-06-11 | 2003-10-01 | 주식회사 포스코 | HIGH Zn SLUDGE CAKE PRODUCING DEVICE OF BLAST FURNACE THICKENER |
| JP2013010974A (en) * | 2011-06-28 | 2013-01-17 | Jfe Steel Corp | Method for collecting converter dust |
| JP2016194103A (en) * | 2015-03-31 | 2016-11-17 | 株式会社神戸製鋼所 | Dust recovery method |
| JP2017137578A (en) * | 2016-02-02 | 2017-08-10 | Ｊｆｅスチール株式会社 | Method for separating zinc, method for producing zinc material, and method for producing iron material |
| JP2019189898A (en) * | 2018-04-23 | 2019-10-31 | 住友金属鉱山株式会社 | Manufacturing method of zinc oxide ore |
| JP2020056089A (en) * | 2018-10-04 | 2020-04-09 | Ｊｆｅスチール株式会社 | Method for treating iron-containing dust |
| JP2021507983A (en) * | 2017-12-22 | 2021-02-25 | アルセロールミタル | How to treat iron-containing sludge |
-
1993
- 1993-09-29 JP JP26410793A patent/JPH0797638A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100309782B1 (en) * | 1997-11-29 | 2002-04-17 | 이구택 | Fabrication method of sintered ore using iron-laden dust generated during ironmaking process |
| KR100400415B1 (en) * | 1999-06-11 | 2003-10-01 | 주식회사 포스코 | HIGH Zn SLUDGE CAKE PRODUCING DEVICE OF BLAST FURNACE THICKENER |
| JP2003524070A (en) * | 2000-02-23 | 2003-08-12 | レキュパック | Steelworks dust treatment method |
| JP2013010974A (en) * | 2011-06-28 | 2013-01-17 | Jfe Steel Corp | Method for collecting converter dust |
| JP2016194103A (en) * | 2015-03-31 | 2016-11-17 | 株式会社神戸製鋼所 | Dust recovery method |
| JP2017137578A (en) * | 2016-02-02 | 2017-08-10 | Ｊｆｅスチール株式会社 | Method for separating zinc, method for producing zinc material, and method for producing iron material |
| JP2021507983A (en) * | 2017-12-22 | 2021-02-25 | アルセロールミタル | How to treat iron-containing sludge |
| JP2019189898A (en) * | 2018-04-23 | 2019-10-31 | 住友金属鉱山株式会社 | Manufacturing method of zinc oxide ore |
| JP2020056089A (en) * | 2018-10-04 | 2020-04-09 | Ｊｆｅスチール株式会社 | Method for treating iron-containing dust |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5667553A (en) | Methods for recycling electric arc furnace dust | |
| CN101508426B (en) | Method for separating tellurium from tellurium slag | |
| JPH10512926A (en) | Hydrometallurgical treatment of smoke | |
| CN111647754A (en) | Comprehensive utilization method of zinc-containing dust and sludge in steel plant | |
| CN108754148A (en) | A kind of processing method of cupric, manganese, cobalt, zinc, nickel heavy metal waste slag recycling | |
| CN111394582A (en) | Copper-nickel sludge resource recycling process | |
| CN106119556A (en) | A kind of Application way of steel plant zinc smoke ash | |
| AU710302B2 (en) | Method for recovering metal and chemical values | |
| JP2021191890A (en) | Co2 based hydrometallurgical multistage reaction and separation system | |
| JP2002511527A (en) | Steel mill dust treatment method by wet processing | |
| JPH0797638A (en) | Treatment of dust kinds produced in iron works | |
| CN105349792A (en) | Process for recycling brass furnace slag | |
| WO1997049637A1 (en) | Beneficiation of furnace dust for the recovery of chemical and metal values | |
| CN113787085A (en) | Method for extracting Fe, Zn and Pb from electric furnace dust removal ash and realizing high-value utilization | |
| WO2023193714A1 (en) | Method and system for coupling copper slag recycling with co2 mineralization based on industrial solid waste | |
| US5855645A (en) | Production of more concentrated iron product from industrial waste materials streams | |
| CN105399132B (en) | A kind of technique for preparing basic copper chloride and basic zinc chloride with brass clinker and flue dust containing zinc | |
| CA2199268C (en) | Method for recovering metal and chemical values | |
| CN106676275A (en) | Vanadium extraction method based on waste steel slag and acid-base property waste water | |
| JP6493423B2 (en) | Method for separating zinc, method for producing zinc material, and method for producing iron material | |
| WO1981003500A1 (en) | Heavy metal recovery in ferrous metal production processes | |
| CA1177257A (en) | Method for processing sulphidic zinc ores | |
| EP0040659B1 (en) | Heavy metal recovery in ferrous metal production processes | |
| CN106115769A (en) | A kind of low-grade Application way containing unvulcanised state zinc material | |
| RU2175991C1 (en) | Manganese ore processing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20001226 |