JPH08323327A - Method for granulating steelmaking dust - Google Patents
Method for granulating steelmaking dustInfo
- Publication number
- JPH08323327A JPH08323327A JP16315095A JP16315095A JPH08323327A JP H08323327 A JPH08323327 A JP H08323327A JP 16315095 A JP16315095 A JP 16315095A JP 16315095 A JP16315095 A JP 16315095A JP H08323327 A JPH08323327 A JP H08323327A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- steelmaking dust
- weight
- steelmaking
- mixture
- 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.)
- Pending
Links
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)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電気炉を用いて製鋼
する際、発生し集塵される製鋼ダストと、製鋼ダストの
リサイクルを促進する目的で添加される炭粉との混合物
から、比較的強度の高い造粒体が得られる造粒方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention compares a steelmaking dust generated and collected during steelmaking using an electric furnace with a carbon powder added for the purpose of promoting the recycling of the steelmaking dust. TECHNICAL FIELD The present invention relates to a granulation method capable of obtaining a granulated body having high dynamic strength.
【０００２】[0002]
【従来の技術】製鋼ダスト中には、金属及び金属酸化物
のほかに、製鋼原料スクラップ中に含有されている塩化
ビニルや加工油から発生した塩素が数％程度含まれてい
る。しかしながら、上記製鋼ダストは、有効な利用方法
がなく、埋め立て処分により廃棄されているので、埋め
立て処分場の確保に多大の用地を必要とする問題があっ
た。そればかりか、この製鋼ダストは、Ｐｂ、Ｃｄ、塩
素化合物等を含むため、そのままでは廃棄できず、安定
化処理して廃棄する必要があったので、この安定化処理
に更に多くの費用を必要とする問題があった。2. Description of the Related Art Steelmaking dust contains, in addition to metals and metal oxides, about several percent of chlorine generated from vinyl chloride and processing oil contained in steelmaking raw material scrap. However, since the steelmaking dust has not been effectively used and is discarded by landfill disposal, there is a problem that a large amount of land is required to secure a landfill disposal site. Not only that, since this steelmaking dust contains Pb, Cd, chlorine compounds, etc., it cannot be disposed of as it is, and it was necessary to stabilize and dispose of it. Therefore, more cost is required for this stabilization treatment. There was a problem with.
【０００３】そこで上記製鋼ダストのリサイクルを図る
ため、集塵したダストに石炭、コ−クス粉末等の炭粉を
混合して、再度炉内に投入して、金属を回収する試みが
なされている。しかして、上記製鋼ダストと炭粉とは、
そのままでは微粉体であるため、集荷、輸送、炉内投入
等に際して、発塵を伴うため、作業環境の悪化が避けら
れない問題があった。このような問題を解決するため、
上記粉体混合物に、添加剤として、水、澱粉、ＰＶＡ等
を添加し、パン方式、ピン方式、押し出し方式及び混練
機併用方式等を使用して、造粒する方法が知られてい
た。In order to recycle the steelmaking dust, attempts have been made to recover the metal by mixing the collected dust with coal powder such as coal and coke powder, and again charging the dust in the furnace. . Then, the steelmaking dust and the carbon powder,
Since it is a fine powder as it is, it causes dust when it is collected, transported, put into the furnace, etc., and thus there is a problem that the deterioration of the working environment cannot be avoided. In order to solve such problems,
A method has been known in which water, starch, PVA or the like is added to the above powder mixture as an additive, and granulation is performed by using a pan method, a pin method, an extrusion method, a kneading machine combined method, or the like.
【０００４】しかしながら、添加剤として、澱粉、ＰＶ
Ａ等を使用する場合は、そのままでは添加できず、予め
水分、油分濃度の事前調整を必要とする難点があった。
また、水を添加して造粒する方法は、コスト的には有利
であるが、１０〜２０重量％という多量の水添加により
はじめて造粒体とすることが可能であるので、この造粒
体をそのまま炉内に投入した場合は、水分の影響で溶鋼
の温度が低下し、品質異常が生じる問題があった。それ
ばかりか、上記いずれの方法も、見掛け密度が低く、粒
度のバラツキが大きく、しかも強度の低い造粒体しか得
られないので、炉内に投入する場合に、発塵を伴い、作
業環境の悪化が避けられない問題があった。However, as additives, starch, PV
When A or the like is used, it cannot be added as it is, and there is a drawback that it is necessary to previously adjust the water content and the oil content.
Further, the method of granulating by adding water is advantageous in terms of cost, but it is possible to form a granulated body only by adding a large amount of water of 10 to 20% by weight. When the steel was put into the furnace as it was, there was a problem that the temperature of the molten steel was lowered due to the influence of moisture and abnormal quality occurred. Not only that, in any of the above methods, the apparent density is low, the variation in particle size is large, and only granules having low strength can be obtained. There was an unavoidable problem of deterioration.
【０００５】[0005]
【発明が解決しようとする課題】この発明は、このよう
な問題点を解決するためになされたものであり、製鋼ダ
ストと炭粉との混合物から、比較的強度の高い、しかも
粒度のバラツキの少ない造粒体を得ることができ、この
造粒体を使用することによって、作業環境を悪化させる
ことなく、リサイクルにより金属を回収できる造粒方法
を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it has a relatively high strength and a variation in particle size from a mixture of steelmaking dust and carbon powder. An object of the present invention is to provide a granulation method capable of obtaining a small amount of granules, and by using the granules, the metal can be recovered by recycling without deteriorating the working environment.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、本発明者等は鋭意研究の結果、製鋼ダストには、水
分と油分とが含有されているが、脂肪族炭化水素油を添
加することによって、水分は粉体から押し出され、油分
とは親和力があるので、リサイクルする工程で殆ど発塵
を伴わない比較的強度の高い、しかも粒度のバラツキの
少ない造粒体が得られることを見い出し、本発明に到達
した。[Means for Solving the Problems] In order to achieve the above object, the inventors of the present invention have earnestly studied, and as a result, steelmaking dust contains water and oil, but an aliphatic hydrocarbon oil is added. As a result, water is pushed out from the powder and has an affinity with oil, so we found that a granule with relatively high strength and little variation in particle size can be obtained with little dust generation in the recycling process. Has reached the present invention.
【０００７】即ち本発明は、電気炉を用いて製鋼する際
発生する製鋼ダストを炭粉と混合して造粒し、この造粒
体を電気炉内に投入して、金属を回収する方法に於い
て、前記製鋼ダストと炭粉との混合物に、脂肪族炭化水
素油を添加して造粒することを特徴とする。本発明に使
用する製鋼ダストは、金属及び金属酸化物のほかに、油
分及び水分を含有している。一般に、油分の含有量は、
３〜６重量％であり、水分の含有量は、５〜１０重量％
である。That is, the present invention relates to a method for recovering metal by mixing steelmaking dust generated during steelmaking using an electric furnace with carbon powder and granulating the granulated material, and charging the granulated material into the electric furnace. In the above, an aliphatic hydrocarbon oil is added to the mixture of the steelmaking dust and the carbon powder for granulation. The steelmaking dust used in the present invention contains oil and water in addition to metals and metal oxides. Generally, the oil content is
3 to 6% by weight, the water content is 5 to 10% by weight
Is.
【０００８】本発明に使用する炭粉としては、石炭、コ
−クス粉末等の炭粉が挙げられるが、特にシュレッダ−
ダストを乾留して得た炭化物を使用するのが、シュレッ
ダ−ダストを廃棄せずに再利用できることから好まし
い。このように、シュレッダ−ダストからの炭化物を製
鋼ダストと混合して造粒すると、造粒体の強度及び密度
が高くなる。これは、製鋼ダストが平均粒径１〜１０μ
ｍと非常に細かいので、数百μｍ程度の平均粒径とした
シュレッダ−ダストからの炭化物と緻密に混合するから
である。Examples of the charcoal powder used in the present invention include coal, coke powder and other charcoal powders, and especially shredders.
It is preferable to use the carbide obtained by dry distillation of the dust, since the shredder dust can be reused without being discarded. As described above, when the carbide from the shredder dust is mixed with the steelmaking dust and granulated, the strength and the density of the granulated body are increased. This is because steelmaking dust has an average particle size of 1 to 10 μm.
This is because it is very fine as m, so that it is densely mixed with carbide from shredder dust having an average particle size of about several hundreds of μm.
【０００９】シュレッダ−ダストは、廃自動車、廃家電
等をシュレッダ−処理することによって発生した廃プラ
スチックを主体とし、ガラス片、土砂等の無機物及び
銅、アルミニウム等の金属を含有している。シュレッダ
−ダスト中には、廃プラスチック分が乾燥したシュレッ
ダ−ダスト全量に対して、５０重量％程度含有され、廃
プラスチック分中には、一般には塩化ビニ−ルが含有さ
れている。シュレッダ−ダストからの炭化物は、シュレ
ッダ−ダスト中の水分を２０重量％以下、好ましくは１
０重量％以下に乾燥するか、或は水分２０重量％以下、
好ましくは１０重量％以下のシュレッダ−ダストを使用
し、ガラス片、土砂等の不燃物を篩分けした後、３００
〜５００℃で空気をほぼ遮断して乾留し、乾留残渣から
金属を除去することによって得られる。The shredder dust is mainly made of waste plastic produced by shredding waste automobiles, household appliances, etc., and contains inorganic substances such as glass fragments, earth and sand, and metals such as copper and aluminum. The shredder dust contains a waste plastic content of about 50% by weight based on the total amount of the dried shredder dust, and the waste plastic content generally contains vinyl chloride. The carbide from the shredder dust contains 20% by weight or less of water in the shredder dust, preferably 1%.
Dried to 0% by weight or less, or water 20% by weight or less,
Preferably, 10% by weight or less of shredder dust is used, and after sieving nonflammable materials such as glass pieces and earth and sand, 300
It is obtained by dry-distilling at ˜500 ° C. with almost no air cut to remove metal from the dry-distillation residue.
【００１０】製鋼ダストと炭粉との混合割合は、炭粉が
製鋼ダストの１０〜５０重量％となる割合が好ましい。
炭粉の量が少なすぎると、金属酸化物を十分還元できな
いし、多すぎても利点はない。本発明に使用する脂肪族
炭化水素油は、脂肪族炭化水素からなり、揮発性の高く
ない、常温で液体の可燃性化合物である。このようなも
のとしては、例えば、灯油、軽油または重油が好適に使
用できる。The mixing ratio of the steelmaking dust and the carbon powder is preferably such that the carbon powder constitutes 10 to 50% by weight of the steelmaking dust.
If the amount of carbon powder is too small, the metal oxide cannot be reduced sufficiently, and if it is too large, there is no advantage. The aliphatic hydrocarbon oil used in the present invention is a combustible compound which is composed of an aliphatic hydrocarbon and is not highly volatile and which is liquid at room temperature. As such a material, for example, kerosene, light oil or heavy oil can be preferably used.
【００１１】脂肪族炭化水素油の使用量は、製鋼ダスト
と炭粉との混合物の３〜１０重量％使用するのが良い。
３重量％未満では、凝集力が不足するため、見掛け密度
が低く、強度の低い造粒体しか得られないし、１０重量
％より多く使用すると、凝集力は十分であるので、見掛
け密度は高いが、脂肪族炭化水素油が多すぎるため、強
度の低い造粒体しか得られない。造粒方法自体は、公知
の方法をそのまま使用することができる。即ち、パン方
式、ピン方式、押し出し方式及び混練機併用方式等を使
用して、脂肪族炭化水素油を混合し、造粒すれば良い。The amount of the aliphatic hydrocarbon oil used is preferably 3 to 10% by weight of the mixture of steelmaking dust and carbon powder.
If it is less than 3% by weight, the cohesive force is insufficient, so that the apparent density is low and only a granule having low strength can be obtained. However, since the amount of the aliphatic hydrocarbon oil is too large, only granules having low strength can be obtained. As the granulation method itself, a known method can be used as it is. That is, the aliphatic hydrocarbon oil may be mixed and granulated using a pan method, a pin method, an extrusion method, a kneader combination method, or the like.
【００１２】[0012]
【実施例】次に、実施例、比較例を挙げて本発明を更に
説明するが、本発明はこれら実施例に限定されない。実
施例に使用した製鋼ダスト成分は、次表１に示す通りで
あった。EXAMPLES Next, the present invention will be further described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. The steelmaking dust components used in the examples are as shown in Table 1 below.
【００１３】[0013]
【表１】 [Table 1]
【００１４】実施例１〜７、比較例１及び２ 混練機中、上記表１に記載の製鋼ダスト１０重量部当た
り、２重量部の炭粉を混合し、この混合物に灯油を次表
２に記載の割合で４分間混合して、造粒体を得た。得ら
れた造粒体の見掛け密度（ｇ／ｍ3）と強度（ｋｇ／ｃ
ｍ）とを測定した。結果を次表２に示す。尚、比較のた
め、灯油の代わりに水を次表２に記載の割合で混合する
以外は、同様にして造粒し、見掛け密度（ｇ／ｍ3）と
強度（ｋｇ／ｃｍ）とを測定し、結果を次表２に併記し
た。強度（ｋｇ／直径）は、造粒体の耐圧力（ｋｇ）を
測定し、この値を直径（ｃｍ）で割った値で表した。Examples 1 to 7, Comparative Examples 1 and 2 In a kneader, 2 parts by weight of carbon powder was mixed with 10 parts by weight of the steelmaking dust described in Table 1 above, and the mixture was mixed with kerosene as shown in Table 2 below. The mixture was mixed for 4 minutes at the stated ratio to obtain a granulated body. Apparent density (g / m 3 ) and strength (kg / c) of the obtained granules
m) and were measured. The results are shown in Table 2 below. For comparison, the apparent density (g / m 3 ) and the strength (kg / cm) were measured in the same manner except that water was mixed in the ratio shown in Table 2 below instead of kerosene. The results are shown in Table 2 below. The strength (kg / diameter) was represented by the value obtained by measuring the pressure resistance (kg) of the granulated body and dividing this value by the diameter (cm).
【００１５】[0015]
【表２】 [Table 2]
【００１６】上記表２の結果から明らかなように、従来
の水の代わりに灯油を添加することによって、見掛け密
度の高い造粒体が得られる。また、灯油の使用量を、
３．０〜１０重量％とすることによって、強度の高い造
粒体が得られる。 実施例８、比較例３ 混練機中、上記表１に記載の製鋼ダスト１０重量部当た
り、２重量部の炭粉を混合し、この混合物にＡ重油を
５．０重量％添加し、上記実施例と同様にして、造粒体
を得た。得られた造粒体の粒度分布を測定し、結果を図
１にグラフで示した。尚、比較のため、Ａ重油の代わり
に水を１５．０重量％添加する以外は、同様にして造粒
体とし、この造粒体の粒度分布を測定した。結果を図２
にグラフで示した。。図１及び図２から、従来法で得た
造粒体は、粒度分布のバラツキが大きいが、本発明方法
で得た造粒体は、粒度分布のバラツキが少ないこと明ら
かである。As is clear from the results in Table 2 above, by adding kerosene in place of conventional water, granules having a high apparent density can be obtained. Also, the amount of kerosene used
By setting the content to 3.0 to 10% by weight, a granulated product having high strength can be obtained. Example 8 and Comparative Example 3 In a kneader, 2 parts by weight of carbon powder was mixed with 10 parts by weight of the steelmaking dust described in Table 1 above, and 5.0% by weight of A heavy oil was added to the mixture, and the above-mentioned operation was performed. A granule was obtained in the same manner as in the example. The particle size distribution of the obtained granules was measured, and the results are shown in the graph in FIG. For comparison, a granulated product was prepared in the same manner except that 15.0% by weight of water was added instead of the heavy oil A, and the particle size distribution of this granulated product was measured. The result is shown in Figure 2.
Is shown in the graph. . From FIGS. 1 and 2, it is clear that the granules obtained by the conventional method have a large variation in particle size distribution, but the granules obtained by the method of the present invention have a small variation in particle size distribution.
【００１７】実施例９ 造粒体成分として、次表３に記載の成分を使用し、灯油
を次表３に記載の割合で混合する以外は、実施例１〜７
と同様にして造粒体を得た。得られた造粒体の見掛け密
度（ｇ／ｍ3）と強度（ｋｇ／ｃｍ）とを測定し、結果
を次表３に併記した。使用した製鋼ダストの平均粒径は
３μｍ、炭粉の平均粒径は２５μｍ、シュレッダ−ダス
トからの炭化物の平均粒径は３７０μｍであった。尚、
シュレッダ−ダストからの炭化物は、水分３５重量％の
シュレッダ−ダスト中の水分を１０重量％に乾燥し、ガ
ラス片、土砂等の不燃物を篩分けした後、３００〜５０
０℃で空気をほぼ遮断して乾留し、乾留残渣から金属を
除去した後、粉砕したものを使用した。Example 9 Examples 1 to 7 except that the ingredients shown in Table 3 below were used as the granule ingredients and kerosene was mixed in the proportions shown in Table 3 below.
A granule was obtained in the same manner as in. The apparent density (g / m 3 ) and strength (kg / cm) of the obtained granules were measured, and the results are shown in Table 3 below. The average particle size of the steelmaking dust used was 3 μm, the average particle size of the carbon powder was 25 μm, and the average particle size of the carbide from the shredder dust was 370 μm. still,
The carbide from the shredder dust is dried at a water content of 35% by weight in the shredder dust to 10% by weight, and is screened for incombustible materials such as glass pieces and earth and sand.
At 0 ° C., the air was almost cut off and the material was dry-distilled to remove the metal from the dry-distillation residue, and then pulverized.
【００１８】[0018]
【表３】 [Table 3]
【００１９】[0019]
【作用】本発明方法では、バインダ−として、脂肪族炭
化水素油を使用するので、製鋼ダスト中の水分を追い出
し、油分とは強い親和力で混合するから、粉体を強く凝
集させるので、粉体粒子が相互に安定し、見掛け密度が
高く、安定した粒度分布の比較的強度の高い造粒体が得
られるものと考えられる。また、脂肪族炭化水素油を使
用するため、炉内リサイクルの反応時に昇熱効果が得ら
れる。In the method of the present invention, since the aliphatic hydrocarbon oil is used as the binder, the moisture in the steelmaking dust is expelled and mixed with the oil component with a strong affinity, so that the powder is strongly aggregated. It is considered that the granules having mutually stable particles, high apparent density, and stable particle size distribution and relatively high strength can be obtained. Further, since the aliphatic hydrocarbon oil is used, the heating effect can be obtained during the reaction of recycling in the furnace.
【００２０】[0020]
【効果】以上述べたごとく、本発明方法によれば、見掛
け密度が高く、安定した粒度分布の比較的強度の高い造
粒体が得られるので、炉内投入に際し、殆ど発塵を伴わ
ないから、作業環境を悪化させることなく、製鋼ダスト
をリサイクルして、金属を回収することができ、従来廃
棄処分されていた製鋼ダストの有効利用が支障なく達成
される。また、バインダ−として、脂肪族炭化水素油を
使用するため、炉内リサイクルの反応時に昇熱効果が得
られるから、製鋼ダストを効果的に還元して、金属を回
収することができる。[Effect] As described above, according to the method of the present invention, since a granulated product having a high apparent density and a stable particle size distribution and a relatively high strength can be obtained, dust is hardly generated when charged into the furnace. The metallurgical dust can be recycled and the metal can be recovered without deteriorating the working environment, and the steel dust that has been conventionally disposed of can be effectively used without any trouble. Further, since the aliphatic hydrocarbon oil is used as the binder, the heating effect can be obtained during the reaction of recycling in the furnace, so that the steelmaking dust can be effectively reduced and the metal can be recovered.
【００２１】[0021]
【図１】本発明方法で得た造粒体の粒度分布の測定結果
を示すグラフである。FIG. 1 is a graph showing the measurement results of the particle size distribution of granules obtained by the method of the present invention.
【図２】従来法で得た造粒体の粒度分布の測定結果を示
すグラフである。FIG. 2 is a graph showing the measurement results of particle size distribution of a granulated body obtained by a conventional method.
Claims (6)
ストを炭粉と混合して造粒し、この造粒体を電気炉内に
投入して、金属を回収する方法に於いて、前記製鋼ダス
トと炭粉との混合物に、脂肪族炭化水素油を添加して造
粒することを特徴とする製鋼ダストの造粒方法。1. A method for recovering metal by mixing steelmaking dust generated during steelmaking in an electric furnace with carbon powder and granulating the granulated material, and then introducing the granulated material into the electric furnace to recover metal. A granulation method of steelmaking dust, characterized in that an aliphatic hydrocarbon oil is added to the mixture of the steelmaking dust and carbon powder for granulation.
て得た炭化物である請求項１に記載の造粒方法。2. The granulation method according to claim 1, wherein the carbon powder is a carbide obtained by dry distillation of shredder dust.
と炭粉との混合物に対し、３〜１０重量％添加してなる
請求項１に記載の造粒方法。3. The granulation method according to claim 1, wherein the aliphatic hydrocarbon oil is added in an amount of 3 to 10% by weight with respect to the mixture of the steelmaking dust and the carbon powder.
は重油の単独若しくは混合物である請求項１に記載の造
粒方法。4. The granulation method according to claim 1, wherein the aliphatic hydrocarbon oil is kerosene, light oil or heavy oil, either alone or in a mixture.
％含有させてなる請求項１に記載の造粒方法。5. The granulation method according to claim 1, wherein the steelmaking dust is contained in an amount of 10 to 50% by weight of carbon powder.
６重量％であり、水分の含有量が、５〜１０重量％であ
る請求項１に記載の造粒方法。6. The content of oil in the steelmaking dust is 3 to.
The granulation method according to claim 1, wherein the granulation method is 6% by weight and the water content is 5 to 10% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16315095A JPH08323327A (en) | 1995-03-27 | 1995-06-07 | Method for granulating steelmaking dust |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9199395 | 1995-03-27 | ||
| JP7-91993 | 1995-03-27 | ||
| JP16315095A JPH08323327A (en) | 1995-03-27 | 1995-06-07 | Method for granulating steelmaking dust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08323327A true JPH08323327A (en) | 1996-12-10 |
Family
ID=26433423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16315095A Pending JPH08323327A (en) | 1995-03-27 | 1995-06-07 | Method for granulating steelmaking dust |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08323327A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013136800A (en) * | 2011-12-28 | 2013-07-11 | Jfe Steel Corp | Aggregating method and recycling method for shredder dust |
-
1995
- 1995-06-07 JP JP16315095A patent/JPH08323327A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013136800A (en) * | 2011-12-28 | 2013-07-11 | Jfe Steel Corp | Aggregating method and recycling method for shredder dust |
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