JP3080947B1 - Electric furnace dust treatment method - Google Patents
Electric furnace dust treatment methodInfo
- Publication number
- JP3080947B1 JP3080947B1 JP18157799A JP18157799A JP3080947B1 JP 3080947 B1 JP3080947 B1 JP 3080947B1 JP 18157799 A JP18157799 A JP 18157799A JP 18157799 A JP18157799 A JP 18157799A JP 3080947 B1 JP3080947 B1 JP 3080947B1
- Authority
- JP
- Japan
- Prior art keywords
- zinc
- electric furnace
- nitric acid
- dust
- solution
- 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 - Fee Related
Links
- 239000000428 dust Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 56
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000011701 zinc Substances 0.000 claims abstract description 71
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 64
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 63
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 54
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 47
- 229910052742 iron Inorganic materials 0.000 claims abstract description 36
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 30
- 239000011787 zinc oxide Substances 0.000 claims abstract description 27
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 21
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 150000002739 metals Chemical class 0.000 claims abstract description 11
- 238000002386 leaching Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 3
- 150000003752 zinc compounds Chemical class 0.000 abstract description 3
- 238000005868 electrolysis reaction Methods 0.000 description 24
- 239000011133 lead Substances 0.000 description 17
- 239000010949 copper Substances 0.000 description 14
- 229910052793 cadmium Inorganic materials 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 8
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 5
- 229910052745 lead Inorganic materials 0.000 description 5
- 229910021645 metal ion Inorganic materials 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- -1 for example Substances 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Electrolytic Production Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
【要約】
【課題】 亜鉛又は亜鉛化合物を含む原料から純亜鉛及
び／又は酸化亜鉛を効率よく回収できる亜鉛の回収方
法、及びこれを用いて金属類を効果的にリサイクルでき
る電気炉ダストの処理方法を提供する。
【解決手段】 亜鉛の回収方法は、亜鉛又は亜鉛化合物
を含む原料を、硝酸で浸出して硝酸亜鉛の溶液を形成
し、溶液を電気分解して、純亜鉛及び/ 又は酸化亜鉛を
回収する。また、電気炉ダストの処理方法は、電気炉か
ら発生するダストと希硝酸とを混合し、ｐＨを調整して
ダストに含まれる鉄分を除く重金属類を希硝酸中に浸出
し、鉄分を除く重金属類が浸出した溶液に亜鉛を加え、
亜鉛よりイオン化傾向の小さい重金属を析出させて回収
し、重金属が除去されて、硝酸亜鉛を含む溶液を電気分
解し、純亜鉛及び／又は酸化亜鉛を回収する。Kind Code: A1 A method for recovering zinc, which can efficiently recover pure zinc and / or zinc oxide from a raw material containing zinc or a zinc compound, and a method for treating electric furnace dust, which can effectively recycle metals using the same. I will provide a. SOLUTION: In a method for recovering zinc, a raw material containing zinc or a zinc compound is leached with nitric acid to form a zinc nitrate solution, and the solution is electrolyzed to recover pure zinc and / or zinc oxide. The method of treating electric furnace dust is to mix the dust generated from the electric furnace with diluted nitric acid, adjust the pH, and leach heavy metals other than iron contained in the dust into the diluted nitric acid to remove heavy metals excluding iron. Add zinc to the leached solution
A heavy metal having a lower ionization tendency than zinc is precipitated and recovered, and the heavy metal is removed. The solution containing zinc nitrate is electrolyzed to recover pure zinc and / or zinc oxide.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電気分解による亜
鉛の回収方法を用いた電気炉ダストの処理方法に関す
る。The present invention relates to a method for treating electric furnace dust using a method for recovering zinc by electrolysis.
【０００２】[0002]
【従来の技術】現在、日本において電気炉から発生する
ダストは、年間約５０万ｔにも及んでいる。この電気炉
ダスト中には多量のＺｎが含まれているため、この電気
炉ダスト中のＺｎを回収する必要があるが、現在、この
処理が施されているのは発生量の約６５％程度であり、
残りの約３５％は未処理のままで埋立て処分がなされて
いる。この方法としては、電気炉ダスト中のＺｎＯを高
温下で還元揮発させて前記ダストから高純度のＺｎＯを
回収する乾式法が採用されている。また、Ｚｎ（Ｚｎ
Ｏ）を回収した後のダストは高濃度の鉄分を含有するに
もかかわらず、電気炉にリサイクルされることなく埋立
てや路盤材として使用されてきたが、最近ではこの用途
にも限界がみえてきている。2. Description of the Related Art At present, dust generated from electric furnaces in Japan reaches about 500,000 tons per year. Since a large amount of Zn is contained in the electric furnace dust, it is necessary to recover Zn in the electric furnace dust. However, this treatment is currently performed at about 65% of the generated amount. And
The remaining 35% is landfilled untreated. As this method, a dry method is employed in which ZnO in electric furnace dust is reduced and volatilized at a high temperature to recover high-purity ZnO from the dust. In addition, Zn (Zn
Although the dust after recovery of O) contains a high concentration of iron, it has been used as landfill and roadbed material without being recycled into an electric furnace, but recently its use has seen limitations. Is coming.
【０００３】[0003]
【発明が解決しようとする課題】前記した従来の乾式法
においては、高温で処理するため非常に高いエネルギー
を必要とする。従って、経済的な面からみるとダスト処
理規模の大きい方が効率的であるが、一般に一製鉄所の
電気炉から発生する電気炉ダストの量はそれほど多くな
く、これらを一か所に収集して処理するための運搬等を
考慮すると効果的な処理方法とはいえない。また、高い
エネルギーを必要とするにもかかわらず、現在の乾式法
ではＺｎＯが完全に還元されず、亜鉛を十分に回収でき
ないという問題がある。更に、還元後の残りのダストは
埋立てや路盤材として使用されているが、このダスト中
には未還元の亜鉛の他、鉛、カドミウム、クロム等も含
まれているため環境上好ましくない。本発明はかかる事
情に鑑みてなされたもので、亜鉛又は亜鉛化合物を含む
原料から亜鉛及び／又は酸化亜鉛を効率よく回収できる
亜鉛の回収方法を用いて鉄分も含めた重金属類を効果的
にリサイクルできる電気炉ダストの処理方法を提供する
ことを目的とする。In the above-mentioned conventional dry method, very high energy is required for processing at a high temperature. Therefore, from the economic point of view, the larger the dust treatment scale is, the more efficient it is.However, in general, the amount of electric furnace dust generated from an electric furnace at a steelworks is not so large, and these are collected in one place. It is not an effective treatment method in consideration of transportation for treatment. In addition, despite the need for high energy, the present dry method has a problem that ZnO is not completely reduced and zinc cannot be sufficiently recovered. Further, the remaining dust after reduction is used as a landfill or as a roadbed material. However, in addition to unreduced zinc, lead, cadmium, chromium and the like are contained in this dust, which is not environmentally preferable. The present invention has been made in view of the above circumstances, and effectively recycles heavy metals including iron using a zinc recovery method capable of efficiently recovering zinc and / or zinc oxide from a raw material containing zinc or a zinc compound. An object of the present invention is to provide a method for treating electric furnace dust that can be performed.
【０００４】[0004]
【課題を解決するための手段】前記目的に沿う第１の発
明に係る電気炉ダストの処理方法は、電気炉から発生す
るダストと希硝酸とを混合し、ｐＨを調整して前記ダス
トに含まれる鉄分を除く重金属類を前記希硝酸中に浸出
させる第１工程と、前記鉄分を除く重金属類が浸出した
溶液に亜鉛を加え、亜鉛よりイオン化傾向の小さい重金
属を析出させて回収する第２工程と、前記重金属が除去
されて、硝酸亜鉛を含む溶液を電気分解し、純亜鉛及び
／又は酸化亜鉛を回収する第３工程を有する。これによ
り、第１工程においては、選択的に電気炉ダスト中に含
まれる鉄分以外の重金属類を浸出させるので、鉄分を浸
出残渣として回収することができる。また、第２工程に
おいては、亜鉛よりイオン化傾向の小さな金属、例えば
鉛、銅、カドミウム等を析出させることができる。そし
て、第３工程においては、第２工程で鉛、銅、カドミウ
ム等を回収した後の溶液を電気分解することにより純亜
鉛及び／又は酸化亜鉛を回収することができる。According to a first aspect of the present invention, there is provided a method for treating dust in an electric furnace, comprising mixing dust generated from an electric furnace with dilute nitric acid, adjusting the pH thereof, and including the dust in the dust. A first step of leaching heavy metals excluding iron components into the diluted nitric acid, and a second step of adding zinc to a solution in which the heavy metals excluding iron components are leached to precipitate and recover heavy metals having a smaller ionization tendency than zinc. And a third step of electrolyzing a solution containing zinc nitrate from which the heavy metals are removed to recover pure zinc and / or zinc oxide. Thereby, in the first step, heavy metals other than iron contained in the electric furnace dust are selectively leached, so that iron can be recovered as leaching residue. In the second step, a metal having a lower ionization tendency than zinc, for example, lead, copper, cadmium, or the like can be deposited. Then, in the third step, pure zinc and / or zinc oxide can be recovered by electrolyzing the solution after recovering lead, copper, cadmium and the like in the second step.
【０００５】第１の発明に係る電気炉ダストの処理方法
において、前記ｐＨは、３〜５の範囲にあることが望ま
しい。ｐＨが３未満では、鉄分（Ｆｅ（III ））が浸出
して溶液中に入る可能性があり、一方、ｐＨが５を超え
るときには、鉄分以外の他の金属、例えばＣｕ2+、Ｐｂ
2+、Ｃｄ2+等が溶液中に浸出しない可能性がある。これ
により、鉄を溶液中に沈殿物として除去することが可能
となる。また、第１の発明に係る電気炉ダストの処理方
法において、第３工程で純亜鉛及び／又は酸化亜鉛を回
収した残りの硝酸を含む溶液を、第１工程で使用する希
硝酸の一部又は全部として使用することが可能である。
これにより、希硝酸のリサイクルを行うことができる。[0005] In the method for treating electric furnace dust according to the first invention, the pH is preferably in the range of 3 to 5. If the pH is less than 3, iron (Fe (III)) may leach out into the solution, while if the pH exceeds 5, metals other than iron, such as Cu 2+ , Pb
There is a possibility that 2+ , Cd 2+ and the like do not leach into the solution. This makes it possible to remove iron as a precipitate in the solution. Further, in the method for treating electric furnace dust according to the first invention, the solution containing the remaining nitric acid obtained by recovering pure zinc and / or zinc oxide in the third step may be a part of the diluted nitric acid used in the first step or It can be used as a whole.
Thereby, the dilute nitric acid can be recycled.
【０００６】前記目的に沿う第２の発明に係る電気炉ダ
ストの処理方法は、電気炉から発生するダストと希硝酸
とを混合し、前記ダストに含まれる金属類を前記希硝酸
中に浸出させる第１工程と、前記金属類を浸出した溶液
から、鉄を除去する第２工程と、前記鉄を除去した溶液
に亜鉛を加え、亜鉛よりイオン化傾向の小さい金属を析
出させて回収する第３工程と、前記金属が除去されて、
硝酸亜鉛を含む溶液を電気分解し、純亜鉛及び／又は酸
化亜鉛を回収する第４工程を有する。これにより、第１
工程においては、電気炉ダスト中に含まれる金属類を浸
出させるので、ｐＨの厳密な制御が必要なくなる。ま
た、第２工程においては、浸出した溶液中から鉄のみを
除去することができるので、鉄分を浸出残渣として回収
することができる。そして、第３工程においては、亜鉛
よりイオン化傾向の小さな金属、例えば鉛、銅、カドミ
ウム等を析出させることができる。そして、第４工程に
おいては、第３工程で鉛、銅、カドミウム等を回収した
後の溶液を電気分解することにより純亜鉛及び／又は酸
化亜鉛を回収することができる。According to a second aspect of the present invention, there is provided a method for treating dust in an electric furnace, wherein dust generated from an electric furnace is mixed with dilute nitric acid, and metals contained in the dust are leached into the dilute nitric acid. A first step, a second step of removing iron from the solution in which the metals have been leached, and a third step of adding zinc to the solution from which the iron has been removed to precipitate and recover a metal having a lower ionization tendency than zinc. And the metal is removed,
The method includes a fourth step of electrolyzing a solution containing zinc nitrate to recover pure zinc and / or zinc oxide. Thereby, the first
In the process, metals contained in the electric furnace dust are leached, so that strict control of pH is not required. Further, in the second step, only iron can be removed from the leached solution, so that iron can be recovered as a leaching residue. In the third step, a metal having a lower ionization tendency than zinc, for example, lead, copper, cadmium, or the like can be deposited. Then, in the fourth step, pure zinc and / or zinc oxide can be recovered by electrolyzing the solution after recovering lead, copper, cadmium and the like in the third step.
【０００７】第２の発明に係る電気炉ダストの処理方法
において、第４工程で純亜鉛及び／又は酸化亜鉛を回収
した残りの硝酸を含む溶液を、第１工程で使用する希硝
酸の一部又は全部として使用することが可能である。こ
れにより、希硝酸のリサイクルを行うことができる。In the method for treating electric furnace dust according to a second aspect of the present invention, the solution containing the remaining nitric acid from which pure zinc and / or zinc oxide has been recovered in the fourth step is partially used as the diluted nitric acid used in the first step. Alternatively, it can be used as a whole. Thereby, the dilute nitric acid can be recycled.
【０００８】[0008]
【発明の実施の形態】続いて、添付した図面を参照しつ
つ、本発明を具体化した実施の形態につき説明し、本発
明の理解に供する。ここに、図１は本発明の一実施の形
態に係る電気炉ダストの処理方法の工程説明図、図２は
同電気炉ダストの処理方法における電気分解の説明図、
図３は本発明の他の実施の形態に係る電気炉ダストの処
理方法の工程説明図、図４は同電気炉ダストの処理方法
における電気分解の説明図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a process explanatory view of a method for treating electric furnace dust according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of electrolysis in the method for treating electric furnace dust,
FIG. 3 is a process explanatory view of a method of treating electric furnace dust according to another embodiment of the present invention, and FIG. 4 is an explanatory view of electrolysis in the method of treating electric furnace dust.
【０００９】図１及び図２に示すように、本発明の一実
施の形態に係る電気炉ダストの処理方法においては、ま
ず溶解槽１０に電気炉から発生したダスト約１０００ｋ
ｇを入れる。次いで、希硝酸を加えて溶液のｐＨを３〜
５の範囲、例えばｐＨ４程度に調整する。そして、所定
時間、例えば１〜２時間程度攪拌を行う。これにより電
気炉ダスト中に含まれる鉄分を除く重金属類、例えばＺ
ｎ、Ｐｂ、Ｃｕ、Ｃｄ等は、硝酸溶液中に浸出する。一
方、ＣａＯ、ＳｉＯ2 等のスラグ分等を含む未溶解の鉄
分は、浸出残渣として回収される（第１工程）。ここ
で、この浸出残渣は約７４０ｋｇであって、鉄分品位は
４０〜５０％であることから、再び電気炉に戻して再利
用することができる。また、沈澱物にはＺｎＯ・Ｆｅ2
Ｏ3 も含まれるが、これも同様に電気炉に戻して再利用
することできる。As shown in FIGS. 1 and 2, in the method for treating electric furnace dust according to one embodiment of the present invention, first, about 1000 k of dust generated from an electric furnace is placed in a melting tank 10.
g. Then, the pH of the solution was adjusted to 3 to 3 by adding diluted nitric acid.
The pH is adjusted to a range of 5, for example, about pH 4. Then, stirring is performed for a predetermined time, for example, about 1 to 2 hours. Thereby, heavy metals except iron contained in electric furnace dust, for example, Z
n, Pb, Cu, Cd, etc. leach into the nitric acid solution. On the other hand, undissolved iron components including slag components such as CaO and SiO 2 are recovered as leaching residues (first step). Here, the leaching residue is about 740 kg and the iron content is 40 to 50%, so that it can be returned to the electric furnace and reused. In addition, ZnO.Fe 2
O 3 is also included, but can also be returned to the electric furnace and reused.
【００１０】次に、上澄み液を清浄槽１１に移し、これ
に亜鉛を２０ｋｇ程度加え、所定時間（例えば１〜２時
間程度）攪拌する。亜鉛は、イオン化傾向のより小さな
金属イオン、例えばＰｂ2+、Ｃｕ2+、Ｃｄ2+等と置換し
て金属イオン（Ｚｎ2+）となって溶解する。一方、亜鉛
よりイオン化傾向の小さな重金属は析出する。そして、
上澄み液（析出物を除く溶液）を次の工程で使用する電
解槽１２に移し、析出した重金属（Ｐｂ、Ｃｕ、Ｃｄ
等）を回収する（第２工程）。次いで、前記重金属が除
去（回収）された溶液を電解槽１２で電気分解する。図
２に示すように、電気分解に使用する電解槽１２は、図
示しない恒温水槽によって一定の温度、例えば６０℃程
度に保持されていて、この電解槽１２の中に第２工程で
重金属を回収した後の硝酸亜鉛を含む溶液が入れられ
る。また、電解槽１２内には、例えば白金板からなるア
ノード（陽極）１３と、例えばアルミニウムからなるカ
ソード（陰極）１４が設けられて、アノード１３とカソ
ード１４の端部はそれぞれ直流電源１５に接続されてい
る。Next, the supernatant liquid is transferred to the cleaning tank 11 and about 20 kg of zinc is added thereto and stirred for a predetermined time (for example, about 1 to 2 hours). Zinc dissolves as a metal ion (Zn 2+ ) by substituting with a metal ion having a lower ionization tendency, for example, Pb 2+ , Cu 2+ , Cd 2+ or the like. On the other hand, heavy metals having a smaller ionization tendency than zinc precipitate. And
The supernatant (solution excluding the precipitate) was transferred to the electrolytic cell 12 used in the next step, and the deposited heavy metals (Pb, Cu, Cd
Etc.) (second step). Next, the solution from which the heavy metals have been removed (recovered) is electrolyzed in the electrolytic bath 12. As shown in FIG. 2, an electrolytic cell 12 used for electrolysis is maintained at a constant temperature, for example, about 60 ° C. by a constant temperature water tank (not shown), and heavy metals are recovered in the electrolytic cell 12 in a second step. The solution containing the zinc nitrate after the addition is introduced. Further, an anode (anode) 13 made of, for example, a platinum plate and a cathode (cathode) 14 made of, for example, aluminum are provided in the electrolytic cell 12, and the ends of the anode 13 and the cathode 14 are respectively connected to a DC power supply 15. Have been.
【００１１】この装置を用いて電気分解を行う場合、直
流電源１５を用いて通電することにより、アノード１３
側では、２Ｈ2 Ｏ→４Ｈ+ ＋Ｏ2 ＋４ｅ- という反応が
起こって、酸素を発生する。また、カソード１４側にお
いては、２Ｚｎ2+＋４ｅ- →２Ｚｎという反応が起こっ
て亜鉛が析出する。電気分解終了後、この析出した純亜
鉛及び／又は酸化亜鉛を回収する（第３工程）。また、
アノード１３で生じた４Ｈ+ は溶液中の４( ＮＯ3 - ）
と結びついて硝酸（ＨＮＯ3 ）を再生する。この再生し
た硝酸を含む溶液は、溶解槽１０に戻すことにより第１
工程で加える希硝酸の一部又は全部として使用すること
ができる。When electrolysis is performed using this device, the anode 13 is energized by using a DC power supply 15 to supply electricity.
On the side, a reaction of 2H 2 O → 4H + + O 2 + 4e − occurs to generate oxygen. On the cathode 14 side, a reaction of 2Zn 2+ + 4e − → 2Zn occurs, and zinc is deposited. After completion of the electrolysis, the precipitated pure zinc and / or zinc oxide is recovered (third step). Also,
4H + generated at the anode 13 is converted into 4 (NO 3 − ) in the solution.
To regenerate nitric acid (HNO 3 ). The regenerated solution containing nitric acid is returned to the dissolving tank 10 so that
It can be used as part or all of the diluted nitric acid added in the process.
【００１２】次に、図３及び図４に、本発明の他の実施
の形態に係る電気炉ダストの処理方法を示す。まず溶解
槽２０に電気炉から発生したダスト約１０００ｋｇを入
れる。次いで、希硝酸を加えて溶液のｐＨを１以下、例
えばｐＨ１程度に調整する。そして、所定時間、例えば
１〜２時間程度攪拌を行う。これにより電気炉ダスト中
に含まれる金属類、例えばＺｎ、Ｆｅ、Ｐｂ、Ｃｕ、Ｃ
ｄ等は、硝酸溶液中に浸出する。一方、ＳｉＯ2 、Ｃａ
Ｏ等の未溶解のスラグ分は、酸性浸出を利用しているた
め、他の金属元素が付着していない純度の高い浸出残渣
として回収することができる（第１工程）。なお、この
浸出残渣は約１９０ｋｇであることから、スラグとして
再利用することもできる。Next, FIGS. 3 and 4 show a method of treating electric furnace dust according to another embodiment of the present invention. First, about 1000 kg of dust generated from an electric furnace is put into the melting tank 20. Next, the pH of the solution is adjusted to 1 or less, for example, about pH 1 by adding diluted nitric acid. Then, stirring is performed for a predetermined time, for example, about 1 to 2 hours. Thereby, metals contained in the electric furnace dust, for example, Zn, Fe, Pb, Cu, C
d and the like leach into the nitric acid solution. On the other hand, SiO 2 , Ca
Since the undissolved slag such as O uses acidic leaching, it can be recovered as a highly pure leaching residue to which other metal elements are not attached (first step). Since the leach residue is about 190 kg, it can be reused as slag.
【００１３】また、上澄み液を脱鉄槽２１に移し、Ｆｅ
3+にＮａＯＨ等を添加し、ｐＨ３程度まで中和すること
で、Ｆｅ（ＯＨ）3 の水酸化物として沈澱させ回収す
る。ここでは、金属が浸出している溶液と有機溶媒とを
混合し、その金属を抽出する溶媒抽出法を採用して、溶
液中のＦｅ3+のみを選別除去している（第２工程）。こ
の沈澱物には、ＺｎＯ等の付着物がなく、鉄の純度が高
いため、再び電気炉に戻して再利用する必要はなく、リ
サイクルしやすい。次に、鉄を除去した液を清浄槽２２
に移し、これに亜鉛を２０ｋｇ程度加え、所定時間（例
えば１〜２時間程度）攪拌する。亜鉛は、イオン化傾向
のより小さな金属イオン、例えばＰｂ2+、Ｃｕ2+、Ｃｄ
2+等と置換して金属イオン（Ｚｎ2+）となって溶解す
る。Further, the supernatant is transferred to a deironing tank 21 and Fe
By adding NaOH or the like to 3+ and neutralizing to about pH 3 , it precipitates and recovers as a hydroxide of Fe (OH) 3 . Here, a solution in which a metal is leached is mixed with an organic solvent, and only the Fe 3+ in the solution is selectively removed by a solvent extraction method of extracting the metal (second step). Since this precipitate has no deposits such as ZnO and has a high iron purity, it does not need to be returned to an electric furnace and reused, and is easy to recycle. Next, the liquid from which iron has been removed is placed in a cleaning tank 22.
, And about 20 kg of zinc is added thereto, followed by stirring for a predetermined time (for example, about 1 to 2 hours). Zinc is a metal ion having a lower ionization tendency, such as Pb 2+ , Cu 2+ , Cd
It dissolves as metal ions (Zn 2+ ) by replacing with 2+ and the like.
【００１４】一方、亜鉛よりイオン化傾向の小さな金属
は析出する。そして、上澄み液（析出物を除く溶液）を
次の工程で使用する電解槽２３に移し、析出した金属
（Ｐｂ、Ｃｕ、Ｃｄ等）を回収する（第３工程）。次い
で、亜鉛よりイオン化傾向の小さい金属が除去（回収）
された溶液を電解槽２３で電気分解する。図４に示すよ
うに、電気分解に使用する電解槽２３は、図示しない恒
温水槽によって一定の温度、例えば６０℃程度に保持さ
れていて、この電解槽２３の中に第４工程で金属を回収
した後の硝酸亜鉛を含む溶液が入れられる。また、電解
槽２３内には、例えば白金板からなるアノード（陽極）
２４と、例えばアルミニウムからなるカソード（陰極）
２５が設けられて、アノード２４とカソード２５の端部
はそれぞれ直流電源２６に接続されている。On the other hand, metals having a lower ionization tendency than zinc precipitate. Then, the supernatant liquid (solution excluding the precipitate) is transferred to the electrolytic cell 23 used in the next step, and the deposited metal (Pb, Cu, Cd, etc.) is collected (third step). Next, metal with a lower ionization tendency than zinc is removed (recovered)
The solution thus obtained is electrolyzed in the electrolytic cell 23. As shown in FIG. 4, the electrolytic cell 23 used for the electrolysis is maintained at a constant temperature, for example, about 60 ° C. by a constant temperature water tank (not shown), and the metal is recovered in the electrolytic cell 23 in the fourth step. The solution containing the zinc nitrate after the addition is introduced. An anode (anode) made of, for example, a platinum plate is provided in the electrolytic cell 23.
24 and a cathode made of, for example, aluminum (cathode)
An anode 24 and an end of the cathode 25 are connected to a DC power supply 26, respectively.
【００１５】この装置を用いて電気分解を行う場合、直
流電源２６を用いて通電することにより、アノード２４
側では、２Ｈ2 Ｏ→４Ｈ+ ＋Ｏ2 ＋４ｅ- という反応が
起こって、酸素を発生する。また、カソード２５側にお
いては、２Ｚｎ2+＋４ｅ- →２Ｚｎという反応が起こっ
て亜鉛が析出する。電気分解終了後、この析出した純亜
鉛及び／又は酸化亜鉛を回収する（第４工程）。また、
アノード２４で生じた４Ｈ+ は溶液中の４( ＮＯ3 - ）
と結びついて硝酸（ＨＮＯ3 ）を再生する。この再生し
た硝酸を含む溶液は、溶解槽２０に戻すことにより第１
工程で加える希硝酸の一部又は全部として使用すること
ができる。When electrolysis is carried out using this apparatus, the anode 24
On the side, a reaction of 2H 2 O → 4H + + O 2 + 4e − occurs to generate oxygen. On the cathode 25 side, a reaction of 2Zn 2+ + 4e − → 2Zn occurs, and zinc is deposited. After completion of the electrolysis, the deposited pure zinc and / or zinc oxide is recovered (fourth step). Also,
The 4H + generated at the anode 24 is 4 (NO 3 − ) in the solution.
To regenerate nitric acid (HNO 3 ). The regenerated solution containing nitric acid is returned to the dissolving tank 20 so that
It can be used as part or all of the diluted nitric acid added in the process.
【００１６】以上の工程で電気炉から発生するダストを
処理することにより亜鉛の他、鉄、鉛等の回収を効率よ
く行うことができ、これらの有効利用を図ることが可能
となる。また、使用する希硝酸は再生して繰り返し使用
することができ、全体として経済的に電気炉ダストの処
理を行うことが可能となる。By treating the dust generated from the electric furnace in the above steps, zinc, iron, lead and the like can be efficiently recovered in addition to zinc, and these can be effectively used. In addition, the diluted nitric acid used can be regenerated and used repeatedly, and the electric furnace dust can be economically treated as a whole.
【００１７】[0017]
【実施例】次に、本発明に係る電気炉ダストの処理方法
の実施例を示す。ここでは、表１に示す組成の電気炉ダ
ストを使用して、図１の工程をもとに以下の処理を行っ
た。Next, an embodiment of a method for treating electric furnace dust according to the present invention will be described. Here, the following treatment was performed based on the process of FIG. 1 using electric furnace dust having the composition shown in Table 1.
【００１８】[0018]
【表１】 [Table 1]
【００１９】まず、電気炉ダスト１００ｇに水１０００
ｃｃを加え、更に硝酸を加えてｐＨ＝４に調製し、６０
分間攪拌を行った。そして、溶液の成分の分析を行っ
た。その結果を表２（ＮＯ．１）に示す。なお、表中の
ＮＤは、Ｎｏｔ Ｄｅｔｅｃｔｅｄの略であり、検出さ
れなかったことを示す。First, 100 g of electric furnace dust was added to 1000 g of water.
cc, and further add nitric acid to adjust pH = 4,
Stirring was performed for minutes. Then, the components of the solution were analyzed. The results are shown in Table 2 (No. 1). Note that ND in the table is an abbreviation of Not Detected, and indicates that no detection was performed.
【００２０】[0020]
【表２】 [Table 2]
【００２１】この結果より、Ｆｅの含有量は４．４ｐｐ
ｍと極微量となっており、鉄分は溶液中にほとんど残存
していないことがわかる。次に、前記同様、電気炉ダス
ト１００ｇに水１０００ｃｃを加え、更に硝酸を加えて
ｐＨ＝４に調製し、６０分間攪拌を行い、存在する沈澱
物（鉄）を回収した後に亜鉛２．５２ｇを加えて更に６
０分間攪拌を行った。そして、溶液の成分の分析を行っ
た。その結果を表２（ＮＯ．２）に示す。この結果よ
り、Ｃｄ、Ｐｂ、Ｃｕ、は硝酸のみを加えて攪拌したと
き（表２（ＮＯ．１））と比べて明らかに減少してい
る。これより、溶液中に存在していた金属イオン（Ｃｄ
2+、Ｐｂ2+、Ｃｕ2+）は亜鉛と置換し、金属となって析
出したことがわかる。From the results, the Fe content was 4.4 pp.
m, which means that the iron content hardly remains in the solution. Next, in the same manner as described above, 1000 cc of water was added to 100 g of the electric furnace dust, and nitric acid was further added to adjust the pH to 4, and the mixture was stirred for 60 minutes to collect the precipitate (iron). 6 more
Stirring was performed for 0 minutes. Then, the components of the solution were analyzed. The results are shown in Table 2 (NO. 2). From these results, Cd, Pb, and Cu were clearly reduced as compared with the case where only nitric acid was added and stirred (Table 2 (NO. 1)). From this, the metal ions (Cd
2+ , Pb 2+ , and Cu 2+ ) were replaced with zinc, and were found to be deposited as metal.
【００２２】更に、電気分解による亜鉛の回収を行っ
た。なお、アノードには白金電極を、カソードにはアル
ミニウム電極を用いた。電解液は、亜鉛１０ｇ／リット
ル、ｐＨ３の溶液であり、希硝酸に酸化亜鉛を溶解させ
て作成した。電解温度は６０℃、定電流法で電解時間は
１時間とした。その後、カソードに析出した亜鉛の量を
キレート滴定により定量した。その結果を表３に示す。Furthermore, zinc was recovered by electrolysis. Note that a platinum electrode was used for the anode, and an aluminum electrode was used for the cathode. The electrolyte was a solution of zinc 10 g / liter, pH 3, and was prepared by dissolving zinc oxide in dilute nitric acid. The electrolysis temperature was 60 ° C., and the electrolysis time was 1 hour by the constant current method. Thereafter, the amount of zinc deposited on the cathode was determined by chelate titration. Table 3 shows the results.
【００２３】[0023]
【表３】 [Table 3]
【００２４】表３から、電流密度の増加に伴い析出亜鉛
量は増加しており、硝酸を用いた電気分解による亜鉛の
回収は容易に実施できることがわかった。また、本電気
分解においては容易に高電流効率が得られ、工業的にも
有用なものであることがわかった。なお、電流効率が１
００％を超えているが、これは一部、一価のＺｎが生成
したためではないかと考えられる。また、電解時間を２
時間にして同様の実験を行ったが、亜鉛の析出量は電気
量に比例して大きくなるものの、その他の特別な変化は
生じなかった。ここで、本実施例に係る電気分解におい
ては、希硝酸に酸化亜鉛を溶解させた溶液を使用した
が、前記表２（ＮＯ．２）に示す組成の溶液で電気分解
を行っても同様に亜鉛を容易に回収することができる。From Table 3, it can be seen that the amount of zinc deposited increases with an increase in current density, and that zinc can be easily recovered by electrolysis using nitric acid. In addition, high current efficiency was easily obtained in the electrolysis, and it was found that the electrolysis was industrially useful. The current efficiency is 1
Although it exceeds 00%, it is considered that this is partly due to the generation of monovalent Zn. In addition, the electrolysis time is 2
A similar experiment was performed at a later time, but the amount of zinc deposited increased in proportion to the quantity of electricity, but no other special changes occurred. Here, in the electrolysis according to this example, a solution obtained by dissolving zinc oxide in dilute nitric acid was used, but the electrolysis was also performed using a solution having the composition shown in Table 2 (NO. 2). Zinc can be easily recovered.
【００２５】以上、本発明を実施の形態を参照して説明
してきたが、本発明は何ら上記した実施の形態に記載の
構成に限定されるものでなく、特許請求の範囲に記載さ
れている事項の範囲内で考えられるその他の実施の形態
や変形例も含むものである。例えば、溶解槽と清浄槽は
別々の槽を用いたが、同一槽内で処理を行うことも可能
である。また、電気分解においてアノードには白金を用
いたがチタン合金、ステンレスを用いることも可能であ
り、カソードにはアルミニウムを用いたがステンレスを
用いることも可能である。As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and is described in the claims. Other embodiments and modifications that can be considered within the scope of the matter are also included. For example, although the dissolving tank and the cleaning tank are separate tanks, the treatment can be performed in the same tank. In the electrolysis, platinum was used for the anode, but a titanium alloy or stainless steel could be used, and aluminum was used for the cathode, but stainless steel could be used.
【００２６】[0026]
【発明の効果】請求項１〜３に記載の電気炉ダストの処
理方法においては、第１工程において、電気炉から発生
するダストと希硝酸とを混合し、ｐＨを調整してダスト
に含まれる鉄分を除く重金属類を希硝酸中に浸出させる
ため、ダストに含まれる鉄分を浸出残渣に移行すること
ができ、その結果、電気炉ダストから鉄（分）を容易に
回収することができる。また、第２工程においては、鉄
分を除く重金属類が浸出した溶液に亜鉛を加え、亜鉛よ
りイオン化傾向の小さい金属を析出させて回収するた
め、鉛等の有価金属を容易に回収することができる。そ
して、第３工程においては、第２工程で鉛、銅、カドミ
ウム等を回収した後の溶液を電気分解するため、電解時
における電流効率が良く、更に、純度の高い純亜鉛及び
／又は酸化亜鉛を回収することができる。したがって、
第１工程から第３工程の処理により、電気炉ダストから
容易に効率よく含まれる金属を回収することができ、そ
れぞれの成分の有効利用を図ることが可能となる。According to the method for treating electric furnace dust according to any one of claims 1 to 3, in the first step, the dust generated from the electric furnace is mixed with dilute nitric acid, and the pH is adjusted to be included in the dust. Since heavy metals other than iron are leached in dilute nitric acid, iron contained in dust can be transferred to leaching residue, and as a result, iron (min) can be easily recovered from electric furnace dust. In addition, in the second step, zinc is added to the solution in which heavy metals other than iron are leached, and a metal having a smaller ionization tendency than zinc is precipitated and collected, so that valuable metals such as lead can be easily collected. . In the third step, the solution obtained by recovering lead, copper, cadmium and the like in the second step is electrolyzed, so that the current efficiency during electrolysis is good and the pure zinc and / or zinc oxide having high purity is further obtained. Can be recovered. Therefore,
By the processes of the first to third steps, the contained metal can be easily and efficiently recovered from the electric furnace dust, and the respective components can be effectively used.
【００２７】特に、請求項２記載の電気炉ダストの処理
方法においては、ｐＨを３〜５の範囲にするので、他の
余分な金属を沈澱させることなく、確実に鉄（Ｆｅ（II
I ））を浸出残渣に移行させることができ、後の工程に
おいて、鉄分を含まない、純度の高い金属を回収するこ
とができる。In particular, in the method for treating electric furnace dust according to the second aspect, since the pH is in the range of 3 to 5, the iron (Fe (II)
I)) can be transferred to the leaching residue, and in a later step, a highly pure metal that does not contain iron can be recovered.
【００２８】請求項３記載の電気炉ダストの処理方法に
おいては、第３工程で純亜鉛及び／又は酸化亜鉛を回収
した残りの硝酸を含む溶液を、第１工程で使用する希硝
酸の一部又は全部として使用するので、希硝酸のリサイ
クルを行うことができ、省コストにすることができる。[0028] In the method for treating electric furnace dust according to claim 3, the solution containing the remaining nitric acid obtained by recovering pure zinc and / or zinc oxide in the third step is a part of the diluted nitric acid used in the first step. Alternatively, since it is used as a whole, the dilute nitric acid can be recycled, and the cost can be reduced.
【００２９】請求項４及び５に記載の電気炉ダストの処
理方法においては、第１工程において、電気炉から発生
するダストと希硝酸とを混合するため、ダストに含まれ
る金属類を希硝酸中に浸出させることができる。また、
第２工程においては、金属類を浸出した溶液から鉄を除
去するため、第３工程において、鉄分を含まない純度の
高い金属を回収することができる。そして、第３工程に
おいて、鉄を除去した溶液に亜鉛を加え、亜鉛よりイオ
ン化傾向の小さい金属を析出、回収するため、純度の高
い金属が回収でき、また、第４工程の電気分解時の電流
効率を高めることが可能となる。更に、この第４工程に
おいては、金属が除去された硝酸亜鉛を含む溶液を電気
分解するため、純度が高い純亜鉛及び／又は酸化亜鉛を
回収することができる。したがって、第１工程から第４
工程までの処理により、電気炉ダストから容易に効率よ
く含まれる金属を回収することができ、それぞれの成分
の有効を図ることが可能となる。In the method for treating electric furnace dust according to claims 4 and 5, in the first step, dust generated from the electric furnace is mixed with dilute nitric acid. Can be leached. Also,
In the second step, iron is removed from the solution in which the metals have been leached. Therefore, in the third step, a highly pure metal containing no iron can be recovered. Then, in the third step, zinc is added to the solution from which the iron has been removed, and a metal having a lower ionization tendency is deposited and recovered, so that a highly pure metal can be recovered. Efficiency can be increased. Further, in the fourth step, since the solution containing zinc nitrate from which the metal has been removed is electrolyzed, pure zinc and / or zinc oxide having high purity can be recovered. Therefore, from the first step to the fourth step
By the processing up to the step, the metal contained can be easily and efficiently recovered from the electric furnace dust, and the respective components can be effectively used.
【００３０】特に、請求項５記載の電気炉ダストの処理
方法においては、第４工程で純亜鉛及び／又は酸化亜鉛
を回収した残りの硝酸を含む溶液を、第１工程で使用す
る希硝酸の一部又は全部として使用するので、希硝酸の
リサイクルを行うことができ、省コストにすることがで
きる。In particular, in the method for treating electric furnace dust according to the fifth aspect, the solution containing the remaining nitric acid obtained by recovering pure zinc and / or zinc oxide in the fourth step is converted to the diluted nitric acid used in the first step. Since it is used as part or all, dilute nitric acid can be recycled, and the cost can be reduced.
【図１】本発明の一実施の形態に係る電気炉ダストの処
理方法の工程説明図である。FIG. 1 is a process explanatory view of an electric furnace dust treatment method according to an embodiment of the present invention.
【図２】同電気炉ダストの処理方法における電気分解の
説明図である。FIG. 2 is an explanatory view of electrolysis in the electric furnace dust treatment method.
【図３】本発明の他の実施の形態に係る電気炉ダストの
処理方法の工程説明図である。FIG. 3 is a process explanatory view of a method for treating electric furnace dust according to another embodiment of the present invention.
【図４】同電気炉ダストの処理方法における電気分解の
説明図である。FIG. 4 is an explanatory view of electrolysis in the method for treating electric furnace dust.
１０：溶解槽、１１：清浄槽、１２：電解槽、１３：ア
ノード、１４：カソード、１５：直流電源、２０：溶解
槽、２１：脱鉄槽、２２：清浄槽、２３：電解槽、２
４：アノード、２５：カソード、２６直流電源10: Dissolution tank, 11: Cleaning tank, 12: Electrolysis tank, 13: Anode, 14: Cathode, 15: DC power supply, 20: Dissolution tank, 21: Deironing tank, 22: Cleaning tank, 23: Electrolysis tank, 2
4: anode, 25: cathode, 26 DC power supply
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C25C 1/16 C22B 3/00,7/02 B09B 3/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) C25C 1/16 C22B 3/00, 7/02 B09B 3/00
Claims (5)
混合し、ｐＨを調整して前記ダストに含まれる鉄分を除
く重金属類を前記希硝酸中に浸出させる第１工程と、 前記鉄分を除く重金属類が浸出した溶液に亜鉛を加え、
亜鉛よりイオン化傾向の小さい重金属を析出させて回収
する第２工程と、 前記重金属が除去されて、硝酸亜鉛を含む溶液を電気分
解し、純亜鉛及び／又は酸化亜鉛を回収する第３工程を
有することを特徴とする電気炉ダストの処理方法。A first step of mixing dust generated from an electric furnace with diluted nitric acid, adjusting pH, and leaching heavy metals other than iron contained in the dust into the diluted nitric acid; Add zinc to the solution from which heavy metals have been leached,
A second step of depositing and recovering a heavy metal having a smaller ionization tendency than zinc, and a third step of recovering pure zinc and / or zinc oxide by removing the heavy metal and electrolyzing a solution containing zinc nitrate. A method for treating electric furnace dust.
において、前記ｐＨは、３〜５の範囲にあることを特徴
とする電気炉ダストの処理方法。2. The method for treating electric furnace dust according to claim 1, wherein the pH is in the range of 3 to 5.
理方法において、第３工程で純亜鉛及び／又は酸化亜鉛
を回収した残りの硝酸を含む溶液は、第１工程で使用す
る希硝酸の一部又は全部として使用することを特徴とす
る電気炉ダストの処理方法。3. The method for treating electric furnace dust according to claim 1, wherein the solution containing the remaining nitric acid from which pure zinc and / or zinc oxide is recovered in the third step is diluted nitric acid used in the first step. A method for treating electric furnace dust, wherein the method is used as a part or all of an electric furnace.
混合し、前記ダストに含まれる金属類を前記希硝酸中に
浸出させる第１工程と、 前記金属類を浸出した溶液から、鉄を除去する第２工程
と、 前記鉄を除去した溶液に亜鉛を加え、亜鉛よりイオン化
傾向の小さい金属を析出させて回収する第３工程と、 前記金属が除去されて、硝酸亜鉛を含む溶液を電気分解
し、純亜鉛及び／又は酸化亜鉛を回収する第４工程を有
することを特徴とする電気炉ダストの処理方法。4. A first step of mixing dust generated from an electric furnace with dilute nitric acid and leaching metals contained in the dust into the diluted nitric acid, and removing iron from the solution leached with the metals. A second step of removing, a third step of adding zinc to the solution from which the iron has been removed, and precipitating and recovering a metal having a lower ionization tendency than zinc; and A method for treating electric furnace dust, comprising a fourth step of decomposing and recovering pure zinc and / or zinc oxide.
において、第４工程で純亜鉛及び／又は酸化亜鉛を回収
した残りの硝酸を含む溶液は、第１工程で使用する希硝
酸の一部又は全部として使用することを特徴とする電気
炉ダストの処理方法。5. The method for treating electric furnace dust according to claim 4, wherein the solution containing the remaining nitric acid from which pure zinc and / or zinc oxide has been recovered in the fourth step is one of the diluted nitric acid used in the first step. A method for treating electric furnace dust, wherein the method is used as part or all.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18157799A JP3080947B1 (en) | 1999-02-05 | 1999-06-28 | Electric furnace dust treatment method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2848899 | 1999-02-05 | ||
| JP11-28488 | 1999-02-05 | ||
| JP18157799A JP3080947B1 (en) | 1999-02-05 | 1999-06-28 | Electric furnace dust treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP3080947B1 true JP3080947B1 (en) | 2000-08-28 |
| JP2000290736A JP2000290736A (en) | 2000-10-17 |
Family
ID=26366599
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18157799A Expired - Fee Related JP3080947B1 (en) | 1999-02-05 | 1999-06-28 | Electric furnace dust treatment method |
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| Country | Link |
|---|---|
| JP (1) | JP3080947B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367603A (en) * | 2016-12-07 | 2017-02-01 | 中南大学 | Method of recycling zinc from blast furnace dust |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5281779B2 (en) * | 2007-09-20 | 2013-09-04 | Ｄｏｗａメタルマイン株式会社 | Method for producing zinc electrolyte |
| WO2014181833A1 (en) * | 2013-05-08 | 2014-11-13 | 株式会社キノテック・ソーラーエナジー | Zinc production method |
| WO2015030235A1 (en) * | 2013-09-02 | 2015-03-05 | 株式会社キノテック・ソーラーエナジー | Zinc production method using electric furnace dust as raw material |
-
1999
- 1999-06-28 JP JP18157799A patent/JP3080947B1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367603A (en) * | 2016-12-07 | 2017-02-01 | 中南大学 | Method of recycling zinc from blast furnace dust |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000290736A (en) | 2000-10-17 |
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