JPH0713244B2 - A method for recovering coarse iron powder from converter dust without leaving machining strain - Google Patents
A method for recovering coarse iron powder from converter dust without leaving machining strainInfo
- Publication number
- JPH0713244B2 JPH0713244B2 JP61104419A JP10441986A JPH0713244B2 JP H0713244 B2 JPH0713244 B2 JP H0713244B2 JP 61104419 A JP61104419 A JP 61104419A JP 10441986 A JP10441986 A JP 10441986A JP H0713244 B2 JPH0713244 B2 JP H0713244B2
- Authority
- JP
- Japan
- Prior art keywords
- iron powder
- dust
- coarse
- coarse iron
- magnetic separation
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 65
- 239000000428 dust Substances 0.000 title claims description 35
- 238000000034 method Methods 0.000 title claims description 18
- 238000003754 machining Methods 0.000 title 1
- 239000012535 impurity Substances 0.000 claims description 16
- 238000007885 magnetic separation Methods 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 7
- 239000011362 coarse particle Substances 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 239000012298 atmosphere Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 7
- 235000011941 Tilia x europaea Nutrition 0.000 description 7
- 229910000514 dolomite Inorganic materials 0.000 description 7
- 239000010459 dolomite Substances 0.000 description 7
- 239000004571 lime Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 238000001000 micrograph Methods 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 238000010306 acid treatment Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 150000007514 bases Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000009920 food preservation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【発明の詳細な説明】 ＜発明の目的＞ 産業上の利用分野 本発明は転炉ダストから加工歪を残すことなく粗粒鉄粉
を回収する方法に係り、詳しくは、ボールミルなどの破
砕や磨砕などの工程を介在させることなく、転炉ダスト
中から価値の高い粗粒鉄粉を加工歪を残すことなく効果
的に回収する方法に係る。DETAILED DESCRIPTION OF THE INVENTION <Purpose of the Invention> Industrial field of application The present invention relates to a method for recovering coarse iron powder from converter dust without leaving a processing strain, and more specifically, to crushing or polishing a ball mill or the like. The present invention relates to a method of effectively recovering high-value coarse iron powder from converter dust without leaving a processing strain, without involving a process such as crushing.
従来の技術 製鉄所における転炉製鋼において、湿式集塵処理時に得
られるダストの発生量は、例えば、250t/炉２基操業規
模の条件で約600t/日と極めて多く、しかも、その組成
は金属鉄の成分が60〜70％と高いのでその有効利用は工
業的メリットの極めて大きいものである。2. Description of the Related Art In converter steelmaking at steel mills, the amount of dust generated during wet dust collection is, for example, 250 tons / 600 t / day under the condition of operating two furnaces, and its composition is metallic. Since the iron content is as high as 60 to 70%, its effective use is extremely industrially advantageous.
しかし、このダスト中にはCaO、SiO2などのスラグ成分
も多量に含有していることから、従来では、これを有効
に活用する方法が無く、そのままの状態で高炉用焼結鉱
あるいはペレットの原料の一部として扱われ、非常に価
値の低いものとして評価されていた。However, since this dust also contains a large amount of slag components such as CaO and SiO 2 , there is no conventional method to effectively utilize it, and the sinter or pellets for blast furnaces as they are cannot be used as they are. It was treated as a part of the raw material and was evaluated as having very low value.
一方、金属鉄粉の利用法は従来から種々開発されてお
り、これらの中で代表的例としては粉末冶金用、溶接棒
用、化学カイロ用および食品保存などのための脱酸剤用
などがある。On the other hand, various methods of utilizing metallic iron powder have been developed in the past, and typical examples thereof include powder metallurgy, welding rods, chemical warmers, and deoxidizers for food preservation. is there.
これら工業的に使用される金属鉄粉の99％は噴霧法と還
元法によって製造されるが、製造工程が複雑であった
り、高品位原料を必要とする等の問題点を有していた。99% of these industrially used metallic iron powders are produced by the spraying method and the reduction method, but they have problems such as complicated manufacturing processes and the need for high-quality raw materials.
そこで、金属鉄が多量に含有されている転炉ダストを回
収し、目的に応じて適当な処理工程を加えることによっ
て、付加価値の高い有用なものにする技術が提案されて
いる。Therefore, a technique has been proposed in which converter dust containing a large amount of metallic iron is recovered and an appropriate treatment step is added according to the purpose to make it useful with high added value.
例えば、特開昭55−14825号公報には、回収ダストの純
度を上げる際に、ボールミル等で粉砕後、選鉱する方法
が示されているが、この方法では、 （１）鉄粉中に加工歪が残留し、次工程で焼なまし等の
処理が必要である。For example, Japanese Patent Application Laid-Open No. 55-14825 discloses a method of pulverizing with a ball mill or the like and then beneficiation in order to increase the purity of recovered dust. In this method, (1) processing into iron powder Strain remains, and it is necessary to perform a process such as annealing in the next step.
（２）石灰、ドロマイト等の不純物も粉砕されるが、表
面に付着した鉄ダストを分離することはできず、磁選し
ても除去は難かしい。(2) Impurities such as lime and dolomite are also crushed, but iron dust adhering to the surface cannot be separated, and it is difficult to remove them even by magnetic separation.
（３）粗粒ダストの粗径（≦500μｍ）では表面の不純
物層をボールミル等で剥離することは難かしい。(3) It is difficult to peel off the impurity layer on the surface by a ball mill or the like when the coarse dust has a coarse diameter (≦ 500 μm).
等の問題がある。There is a problem such as.
更に、特開昭59−1602号公報においては、不純物層を0.
3〜0.9Nの酸で処理した後、衝撃圧縮粉砕するため、前
記（１）と同様な問題を生じ、また、鉄粉より鉄の溶出
を防ぐ程度の酸処理では、混入した不純物に付着した鉄
ダスト層を溶出するには長時間を要し、磁選による効果
を低下させる。Furthermore, in Japanese Patent Laid-Open No. 59-1602, an impurity layer of 0.
After treatment with an acid of 3 to 0.9 N, impact compression crushing occurs, so the same problem as in (1) above occurs, and with acid treatment to the extent that iron elution from iron powder is prevented, it adheres to the impurities that have mixed in. It takes a long time to elute the iron dust layer, which reduces the effect of magnetic separation.
発明が解決しようとする問題点 本発明はこれらの問題点の解決を目的とし、具体的に
は、単純な工程で回収鉄粉の品位を向上し、回収鉄粉中
に加工歪を残さず、また、粉砕による不純物の粉化混入
の無い転炉ダストから鉄粉の回収法を提供することを目
的とする。Problems to be Solved by the Invention The present invention aims to solve these problems, specifically, improves the quality of the recovered iron powder in a simple process, leaving no processing strain in the recovered iron powder, Another object of the present invention is to provide a method for recovering iron powder from converter dust that is free from pulverization and contamination of impurities.
＜発明の構成＞ 問題点を解決するための手段ならびにその作用 すなわち、本発明方法は転炉より発生するダストを湿式
集塵した集塵水中より、粒径の大きいダストを優先的に
沈降分離する第１工程と、この沈降分離した粗粒ダスト
を乾燥後、500μｍ以下のサイズを分級分離する第２工
程と、500μｍ以下に分級分離した粗粒ダストを磁選し
て粗粒鉄粉をえて、この粗粒鉄粉を１〜1ONの塩酸水溶
液で処理して表面不純物を溶解除去する第３工程と、こ
の表面不純物を溶解除去した粗粒鉄粉を非酸化性雰囲気
下で乾燥してから、再び磁選して不純物を分離する第４
工程とよりなることを特徴とする。<Structure of the Invention> Means for Solving the Problem and Its Action That is, the method of the present invention preferentially sediments and separates the dust having a large particle size from the dust collecting water in which the dust generated from the converter is wet-collected. The first step and the second step of drying the sedimented and separated coarse particles and then classifying and separating the particles of 500 μm or less in size, and the magnetic separation of the coarse particles of 500 μm or less to obtain coarse iron powder. The third step of treating the coarse iron powder with a 1 to 1 ON hydrochloric acid aqueous solution to dissolve and remove the surface impurities, and drying the coarse iron powder having the surface impurities dissolved and removed in a non-oxidizing atmosphere, and then again. Fourth to separate impurities by magnetic separation
It is characterized by comprising steps.
以下、図面によって本発明の構成ならびに作用を説明す
ると、次の通りである。The structure and operation of the present invention will be described below with reference to the drawings.
第１図はスラリーダストの粒子構造を示す顕微鏡写真で
あり、第２図は粗粒鉄粉の粒子構造を示す顕微鏡写真で
あり、第３図（ａ）、（ｂ）および（ｃ）はそれぞれ粗
粒鉄粉の粒子構造を示す顕微鏡写真であり、第４図は実
施例に使用した沈降分離ピットの縦断面図である。FIG. 1 is a photomicrograph showing the particle structure of slurry dust, FIG. 2 is a photomicrograph showing the particle structure of coarse iron powder, and FIGS. 3 (a), (b) and (c) are respectively FIG. 4 is a micrograph showing the particle structure of coarse iron powder, and FIG. 4 is a vertical cross-sectional view of the sedimentation separation pit used in the examples.
転炉排ガス中に持ち去られるダストの成分および性状は
粗粒鉄粉の物理的形状が他の成分と明らかに異なり、こ
れを利用することにより容易に分離でき、鉄品位の向上
が可能であるとの知見から本発明の完成に至ったもので
ある。The composition and properties of the dust carried away in the converter exhaust gas are clearly different from those of the other components in the physical shape of the coarse iron powder.By using this, it is possible to easily separate and improve the iron quality. Based on the above findings, the present invention has been completed.
すなわち、第１表に示す如く、本発明の対象とする粗粒
鉄粉は他の成分とは明らかに形状が異なることおよび粗
粒鉄粉、石灰、ドロマイト、鉄鉱石、Mn鉱石の表面には
スラリーダストが付着していることが分る。 That is, as shown in Table 1, the coarse iron powder targeted by the present invention is obviously different in shape from other components, and the surface of the coarse iron powder, lime, dolomite, iron ore and Mn ore is It can be seen that slurry dust is attached.
本発明では、まず、第１工程でスラリー以外の粒径40μ
ｍ以上のような比較的粒径の大きい粗粒ダストを沈降分
離させる。この場合、沈降分離させる方法については特
に限定しないが、第４図にその一例を示す。In the present invention, first, in the first step, the particle size other than slurry is 40 μm.
Coarse-grained dust having a relatively large particle size of m or more is settled and separated. In this case, the method of sedimentation separation is not particularly limited, but an example thereof is shown in FIG.
第２工程では第１工程で得られた粗粒ダストを乾燥後、
目的とする粗粒鉄粉を回収するため粒径500μｍ以下の
サイズに分級する。In the second step, after drying the coarse particle dust obtained in the first step,
In order to recover the target coarse iron powder, it is classified to a size of 500 μm or less.
これは粗粒鉄粉の粒度分布は500μｍ以下のサイズが80
％以上であることによる。This is because the coarse iron powder has a particle size distribution of less than 500 μm
% Or more.
第３工程では500μｍ以下に分級した粗粒鉄粉を磁選し
て、石灰、ドロマイト等の非磁性物質をある程度分離し
た後（表面に鉄ダストが付着している石灰、ドロマイト
等は磁選で除去できない）、１〜10Nの酸溶液で粗粒鉄
粉表面のスラリーダスト付着層および石灰、ドロマイト
等の表面付着層を完全に溶出させる。この酸処理の目的
とするところは、粗粒鉄粉の表面不純物を酸処理により
溶解除去し、次工程で粉砕、剥離することがないように
する点と、混入している石灰、ドロマイト等の表面付着
ダストをも浸出し、次処理での磁選効率を増加させる点
にある。この場合、混入するCaO、CaCO3等の塩基性化合
物による酸の中和を考慮すると、酸濃度としては1N以上
の強酸での処理が必要である。酸の種類としては硫酸、
硝酸のような酸化力をもつ酸は高濃度では鉄を酸化し不
動態化させるので好ましくなく、塩酸が好ましい。ま
た、10N以上の塩酸による処理は酸の入手等の面で実用
的でない。In the third step, after coarse iron powder classified to 500 μm or less is magnetically separated to separate non-magnetic substances such as lime and dolomite to some extent (lime and dolomite with iron dust on the surface cannot be removed by magnetic separation). ), 1 to 10N acid solution is used to completely elute the slurry dust adhesion layer on the surface of the coarse iron powder and the surface adhesion layer such as lime and dolomite. The purpose of this acid treatment is to remove the surface impurities of the coarse iron powder by acid treatment so that they will not be crushed or peeled off in the next step, and that the mixed lime, dolomite, etc. It also lies in the point that the dust adhering to the surface is also leached out to increase the magnetic separation efficiency in the next treatment. In this case, considering the neutralization of the acid with a basic compound such as CaO or CaCO 3 mixed in, it is necessary to treat with a strong acid having an acid concentration of 1 N or more. The type of acid is sulfuric acid,
An acid having an oxidizing power such as nitric acid is not preferable because it oxidizes and passivates iron at a high concentration, and hydrochloric acid is preferable. Moreover, the treatment with hydrochloric acid of 10 N or more is not practical in terms of obtaining the acid.
第４工程ではN2、Ar、CO2等の非酸化性ガス雰囲気下の
もとで25〜100℃で乾燥後、最終磁選を行ない、表面よ
り不純物層を浸出除去した石灰、ドロマイト類を分離す
る。In the 4th step, after drying in a non-oxidizing gas atmosphere such as N 2 , Ar, and CO 2 at 25 to 100 ° C, final magnetic separation is performed to separate lime and dolomite from which the impurity layer is leached and removed from the surface. To do.
以上の処理により転炉ダストよりＭ・Feは98％以上の粒
状鉄粉を回収することができる。By the above processing, 98% or more of granular iron powder containing M / Fe can be recovered from converter dust.
また、浸出の際に生じるH2ガスや第１鉄塩溶液は、前者
は還元ガスとして、後者は酸化、固化してフェライト原
料に利用することもできる。Further, the H 2 gas or the ferrous salt solution generated during leaching can be used as a reducing gas for the former and oxidized and solidified for the latter to be used as a ferrite raw material.
実施例 以下、実施例によって更に説明する。Examples Hereinafter, examples will be further described.
第１工程；第４図に示す沈降ピットを使用し、スラリー
と粗粒ダストを分離した。これにより全発生ダストの25
〜30重量％が分離でき、粗粒ダストの金属鉄（以下、Ｍ
・Feで表す）含有率は60.4％（第２表サンプルＡ）であ
った。First step: The sedimentation pit shown in FIG. 4 was used to separate the slurry from coarse-grained dust. As a result, 25
~ 30% by weight can be separated, and coarse iron dust metal iron (hereinafter M
The content rate (expressed by Fe) was 60.4% (Sample A in Table 2).
第２工程；粗粒ダスト500gを採取し、100〜107℃で２時
間保持し乾燥させた。これにより粗粒ダスト中の水分は
10.3％から3.2％減少し、Ｍ・Feは65.0％に上昇した
（第２表サンプルＢ）。その後、350μｍ以下に分級し
た結果、Ｍ・Feは82.2％にまで上昇した（第２表サンプ
ルＣ）。Second step: 500 g of coarse-grained dust was collected, kept at 100 to 107 ° C. for 2 hours, and dried. As a result, the water content in the coarse-grained dust
It decreased by 3.2% from 10.3% and M · Fe increased to 65.0% (Sample B in Table 2). After that, as a result of classification to 350 μm or less, M · Fe increased to 82.2% (Sample C in Table 2).
第３工程;350μｍ以下の分級品を磁選後（第２表サンプ
ルＤ）、5N塩酸1.5l中、液温15℃で３分間機械撹拌して
浸出した後、N2雰囲気下で過し残渣の乾燥を行なう
と、Ｍ・Fe97.8％の鉄粉を得ることができた（第２表サ
ンプルＥ）。Third step: After magnetic separation of a classified product of 350 μm or less (Sample D in Table 2), mechanical leaching was performed for 3 minutes at a liquid temperature of 15 ° C. in 1.5 L of 5N hydrochloric acid, and then leaching was performed under an N 2 atmosphere to remove residue. After drying, an iron powder containing 97.8% M.Fe could be obtained (Sample E in Table 2).
第４工程；更に、これを磁選することによりＭ・Fe98.1
％の鉄粉を得ることができた（第２表サンプルＦ）。4th step; M.Fe98.1 by magnetic separation
% Iron powder could be obtained (Sample F in Table 2).
精製に伴なう試料重量の推移を第３表に示す。粗粒ダス
トを基準としての鉄粉収率は48.9％であった。Table 3 shows the change in the sample weight accompanying the purification. The iron powder yield was 48.9% based on the coarse dust.
＜発明の効果＞ 以上説明したように、本発明は、転炉より発生するダス
トを湿式集塵した集塵水中より、粒径の大きいダストを
優先的に沈降分離する第１工程と、分離した粗粒ダスト
を乾燥後、500μｍ以下のサイズを分級分離する第２工
程と、前記500μｍ以下のダストを磁選後、１〜10Nの塩
酸水溶液で処理して、表面不純物を溶解して過分離す
る第３工程と、過分離した粗粒鉄粉を非酸化性雰囲気
下で乾燥後、磁選して不純物を分離する第４工程とより
なることを特徴とする転炉ダストから粗粒鉄粉の回収法
である。 <Effects of the Invention> As described above, the present invention is separated from the first step of preferentially settling and separating the dust having a large particle size from the dust-collecting water in which the dust generated from the converter is wet-collected. After the coarse particles are dried, the second step of classifying and separating the size of 500 μm or less, and the magnetic separation of the particles of 500 μm or less, and the treatment with a 1-10 N hydrochloric acid aqueous solution to dissolve surface impurities and superseparate A method for recovering coarse iron powder from converter dust, comprising three steps and a fourth step of drying the excessively separated coarse iron powder in a non-oxidizing atmosphere and separating the impurities by magnetic separation. Is.
この回収に当ってボールミルなどの磨砕が全く介在しな
いため、得られる粗粒鉄粉には全く加工歪が残らない。Since no grinding by a ball mill or the like is involved in this recovery, no processing strain remains in the coarse iron powder obtained.
また、磁選をくり返し、とくに、次の磁選に先立って塩
酸によって不純物が溶解除去されるため、鉄が不動態化
されることがなく、磁選の効果が十分に発揮できる。Further, the magnetic separation is repeated, and in particular, the impurities are dissolved and removed by hydrochloric acid prior to the next magnetic separation, so that iron is not passivated and the effect of magnetic separation can be sufficiently exhibited.
このため、大量生産向きの単純な処理工程によって高品
位の鉄粉を回収することができ、粉末冶金用、溶接棒
用、化学カイロ用および食用保存などのための脱酸剤用
鉄粉として高付加価値化をはかることができる。For this reason, high-quality iron powder can be recovered by a simple treatment process suitable for mass production, and it can be recovered as a high-quality iron powder for deoxidizers for powder metallurgy, welding rods, chemical warmers, and food storage. It is possible to add value.
【図面の簡単な説明】 第１図はスラリーダストの粒子構造を示す顕微鏡写真、
第２図は粗粒鉄粉の粒子構造を示す顕微鏡写真、第３図
（ａ）、（ｂ）および（ｃ）はそれぞれ粗粒鉄粉の粒子
構造を示す顕微鏡写真、第４図は実施例に使用した沈降
分離ピットの縦断面図である。 符号１……スラリーダスト ２……粗粒ダスト ３……抜き取口BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a micrograph showing the particle structure of slurry dust,
2 is a micrograph showing the particle structure of coarse iron powder, FIGS. 3 (a), (b) and (c) are micrographs showing the particle structure of coarse iron powder, and FIG. 4 is an example. FIG. 3 is a vertical cross-sectional view of the sedimentation separation pit used in FIG. Reference numeral 1 ... Slurry dust 2 ... Coarse-grained dust 3 ... Extraction port
Claims (1)
塵水中より、粒径の大きいダストを優先的に沈降分離す
る第１工程と、この沈降分離した粗粒ダストを乾燥後、
500μｍ以下のサイズを分級分離する第２工程と、前記5
00μｍ以下に分級分離した粗粒ダストを磁選して粗粒鉄
粉をえて、この粗粒鉄粉を１〜10Nの塩酸水溶液で処理
して表面不純物を溶解除去する第３工程と、この表面不
純物を溶解除去した粗粒鉄粉を非酸化性雰囲気下で乾燥
してから、再び磁選して不純物を分離する第４工程とよ
りなることを特徴とする転炉ダストから加工歪を残すこ
となく粗粒鉄粉を回収する方法。1. A first step of preferentially settling and separating dust having a large particle size from dust-collecting water obtained by wet collecting dust generated from a converter, and drying the settling-separated coarse-grained dust,
The second step of classifying and separating the size of 500 μm or less, and the above 5
The third step of magnetically separating coarse particles of dust separated to less than 00 μm to obtain coarse iron powder, treating the coarse iron powder with a 1 to 10 N hydrochloric acid aqueous solution to dissolve and remove surface impurities, and the surface impurities The method is characterized in that it comprises a fourth step in which the coarse iron powder from which the iron has been removed is dried in a non-oxidizing atmosphere, and then magnetic separation is carried out again to separate impurities. A method of collecting granular iron powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61104419A JPH0713244B2 (en) | 1986-05-06 | 1986-05-06 | A method for recovering coarse iron powder from converter dust without leaving machining strain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61104419A JPH0713244B2 (en) | 1986-05-06 | 1986-05-06 | A method for recovering coarse iron powder from converter dust without leaving machining strain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62260007A JPS62260007A (en) | 1987-11-12 |
| JPH0713244B2 true JPH0713244B2 (en) | 1995-02-15 |
Family
ID=14380174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61104419A Expired - Lifetime JPH0713244B2 (en) | 1986-05-06 | 1986-05-06 | A method for recovering coarse iron powder from converter dust without leaving machining strain |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0713244B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01215910A (en) * | 1988-02-23 | 1989-08-29 | Nisshin Steel Co Ltd | Manufacture of iron powder from converter dust |
| CN101708484B (en) * | 2008-10-28 | 2012-08-29 | 维克托·洛雷罗·多斯桑托斯 | Magnetic mechanical equipment, separation method of dust particles, metal component recovery system and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5950731B2 (en) * | 1978-03-28 | 1984-12-10 | 光和精鉱株式会社 | How to recover metallic iron powder from converter dust |
| JPS591602A (en) * | 1982-06-25 | 1984-01-07 | Nippon Kokan Kk <Nkk> | Production of iron powder for industrial purpose using converter off-gas dust |
-
1986
- 1986-05-06 JP JP61104419A patent/JPH0713244B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62260007A (en) | 1987-11-12 |
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