JP4715022B2 - Method for producing zinc oxide sinter or zinc oxide briquette - Google Patents
Method for producing zinc oxide sinter or zinc oxide briquette Download PDFInfo
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- JP4715022B2 JP4715022B2 JP2001136340A JP2001136340A JP4715022B2 JP 4715022 B2 JP4715022 B2 JP 4715022B2 JP 2001136340 A JP2001136340 A JP 2001136340A JP 2001136340 A JP2001136340 A JP 2001136340A JP 4715022 B2 JP4715022 B2 JP 4715022B2
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- zinc oxide
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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
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Description
【０００１】
【発明の属する技術分野】
本発明は、酸化亜鉛焼鉱または酸化亜鉛団鉱の製造方法に関し、特に、鉄鋼業の高炉、電気炉等で発生する鉄鋼ダストから回収される粗酸化亜鉛から、酸化亜鉛焼鉱または酸化亜鉛団鉱を製造する方法において、フッ素成分を効果的に除去する方法に関する。
【０００２】
【従来の技術】
鉄鋼業における高炉や電気炉から発生する鉄鋼ダスト等から回収された粗酸化亜鉛等には、その主成分である酸化亜鉛や酸化鉛以外に、塩素およびフッ素等のハロゲン成分が相当量含有されており、従来からこの粗酸化亜鉛中におけるハロゲン成分を除去し、低ハロゲン含有率の酸化亜鉛焼鉱または酸化亜鉛団鉱を製造している。
【０００３】
図２に、従来の粗酸化亜鉛処理工程のフローチャートを示す。
【０００４】
この酸化亜鉛焼鉱または酸化亜鉛団鉱の製造方法において、粗酸化亜鉛に湿式処理を施すことでハロゲン化物を除去して、乾燥加熱炉にて焼成および造粒を行う。
【０００５】
鉄鋼ダスト等から回収される粗酸化亜鉛中には、８〜１８質量％程度の塩素および０〜５質量％程度のフッ素等のハロゲンを、塩素化合物またはフッ素化合物等のハロゲン化物として含有している。従って、これらのハロゲン化物やその他の不純物は、ＮａＣＯ3、Ｎａ（ＯＨ）2あるいはその他の薬剤を用いる湿式処理を施すことで除去する。
【０００６】
粗酸化亜鉛に湿式処理を施すことにより除去されたハロゲン化物は、工程液中に濃縮されており、工程液中には粗酸化亜鉛から極微量溶出した亜鉛および／または鉛成分も含有している。この亜鉛および／または鉛成分を、工程液から回収する方法として、消石灰を用いて工程液のｐＨを調整することにより、亜鉛化合物あるいは鉛化合物として析出させる中和処理方法がある。
【０００７】
この中和処理方法で回収された亜鉛化合物あるいは鉛化合物を含有する中和処理澱物は、粗酸化亜鉛に湿式処理を施して得られる酸化亜鉛スラリーと共に、乾燥加熱炉にて焼成および造粒を行い、酸化亜鉛焼鉱または酸化亜鉛団鉱に固定させる方法が一般的に行われている。
【０００８】
しかし、中和処理方法においては、工程液中のフッ素成分も、ＣａＦ2あるいはその他のカルシウム／フッ素化合物を形成し析出し、中和澱物中に含有され回収される。従って、酸化亜鉛焼鉱または酸化亜鉛団鉱のフッ素含有率が上昇する問題がある。
【０００９】
【発明が解決しようとする課題】
本発明の方法は、フッ素含有率の低い酸化亜鉛焼鉱または酸化亜鉛団鉱の製造方法を提供することを目的とする。
【００１０】
【課題を解決するための手段】
上記課題を解決するために、本発明の酸化亜鉛焼鉱または酸化亜鉛団鉱の製造方法は、焼成・造粒工程の前処理として、粗酸化亜鉛を還元炉に石灰石および還元剤と共に装入することにより、フッ素成分を還元物残渣または還元スラグ内に固定する。
【００１１】
【発明の実施の形態】
本発明の実施の形態について以下に、詳述する。
【００１２】
本発明の酸化亜鉛焼鉱または酸化亜鉛団鉱の製造方法は、図１のフローチャートに示すように、以下の各工程からなる。
【００１３】
鉄鋼ダストから回収された粗酸化亜鉛を還元剤とともに還元炉に装入して還元する。
【００１４】
還元炉には、ロータリーキルン等の固気反応を利用した還元焙焼炉、あるいは装入物を溶解させて液気反応を利用した還元溶融炉等が利用できる。
【００１５】
コークス、石炭等の還元剤の装入では、必要に応じて石灰石や硅石等の溶剤や、亜鉛等を含有する鉄鋼ダスト等の原料を同時に装入してもよい。還元剤の配合比率は、還元炉に装入する装入物の５〜３０質量％であり、必要に応じて装入する溶剤は、還元炉に装入する装入物の３０質量％以下である。
【００１６】
また、溶剤として石灰石を用いる場合には、還元炉に装入する前に、粗酸化亜鉛と石灰石とを混合および／または造粒等の前処理を施すこともできる。
【００１７】
還元炉に装入された粗酸化亜鉛は、還元炉内で粗酸化亜鉛中に含有する亜鉛あるいは鉛等の重金属化合物が揮発し、ダストとして回収される。ここで、粗酸化亜鉛中に含有しているフッ素以外のハロゲン成分はダストに混入するが、フッ素成分は、ＣａＦ2あるいはカルシウム／フッ素化合物の形態のものが多く、これらは、還元雰囲気では揮発分解はほとんど生じない性状であり、還元炉から産出される還元物残渣あるいは還元スラグ中に固定される。
【００１８】
溶剤として、石灰石を添加した場合においては、フッ素成分がカルシウム／フッ素化合物の形態でなくても、石灰石とフッ素成分との反応により、カルシウム／フッ素化合物を形成し、還元炉から産出される還元物残渣あるいは還元スラグ中に固定される。
【００１９】
還元炉内で揮発し、回収された亜鉛等の金属化合物は、フッ素成分の低減された粗酸化亜鉛として回収される。
【００２０】
これ以降は、従来方法と同様にして、湿式処理を施すことで塩素成分等の不純物を除去後、乾燥加熱炉にて焼成・造粒を行うことで、低フッ素品位の酸化亜鉛焼鉱または酸化亜鉛団鉱として生産される。
【００２１】
（実施例）
本発明の一実施例について、以下に説明する。
【００２２】
［参考例］
（１）前処理工程
鉄鋼ダストから回収された粗酸化亜鉛を、粉状コークスと共に装入した。
【００２３】
還元炉には、鉄鋼ダストから亜鉛を回収するのに用いられている還元焙焼用の回転炉を用いた。
【００２４】
この際用いた粗酸化亜鉛のＺｎ、Ｐｂ、Ｆ、Ｃｌ成分を表１に示す。
【００２５】
【表１】
該回転炉は、外径３５ｍ、長さ５０ｍであり、排出端側に重油燃焼バーナーを備える。粉状コークスは粗酸化亜鉛に対し、２０質量％程度になるように添加した。還元炉にて重金属化合物等の回収後、産出された還元物残渣中のフッ素品位は、３．５質量％程度であり、還元物残渣へのフッ素固定率は８０％以上であった。
【００２７】
還元物残渣中のＺｎ、Ｐｂ、Ｆ成分品位を表２に示す。
【００２８】
【表２】
還元炉から回収された低フッ素品位の粗酸化亜鉛の主な成分品位を表３に示す。塩素が依然として含まれていることが明らかである。
【００３０】
【表３】
（２）湿式処理工程
還元炉からダストとして回収された粗酸化亜鉛は、フッ素が低減しており、湿式処理を施すことにより、塩素等の不純物を除去した。
【００３２】
（３）第１固液分離工程
該湿式処理工程で得られる酸化亜鉛スラリーを、酸化亜鉛ケーキと分離液に分離する。
【００３３】
（４）中和処理工程
前記分離液に、消石灰を用いて中和処理を行った。
【００３４】
（５）第２固液分離工程
中和処理にて得られた亜鉛および鉛成分を含む中和澱物は、シックナーを用いて固液分離を行った。固液分離後、圧搾型の脱水機を用いて中和澱物ケーキとした。
【００３５】
（６）焼成・造粒工程
第１固液分離工程で得られる酸化亜鉛ケーキに、還元工程で得られるＺｎ・Ｐｂ金属化合物を添加して、乾燥加熱炉にて焼成・造粒を行うことにより、フッ素品位の低い酸化亜鉛焼鉱を得た。
【００３６】
低フッ素品位の粗酸化亜鉛から製造した酸化亜鉛焼鉱の主な成分品位を表４に示す。塩素が低減していることが明らかである。
【００３７】
【表４】
［実施例１］
（１）前処理工程鉄鋼ダストから回収された粗酸化亜鉛を、鉄鋼ダスト、粉状コークス、粉状石灰石と共に装入した。
【００３９】
還元炉には、参考例と同じ還元焙焼用の回転炉を用いた。
【００４０】
この際用いた粗酸化亜鉛の主な成分を表５に示す。
【００４１】
【表５】
この際用いた鉄鋼ダストの主な主成分を表６に示す。
【００４３】
【表６】
粗酸化亜鉛の添加量は鉄鋼ダストに対し、１２質量％程度とし、粉状コークスは鉄鋼ダストと粗酸化亜鉛の統合量に対し、２０質量％程度になるように、粉状石灰石は回転炉装入物の総合品位でＣａＯ／ＳｉＯ2重量比が１．８程度になるように調整し添加した。還元焙焼炉にて重金属化合物等の回収後、産出された還元物残渣中のフッ素品位は、１．６質量％程度であり、還元物残渣中のフッ素固定率は７０％程度であった。
【００４５】
還元物残渣中の主な成分品位を表７に示す。
【００４６】
【表７】
還元炉から回収された低フッ素品位の粗酸化亜鉛の主な成分品位を表８に示す。
【００４８】
【表８】
（２）湿式処理工程
還元炉から回収されたフッ素を低減させた粗酸化亜鉛は、湿式処理を施すことにより、塩素等の不純物を除去した。
【００５０】
（３）第１固液分離工程
該湿式処理工程で得られる酸化亜鉛スラリーを、酸化亜鉛ケーキと分離液に分離する。
【００５１】
（４）中和処理工程
前記分離液に、消石灰を用いて中和処理を行った。
【００５２】
（５）第２固液分離工程
中和処理にて得られた亜鉛および鉛成分を含む中和澱物は、シックナーを用いて固液分離を行った。固液分離後、圧搾型の脱水機を用いて中和澱物ケーキとした。
【００５３】
（６）焼成・造粒工程
第１固液分離工程で得られる酸化亜鉛ケーキに、還元工程で得られる重金属化合物を添加して、乾燥加熱炉にて焼成・造粒を行うことにより、フッ素品位の低い酸化亜鉛焼鉱を得た。
【００５４】
低フッ素品位の粗酸化亜鉛から製造した酸化亜鉛焼鉱の主な成分品位を表９に示す。
【００５５】
【表９】
【発明の効果】
以上、説明した通り、本発明の酸化亜鉛焼鉱または酸化亜鉛団鉱の製造方法により、還元炉から産出される還元物残渣または還元スラグ中にフッ素成分を固定することができ、還元炉にて揮発・回収される粗酸化亜鉛のフッ素を低減することができる。
【００５７】
また、粗酸化亜鉛中のフッ素品位を低減させることで、湿式処理を施して他のハロゲン成分を除去し、乾燥加熱炉から得られる酸化亜鉛焼鉱または酸化亜鉛団鉱のハロゲン品位を低減させることができる。
【図面の簡単な説明】
【図１】 本発明の一実施例を示すフローチャートである。
【図２】 従来の粗酸化亜鉛処理工程を示すフローチャートである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing zinc oxide sinter or zinc oxide ore, and in particular, from zinc oxide recovered from steel dust generated in blast furnaces, electric furnaces, etc. in the steel industry, zinc oxide sinter or zinc oxide group. The present invention relates to a method for effectively removing a fluorine component in a method for producing ore.
[0002]
[Prior art]
Crude zinc oxide recovered from steel dust generated from blast furnaces and electric furnaces in the steel industry contains a substantial amount of halogen components such as chlorine and fluorine in addition to zinc oxide and lead oxide. Conventionally, the halogen component in the crude zinc oxide is removed to produce zinc oxide sinter or zinc oxide briquette with a low halogen content.
[0003]
FIG. 2 shows a flowchart of a conventional crude zinc oxide treatment process.
[0004]
In this method for producing zinc oxide sinter or zinc oxide briquette, the crude zinc oxide is subjected to a wet treatment to remove halides, and then fired and granulated in a dry heating furnace.
[0005]
The crude zinc oxide recovered from steel dust or the like contains about 8 to 18% by mass of chlorine and about 0 to 5% by mass of halogen such as fluorine as chlorine compounds or halides such as fluorine compounds. . Therefore, these halides and other impurities are removed by applying a wet process using NaCO 3 , Na (OH) 2 or other chemicals.
[0006]
The halide removed by wet treatment of the crude zinc oxide is concentrated in the process liquid, and the process liquid also contains zinc and / or lead components that are eluted in a trace amount from the crude zinc oxide. . As a method for recovering the zinc and / or lead component from the process liquid, there is a neutralization treatment method in which the pH of the process liquid is adjusted using slaked lime to precipitate it as a zinc compound or a lead compound.
[0007]
The neutralized starch containing the zinc compound or lead compound recovered by this neutralization method is baked and granulated in a dry heating furnace together with a zinc oxide slurry obtained by subjecting crude zinc oxide to a wet treatment. Generally, a method of performing and fixing to zinc oxide sinter or zinc oxide briquette is performed.
[0008]
However, in the neutralization treatment method, the fluorine component in the process liquid also forms CaF 2 or other calcium / fluorine compounds, precipitates, and is contained and recovered in the neutralized starch. Therefore, there is a problem that the fluorine content of zinc oxide sinter or zinc oxide briquette increases.
[0009]
[Problems to be solved by the invention]
An object of the method of the present invention is to provide a method for producing zinc oxide sinter or zinc oxide briquette having a low fluorine content.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, the method for producing zinc oxide sinter or zinc oxide briquette of the present invention charges crude zinc oxide together with limestone and a reducing agent as a pretreatment for the firing and granulation step. As a result, the fluorine component is fixed in the reduced product residue or reduced slag.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail below.
[0012]
The method for producing zinc oxide sinter or zinc oxide briquette of the present invention includes the following steps as shown in the flowchart of FIG.
[0013]
Crude zinc oxide recovered from steel dust is charged into a reduction furnace together with a reducing agent for reduction.
[0014]
As the reduction furnace, a reduction roasting furnace using a solid-gas reaction such as a rotary kiln, or a reduction melting furnace using a liquid-gas reaction by dissolving a charge can be used.
[0015]
When charging a reducing agent such as coke or coal, a raw material such as a solvent such as limestone or meteorite or steel dust containing zinc or the like may be simultaneously charged as necessary. The mixing ratio of the reducing agent is 5 to 30% by mass of the charge charged in the reduction furnace, and the solvent charged as required is 30% by mass or less of the charge charged in the reduction furnace. is there.
[0016]
Moreover, when using limestone as a solvent, before charging into the reduction furnace, pretreatment such as mixing and / or granulation of crude zinc oxide and limestone can be performed.
[0017]
The crude zinc oxide charged in the reduction furnace is recovered as dust by the evaporation of heavy metal compounds such as zinc or lead contained in the crude zinc oxide in the reduction furnace. Here, halogen components other than fluorine contained in the crude zinc oxide are mixed in the dust, but the fluorine components are often in the form of CaF 2 or calcium / fluorine compounds, and these are volatile decomposition in a reducing atmosphere. Is a property that hardly occurs and is fixed in the reductant residue or reducing slag produced from the reduction furnace.
[0018]
When limestone is added as a solvent, even if the fluorine component is not in the form of calcium / fluorine compound, it forms a calcium / fluorine compound by the reaction between limestone and the fluorine component and is produced from the reduction furnace. Fixed in residue or reduced slag.
[0019]
Metal compounds such as zinc that have been volatilized and recovered in the reduction furnace are recovered as crude zinc oxide with a reduced fluorine component.
[0020]
After this, in the same way as the conventional method, after removing impurities such as chlorine components by wet treatment, firing and granulation in a dry heating furnace, low zinc grade zinc oxide or oxidized Produced as zinc ore.
[0021]
(Example)
One embodiment of the present invention will be described below.
[0022]
[ Reference example ]
(1) Pretreatment process The crude zinc oxide recovered from the steel dust was charged together with the powdery coke.
[0023]
As the reduction furnace, a rotary furnace for reduction roasting used for recovering zinc from steel dust was used.
[0024]
Table 1 shows the Zn, Pb, F, and Cl components of the crude zinc oxide used at this time.
[0025]
[Table 1]
The rotary furnace has an outer diameter of 35 m and a length of 50 m, and is equipped with a heavy oil combustion burner on the discharge end side. Powdered coke was added so as to be about 20% by mass with respect to the crude zinc oxide. After recovery of heavy metal compounds and the like in the reduction furnace, the fluorine quality in the produced reductant residue was about 3.5% by mass, and the fluorine fixation rate to the reductant residue was 80% or more.
[0027]
Table 2 shows the grades of Zn, Pb, and F components in the reductate residue.
[0028]
[Table 2]
Table 3 shows the main component grades of low-fluorine grade crude zinc oxide recovered from the reduction furnace. It is clear that chlorine is still included.
[0030]
[Table 3]
(2) Wet treatment process The crude zinc oxide recovered as dust from the reducing furnace has reduced fluorine, and impurities such as chlorine were removed by wet treatment.
[0032]
(3) First solid-liquid separation step The zinc oxide slurry obtained in the wet treatment step is separated into a zinc oxide cake and a separation liquid.
[0033]
(4) Neutralization treatment process The said separation liquid was neutralized using slaked lime.
[0034]
(5) Second solid-liquid separation step The neutralized starch containing zinc and lead components obtained in the neutralization treatment was subjected to solid-liquid separation using a thickener. After solid-liquid separation, a neutralized starch cake was obtained using a compression-type dehydrator.
[0035]
(6) Firing / granulation step By adding the Zn / Pb metal compound obtained in the reduction step to the zinc oxide cake obtained in the first solid / liquid separation step, and firing / granulation in a dry heating furnace. A zinc oxide sinter with low fluorine quality was obtained.
[0036]
Table 4 shows the main component grades of zinc oxide sinter produced from low-fluorine grade crude zinc oxide. It is clear that chlorine is reduced.
[0037]
[Table 4]
[Example 1 ]
(1) Pretreatment process The crude zinc oxide recovered from steel dust was charged together with steel dust, powdered coke, and powdered limestone.
[0039]
The same reduction roasting rotary furnace as the reference example was used for the reduction furnace.
[0040]
Table 5 shows the main components of the crude zinc oxide used at this time.
[0041]
[Table 5]
Table 6 shows the main components of the steel dust used at this time.
[0043]
[Table 6]
The amount of coarse zinc oxide added is about 12% by mass with respect to steel dust, and the amount of powdered coke is about 20% by mass with respect to the integrated amount of steel dust and crude zinc oxide. Adjustment was made so that the CaO / SiO 2 weight ratio was about 1.8 in terms of the overall quality of the contents. After recovery of heavy metal compounds and the like in a reduction roasting furnace, the fluorine quality in the produced reductant residue was about 1.6% by mass, and the fluorine fixation rate in the reductant residue was about 70%.
[0045]
Table 7 shows the main component qualities in the reduced product residue.
[0046]
[Table 7]
Table 8 shows the main component grades of the low-fluorine grade crude zinc oxide recovered from the reduction furnace.
[0048]
[Table 8]
(2) Wet treatment process The crude zinc oxide with reduced fluorine recovered from the reduction furnace removed impurities such as chlorine by wet treatment.
[0050]
(3) First solid-liquid separation step The zinc oxide slurry obtained in the wet treatment step is separated into a zinc oxide cake and a separation liquid.
[0051]
(4) Neutralization treatment process The said separation liquid was neutralized using slaked lime.
[0052]
(5) Second solid-liquid separation step The neutralized starch containing zinc and lead components obtained in the neutralization treatment was subjected to solid-liquid separation using a thickener. After solid-liquid separation, a neutralized starch cake was obtained using a compression-type dehydrator.
[0053]
(6) Firing and granulation process Fluorine quality by adding the heavy metal compound obtained in the reduction process to the zinc oxide cake obtained in the first solid-liquid separation process and firing and granulating in a dry heating furnace. A low zinc oxide sinter was obtained.
[0054]
Table 9 shows the main component grades of zinc oxide sinter produced from low-fluorine grade crude zinc oxide.
[0055]
[Table 9]
【The invention's effect】
As described above, according to the method for producing zinc oxide sinter or zinc oxide briquette of the present invention, the fluorine component can be fixed in the reductant residue or reduced slag produced from the reduction furnace. The fluorine of the crude zinc oxide that is volatilized and recovered can be reduced.
[0057]
In addition, by reducing the fluorine quality in the crude zinc oxide, other halogen components are removed by wet treatment, and the halogen quality of zinc oxide sinter or zinc oxide briquette obtained from a drying furnace is reduced. Can do.
[Brief description of the drawings]
FIG. 1 is a flowchart showing an embodiment of the present invention.
FIG. 2 is a flowchart showing a conventional crude zinc oxide treatment process.
Claims (1)
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| JP2001136340A JP4715022B2 (en) | 2001-05-07 | 2001-05-07 | Method for producing zinc oxide sinter or zinc oxide briquette |
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| JP4715022B2 true JP4715022B2 (en) | 2011-07-06 |
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| JP5565354B2 (en) * | 2011-03-23 | 2014-08-06 | 住友金属鉱山株式会社 | Method for producing zinc oxide sinter |
| JP6836148B2 (en) * | 2017-01-10 | 2021-02-24 | 住友金属鉱山株式会社 | Treatment method of dioxin-containing exhaust gas |
| CN115612860B (en) * | 2022-10-26 | 2023-09-19 | 云南驰宏资源综合利用有限公司 | Leaching method of high-silicon zinc roasted ore |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50147421A (en) * | 1974-05-18 | 1975-11-26 | ||
| JPS63117911A (en) * | 1986-11-07 | 1988-05-21 | Yasuhiro Inazaki | Method and device for producing zinc white from steel making flue dust |
| JPH042734A (en) * | 1990-04-20 | 1992-01-07 | Sumitomo Heavy Ind Ltd | Method for recovering valuable metal from zinc-containing dust |
| JPH07126762A (en) * | 1993-11-05 | 1995-05-16 | Sumitomo Metal Mining Co Ltd | Production of crude zinc oxide sinter |
| JPH07268500A (en) * | 1994-03-31 | 1995-10-17 | Sumitomo Chem Co Ltd | Treatment of steel making dust |
| JPH07316677A (en) * | 1994-05-23 | 1995-12-05 | Nikko Aen Kk | Method for recovering valuable metal from steelmaking dust |
| JPH07316679A (en) * | 1994-05-31 | 1995-12-05 | Nikko Aen Kk | Treatment of raw material containing zinc and fluorine |
| JPH09157762A (en) * | 1995-12-11 | 1997-06-17 | Sumitomo Metal Mining Co Ltd | Production of crude zinc oxide sintered ore |
| JP2000128530A (en) * | 1998-10-30 | 2000-05-09 | Mitsui Mining & Smelting Co Ltd | Treatment of crude zinc oxide powder |
-
2001
- 2001-05-07 JP JP2001136340A patent/JP4715022B2/en not_active Expired - Lifetime
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50147421A (en) * | 1974-05-18 | 1975-11-26 | ||
| JPS63117911A (en) * | 1986-11-07 | 1988-05-21 | Yasuhiro Inazaki | Method and device for producing zinc white from steel making flue dust |
| JPH042734A (en) * | 1990-04-20 | 1992-01-07 | Sumitomo Heavy Ind Ltd | Method for recovering valuable metal from zinc-containing dust |
| JPH07126762A (en) * | 1993-11-05 | 1995-05-16 | Sumitomo Metal Mining Co Ltd | Production of crude zinc oxide sinter |
| JPH07268500A (en) * | 1994-03-31 | 1995-10-17 | Sumitomo Chem Co Ltd | Treatment of steel making dust |
| JPH07316677A (en) * | 1994-05-23 | 1995-12-05 | Nikko Aen Kk | Method for recovering valuable metal from steelmaking dust |
| JPH07316679A (en) * | 1994-05-31 | 1995-12-05 | Nikko Aen Kk | Treatment of raw material containing zinc and fluorine |
| JPH09157762A (en) * | 1995-12-11 | 1997-06-17 | Sumitomo Metal Mining Co Ltd | Production of crude zinc oxide sintered ore |
| JP2000128530A (en) * | 1998-10-30 | 2000-05-09 | Mitsui Mining & Smelting Co Ltd | Treatment of crude zinc oxide powder |
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| JP2002326814A (en) | 2002-11-12 |
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