JPH0138856B2 - - Google Patents
Info
- Publication number
- JPH0138856B2 JPH0138856B2 JP479581A JP479581A JPH0138856B2 JP H0138856 B2 JPH0138856 B2 JP H0138856B2 JP 479581 A JP479581 A JP 479581A JP 479581 A JP479581 A JP 479581A JP H0138856 B2 JPH0138856 B2 JP H0138856B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- electric furnace
- dust
- zinc
- added
- 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 27
- 239000000428 dust Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 12
- 229910052725 zinc Inorganic materials 0.000 claims description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 10
- 239000011133 lead Substances 0.000 claims description 9
- 241000718541 Tetragastris balsamifera Species 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 7
- 238000009628 steelmaking Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000005587 bubbling Effects 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 239000010454 slate Substances 0.000 claims description 3
- 229910052793 cadmium Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims 1
- 239000011651 chromium Substances 0.000 claims 1
- 238000003756 stirring Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 6
- 238000010828 elution Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000010438 granite Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 239000011787 zinc oxide Substances 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)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
本願発明方法は電気炉製鋼に於て発生するZn，
Pb，Cr及びCdの有害重金属を含む電気炉ダスト
を、溶融状態にある製鋼スラグの顕熱を有効利用
して一部を還元物質とか塩化物を入れて直接金属
を気化させる揮化回収し有効資源として再利用す
ると共に、残留分を製鋼スラグ中に固定化処理を
行なう方法に関するものである。
従来、電気炉ダストは鉄、亜鉛、鉛等の有用な
酸化物を主に含有する産業廃棄物であるが、その
中に大量の亜鉛を含有するために高炉原料に再利
用できず、かつ有害金属を含有するためにこれら
の溶出抑制処理を行なつて法令に適合しなければ
埋立・投棄処分も行なうことは出来なかつた。現
状ではダスト処理業者、亜鉛製錬メーカー等に送
り粗亜鉛回収原料として処理を依頼している状態
である。
本願発明の方法はこの電気炉ダストを処理する
方法として溶融スラグの有する顕熱を有効利用
し、新たに熱を加えることなく添加ダスト等を溶
融反応させる方法として、スラグ鍋に受けた溶融
スラグにバブリングガスを吹き込み溶融スラグの
対流を行なわせながら、電気炉ダストおよび高炉
スラグ、赤泥、花崗岩又は花崗閃緑岩の風化物で
あるマサ土、銅カラミ、亜鉛カラミの一種又は二
種以上を添加し、撹拌反応せしめ揮化析出した亜
鉛、鉛等を捕収し集塵機で回収する。
上記反応が終了した溶融スラグはスラグ鍋を傾
動してスラグ処理場に流出させ、又はスラグ鍋内
で自然冷却硬化させ、該硬化物は、破砕・磁選後
路盤材等に有効利用する。しかし添加する電気炉
ダストに鉛の多い場合もあり、この電気炉ダスト
のみを添加して処理するとスラグより鉛イオンを
約0.1〜0.2ppm程溶出することもある。
そこで赤泥、銅カラミ、亜鉛カラミ、花崗岩又
は花崗閃緑岩の風化物であるマサ土、高炉スラグ
の一種又は二種以上を添加すると鉛イオンの溶出
もなく、他の重金属イオンも検出されなくなる。
一方スラグにはＦ・CaO（遊離石灰）、γ−
2CaO・SiO2、Ｆ・MgO（遊離マグネシウム）等
を含有しているので崩壊性を有する。この崩壊性
を防止するためには電気炉ダストのみ添加する場
合は多量に使用しなければならず、この結果スラ
グより鉛イオンの溶出の危険性があるので、赤
泥、カラミ、マサ土等を配合・組み合せて処理し
た方が良い。
なお本願方法に於いて顕熱源として、電気炉ス
ラグを利用する場合には、発生するダストの量に
比して発生する溶融電気炉スラグの量が（顕熱を
考慮して）不足するのでダストの一部は再び電気
炉へ装入する方式を採るのが実操業上は効率的で
ある。転炉や高炉にあつては発生する溶融スラグ
量が多大であるのでこの様な配慮をする必要がな
いのはいうまでもない。
以下本発明方法の実施例を示す。
使用原料の化学分析値を下記第１表に示す。
The method of the present invention is based on Zn, which is generated in electric furnace steelmaking.
Electric furnace dust containing hazardous heavy metals such as Pb, Cr, and Cd can be effectively recovered by volatilization, which uses the sensible heat of molten steelmaking slag to directly vaporize the metals by adding reducing substances or chlorides to some of them. The present invention relates to a method for reusing the slag as a resource and for fixing the residual material in steelmaking slag. Conventionally, electric furnace dust is an industrial waste that mainly contains useful oxides such as iron, zinc, and lead, but because it contains a large amount of zinc, it cannot be reused as a raw material for blast furnaces and is harmful. Since it contains metals, it could not be disposed of in a landfill or dumped unless it was treated to suppress the elution of these metals and comply with laws and regulations. Currently, the raw zinc is sent to dust processing companies, zinc smelting manufacturers, etc. for processing as crude zinc recovery raw material. The method of the present invention effectively utilizes the sensible heat of the molten slag to treat this electric furnace dust, and allows the added dust to undergo a melting reaction without applying additional heat. While blowing bubbling gas to create convection of molten slag, one or more of electric furnace dust, blast furnace slag, red mud, masa soil, which is a weathered product of granite or granodiorite, copper karami, and zinc karami are added. Then, the zinc, lead, etc. that are stirred and reacted are volatilized and precipitated and collected using a dust collector. The molten slag after the above reaction is discharged to a slag processing plant by tilting the slag pot, or is naturally cooled and hardened in the slag pot, and the hardened product is effectively used for roadbed materials etc. after crushing and magnetic separation. However, the electric furnace dust to be added may contain a large amount of lead, and if only this electric furnace dust is added and treated, approximately 0.1 to 0.2 ppm of lead ions may be eluted from the slag. Therefore, if one or more of red mud, copper karami, zinc karami, masa soil which is a weathered product of granite or granodiorite, and blast furnace slag are added, lead ions will not be eluted and other heavy metal ions will not be detected. .
On the other hand, slag contains F・CaO (free lime), γ-
It has disintegrability because it contains 2CaO・SiO 2 , F・MgO (free magnesium), etc. In order to prevent this disintegration, if only electric furnace dust is added, a large amount must be used, and as a result, there is a risk of lead ions being leached from the slag, so red mud, karami, masa soil, etc. It is better to combine and process them. In addition, when electric furnace slag is used as a sensible heat source in the present method, the amount of molten electric furnace slag generated is insufficient (taking sensible heat into consideration) compared to the amount of dust generated. In actual operation, it is efficient to adopt a method in which a part of the raw material is charged back into the electric furnace. It goes without saying that such consideration does not need to be taken in converters and blast furnaces, since the amount of molten slag generated is large. Examples of the method of the present invention are shown below. The chemical analysis values of the raw materials used are shown in Table 1 below.
【表】
上記第１表に示す使用原料についての環境庁告
示方法による溶出試験結果を第２表に示す。[Table] Table 2 shows the elution test results according to the method notified by the Environment Agency for the raw materials used shown in Table 1 above.
【表】
まず代表的な配合組成のものについて下記の如
き各測定を行なつた。ここで該代表的配合組成物
についての配合割合を下記第３表に示す。[Table] First, the following measurements were performed on typical formulations. Here, the blending ratios of the typical blended compositions are shown in Table 3 below.
【表】
〓
〓＊2 マサ土を2重量％、カラミを1重量
％づつ
以下溶出試験結果を第４表に示す。[Table] 〓
*2 Table 4 shows the elution test results for 2% by weight of Masa soil and 1% by weight of Karami.
【表】【table】
【表】
次にスラグ鍋に受けた溶融スラグ（受滓後約５
分、4000Kg）にカロライジング加工をした20A×
5.5mの鋼パイプを装入し、空気を吹込み圧力１
Kg／cm2、吸込み量２m3／分間の条件で吹き込み、
電気炉ダストペレツト（コークス粉約10％入り）
1000Kg、粘板岩とマサ土の配合物（150Kg）を約
４分間で投入し、引き続き４〜５分間空気を吹き
込みその間揮化する酸化亜鉛主体物を回収し、冷
却後のスラグを破砕・磁選処理して溶出試験、路
盤材試験等を行なつた。
この実施例に於ける溶融スラグ、ダストおよび
ダスト処理後のスラグの化学分析値を第５表に、
溶出試験結果を第６表に、揮化回収物の化学分析
値を第７表に、更に路盤材試験結果を第８表にそ
れぞれ示す、なお溶出試験は、環境庁告示13号(ロ)
に基づく方法で、崩壊率試験は、ASTM規格の
オートクレーブ処理法で５〜10mm粒度につき行い
５mm以下を崩壊物とした、又表乾比重及び吸水率
はともにJISA1100による方法で、スリヘリ減量
率はJISA1121による方法で測定した。[Table] Next, the molten slag received in the slag pot (approximately 5
20A x calorized to 4000Kg)
A 5.5m steel pipe is charged and air is blown to a pressure of 1.
Kg/cm 2 , suction amount 2m 3 /min.
Electric furnace dust pellets (contains approx. 10% coke powder)
1,000 kg of slate and masa soil mixture (150 kg) were added for about 4 minutes, and air was then blown for 4 to 5 minutes to collect the main component of zinc oxide that volatilized during that time. After cooling, the slag was crushed and subjected to magnetic separation. We conducted elution tests, roadbed material tests, etc. Table 5 shows the chemical analysis values of the molten slag, dust, and slag after dust treatment in this example.
The elution test results are shown in Table 6, the chemical analysis values of the volatilized recovered material are shown in Table 7, and the roadbed material test results are shown in Table 8.
The disintegration rate test was carried out using the ASTM standard autoclave treatment method for particles with a particle size of 5 to 10 mm, and particles of 5 mm or less were considered to be disintegrated.The surface dry specific gravity and water absorption rate were both determined according to JISA1100, and the droplet weight loss rate was determined according to JISA1121. It was measured by the method according to
【表】【table】
【表】【table】
【表】【table】
【表】
以上述べて来た如く、本願発明方法によれば、
溶融製鋼スラグに還元剤と共に電気炉ダストを装
入する事によつて、例えば略同条件で還元剤無し
で処理した場合に於けるZn，Pbの揮化率に比べ
て約1.5倍近い揮化率を示す。又バブリングガス
の吹込み及び高炉スラグ、赤泥、カラミ、マサ土
及び粘板岩の添加は反応を迅速かつ十分に進行せ
しめ処理後物は無害化されると共に凝塊スラグは
非崩壊性のものとなるので路盤材等の有効利用が
できるという効果がある。[Table] As stated above, according to the method of the present invention,
By charging electric furnace dust with a reducing agent into molten steelmaking slag, the volatilization rate of Zn and Pb is approximately 1.5 times higher than that obtained when processing without a reducing agent under approximately the same conditions. Show rate. In addition, the injection of bubbling gas and the addition of blast furnace slag, red mud, karami, masa soil, and slate make the reaction proceed quickly and sufficiently, so that the treated product becomes harmless and the agglomerated slag becomes non-collapsible. Therefore, there is an effect that roadbed materials etc. can be used effectively.
Claims (1)
吸込みつつ、電気炉製鋼において発生するダスト
及び還元剤を添加すると共に、高炉スラグ、赤
泥、カラミ、マサ土及び粘板岩の一種若しくは二
種以上をも添加し、撹拌しつつ溶融反応を行わし
め揮化する亜鉛、鉛を主体とする金属参加物を回
収すると共に電気炉製鋼において発生するダスト
中に含まれる亜鉛、鉛、クロム及びカドミウム等
の有害物を無公害化することを特徴とする電気炉
ダストの処理方法。1 While sucking gas for bubbling into molten steelmaking slag, dust and reducing agent generated in electric furnace steelmaking are added, and one or more of blast furnace slag, red mud, karami, masa soil, and slate are also added. Then, while stirring, a melting reaction is carried out to recover the volatilized metal components mainly consisting of zinc and lead, and to remove harmful substances such as zinc, lead, chromium and cadmium contained in the dust generated during electric furnace steelmaking. A method for treating electric furnace dust, which is characterized by making it non-polluting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP479581A JPS57120636A (en) | 1981-01-14 | 1981-01-14 | Treatment of electric furnace dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP479581A JPS57120636A (en) | 1981-01-14 | 1981-01-14 | Treatment of electric furnace dust |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57120636A JPS57120636A (en) | 1982-07-27 |
| JPH0138856B2 true JPH0138856B2 (en) | 1989-08-16 |
Family
ID=11593704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP479581A Granted JPS57120636A (en) | 1981-01-14 | 1981-01-14 | Treatment of electric furnace dust |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57120636A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115821037B (en) * | 2022-07-25 | 2025-09-02 | 湖南锐异资环科技有限公司 | A collaborative treatment process for zinc-containing fly ash and red mud in steel mills |
-
1981
- 1981-01-14 JP JP479581A patent/JPS57120636A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57120636A (en) | 1982-07-27 |
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