JP2022034653A - Method of recovering chromium-containing dust, method of producing iron manufacture raw material, and facility for recovering chromium-containing dust - Google Patents
Method of recovering chromium-containing dust, method of producing iron manufacture raw material, and facility for recovering chromium-containing dust Download PDFInfo
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- 239000000428 dust Substances 0.000 title claims abstract description 128
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 239000011651 chromium Substances 0.000 title claims abstract description 105
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 102
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 59
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 42
- 239000002994 raw material Substances 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000007885 magnetic separation Methods 0.000 claims abstract description 33
- 238000007670 refining Methods 0.000 claims abstract description 12
- 239000000696 magnetic material Substances 0.000 claims description 25
- 238000011084 recovery Methods 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000006148 magnetic separator Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000009628 steelmaking Methods 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 19
- 239000002245 particle Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 230000032683 aging Effects 0.000 description 8
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 7
- 229910000423 chromium oxide Inorganic materials 0.000 description 7
- 235000013980 iron oxide Nutrition 0.000 description 7
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000007664 blowing Methods 0.000 description 4
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000020169 heat generation Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000006249 magnetic particle Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- -1 Fe 2 O 3 Chemical class 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- QEFDIAQGSDRHQW-UHFFFAOYSA-N [O-2].[Cr+3].[Fe+2] Chemical compound [O-2].[Cr+3].[Fe+2] QEFDIAQGSDRHQW-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
本発明は、含クロム溶鉄の精錬工程で発生したクロム含有ダストを高効率で回収する方法に関し、その方法を用いた製鉄原料の製造方法およびその方法に用いる回収設備に関する。 The present invention relates to a method for recovering chromium-containing dust generated in a chromium-containing molten iron refining process with high efficiency, and to a method for producing a steelmaking raw material using the method and a recovery facility used for the method.
含クロム溶鉄の精錬処理においては、クロムを含有したダストが大量に発生する。このクロム含有ダストの大部分は、空気や水との反応によりすみやかに酸化される。一部は金属状態で存在するが、ハンドリング時にその酸化反応により発熱や発火の危険性があるため、保管時に前もってエージング処理により意図的に酸化反応を進めるのが一般的である。このため、クロム含有ダストは、酸化鉄および酸化クロムがほぼ大部分を占めるダストとなる。また、エージング中にダストの一部が塊成化し、粒度が増大する。 In the refining treatment of chromium-containing molten iron, a large amount of dust containing chromium is generated. Most of this chromium-containing dust is rapidly oxidized by the reaction with air and water. Although some of them exist in a metallic state, there is a risk of heat generation and ignition due to the oxidation reaction during handling, so it is common to intentionally proceed with the oxidation reaction by aging treatment in advance during storage. Therefore, the chromium-containing dust is dust in which iron oxide and chromium oxide occupy most of the dust. In addition, part of the dust agglomerates during aging, increasing the particle size.
ダスト中の酸化鉄および酸化クロムのうち、特に高価な酸化クロム分をステンレス鋼などクロム含有鋼溶製のための原料として有効にリサイクルすることは、近年の省資源化の流れでも重要な課題である。たとえば、特許文献１には、コークスを充てんした縦型炉などに、クロム含有ダストを吹き込み、溶融還元する技術が開示されている。また、特許文献２には、クロム含有ダストを還元焼結したのちに、転炉または溶銑搬送容器内に装入する方法等が開示されている。 Of the iron oxide and chromium oxide in the dust, the effective recycling of the particularly expensive chromium oxide as a raw material for melting chromium-containing steel such as stainless steel is an important issue in the recent trend of resource saving. be. For example, Patent Document 1 discloses a technique of blowing chromium-containing dust into a vertical furnace filled with coke and melting and reducing it. Further, Patent Document 2 discloses a method of reducing and sintering chromium-containing dust and then charging it into a converter or a hot metal transfer container.
特許文献３には、別途溶銑搬送容器にてクロム含有ダストのうち酸化鉄のみを選択的に還元抽出することで、該ダスト中に含有される酸化クロムを溶銑搬送容器内のスラグ中に濃縮し、クロム源として再利用する方法が開示されている。 In Patent Document 3, separately, by selectively reducing and extracting only iron oxide among the chromium-containing dust in the hot metal transport container, the chromium oxide contained in the dust is concentrated in the slag in the hot metal transport container. , A method of reusing as a chromium source is disclosed.
特許文献４には、マンガン酸化物含有物質を粉砕し、水中磁選によって該マンガン酸化物を分離する方法が開示されている。 Patent Document 4 discloses a method of pulverizing a manganese oxide-containing substance and separating the manganese oxide by magnetic separation in water.
しかしながら、上記従来の技術には、未だ解決すべき以下のような問題があった。
特許文献１や２に記載の方法では、酸化クロムの還元に際し、酸化鉄の還元分の熱補償も行う必要があるため、炭材やフェロシリコンなどの熱源を過剰に添加する必要があった。また、特許文献３に記載の技術では、連続操業時においては、溶銑鍋待機時間の長さによりクロム含有ダストのリサイクル可能量が制限される懸念があった。
However, the above-mentioned conventional technique still has the following problems to be solved.
In the methods described in Patent Documents 1 and 2, it is necessary to perform heat compensation for the reduced amount of iron oxide when reducing chromium oxide, so that it is necessary to excessively add a heat source such as a carbonaceous material or ferrosilicon. Further, in the technique described in Patent Document 3, there is a concern that the recyclable amount of chromium-containing dust is limited by the length of the hot metal pot waiting time during continuous operation.
特に、クロム含有ダストのクロム濃度は、精錬処理中のクロム濃度に依存するが、概ね１５％以下であり、クロム含有ダスト中の鉄濃度はそのクロム濃度の２倍程度もしくはそれ以上存在する。そのため、クロムが３０％程度含まれるクロム鉱石を還元添加する方法と比較すると、クロム酸化物の還元熱だけではなく、鉄酸化物の還元熱分の熱補償を行う必要があり、高コストでの処理にならざるを得なかった。加えて、クロム源を回収する際に、必ず鉄の回収が伴うため、クロム濃度が希釈されてしまう。その結果、追加でクロム源を投入しなければならない場合があった。 In particular, the chromium concentration of the chromium-containing dust depends on the chromium concentration during the refining treatment, but is generally 15% or less, and the iron concentration in the chromium-containing dust is about twice or more than the chromium concentration. Therefore, compared to the method of reducing and adding chromium ore containing about 30% of chromium, it is necessary to compensate not only the heat of reduction of chromium oxide but also the heat of reduction of iron oxide, which is a high cost. I had no choice but to process it. In addition, when the chromium source is recovered, iron is always recovered, so that the chromium concentration is diluted. As a result, it may be necessary to add an additional chromium source.
一方で、鉄濃度が高いことに着目し、鉄源としてダストをリサイクルする方法も考えられる。ところが、同時に溶鉄中のクロム濃度が増加してしまうため、製品のクロム規格上限を超えてしまう懸念や、脱りん効率の低下を招くおそれがある。したがって、リサイクル可能量がダスト中のクロム濃度によって制限されてしまうといった課題がある。 On the other hand, paying attention to the high iron concentration, a method of recycling dust as an iron source can be considered. However, at the same time, the chromium concentration in the molten iron increases, which may lead to a concern that the upper limit of the chromium standard of the product may be exceeded and a decrease in the dephosphorization efficiency. Therefore, there is a problem that the recyclable amount is limited by the chromium concentration in the dust.
また、特許文献４に記載の技術では、粉砕工程と磁選工程の２工程が必要となるため、設備規模および運転費用が増大するという課題がある。 Further, the technique described in Patent Document 4 requires two steps of a crushing step and a magnetic separation step, so that there is a problem that the equipment scale and the operating cost increase.
本発明は上記事情に鑑みてなされたものであり、クロム含有ダストを、事前にクロム濃度が高いダストと鉄濃度が高いダストに分離することで、クロム源としても鉄源としても高効率に回収する方法を提案し、その回収方法を用いた製鉄原料の製造方法を提案するとともに、クロム含有ダストの回収方法に用いて好適な回収設備を提供することを目的としている。 The present invention has been made in view of the above circumstances, and by separating the chromium-containing dust into dust having a high chromium concentration and dust having a high iron concentration in advance, the dust can be recovered with high efficiency as both a chromium source and an iron source. It is an object of the present invention to propose a method for recovering an iron-making raw material using the recovery method, and to provide a suitable recovery facility for the recovery method of chromium-containing dust.
前記課題を解決し上記の目的を実現するため開発した本発明は、下記の要旨構成に示すとおりである。即ち、本発明は、含クロム溶鉄の精錬工程で発生する排気中のクロム含有ダストの回収方法であって、前記排気中のクロム含有ダストを湿式で回収する湿式集塵工程と、該湿式集塵工程で発生した集塵水中のクロム含有ダストを水中で磁力により回収磁着物と回収非磁着物とに選別する水中磁選工程と、該水中磁選工程で選別された前記回収磁着物を含水ダストとして回収する磁着物回収工程と、前記水中磁選工程で選別された前記回収非磁着物を含水ケーキとして回収する非磁着物回収工程と、を有することを特徴とするクロム含有ダストの回収方法を提案する。 The present invention developed to solve the above problems and realize the above object is as shown in the following gist structure. That is, the present invention is a method for recovering chrome-containing dust in the exhaust generated in the smelting step of the chrome-containing molten iron, which is a wet dust collecting step for recovering the chrome-containing dust in the exhaust in a wet manner and the wet dust collecting. Dust collected in the process The chrome-containing dust in the water is collected by magnetic force in the water. We propose a method for recovering chromium-containing dust, which comprises a magnetic deposit recovery step and a non-magnetic deposit recovery step of recovering the recovered non-magnetic material selected in the underwater magnetic separation step as a water-containing cake.
また、本発明は、上記クロム含有ダストの回収方法で回収されたクロム含有ダストをクロム濃度によって選別することを特徴とする製鉄原料の製造方法を提案する。 The present invention also proposes a method for producing a raw material for steelmaking, which comprises sorting the chromium-containing dust recovered by the above-mentioned method for recovering chromium-containing dust according to the chromium concentration.
なお、本発明にかかる製鉄原料の製造方法においては、相対的にクロム濃度の高い一方をクロム含有鋼の精錬工程用のクロム源として、相対的にクロム濃度の低い他方を製精錬工程用の鉄源として、決定することがより好ましい解決手段になり得るものと考えられる。 In the method for producing a raw material for iron making according to the present invention, one having a relatively high chromium concentration is used as a chromium source for the refining process of chromium-containing steel, and the other having a relatively low chromium concentration is iron for the refining process. As a source, it is believed that determination can be a more preferred solution.
また、本発明は、含クロム溶鉄の精錬工程で発生する排気中のクロム含有ダストの回収設備であって、前記排気中のクロム含有ダストを湿式で回収する湿式集塵装置と、前記湿式集塵装置で発生した集塵水中のクロム含有ダストを水中で磁力により回収磁着物と回収非磁着物に選別する水中磁選装置と、前記水中磁選装置で選別された前記回収磁着物を含水ダストとして回収する磁着物回収装置と、前記水中磁選装置で選別された前記回収非磁着物を含水ケーキとして回収する非磁着物回収装置と、を備えることを特徴とするクロム含有ダストの回収設備を提供する。 Further, the present invention is a wet dust collector that recovers the chromium-containing dust in the exhaust generated in the refining process of the chromium-containing molten iron by a wet method, and the wet dust collector. Dust collected by the device Collects chrome-containing dust in water by magnetic force in water A submersible magnetic separator that sorts magnetic deposits and non-magnetic deposits, and the recovered magnetic deposits sorted by the underwater magnetic separator are recovered as water-containing dust. Provided is a chromium-containing dust recovery device comprising a magnetic deposit recovery device and a non-magnetic deposit recovery device for recovering the recovered non-magnetic deposit selected by the underwater magnetic separator as a water-containing cake.
以上説明したように、本発明によれば、クロム含有ダストを事前にクロム濃度が高いダストと鉄濃度が高いダストに分離することができるので、製鉄原料として製造でき、クロム源としても鉄源としても高効率にリサイクルすることが可能となる。 As described above, according to the present invention, the chromium-containing dust can be separated into dust having a high chromium concentration and dust having a high iron concentration in advance, so that it can be produced as a raw material for steelmaking and also as an iron source as a chromium source. Can be recycled with high efficiency.
クロム含有ダストの鉱物相は主として、Ｆｅ２Ｏ３やＦｅ３Ｏ４、ＦｅＯなどの鉄酸化物ならびに鉄およびクロムを含有する金属分で構成されており、クロム酸化物は鉄酸化物に固溶する形で存在している。このうち金属分およびＦｅ３Ｏ４は強磁性を持ち、Ｆｅ２Ｏ３やＦｅＯは非磁性（常磁性）を示し、鉄－クロム酸化物の固溶体であるＦｅＯ・Ｃｒ２Ｏ３は弱磁性を持つなど、各鉱物相で磁性の違いがあるため、磁選分離を行うことで鉄分およびクロム分の分離が可能であると考えられる。特にクロム含有鋼を転炉で精錬した際に発生するダスト中にはＦｅ３Ｏ４の含有率が高いため、磁選分離を行うことでＦｅ３Ｏ４が磁着相に濃縮され、非磁着相にクロムが濃縮すると考えられる。 The mineral phase of chromium-containing dust is mainly composed of iron oxides such as Fe 2 O 3 , Fe 3 O 4 , and FeO, as well as metals containing iron and chromium, and the chromium oxide is solidly dissolved in the iron oxide. It exists in the form of. Of these, the metal content and Fe 3 O 4 have ferromagnetism, Fe 2 O 3 and FeO show non-magnetism (normal magnetism), and FeO and Cr 2 O 3 which are solid solutions of iron-chromium oxide have weak magnetism. Since there are differences in magnetism between each mineral phase, such as having, it is thought that iron and chromium can be separated by performing magnetic selection separation. In particular, since the content of Fe 3 O 4 is high in the dust generated when chromium-containing steel is refined in a converter, Fe 3 O 4 is concentrated in the magnetically deposited phase by magnetic separation and non-magnetization. It is thought that chromium is concentrated in the phase.
しかしながら、これらの鉱物相はダスト粒子内に共存しているため、磁選による分離効率を向上させるためには、ダスト粒径が小さいことが望ましい。集塵水処理設備にて処理されるダストは粒径５０μｍ以下の小粒径ダストであるが、そのまま乾燥させると、発熱や発火の危険性があるため、エージングを行っている。そのため、エージング工程で塊成化が進み、ダスト粒径が増大する。したがって、エージング後のダストを磁選処理するためには塊成化したダストを粉砕する必要がある。 However, since these mineral phases coexist in the dust particles, it is desirable that the dust particle size is small in order to improve the separation efficiency by magnetic separation. The dust treated by the dust collecting water treatment facility is a small particle size dust having a particle size of 50 μm or less, but if it is dried as it is, there is a risk of heat generation and ignition, so aging is performed. Therefore, agglomeration progresses in the aging step, and the dust particle size increases. Therefore, in order to magnetically separate the dust after aging, it is necessary to crush the agglomerated dust.
一方、湿式集塵処理において、精錬工程で発生するダストを集塵水に捕捉し、脱水処理が行われている。本発明にかかるクロム含有ダストの回収方法は、排気中のクロム含有ダストを湿式で回収する湿式集塵工程と、その湿式集塵工程で発生した集塵水中のクロム含有ダストを水中で磁力により回収磁着物と回収非磁着物とに選別する水中磁選工程と、その水中磁選工程で選別された回収磁着物を含水ダストとして回収する磁着物回収工程と、一方、回収非磁着物を含水ケーキとして回収する非磁着物回収工程と、を有するものである。本発明にかかるクロム含有ダストの回収方法では、脱水処理前の集塵水の状態のまま磁選処理を行うことで、発熱や発火の懸念がなく、かつ粉砕工程の必要なく十分に粒径の小さい粒度の条件で磁選をもちいて、鉄分とクロム分との分離が可能となる。 On the other hand, in the wet dust collecting treatment, the dust generated in the refining process is captured in the dust collecting water and dehydrated. The method for recovering chromium-containing dust according to the present invention is a wet dust collecting step of wetly recovering chromium-containing dust in exhaust, and a magnetic force of collecting chromium-containing dust in the dust collecting water generated in the wet dust collecting step. An underwater magnetic separation process for sorting into a magnetic substance and a recovered non-magnetic material, a magnetic material recovery process for recovering the recovered magnetic material selected in the underwater magnetic separation process as water-containing dust, and a recovery process for collecting the recovered non-magnetic material as a water-containing cake. It has a non-magnetic material recovery step. In the method for recovering chromium-containing dust according to the present invention, by performing the magnetic separation treatment in the state of the collected water before the dehydration treatment, there is no concern about heat generation or ignition, and the particle size is sufficiently small without the need for a crushing step. By using magnetic separation under the condition of particle size, it is possible to separate iron and chromium.
本発明を実施するための好適なクロム含有ダストの回収設備としては、排気中のクロム含有ダストを湿式で回収する湿式集塵装置と、その湿式集塵装置で発生した集塵水中のクロム含有ダストを水中で磁力により回収磁着物と回収非磁着物に選別する水中磁選装置と、その水中磁選装置で選別された回収磁着物を含水ダストとして回収する磁着物回収装置と、回収非磁着物を含水ケーキとして回収する非磁着物回収装置と、を備えるものである。ダストの集塵処理においては、大量のダストならびに集塵水が連続的に流入してくるため、ドラム型の磁選機を使用して連続的に磁選処理を行い、磁着物と非磁着物を別々に回収することが望ましい。 Suitable chrome-containing dust recovery equipment for carrying out the present invention includes a wet dust collector that wetly recovers chrome-containing dust in the exhaust, and chrome-containing dust in the dust collecting water generated by the wet dust collector. An underwater magnetic separator that sorts the collected magnetic material into a recovered magnetic material and a recovered non-magnetic material by magnetic force in water, a magnetic material recovery device that collects the recovered magnetic material selected by the underwater magnetic separation device as water-containing dust, and a water-containing recovery non-magnetic material. It is equipped with a non-magnetic material recovery device that collects as a cake. In the dust collection process, a large amount of dust and dust collection water flow in continuously, so the magnetic separation process is continuously performed using a drum-type magnetic separator, and the magnetic and non-magnetic particles are separated. It is desirable to collect it in.
上述したように、磁着物中にはＦｅ３Ｏ４を多く含み、つまり、鉄分の多いものが回収され、非磁着物中には、相対的にクロム分の濃化したものが回収される。このように回収されたダストは、それぞれ鉄源およびクロム源として製鉄原料となる。たとえば、磁選分離によって得られた、高クロム含有ダスト（回収非磁着物）は、クロム含有鋼の溶製時にクロム源として使用することで、効率よく有価金属であるクロムを有効利用することができ、製鋼用副原料として有用である。また、鉄濃度が高いダスト（回収磁着物）は、逆にクロム濃度が低いため、鉄源として、クロムを含有させる必要のない溶鋼の溶製時やクロムの希釈を必要とする場合、高炉原料として使用することで、効率よくリサイクルが可能である。 As described above, the magnetically packed material contains a large amount of Fe 3 O 4 , that is, the one having a high iron content is recovered, and the non-magnetically coated material is recovered with a relatively concentrated chromium content. The dust recovered in this way becomes an iron-making raw material as an iron source and a chromium source, respectively. For example, high chromium-containing dust (recovered non-magnetic deposit) obtained by magnetic separation can be used as a chromium source during melting of chromium-containing steel, so that chromium, which is a valuable metal, can be efficiently utilized. , Useful as an auxiliary material for steelmaking. On the contrary, dust with a high iron concentration (recovered magnetic deposit) has a low chromium concentration, so when melting molten steel that does not need to contain chromium as an iron source or when chromium dilution is required, it is a raw material for blast furnaces. By using it as a blast furnace, it can be efficiently recycled.
（実施例１）
処理Ｎｏ．１では、クロム含有鋼の溶製を行っている転炉から発生するダストのための湿式集塵装置の後にドラム型磁選機を設置した。そして、ダストを含有する集塵水をドラム型磁選機に通水して磁選処理を行い、磁着物と非磁着物に分けて回収した。
処理Ｎｏ．２では、比較例として、クロム含有鋼の溶製を行っている転炉から発生するダストの集塵水をそのまま脱水し、エージングした後のダストを乾式磁選処理した。処理Ｎｏ．３では、処理Ｎｏ．２と同様に、エージングした後のダストを粉砕処理し、乾式磁選を行った。磁選時のダスト平均粒度は、ふるい法を用い、質量基準で５０％通過粒径とした。
磁選処理実施前のダスト中の成分組成を質量％で表１に示す。また、処理Ｎｏ．１～３にかかる磁選条件および磁選処理後の組成を表２に示す。表１および２中の「Ｔ．Ｆｅ」は、全鉄濃度を表し、「Ｔ．Ｃｒ」は、全クロム濃度を表す。
(Example 1)
Processing No. In No. 1, a drum type magnetic separator was installed after the wet dust collector for dust generated from a converter that melts chromium-containing steel. Then, the dust-collecting water containing dust was passed through a drum-type magnetic separator to perform a magnetic separation process, and the dust-collected water was separated into magnetic and non-magnetic particles and recovered.
Processing No. In No. 2, as a comparative example, the dust collecting water of the dust generated from the converter for melting the chromium-containing steel was dehydrated as it was, and the dust after aging was subjected to dry magnetic separation treatment. Processing No. In No. 3, the processing No. In the same manner as in No. 2, the dust after aging was pulverized and subjected to dry magnetic separation. The average dust particle size at the time of magnetic separation was 50% passing particle size on a mass basis using a sieving method.
The composition of the components in the dust before the magnetic separation treatment is shown in Table 1 in mass%. In addition, processing No. Table 2 shows the magnetic separation conditions and the composition after the magnetic separation treatment according to 1 to 3. In Tables 1 and 2, "T.Fe" represents the total iron concentration, and "TCr" represents the total chromium concentration.
本発明を適用した処理Ｎｏ．１では、クロム含有鋼の溶製時に発生したダストの鉄分およびクロム分を効率的に分離することが可能となった。一方、処理Ｎｏ．２では、湿式集塵装置にて回収した集塵水を脱水処理後にエージング処理を行ったダストを用いて乾式磁選を行ったため、磁選処理時のダスト粒度が粗大化しており、磁選処理による鉄およびクロムの分離が十分でなかった。また、処理Ｎｏ．３のようにエージング後のダストを粉砕して磁選処理を行った場合は、鉄およびクロムの分離挙動は良好であったが、粉砕処理を行ったことによって、処理コストが増大した。 Processing No. to which the present invention is applied. In No. 1, it became possible to efficiently separate the iron content and the chromium content of the dust generated during the melting of the chromium-containing steel. On the other hand, processing No. In No. 2, the dust collected by the wet dust collector was dehydrated and then aged, and then dry magnetic separation was performed. Therefore, the dust particle size during the magnetic separation process was coarsened, and iron and iron by the magnetic separation process were used. The separation of chromium was not sufficient. In addition, processing No. When the dust after aging was pulverized and subjected to the magnetic separation treatment as in No. 3, the separation behavior of iron and chromium was good, but the pulverization treatment increased the processing cost.
（実施例２）
２００ｔ転炉に溶銑を１５０ｔ装入し、底吹き攪拌とともに上吹きランスからＯ２ガスを供給して溶融還元吹錬を実施した。処理Ｎｏ．４では、その際にクロム源として、処理Ｎｏ．１にて非磁着物として回収し、Ｃｒが濃縮したダストを１００ｔ添加した。また、比較のために、処理Ｎｏ．５では、同様の溶融還元吹錬にて、磁選処理前のダストを１００ｔ添加した。その結果を表３に示す。
(Example 2)
150 tons of hot metal was charged into a 200 ton converter, and O 2 gas was supplied from the top blown lance together with bottom blowing stirring to carry out melt reduction blowing. Processing No. In No. 4, the processing No. 4 was used as a chromium source at that time. It was recovered as a non-magnetic material in No. 1, and 100 tons of Cr-concentrated dust was added. In addition, for comparison, processing No. In No. 5, 100 tons of dust before the magnetic separation treatment was added by the same melt-reduction blowing. The results are shown in Table 3.
処理Ｎｏ．４は、処理Ｎｏ．１によって、クロム濃度を高めたダストを使用したことで、処理Ｎｏ．５と比較して、同じ量のダストを使用しても、溶鉄中Ｃｒ濃度を高めることができた。結果として、クロム含有鋼の合金コストを低減できた。 Processing No. No. 4 is the processing No. By using dust having a high chromium concentration in No. 1, the treatment No. 1 was used. Even if the same amount of dust was used as compared with No. 5, the Cr concentration in the molten iron could be increased. As a result, the alloy cost of the chromium-containing steel could be reduced.
（実施例３）
処理Ｎｏ．６では、焼結原料として、処理Ｎｏ．１にて磁着物として回収した、鉄分の多いダストを鉄分として０．５～２％の配合割合で使用した。処理Ｎｏ．７では、比較のため、焼結原料として、磁選処理前のダストを鉄分として０．５～２％の配合割合で用いた。これらのダストを原料にして製造した焼結鉱を高炉に投入して、一定期間操業し、溶銑を製造した。その結果を表４に示す。
(Example 3)
Processing No. In No. 6, the processing No. 6 was used as the sintering raw material. The iron-rich dust recovered as a magnetic material in 1 was used as an iron content in a blending ratio of 0.5 to 2%. Processing No. In No. 7, for comparison, dust before the magnetic separation treatment was used as an iron content in a blending ratio of 0.5 to 2% as a sintering raw material. Sintered ore produced from these dusts was put into a blast furnace and operated for a certain period of time to produce hot metal. The results are shown in Table 4.
処理Ｎｏ．６と７とを比較し、クロム含有ダストのうち、本発明を適用し、鉄分濃度を増加させたダストを焼結鉱の原料として用いることで、磁選処理前のクロム含有ダストをそのまま焼結鉱の原料として用いるより、出銑時のＣｒ濃度を低位に維持することが可能となった。 Processing No. By comparing 6 and 7, and applying the present invention among the chromium-containing dust and using the dust with increased iron concentration as the raw material for the sinter, the chromium-containing dust before the magnetic separation treatment can be used as it is for the sinter. It has become possible to maintain a low Cr concentration at the time of ironing by using it as a raw material.
本発明によれば、集塵水中のクロム含有ダストをそのまま磁選して、分離したので簡便にクロム源と鉄源に分離でき、製鉄原料としてリサイクル活用することが可能となる。
According to the present invention, since the chromium-containing dust in the dust collecting water is magnetically separated as it is and separated, it can be easily separated into a chromium source and an iron source, and can be recycled and utilized as an iron-making raw material.
Claims (4)
前記排気中のクロム含有ダストを湿式で回収する湿式集塵工程と、
該湿式集塵工程で発生した集塵水中のクロム含有ダストを水中で磁力により回収磁着物と回収非磁着物とに選別する水中磁選工程と、
該水中磁選工程で選別された前記回収磁着物を含水ダストとして回収する磁着物回収工程と、
前記水中磁選工程で選別された前記回収非磁着物を含水ケーキとして回収する非磁着物回収工程と、を有することを特徴とするクロム含有ダストの回収方法。 A method for recovering chromium-containing dust in exhaust gas generated in the chromium-containing molten iron refining process.
The wet dust collection step of wetly recovering the chromium-containing dust in the exhaust gas,
An underwater magnetic separation step of sorting chromium-containing dust in the dust collecting water generated in the wet dust collecting step into a recovered magnetic deposit and a recovered non-magnetic deposit by magnetic force in the water.
A magnetic material recovery step of recovering the recovered magnetic material selected in the underwater magnetic separation step as water-containing dust, and a magnetic material recovery step.
A method for recovering chromium-containing dust, which comprises a non-magnetic material recovery step of recovering the recovered non-magnetic material selected in the underwater magnetic separation step as a water-containing cake.
相対的にクロム濃度の低い他方を製精錬工程用の鉄源として、
決定することを特徴とする請求項２に記載の製鉄原料の製造方法。 One with a relatively high chromium concentration is used as a chromium source for the refining process of chromium-containing steel.
The other, which has a relatively low chromium concentration, is used as an iron source for the refining process.
The method for producing an iron-making raw material according to claim 2, wherein the method is determined.
前記排気中のクロム含有ダストを湿式で回収する湿式集塵装置と、
前記湿式集塵装置で発生した集塵水中のクロム含有ダストを水中で磁力により回収磁着物と回収非磁着物に選別する水中磁選装置と、
前記水中磁選装置で選別された前記回収磁着物を含水ダストとして回収する磁着物回収装置と、
前記水中磁選装置で選別された前記回収非磁着物を含水ケーキとして回収する非磁着物回収装置と、を備えることを特徴とするクロム含有ダストの回収設備。 A facility for recovering chromium-containing dust in exhaust gas generated in the chromium-containing molten iron refining process.
A wet dust collector that wetly recovers chromium-containing dust in the exhaust gas,
An underwater magnetic separator that sorts chromium-containing dust in dust-collecting water generated by the wet dust collector into recovered magnetic deposits and recovered non-magnetic deposits by magnetic force in the water.
A magnetic material recovery device that recovers the recovered magnetic material selected by the underwater magnetic separator as water-containing dust, and a magnetic material recovery device.
A device for recovering chromium-containing dust, comprising: a non-magnetic material recovery device for recovering the recovered non-magnetic material selected by the underwater magnetic separator as a water-containing cake.
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| JPS63307117A (en) * | 1987-06-08 | 1988-12-14 | Sumitomo Metal Ind Ltd | Production of zinc carbonate |
| JP2003301212A (en) * | 2002-04-09 | 2003-10-24 | Nippon Steel Corp | Method for refining stainless steel, and dust sorting recovery apparatus |
| JP2009006273A (en) * | 2007-06-28 | 2009-01-15 | Jfe Steel Kk | Wet type magnetic separation method for separating mixture of microparticles |
| JP2011038129A (en) * | 2009-08-06 | 2011-02-24 | Hamada Heavy Industries Ltd | Method for reutilizing product in iron-manufacturing process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63307117A (en) * | 1987-06-08 | 1988-12-14 | Sumitomo Metal Ind Ltd | Production of zinc carbonate |
| JP2003301212A (en) * | 2002-04-09 | 2003-10-24 | Nippon Steel Corp | Method for refining stainless steel, and dust sorting recovery apparatus |
| JP2009006273A (en) * | 2007-06-28 | 2009-01-15 | Jfe Steel Kk | Wet type magnetic separation method for separating mixture of microparticles |
| JP2011038129A (en) * | 2009-08-06 | 2011-02-24 | Hamada Heavy Industries Ltd | Method for reutilizing product in iron-manufacturing process |
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