JPS6318650B2 - - Google Patents
Info
- Publication number
- JPS6318650B2 JPS6318650B2 JP1380484A JP1380484A JPS6318650B2 JP S6318650 B2 JPS6318650 B2 JP S6318650B2 JP 1380484 A JP1380484 A JP 1380484A JP 1380484 A JP1380484 A JP 1380484A JP S6318650 B2 JPS6318650 B2 JP S6318650B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- sludge
- reducing agent
- dust
- metal
- 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
Links
- 239000002893 slag Substances 0.000 claims description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 29
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 239000000428 dust Substances 0.000 claims description 16
- 239000003638 chemical reducing agent Substances 0.000 claims description 15
- 239000010802 sludge Substances 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 229910001018 Cast iron Inorganic materials 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000012320 chlorinating reagent Substances 0.000 claims description 7
- 238000006722 reduction reaction Methods 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 150000002739 metals Chemical class 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 150000002736 metal compounds Chemical class 0.000 claims description 2
- 239000004484 Briquette Substances 0.000 description 12
- 238000011084 recovery Methods 0.000 description 8
- 230000005291 magnetic effect Effects 0.000 description 6
- 229910001021 Ferroalloy Inorganic materials 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 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
Description
本発明は反応熱源として各種金属製練炉や溶解
炉から排出される高温の溶滓が持つ顕熱を用い、
ステンレス鋼等の特殊鋼のダスト、スラツジ類中
に含有されている有価金属、特にNi、次いでFe
を濃縮回収する方法に関するものである。
特殊鋼製造に際して発生するダスト、スラツジ
類は酸化鉄を主成分とするが、数パーセントの
Niを含みながら低品位であり、しかもCr、Pb、
Zn、Cu、Cd、Ｓ、Ｆなどの有害成分も含むため
に、Ni原料としての活用も出来ずに産業廃棄物
として多額の費用をかけて処分されている。
一方製鉄業において発生する高炉、転炉、電気
炉、合金鉄用電気炉などの各種炉から排出される
溶滓は高温のまま排出されておりその莫大な熱エ
ネルギーは未利用のまま無駄に放冷されているの
が現状である。
そこで本願は上記の未利用熱エネルギーの利用
に着目し、特殊鋼ダスト、スラツジ類をこれらの
高温溶滓中に投入して、そのエネルギーにより有
用成分主としてNiをメタル再生回収すると共に、
他の成分は完全に滓化せしめて無公害化処理する
ことを目的としたものである。
この種の研究としては本願出願人が以前に研究
出願した特願昭48−111306（特開昭50−61304号）
（溶滓を利用した製鋼ダスト、スラツジからの有
価金属回収方法）があり、この方法は還元剤を内
装したダスト、スラツジのブリケツトまたはペレ
ツトを作り、転炉や電気炉の溶滓鍋底にあらかじ
め入れておいて、その上から高温の溶滓を流入す
る方法であるが、この方法によると製鋼操業の変
化に対応したブリケツトまたはペレツトの装入適
正量の調節が出来ず、時として未反応ダスト、ス
ラツジのブリケツトまたはペレツトの残る欠点を
有していることが確認出来た。
そこで本願発明方法では上記の欠点を解消し、
さらに有価金属の回収を容易として有害成分の無
公害化処理をより完全ならしめようとする方法を
提供するものであり、その要旨とするところは、
第１工程：特殊鋼ダスト、スラツジ類と、該ダス
ト、スラツジ類中の金属化合物と反応するに必
要な量の還元剤と鋳鉄粉及び塩化剤とを混合塊
成化する。
第２工程：第１工程で得られた塊成化物を乾燥予
熱する。
第３工程：第２工程で得られた乾燥塊成化物を高
温溶滓と共に溶滓鍋内に装入し、該溶滓の持つ
顕熱により塩化還元反応を生起せしめ、主とし
てNi、Feの有価金属をメタル化させる。
第４工程：溶滓鍋内の物を冷却凝固し、次いで破
砕した後通常の選鉱手段でメタル化したNi、
Feを回収する。
上記の各工程より成る溶滓顕熱を利用した特殊
鋼ダスト、スラツジ類からの有価金属回収方法で
ありこの際に用いる還元剤としてアルミ粉やフエ
ロシリコンでも支障はないが通常はコークス粉や
木炭粉等の炭素質還元剤を用い、又塩化剤として
は通常安価なCaCl2やNaClを用いる。
なお第１工程ではダスト、スラツジ類に還元剤
と鋳鉄粉及び塩化剤を共に添加混練して、ブリケ
ツトまたはペレツト状に塊成化するが、炭素質還
元剤を用いる場合その添加量は該炭素質還元剤と
鋳鉄粉に含まれる炭素量がNi還元に必要な理論
量の１〜５倍、塩化剤の添加量はCaCl2やNaCl
を用いる場合Niを塩化するに必要な理論量の0.5
〜1.5倍とすることが好ましく、又炭素質還元剤
の粒度は約５m/m以下、又鋳鉄粉の粒度は約３
ｍ／ｍ以下が好ましい。
次に第２工程は第１工程で得られた塊成化物に
含まれる水分を乾燥除去する工程で、過剰の水分
が存在すると、NiCl2＋H2O→NiO＋2HCl又は、
FeCl2＋H2O→FeO＋2HCl等で示される加水分解
をおこし、NiやFeの塩化反応が阻害されること
を防止する為に必要であり、また水分による溶滓
顕熱の熱損失を防止する為にも重要である。更に
溶滓中に投入された塊成化物の破裂粉化を防止す
る上からも効果を有する。
第３工程は高温の溶滓中に第２工程よりの塊成
化物を投入する工程で、溶滓鍋への落下乱流また
は高圧気体吹き込みや機械的撹拌による人工乱流
によつて塊成化物を溶滓中に投入せしめ顕熱によ
るNi、Feの塩化還元反応を促進する工程である
が、Ni、Fe化合物は先ずNiCl2、FeCl2となつて
気体化し、次いで炭素質還元剤と鋳鉄粉表面に還
元されたメタルとして析出する。即ちその析出機
構はＣ、Feが塩化反応（NiO＋2HCl→NiCl2＋
H2O）で発生したTH2Oを分解してH2を発生さ
せるために、H2分圧の高くなる炭素質還元剤と
鋳鉄粉の表面でNiCl2が還元されメタルHiが析出
するものと思われる。この場合に鋳鉄粉は強磁性
であるために、Ni析出が少なく磁性の弱い炭素
質還元剤粒子が存在しても、微粒磁極効果によつ
て容易に磁着し、析出Niは磁力選鉱によつて回
収される特徴を有する。しかして塊成化物の投入
量は溶滓顕熱に応じた量が大切で、通常溶滓量の
約30％以下である。
次に本発明を合金鉄溶滓に応用した場合を第１
図を参酌し乍ら詳述する。
図中１は合金鉄用電気炉、２は合金鉄メタル用
の取鍋、３は溶滓鍋、４は溶滓、５は乾燥予熱さ
れたブリケツト、６はブリケツト投入用フイダ
ー、７はブリケツト乾燥予熱装置、８は製団機、
９は処理を完了した溶滓、１０は選鉱装置を示
す。
合金鉄用電気炉１から出湯されたメタルと溶滓
はメタル用の取鍋２内で比重分離されて、溶滓４
のみが次の溶滓鍋３中に溢流落下して貯留され
る。一方ダスト、スラツジ類と炭素質還元剤、鋳
鉄粉及び塩化剤とを混合して、また必要によつて
は製団用のバインダーを加えて、製団機８でブリ
ケツトを作り、乾燥予熱装置７によつて乾燥予熱
されたプリケツト５はフイダー６に準備する。
しかして溶滓４が溶滓鍋３に落下する時に乾燥
予熱ブリケツト５をフイダー６から同時に落下せ
しめて溶滓鍋３内で良く混合し溶滓４の顕熱を充
分にプリケツトに伝達せしめて、ブリケツト中の
NiやFeの塩化還元反応を促進する。ブリケツト
内の温度が約800℃以上になると、あたかも密閉
容器に類似したプリケツト内で塩化還元反応が起
こり主としてメタルNiの生成を見るものである
が、Feの一部も同様の反応によつてメタル化す
るので実際にはFe−Ni合金の生成となる。
次いで処理を完了した溶滓９は放流または溶滓
鍋３内で冷却凝固された後に、選鉱工程１０に送
つて破砕、磁力選鉱、比重選鉱などによつてNi
を主体とした還元メタル粒を回収する。
以下本発明の試験実施例を示す。
試験実施例
エルー式電気炉１ｔでフエロクロムスラグを再
溶解して作つた約600Kgの溶滓を第２図にて示す
ごとく鉄製の溶滓鍋３に流入して、次いで溶滓中
にランスパイプ１１を挿入、高圧空気にて溶滓を
バブリングさせながら、あらかじめステンレス製
鋼ダスト100重量部に外割りで粉コークス15重量
部と鋳鉄粉10重量部と塩化カルシユーム５重量部
を内装して製団し充分に乾燥したブリケツト50Kg
を１分間に５Kgの投入速度で溶滓中に挿入した後
に約３時間放置し転倒凝固せしめて、常温に冷却
後−３m/m以下に粉砕して磁力選鉱を行つた結
果は下記のごとくであつた。
※電気炉から出湯時の溶滓温度 1600℃
※ブリケツト投入完了時の溶滓温度 1400℃
※磁力選鉱結果
The present invention uses sensible heat possessed by high-temperature slag discharged from various metal smelting furnaces and melting furnaces as a reaction heat source,
Valuable metals contained in dust and sludge of special steel such as stainless steel, especially Ni, followed by Fe.
The present invention relates to a method for concentrating and recovering . The dust and sludge generated during the manufacture of special steel are mainly composed of iron oxide, but a few percent of the dust and sludge are
Although it contains Ni, it is of low quality, and it also contains Cr, Pb,
Because it contains harmful components such as Zn, Cu, Cd, S, and F, it cannot be used as a Ni raw material and is disposed of as industrial waste at great expense. On the other hand, the slag discharged from various furnaces such as blast furnaces, converters, electric furnaces, and electric furnaces for ferroalloys generated in the steel industry remains at a high temperature, and a huge amount of thermal energy is wasted unused. The current situation is that it is cold. Therefore, this application focuses on the use of the above-mentioned unused thermal energy, and puts special steel dust and sludge into these high-temperature slags, and uses the energy to regenerate and recover Ni as a useful component as a metal.
The purpose of the other components is to completely turn them into slag and make them non-polluting. As for this type of research, the applicant of this application has previously applied for research in Japanese Patent Application No. 111306 (Sho 48-111306) (Japanese Unexamined Patent Application No. 50-61304)
There is a method for recovering valuable metals from steelmaking dust and sludge using molten slag.This method involves making briquettes or pellets of dust and sludge containing a reducing agent and placing them in the bottom of the slag pot of a converter or electric furnace in advance. However, with this method, it is not possible to adjust the appropriate amount of briquettes or pellets to be charged in response to changes in steelmaking operations, and sometimes unreacted dust, It was confirmed that the sludge had residual defects of briquettes or pellets. Therefore, the method of the present invention solves the above drawbacks,
Furthermore, the present invention provides a method that facilitates the recovery of valuable metals and makes the pollution-free treatment of harmful components more complete. A reducing agent, cast iron powder, and a chlorinating agent in an amount necessary to react with the metal compounds in the dust and sludge are mixed and agglomerated. Second step: Dry and preheat the agglomerated product obtained in the first step. 3rd step: The dried agglomerates obtained in the 2nd step are charged into a slag pot together with high-temperature slag, and the sensible heat of the slag causes a chloride-reduction reaction, mainly containing valuable Ni and Fe. Metalizes metal. 4th step: The material in the slag pot is cooled and solidified, then crushed and then metalized using normal beneficiation methods.
Collect Fe. This is a method of recovering valuable metals from special steel dust and sludge using the sensible heat of the slag consisting of each of the above steps.Although there is no problem with aluminum powder or ferrosilicon as the reducing agent used at this time, coke powder or A carbonaceous reducing agent such as charcoal powder is used, and CaCl 2 or NaCl, which are usually inexpensive, is used as a chlorinating agent. In the first step, a reducing agent, cast iron powder, and chlorinating agent are added to the dust and sludge and kneaded together to agglomerate them into briquettes or pellets. If a carbonaceous reducing agent is used, the amount added is The amount of carbon contained in the reducing agent and cast iron powder is 1 to 5 times the theoretical amount required for Ni reduction, and the amount of chlorinating agent added is CaCl 2 or NaCl.
0.5 of the theoretical amount required to chloride Ni when using
The particle size of the carbonaceous reducing agent is preferably about 5 m/m or less, and the particle size of the cast iron powder is about 3.
m/m or less is preferable. Next, the second step is a step of drying and removing the moisture contained in the agglomerated product obtained in the first step. If excess moisture is present, NiCl 2 + H 2 O → NiO + 2HCl or
It is necessary to prevent the chlorination reaction of Ni and Fe from being inhibited by causing the hydrolysis shown by FeCl 2 + H 2 O → FeO + 2HCl, etc., and to prevent the heat loss of sensible heat of the slag due to moisture. It is also important. Furthermore, it is also effective in preventing the agglomerated material introduced into the slag from bursting into powder. The third step is a step in which the agglomerates from the second step are introduced into the high-temperature slag, and the agglomerates are removed by turbulence falling into the slag pot or by artificial turbulence caused by high-pressure gas blowing or mechanical stirring. In this process, the Ni and Fe compounds are injected into the slag to promote the chloride-reduction reaction of Ni and Fe by sensible heat.The Ni and Fe compounds first become NiCl 2 and FeCl 2 and gasify, and then the carbonaceous reducing agent and cast iron powder are added to the slag. Precipitates as reduced metal on the surface. In other words, the precipitation mechanism is a chlorination reaction of C and Fe (NiO + 2HCl → NiCl 2 +
In order to decompose TH 2 O generated in H 2 O to generate H 2 , a carbonaceous reducing agent that increases the partial pressure of H 2 is used, and NiCl 2 is reduced on the surface of cast iron powder and metal Hi is precipitated. I think that the. In this case, since cast iron powder is ferromagnetic, even if carbonaceous reducing agent particles with little Ni precipitation and weak magnetism are present, they are easily magnetized by the fine magnetic pole effect, and precipitated Ni is removed by magnetic beneficiation. It has the characteristic that it can be recovered easily. It is important, however, that the amount of agglomerate added is in accordance with the sensible heat of the slag, and is usually about 30% or less of the amount of slag. Next, the first case where the present invention is applied to ferroalloy slag will be described.
The details will be explained with reference to the figure. In the figure, 1 is an electric furnace for ferroalloy metal, 2 is a ladle for ferroalloy metal, 3 is a slag ladle, 4 is slag, 5 is a dry and preheated briquette, 6 is a feeder for charging briquettes, and 7 is a drying briquette. Preheating device, 8 is a dough making machine,
9 shows the slag that has been processed, and 10 shows the ore processing device. The metal and molten slag tapped from the electric furnace 1 for ferroalloy are separated by specific gravity in the metal ladle 2, and the molten slag 4
Only the slag overflows and falls into the next slag pot 3 and is stored there. On the other hand, the dust and sludge are mixed with a carbonaceous reducing agent, cast iron powder, and a chlorinating agent, and if necessary, a binder for briquette making is added to make briquettes using a briquetting machine 8, and a drying preheating device 7 The pre-heated pre-dried pricket 5 is prepared in the feeder 6. When the molten slag 4 falls into the slag ladle 3, the dry preheated briquette 5 is simultaneously dropped from the feeder 6 and is mixed well in the slag ladle 3, so that the sensible heat of the molten slag 4 is sufficiently transferred to the briquette. in briquette
Promotes the chloride-reduction reaction of Ni and Fe. When the temperature inside the briquette reaches approximately 800°C or higher, a chloride-reduction reaction occurs within the briquette, which is similar to a closed container, mainly producing metal Ni, but some of the Fe is also converted to metal through the same reaction. In reality, Fe-Ni alloy is formed. Next, the treated slag 9 is discharged or cooled and solidified in the slag ladle 3, and then sent to the beneficiation process 10 where Ni is removed by crushing, magnetic beneficiation, specific gravity beneficiation, etc.
Collect reduced metal grains mainly consisting of Test examples of the present invention will be shown below. Test Example Approximately 600 kg of slag made by re-melting ferrochrome slag in a 1 ton Elou type electric furnace flows into an iron slag ladle 3 as shown in Figure 2, and then is immersed into the slag. Pipe 11 is inserted, and while bubbling the slag with high-pressure air, 100 parts by weight of stainless steel dust is mixed with 15 parts by weight of coke powder, 10 parts by weight of cast iron powder, and 5 parts by weight of calcium chloride. 50kg of thoroughly dried briquettes
was inserted into the slag at a rate of 5 kg per minute, left for about 3 hours to solidify by falling over, cooled to room temperature, crushed to less than -3 m/m, and subjected to magnetic beneficiation. The results are as follows. It was hot. *Temperature of slag at the time of tapping from the electric furnace 1600℃ *Temperature of slag at the time of completion of charging the briquette 1400℃ *Results of magnetic beneficiation
【表】
上記の結果より磁着メタル中の成分回収率を計
算してみると、
Ni回収率＝15Kg×0.0418／50Kg×0.0138×100＝90.87
（％）
Fe回収率＝15Kg×0.7033／50Kg×0.3246×100＝65.00
（％）
Cr回収率＝15Kg×0.0554／50Kg×0.0523×100＝31.78
（％）
となり、特にNiの回収率が高く次いでFeと続き、
Crの回収は極めて低く、本発明は塩化容易なNi
の回収に有利な塩化還元反応の特長を良く表して
いる。
以上の試験実施例のごとく、これらの特殊鋼ダ
スト、スラツジ類に含有されているNiは低品位
であり、しかもFe、Crなどの他成分も共存する
ためにその活用が困難であつたが、本発明によれ
ばNiの選択濃縮回収が可能であり極めて有利で
ある。
しかも従来無駄にされていた溶滓顕熱を有効に
活用すると共に、公害問題上深刻化しているダス
ト、スラツジ類の無公害化処理がNi、Feの回収
と同時に実施し得ることは産業上極めて意義が大
きい。[Table] Calculating the component recovery rate in the magnetic metal from the above results, Ni recovery rate = 15Kg x 0.0418/50Kg x 0.0138 x 100 = 90.87
(%) Fe recovery rate = 15Kg x 0.7033/50Kg x 0.3246 x 100 = 65.00
(%) Cr recovery rate = 15Kg x 0.0554/50Kg x 0.0523 x 100 = 31.78
(%), Ni has a particularly high recovery rate, followed by Fe.
The recovery of Cr is extremely low, and the present invention is suitable for Ni, which is easily chlorinated.
The characteristics of the chloride-reduction reaction, which is advantageous for the recovery of As shown in the above test examples, the Ni contained in these special steel dusts and sludges is of low grade and also contains other components such as Fe and Cr, making it difficult to utilize it. According to the present invention, it is possible to selectively concentrate and recover Ni, which is extremely advantageous. In addition, it is extremely industrially possible to make effective use of the sensible heat of the slag, which was previously wasted, and to decontaminate dust and sludge, which are becoming increasingly serious pollution problems, at the same time as recovering Ni and Fe. It has great significance.
第１図は本願方法の工程説明図、第２図は本発
明を開発した試験実施例の説明図。
図中、１：電気炉、２：メタル用取鍋、３：溶
滓鍋、４：溶滓、５：乾燥ブリケツト、６：ブリ
ケツト投入フイダー、７：ブリケツト乾燥予熱装
置、８：製団機、９：処理後の溶滓、１０：選鉱
工程、１１：高圧空気ランスパイプ。
FIG. 1 is an explanatory diagram of the process of the present method, and FIG. 2 is an explanatory diagram of a test example in which the present invention was developed. In the figure, 1: electric furnace, 2: metal ladle, 3: slag ladle, 4: slag, 5: dry briquette, 6: briquette feeder, 7: briquette drying preheater, 8: briquetting machine, 9: Slag after treatment, 10: Mineral beneficiation process, 11: High pressure air lance pipe.
Claims (1)
殊鋼ダスト、スラツジ類からの有価金属回収方
法。 第１工程：特殊鋼ダスト、スラツジ類と、該ダス
ト、スラツジ類中の金属化合物と反応するに必
要な量の還元剤と鋳鉄粉及び塩化剤とを混合塊
成化する。 第２工程：第１工程で得られた塊成化物を乾燥予
熱する。 第３工程：第２工程で得られた乾燥塊成化物を高
温溶滓と共に溶滓鍋内に装入し、該溶滓の持つ
顕熱により塩化還元反応を生起せしめ、主とし
てNi、Feの有価金属をメタル化させる。 第４工程：溶滓鍋内の物を冷却凝固し、次いで破
砕した後通常の選鉱手段でメタル化したNi、
Feを回収する。 ２ 第１工程で用いる還元剤が炭素質還元剤であ
ることを特徴とする特許請求の範囲第１項記載の
方法。 ３ 第１工程で用いる塩化剤が、CaCl2あるいは
NaClであることを特徴とする特許請求の範囲第
１項若しくは第２項記載の方法。 ４ 第３工程で溶滓鍋内に、乾燥塊成化物と高温
溶滓とを装入するに際しそれらを同時に装入する
ことを特徴とする特許請求の範囲第１項〜第３項
のいずれかに記載の方法。[Claims] 1. A method for recovering valuable metals from special steel dust and sludge using the sensible heat of slag, which comprises the following steps. First step: Special steel dust and sludge are mixed and agglomerated with a reducing agent, cast iron powder, and chlorinating agent in amounts necessary to react with the metal compounds in the dust and sludge. Second step: Dry and preheat the agglomerated product obtained in the first step. 3rd step: The dried agglomerates obtained in the 2nd step are charged into a slag pot together with high-temperature slag, and the sensible heat of the slag causes a chloride-reduction reaction, mainly containing valuable Ni and Fe. Metalizes metal. 4th step: The material in the slag pot is cooled and solidified, then crushed and then metalized using normal beneficiation methods.
Collect Fe. 2. The method according to claim 1, wherein the reducing agent used in the first step is a carbonaceous reducing agent. 3 The chlorinating agent used in the first step is CaCl 2 or
3. The method according to claim 1 or 2, wherein NaCl is used. 4. Any one of claims 1 to 3, characterized in that in the third step, the dry agglomerated material and the high-temperature slag are charged at the same time into the slag pot. The method described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59013804A JPS60159128A (en) | 1984-01-27 | 1984-01-27 | Method for recovering valuable metal from special steel dust, sludge or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59013804A JPS60159128A (en) | 1984-01-27 | 1984-01-27 | Method for recovering valuable metal from special steel dust, sludge or the like |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60159128A JPS60159128A (en) | 1985-08-20 |
| JPS6318650B2 true JPS6318650B2 (en) | 1988-04-19 |
Family
ID=11843445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59013804A Granted JPS60159128A (en) | 1984-01-27 | 1984-01-27 | Method for recovering valuable metal from special steel dust, sludge or the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60159128A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018108801A1 (en) * | 2016-12-14 | 2018-06-21 | Stena Recycling International Aktiebolag | A method for treating waste material comprising one or more oxidized metals |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51129802A (en) * | 1975-05-02 | 1976-11-11 | Nippon Jiryoku Senko Kk | A process for treatment of steelmaking dust and sludge of electric fur ances using sensible heat of slag |
| JPS53122604A (en) * | 1977-03-31 | 1978-10-26 | Nippon Jiriyoku Senkou Kk | Treatment of melted slag |
-
1984
- 1984-01-27 JP JP59013804A patent/JPS60159128A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51129802A (en) * | 1975-05-02 | 1976-11-11 | Nippon Jiryoku Senko Kk | A process for treatment of steelmaking dust and sludge of electric fur ances using sensible heat of slag |
| JPS53122604A (en) * | 1977-03-31 | 1978-10-26 | Nippon Jiriyoku Senkou Kk | Treatment of melted slag |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60159128A (en) | 1985-08-20 |
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