JP2008212809A - Centrifugal separation method for iron making dust-containing slurry - Google Patents
Centrifugal separation method for iron making dust-containing slurry Download PDFInfo
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- JP2008212809A JP2008212809A JP2007052975A JP2007052975A JP2008212809A JP 2008212809 A JP2008212809 A JP 2008212809A JP 2007052975 A JP2007052975 A JP 2007052975A JP 2007052975 A JP2007052975 A JP 2007052975A JP 2008212809 A JP2008212809 A JP 2008212809A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 239000002002 slurry Substances 0.000 title claims abstract description 55
- 239000000428 dust Substances 0.000 title claims abstract description 46
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 27
- 238000000926 separation method Methods 0.000 title claims abstract description 19
- 239000011701 zinc Substances 0.000 claims abstract description 40
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 40
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims description 11
- 238000004062 sedimentation Methods 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 24
- 239000007787 solid Substances 0.000 description 21
- 239000007788 liquid Substances 0.000 description 18
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 14
- 230000005484 gravity Effects 0.000 description 8
- 238000011084 recovery Methods 0.000 description 8
- 239000011787 zinc oxide Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005119 centrifugation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000012527 feed solution Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
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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、製鉄ダストを含んだスラリーを遠心分離する製鉄ダスト含有スラリーの遠心分離方法に係り、特に亜鉛の分離効率の高い製鉄ダスト含有スラリーの遠心分離方法に関する。 The present invention relates to a method for centrifuging an iron-making dust-containing slurry for centrifuging a slurry containing iron-making dust, and more particularly to a method for centrifuging an iron-making dust-containing slurry with high zinc separation efficiency.
高炉排ガスや転炉排ガスを湿式集塵したスラリーなどの製鉄ダスト含有スラリーには鉄だけでなく亜鉛が含まれている。この亜鉛を遠心分離により回収することが特開２００４−１０５８０１号に記載されている。
製鉄ダスト含有スラリーに含まれる鉄分は、有価分として製鉄工程に再利用することが望ましい。一方、同時に含有される亜鉛は、高炉内張りレンガの損傷の原因になるとともに炉壁付着物の生成を助長するため、原料として不適当である。 It is desirable to reuse the iron contained in the iron-making dust-containing slurry as a valuable component in the iron-making process. On the other hand, the zinc contained at the same time is not suitable as a raw material because it causes damage to the blast furnace lining bricks and promotes the formation of furnace wall deposits.
そこで本発明は、製鉄ダスト含有スラリー中の鉄と亜鉛とを効率よく分離することができる製鉄ダスト含有スラリーの遠心分離方法を提供することを目的とするものである。 Then, an object of this invention is to provide the centrifugation method of the iron-making dust containing slurry which can isolate | separate iron and zinc in an iron-making dust containing slurry efficiently.
本発明の製鉄ダスト含有スラリーの遠心分離方法は、亜鉛と鉄とを含んだ製鉄ダストのスラリーを遠心分離機で遠心分離する製鉄ダストの遠心分離方法において、遠心分離機の遠心力を８０〜１５０Ｇとすることを特徴とするものである。遠心分離機に供給するスラリーの濃度を３〜１８重量％とし、遠心分離機の遠心沈降面積（以下、これを「Σ」という。）あたりのスラリーの供給量を２００×１０−４〜４００×１０−４Ｌ／ｃｍ２ｈｒとすることが好ましい。また、採用する遠心分離機としては、デカンタ型遠心分離機が好ましい。 The method for centrifuging iron-containing dust-containing slurry according to the present invention is a method for centrifuging iron-making dust in which a slurry of iron-making dust containing zinc and iron is centrifuged with a centrifuge. It is characterized by that. The concentration of the slurry supplied to the centrifuge is 3 to 18% by weight, and the amount of slurry supplied per centrifuge sedimentation area (hereinafter referred to as “Σ”) is 200 × 10 −4 to 400 ×. It is preferable to set it as 10 <-4 > L / cm < 2 > hr. Moreover, as a centrifuge to employ | adopt, a decanter type centrifuge is preferable.
なお、Σは、遠心沈降機のスケールアップに用いる面積の単位をもつ値であって、重力沈降を仮定した場合に必要な沈降面積に相当する。一般に下記算出式で算出できる。 Note that Σ is a value having a unit of area used for the scale-up of the centrifugal sedimentator, and corresponds to a sedimentation area required when gravity sedimentation is assumed. Generally, it can be calculated by the following calculation formula.
Σ＝２πω２Ｌｅ（３／４Ｒ２＋１／４ｒ２）／ｇ
上記式において、πは円周率、ωは回転角速度、Ｌｅはフィードポイントからフロントハブまでの距離（スラリー入口から分離液出口までの距離）、Ｒは遠心分離機の回転筒内径、ｒは回転軸から液面までの距離、ｇは重力の加速度を表わす。
Σ = 2πω 2 Le (3 / 4R 2 + 1 / 4r 2 ) / g
In the above equation, π is the circular ratio, ω is the rotational angular velocity, Le is the distance from the feed point to the front hub (distance from the slurry inlet to the separation liquid outlet), R is the inner diameter of the rotating cylinder of the centrifuge, and r is the rotation The distance from the axis to the liquid level, g, represents the acceleration of gravity.
本発明によると、酸化鉄と酸化亜鉛を両者の粒径差に基づいて効率よく遠心分離することができる。特に、デカンタ型遠心分離機を用いることにより、効率よく遠心分離することができる。 According to the present invention, iron oxide and zinc oxide can be efficiently centrifuged based on the particle size difference between the two. In particular, it can be efficiently centrifuged by using a decanter type centrifuge.
以下、本発明について詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明で遠心分離の処理対象とするスラリーは、亜鉛と鉄とを含んだ製鉄ダストのスラリーである。この製鉄ダストは、製鉄所において発生するダストであり、特に高炉において発生するダスト及び製鋼工程で発生するダストである。 The slurry to be centrifuged in the present invention is an iron-making dust slurry containing zinc and iron. This iron-making dust is dust generated in an ironworks, particularly dust generated in a blast furnace and dust generated in a steelmaking process.
通常、この製鉄ダストはベンチュリースクラバなどの湿式集塵装置で捕集され、シックナーで濃縮され、さらにフィルタープレスで脱水され、回収工程に送られている。本発明では、上記の湿式集塵工程からのダスト含有スラリーを主たる処理対象スラリーとする。 Usually, the iron dust is collected by a wet dust collector such as a venturi scrubber, concentrated by a thickener, dehydrated by a filter press, and sent to a recovery process. In this invention, let the dust containing slurry from said wet dust collection process be a main process target slurry.
通常、これらのスラリー中のダストは鉄（金属鉄及び酸化鉄）を多量に含有すると共に、さらに亜鉛（金属亜鉛及び酸化亜鉛）も相当量含有している。なお、高炉ダストの場合、炭素も多量に含有されている。 Usually, the dust in these slurries contains a large amount of iron (metallic iron and iron oxide), and also contains a considerable amount of zinc (metallic zinc and zinc oxide). In the case of blast furnace dust, carbon is also contained in a large amount.
高炉ダストは、通常の場合、酸化鉄（Ｆｅ２Ｏ３とＦｅＯの合量）３０〜５０重量％、、酸化亜鉛１〜５重量％、炭素３０〜５５重量％を含んでいる。 The blast furnace dust usually contains 30 to 50% by weight of iron oxide (total amount of Fe 2 O 3 and FeO), 1 to 5% by weight of zinc oxide, and 30 to 55% by weight of carbon.
この高炉ダスト中の酸化鉄の粒径は１〜１００μｍ、酸化亜鉛の粒径は１０μｍ以下であり、細粒ダストに亜鉛が多く含まれていることが分かっている。 The particle size of iron oxide in the blast furnace dust is 1 to 100 μm, the particle size of zinc oxide is 10 μm or less, and it is known that the fine particle dust contains a large amount of zinc.
転炉ダストは、通常の場合、酸化鉄（Ｆｅ２Ｏ３とＦｅＯの合量）６０〜７０重量％、酸化亜鉛０．２〜０．５重量％、炭素１〜２重量％を含んでいる。 Converter dust usually contains 60 to 70% by weight of iron oxide (total amount of Fe 2 O 3 and FeO), 0.2 to 0.5% by weight of zinc oxide, and 1 to 2% by weight of carbon. .
湿式集塵装置から取り出されるこれらの製鉄ダストのスラリー濃度は、通常１〜５重量％程度である。 The slurry concentration of these iron making dusts taken out from the wet dust collector is usually about 1 to 5% by weight.
本発明では、このようなスラリーをシックナーで沈澱濃縮し、工水等でスラリー濃度を希釈調整後、遠心分離機で遠心分離する。用いる遠心分離機としては、湿式サイクロンよりデカンタ型遠心分離機が好適である。周知の通り、湿式サイクロンは液体自身に流速を付与して遠心力を確保するため、比重，粘性などスラリー性状の変動が分離効率に大きく影響するためである。一方、デカンタ型遠心分離機は、原液スラリーを高速回転する回転ボウル内に導入して、遠心効果により比重の重い固形物（ケーキ）を、回転ボウル内壁へ沈降分離し、同時に回転ボウルと若干の差速を有して回転するスクリュウコンベヤによって、沈降固形物を傾斜部（ビーチゾーン）側に移送し、さらに固形物をこのビーチゾーンをスクリュウコンベヤにて掻揚して脱液し、回転ボウルに設けられるケーキ排出口から機外に排出するよう構成されている。 In the present invention, such a slurry is concentrated by precipitation with a thickener, the slurry concentration is adjusted by dilution with industrial water or the like, and then centrifuged with a centrifuge. As the centrifuge to be used, a decanter type centrifuge is preferable to a wet cyclone. As is well known, the wet cyclone secures centrifugal force by applying a flow rate to the liquid itself, so that fluctuations in slurry properties such as specific gravity and viscosity greatly affect the separation efficiency. On the other hand, the decanter type centrifuge introduces the stock solution slurry into a rotating bowl that rotates at high speed, and separates and solidifies a heavy solid (cake) with a centrifugal effect on the inner wall of the rotating bowl by the centrifugal effect. The settling solids are transferred to the inclined part (beach zone) side by a screw conveyor that rotates with a differential speed, and the solids are decanted by the screw conveyor and drained into a rotating bowl. It is comprised so that it may discharge | emit out of the machine from the cake discharge port provided.
本発明では、この遠心分離機に製鉄ダスト含有スラリーを供給して遠心力を８０〜１５０Ｇ、好ましくは１００〜１５０Ｇで遠心分離を行う。遠心分離機に供給する製鉄ダスト含有スラリーの濃度は３〜１８重量％、好ましくは５〜１０重量％とし、遠心分離機の遠心沈降面積あたりのスラリー供給量を２００×１０−４〜４００×１０−４Ｌ／ｃｍ２ｈｒとすることが好ましい。 In the present invention, the iron-containing dust-containing slurry is supplied to the centrifugal separator, and centrifugal separation is performed at a centrifugal force of 80 to 150G, preferably 100 to 150G. The concentration of the iron-containing dust-containing slurry supplied to the centrifuge is 3 to 18% by weight, preferably 5 to 10% by weight, and the slurry supply amount per centrifugal sedimentation area of the centrifuge is 200 × 10 −4 to 400 × 10 6. -4 L / cm 2 hr is preferable.
遠心分離機の遠心力が８０Ｇよりも低いと、高比重固形物（粗粒ダスト）の分離が不十分であり、鉄及び亜鉛等の固形物の分離効率が低下する。また、８０Ｇ以下では安定運転ができない。一方、１５０Ｇよりも高い場合には亜鉛が多く含まれる低比重固形物（細粒ダスト）も選鉱液から分離され、高比重固形物（粗粒ダスト）とともに回収されるため分離効率が悪くなる。また、遠心分離機に供給するスラリー濃度が３重量％よりも低いと、固液分離が促進されるため処理効率が悪く、１８重量％よりも高いと、高比重固形物（粗粒ダスト）の分離が不十分となり、鉄と亜鉛との分離効率が悪くなる。更に、遠心分離機の遠心沈降面積あたりのスラリー供給量が２００×１０−４Ｌ／ｃｍ２ｈｒよりも小さいと鉄と亜鉛との分離効率が悪くなり、４００×１０−４Ｌ／ｃｍ２ｈｒよりも大きいと、機械的負荷が高くなりすぎて連続運転ができない可能性がある。 When the centrifugal force of the centrifuge is lower than 80G, the separation of high specific gravity solids (coarse dust) is insufficient, and the separation efficiency of solids such as iron and zinc is lowered. Moreover, stable operation is not possible below 80G. On the other hand, when it is higher than 150G, the low specific gravity solid (fine dust) containing a large amount of zinc is also separated from the beneficiation liquid and recovered together with the high specific gravity solid (coarse dust), resulting in poor separation efficiency. Also, if the slurry concentration supplied to the centrifuge is lower than 3% by weight, the solid-liquid separation is promoted, so that the processing efficiency is poor. If it is higher than 18% by weight, the high specific gravity solids (coarse dust) Separation becomes insufficient, and the separation efficiency between iron and zinc deteriorates. Furthermore, when the slurry supply amount per centrifugal sedimentation area of the centrifuge is smaller than 200 × 10 −4 L / cm 2 hr, the separation efficiency between iron and zinc is deteriorated, and 400 × 10 −4 L / cm 2 hr. If it is larger than that, the mechanical load becomes too high, and continuous operation may not be possible.
〔実験例〕高炉ダストとして、組成が酸化鉄（Ｆｅ２Ｏ３とＦｅＯの合量）３２〜３８重量％、酸化亜鉛１．４〜３．８重量％、炭素３２〜４１重量％のダストを含んだスラリーを遠心分離機で処理した。遠心分離機の回転数、スラリー濃度、スラリー供給量を種々変えて分離効率を測定した。用いた遠心分離機は巴工業株式会社製のデカンタ型遠心分離機ＰＴＭ００６である。スラリーについてはタンク中で所定濃度となるように水を添加し、十分に攪拌したものをポンプによって遠心分離機に供給した。 [Experimental example] As blast furnace dust, dust having a composition of iron oxide (total amount of Fe 2 O 3 and FeO) of 32 to 38% by weight, zinc oxide of 1.4 to 3.8% by weight, and carbon of 32 to 41% by weight The contained slurry was processed in a centrifuge. Separation efficiency was measured by changing the number of rotations of the centrifuge, slurry concentration, and slurry supply amount. The centrifuge used was a decanter centrifuge PTM006 manufactured by Sakai Kogyo Co., Ltd. As for the slurry, water was added so as to have a predetermined concentration in the tank, and the mixture was sufficiently stirred and supplied to the centrifuge by a pump.
（１） 遠心力と亜鉛除去率の関係を求める試験
スラリー濃度が3〜９重量％のスラリーを７００L／ｈｒ又は９００L／ｈｒで供給し、遠心力を１００G,１５０G又は２００Gとして遠心分離を行い、亜鉛除去率を測定した。遠心力１００G、供給量７００L／ｈｒのときΣあたりの供給量は１８９×１０-4／ｃｍ２ｈｒ、遠心力１００G、供給量９００L／ｈｒのときΣあたりの供給量は２４３×１０-4／ｃｍ２ｈｒとなる。なお、Σ値は遠心力に比例する。
(1) Test for determining the relationship between centrifugal force and zinc removal rate A slurry having a slurry concentration of 3 to 9% by weight is supplied at 700 L / hr or 900 L / hr, and centrifuged at 100 G, 150 G, or 200 G, and centrifuged. The zinc removal rate was measured. When the centrifugal force is 100 G and the supply amount is 700 L / hr, the supply amount per Σ is 189 × 10 −4 / cm 2 hr, when the centrifugal force is 100 G and the supply amount is 900 L / hr, the supply amount per Σ is 243 × 10 −4 / cm 2 hr. The Σ value is proportional to the centrifugal force.
なお、亜鉛除去率は、供給するスラリー中の全亜鉛の量と、固形物として回収したケーキ中の全亜鉛の量から計算される。 The zinc removal rate is calculated from the amount of total zinc in the supplied slurry and the amount of total zinc in the cake recovered as a solid.
結果を第１図に示す。第１図の通り、遠心力を高くすると亜鉛除去率は低下する。これは、遠心力が高くなると、ダストの沈降量が増え、ケーキ中に取り込まれる亜鉛量が増加するためである。第１図より、遠心力は１５０Ｇ以下が好ましいことが認められる。 The results are shown in FIG. As shown in FIG. 1, when the centrifugal force is increased, the zinc removal rate decreases. This is because as the centrifugal force increases, the amount of dust settling increases and the amount of zinc taken into the cake increases. From FIG. 1, it is recognized that the centrifugal force is preferably 150 G or less.
（２） 供給量とケーキの固形物濃度との関係を求める試験
スラリーとして、濃度３．０重量％、４．１重量％、４．７重量％、７．０重量％、１０．５重量％、１２．５重量％、の６種類のものを用いた。各スラリーの供給量を５００〜１５００Ｌ／ｈｒの範囲（Σあたりの供給量で１３５×１０−４Ｌ／ｃｍ２ｈｒ〜４０５×１０−４Ｌ／ｃｍ２ｈｒ）で変化させ、ケーキの固形物濃度を測定した。結果を第２図に示す。
(2) Test for determining the relationship between the amount supplied and the solid content of the cake As a slurry, the concentration was 3.0 wt%, 4.1 wt%, 4.7 wt%, 7.0 wt%, 10.5 wt% Six types of 12.5% by weight were used. The supply amount of the slurry varied from 500~1500L / hr (135 × 10 -4 L /
第２図の通り、供給量を多くするとケーキの固形物濃度が上昇する。これは、供給量を多くすると、液の機内滞留時間が短くなり、粒径の小さい炭素分が沈降しにくくなり、ケーキ中の鉄などの高比重分の割合が相対的に増大するためである。第２図より、供給量はΣあたりの供給量で２００×１０−４Ｌ／ｃｍ２ｈｒ以上（流量としては、７４０Ｌ／ｈｒ以上）が好ましいことが認められる。 As shown in FIG. 2, increasing the supply amount increases the cake solids concentration. This is because when the supply amount is increased, the residence time of the liquid in the machine is shortened, and the carbon component having a small particle size is difficult to settle, and the ratio of high specific gravity such as iron in the cake is relatively increased. . From FIG. 2, it is recognized that the supply amount per Σ is preferably 200 × 10 −4 L / cm 2 hr or more (the flow rate is 740 L / hr or more).
（３） 供給量と固形物（ＳＳ）回収率の関係
上記（２）の試験において、測定した各供給液条件における供給量と固形物回収率の関係を第３図に示す。いずれの供給液条件でも供給量を多くすると固形物回収率は低下している。これは、供給量を多くすると液の機内での滞留時間が短くなり、固形物が沈降せずに分離液側に流出するためである。第３図より、固形物回収率７０％以上を得るためには、供給量はΣあたりの供給量で４００×１０−４Ｌ／ｃｍ２ｈｒ以下（流量として約１５００Ｌ／ｈｒ以下）が好ましいことが認められる。
(3) Relationship between supply amount and solid matter (SS) recovery rate FIG. 3 shows the relationship between the supply amount and the solid matter recovery rate in each of the supply liquid conditions measured in the test of (2) above. Under any supply liquid condition, the solids recovery rate decreases when the supply amount is increased. This is because when the supply amount is increased, the residence time of the liquid in the machine is shortened, and the solid matter flows out to the separation liquid side without being settled. From FIG. 3, in order to obtain a solids recovery rate of 70% or more, the supply amount is preferably 400 × 10 −4 L / cm 2 hr or less (approx. 1500 L / hr or less as a flow rate) per Σ. Is recognized.
（４） 供給量と亜鉛除去率の関係
スラリーとして、濃度３．０重量％、４．１重量％、４．７重量％、７．０重量％、１０．５重量％、１２．５重量％、の６種類のものを用いた上記（２）の試験において、各供給液条件における供給量と亜鉛除去率の関係を第４図に示す。いずれの供給条件でも供給量を多くすると亜鉛除去率は上昇傾向を示す。これは、供給量を多くすると液の滞留時間が短くなるために、亜鉛分が沈降せずに分離液側に流出するためである。供給量がΣあたりの供給量で２００×１０−４Ｌ／ｃｍ２ｈｒ以上で全ての供給液条件で亜鉛除去率は８０％以上となった。第４図より、供給量はΣあたりの供給量で２６０×１０−４Ｌ／ｃｍ２ｈｒ以上がさらに好ましいことが認められる。
(4) Relation between supply amount and zinc removal rate As slurry, the concentration is 3.0 wt%, 4.1 wt%, 4.7 wt%, 7.0 wt%, 10.5 wt%, 12.5 wt% FIG. 4 shows the relationship between the supply amount and the zinc removal rate under each supply liquid condition in the test (2) using the above six types. When the supply amount is increased under any supply condition, the zinc removal rate tends to increase. This is because when the supply amount is increased, the residence time of the liquid is shortened, so that the zinc content does not settle and flows out to the separation liquid side. When the supply amount was 200 × 10 −4 L / cm 2 hr or more in terms of the supply amount per Σ, the zinc removal rate was 80% or more under all supply liquid conditions. From FIG. 4, it is recognized that the supply amount per Σ is more preferably 260 × 10 −4 L / cm 2 hr or more.
（５） 供給液濃度と亜鉛除去率の関係
上記（２）に示した各スラリーをΣあたりの供給量で２００×１０−４Ｌ／ｃｍ２ｈｒ以上としたとき供給液濃度と亜鉛除去率の関係を第５図に示す。第５図の通り、供給液濃度を高くすると亜鉛除去率は低下傾向を示す。これは、濃度が高いと供給液の固形物の分散が不十分となり、亜鉛分が鉄分と共に沈降するためであると考えられる。
第５図より、７５％以上の亜鉛除去率を得るためには、スラリー濃度１８重量％以下が好ましいことが認められる。
(5) Relationship between supply liquid concentration and zinc removal rate When each slurry shown in (2) above is 200 × 10 −4 L / cm 2 hr or more in terms of supply amount per Σ, The relationship is shown in FIG. As shown in FIG. 5, when the supply liquid concentration is increased, the zinc removal rate tends to decrease. This is considered to be because when the concentration is high, the solids in the feed liquid are not sufficiently dispersed and the zinc content settles together with the iron content.
From FIG. 5, it is recognized that a slurry concentration of 18% by weight or less is preferable in order to obtain a zinc removal rate of 75% or more.
（６） 実験例のまとめ
(i) 遠心力は低い方が亜鉛除去率は高くなる。最も適正な遠心力は約１００Ｇである。
(ii) 供給量を多くするとケーキの固形物濃度、亜鉛除去率は共に上昇傾向を示し、ＳＳ回収率は低下傾向を示す。
(iii) 供給液濃度を高くすると亜鉛除去率は低下傾向を示す。
(6) Summary of experimental examples
(i) The lower the centrifugal force, the higher the zinc removal rate. The most appropriate centrifugal force is about 100G.
(ii) When the supply amount is increased, both the solids concentration of the cake and the zinc removal rate show an upward trend, and the SS recovery rate shows a downward trend.
(iii) When the feed solution concentration is increased, the zinc removal rate tends to decrease.
〔実施例〕
高炉ダストとして、組成が酸化鉄（Ｆｅ２Ｏ３とＦｅＯの合量）３１〜３８重量％、酸化亜鉛２．７〜４重量％、炭素３７〜４４重量％のダストを含んだスラリーを遠心分離機（巴工業株式会社製のデカンタ型遠心分離機ＰＴＭ４７０）で処理した。
〔Example〕
As a blast furnace dust, a slurry containing iron oxide (total amount of Fe 2 O 3 and FeO) of 31 to 38% by weight, zinc oxide of 2.7 to 4% by weight and carbon of 37 to 44% by weight is centrifuged. (A decanter type centrifuge PTM470 manufactured by Sakai Kogyo Co., Ltd.).
処理条件は次のとおり。
遠心力：１００Ｇ（ω：５９０ｒｐｍ）
スラリー濃度：７〜１８
Σあたりの供給量：２００×１０−４Ｌ／ｃｍ２ｈｒ〜２４０×１０−４Ｌ／ｃｍ２ｈ
ｒ（１６．７〜２０ｍ３／ｈｒ）
処理の結果、酸化鉄の回収率は１００％であり、亜鉛除去率は８４．５％であった。
The processing conditions are as follows.
Centrifugal force: 100G (ω: 590rpm)
Slurry concentration: 7-18
Supply amount per Σ: 200 × 10 −4 L / cm 2 hr to 240 × 10 −4 L / cm 2 h
r (16.7-20m 3 / hr)
As a result of the treatment, the iron oxide recovery rate was 100% and the zinc removal rate was 84.5%.
Claims (3)
遠心分離機の遠心力を８０〜１５０Ｇとすることを特徴とする製鉄ダスト含有スラリーの遠心分離方法。 In the method of centrifugal separation of steelmaking dust, the slurry of ironmaking dust containing zinc and iron is centrifuged with a centrifuge.
A method for centrifuging iron-containing dust-containing slurry, wherein the centrifugal force of the centrifuge is 80 to 150 G.
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| JP2012528885A (en) * | 2009-06-04 | 2012-11-15 | ゲノマチカ， インク． | Method for separating components of fermentation broth |
| WO2015105472A1 (en) * | 2014-01-09 | 2015-07-16 | Олег Игореви НОСОВСКИЙ | Method for comprehensive treatment of slurries from metallurgical and mining-enrichment enterprises |
| RU2566706C2 (en) * | 2014-03-17 | 2015-10-27 | Олег Игоревич Носовский | Complex processing of metallurgical and mining slimes |
| JP2021115511A (en) * | 2020-01-24 | 2021-08-10 | 中部リサイクル株式会社 | Method for producing zinc-containing solid matter from molten fly ash |
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| JP7208179B2 (en) | 2020-01-24 | 2023-01-18 | 中部リサイクル株式会社 | Method for producing zinc-containing solids from molten fly ash |
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