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全文: "スクラップ"
5,428件中 1-20の結果を表示しています
  • 大中 一徳, 森 広司
    電気製鋼
    2001年 72 巻 1 号 21
    発行日: 2001年
    公開日: 2001/03/01
    ジャーナル フリー
    Scrap pre-heating technology by the rotary kiln was investigated as a research activity of Japanese national project "Shinseiko Process Forum" in order to develop the highly energy efficient scrap melting process for a total scrap recycling system. Main achievements were as follows;
  • 岩井 確, 山口 国男, 杉浦 三朗, 斉藤 泰郎, 稲垣 佳夫
    電気製鋼
    1981年 52 巻 4 号 219-227
    発行日: 1981/11/15
    公開日: 2009/05/25
    ジャーナル フリー
    0.25ton scrap preheater was prepared for experimental study on a utilization of the waste gas being exhausted from electric arc furnace. This paper deals with the effects of gas temperature, the kind of scrap and fill ratio etc. on the heat efficiency of scrap preheating.
    The results obtained in the present experiment showed good agreements with the practical data of 10ton scrap preheater.
  • 塚本 洋三, 廣田 美枝, 平岡 考, 吉田 成, 鶴見 みや古
    山階鳥類学雑誌
    2012年 43 巻 2 号 222-241
    発行日: 2012/03/30
    公開日: 2014/03/30
    ジャーナル フリー
    The authors have reported on the Cataloging and Photographic Conservation of the Yamashina Institute for Ornithology Collection of Kenji Shimomura in this journal (Tsukamoto et al. 2010). Subsequently, additional material originating from Kenji Shimomura was found and was treated in the same manner as described in the original report. Thus, 678 items (AVSK_MS_0919–1580 and AVSK_OT_0418–0433) were added, increasing the entire collection to a total of 11,982 items. The additional OT data (original drawings by Shimomura) is shown in Appendix 1, and the MS data in Appendix 2.
  • 納富 義宝, 野田 俊, 藤川 昌資
    鋳造工学 全国講演大会講演概要集
    2001年 138 巻 13
    発行日: 2001年
    公開日: 2020/04/01
    会議録・要旨集 フリー
  • 小口 正弘, 寺園 淳, 長谷川 亮
    廃棄物資源循環学会研究発表会講演集
    2014年 25 巻 E3-2
    発行日: 2014年
    公開日: 2014/12/16
    会議録・要旨集 フリー
    金属スクラップ(雑品)はそのほとんどが鉄スクラップとして輸出されているが,使用済み電気電子機器等を含むなど有害物質管理の観点からその問題が指摘されている。本研究では,金属スクラップに係る有害物質管理促進に資する知見を得るため,スクラップ業者から実際の金属スクラップ約10トンを調達し,その組成調査を行うとともに複数の方法を用いて有害特性分析のためのサンプリングを試行した。調達した金属スクラップ試料は4割程度を家電製品やOA機器が占めており,それらの機器に由来する有害物質の混入が疑われた。現行の分析ではケーブルやモーターを試料とすることが多いが,調査したスクラップ試料には鉛やアンチモンが含有・溶出基準を超過した基板やプラスチックくず,10cm以下の小片物が多く含まれており,現行の目視ピックアップによるサンプリングだけでは金属スクラップの有害特性を適切に把握できていない可能性が示唆された。
  • 中島 謙一, 原田 幸明, 林 誠一
    鉄と鋼
    2005年 91 巻 1 号 154-158
    発行日: 2005/01/01
    公開日: 2009/06/19
    ジャーナル フリー
    今回の研究により以下の成果が得られた。
    ・産業連関表を利用した新しい鉄加工スクラップ量の推計方法開発した。
    ・発生部門別の鉄加工スクラップ量データベースを構築した。
    さらに,本手法による結果より,業界で行っている鉄加工スクラップ発生率実態調査の再検討が必要であることが明らかとなった。本研究は,継続中であり,スクラップ業者等へのヒアリングを現在も行っている。今後は,これらの調査をもとに,推計したスクラップ価格の検討を行う。また,今回の推計では,1部門から発生するスクラップは1銘柄と仮定して分析を実施した。今後は,部門内のスクラップ銘柄の分割の検討を行う。
  • 中島 謙一, 玉城 わかな, 藤巻 大輔, 醍醐 市朗
    鉄と鋼
    2005年 91 巻 1 号 150-153
    発行日: 2005/01/01
    公開日: 2009/06/19
    ジャーナル フリー
    An effective utilization of scraps has been required for a establishing a sound material-cycle society. In order to understand the supply and demand system of the scrap at the present time, it is necessary to know the detail and precise scrap flow. For this purpose, the present study aims a material flow analysis for the iron and steel scraps. Since the iron and steel are the most typical base-materials for the society, it has been believed that we have enough amount of statistical information on their scrap markets. It is found by the present study, however, that the domestic circulation figure for iron and steel scrap was hard to be drawn due to mainly the discrepancy of the definition of each scrap category between the supplier and the user. Such discrepancy results in the following three major problems; (1) discontinuity of the scrap flow, (2) mismatching of the categories of supplied and used scraps, and (3) the lack of the data about un-collective scrap.
  • 森 一美, 野村 宏之
    鉄と鋼
    1969年 55 巻 5 号 347-354
    発行日: 1969/04/01
    公開日: 2010/10/12
    ジャーナル フリー
    A mathematical model has been developed for scrap melting in the steelmaking process based on the concept of simultaneous heat and mass transfer. Steady state equations are established for heat and mass transfer in the boundary layer between solid and liquid. Heat conduction in the solid is expressed by an unsteady state equation. The thickness of diffusion layer and the thickness of scrap are chosen as the required parameters for the calculation. Numerical solutions are obtained by the finite difference method.
    The calculation using the values of diffusion layer thickness (5×10-3-10-2cm) found by the authors indicates that the present model gives a general agreement with practical data in the case of simple form of scrap.
    It is predicted that scrap form and size have an effect on the rate-determining mechanism of scrap melting and on the duration of transient heat conduction in the solid scrap. This is considered to be important in the performance of dynamic control.
    It is thought that at the beginning of the process when the temperature of the bath is low and the bath turbulence is weak, iron would solidify on the cold scrap.
    A limit of size of scrap for the rapid refining are also discussed.
  • 玉城 わかな, 五十嵐 佑馬, 藤巻 大輔, 林 誠一, 友田 陽, 松野 泰也, 長坂 徹也
    鉄と鋼
    2006年 92 巻 5 号 340-345
    発行日: 2006/05/01
    公開日: 2009/06/19
    ジャーナル フリー
    1.91 milliont of steel scrap was exported from Japan to Korea in 2003, which accounted for more than 30% of the total steel scrap exported to other countries from Japan. Change in steel scrap demand in Korea in the future will make a great influence on the amount of Japan's steel scrap domestic consumption and export. In this work, quantitative data about the steel production, steel scrap demand and consumption during 1977-2003 in Korea were collected to analyze the amounts of inhouse, industrial and obsolete scrap generation, and total steel accumulation in Korea. Then, the steel scrap demand in Korea in the future was estimated. The total accumulation of steel in Korea was estimated as 380 million t in 2003 and 548 million t in 2010, respectively. The amount of obsolete scrap generation in Korea was 7.1 million t in 1996 and 9.0 million t in 2003, which was about 3.0% and 2.4% of the total steel accumulation in each year. Supposing that the amount of crude steel production, scrap consumption percentages in B.O.F and E.A.F will be stable, the obsolete scrap generation in Korea in 2010 were estimated as 13-17 million t. This significant increase in obsolete scrap generation in Korea could exceed the current amount of the scrap import. So, self-sufficiency of steel scrap could be achieved in around 2010 in Korea.
  • 中江 秀雄
    鋳造工学 全国講演大会講演概要集
    1999年 135 巻 O-5
    発行日: 1999年
    公開日: 2020/07/05
    会議録・要旨集 フリー
  • 高松 信彦, 米澤 公敏, 上野 博則, 玉城 わかな, 林 誠一
    鉄と鋼
    2014年 100 巻 6 号 740-749
    発行日: 2014年
    公開日: 2014/05/31
    ジャーナル オープンアクセス HTML
    In recent years, while comparing materials has been actively performed by utilizing LCA, in consideration of the lifecycle of a material, recycling is an important factor that influences the overall lifecycle of the materials. However, there is little material of which statistical data in the recycling industry, in other words the venous industry, is arranged. In addition, a definition of the recycling and an amount of material being recycled are different for each material and further, even though it is the same material, the definition of the recycling and the amount of material being recycled are greatly different depending on publicized reports.
    Among the materials, qualitatively, steel material is said to have high recycling performance but there is not much statistical data regarding recycling thereof. Thus, it is often to indicate a quantitative recycling rate as Recycled Content (a ratio of using steel scrap). However, the Recycled Content of steel manufacturing in Japan is as low as 30%, in accordance with a recent increase in steel consumption, which gives an impression departing from the original meaning of qualitatively “high recycling performance”.
    Based on the above background, we have collected the quantitative data regarding steel manufacturing for each country of the world and estimated world steel stock (accumulated) in 2008 using the collected data in consideration of a loss or the like in the steel making process. As a result of the estimation, the world steel stock (accumulated) in 2008 was 22 billion tons including the amount of loss. This amount was converted into an amount in terms of Fe and it was estimated that there was 20.8 billion tons excluding the amount of loss. In this review, the recycling rate is considered to be an obsolete scrap recovery ratio and the idea and the estimation method are presented. As a result of collecting data for a long period of time, verifying data and examining the inspection method, material balance of the steel is confirmed and a world steel recycling circuit can be created.
  • 小田 隆史, 醍醐 市朗, 松野 泰也, 足立 芳寛
    鉄と鋼
    2009年 95 巻 10 号 720-729
    発行日: 2009/10/01
    公開日: 2009/12/10
    ジャーナル オープンアクセス
    Previous studies pointed out that some ferritic stainless steel scrap is mixed in carbon steel scrap and chromium is accumulated in carbon steel product. This paper analyzed Japanese substance flows of chromium involved in stainless steel, other alloy steel and carbon steel by using a dynamic modeling. Those substance flows covered 97% of chromium consumption in Japan. To classify different kind of alloys, stainless steel is subdivided into 13Cr, 18Cr, Cr–Ni, and Cr–Ni–Mo. Heat-resistant steel, structural alloy steel, bearing steel, and spring steel are also taken into account as steel alloys including chromium. Carbon steel is classified into BOF (basic oxygen furnace) carbon steel and EAF (electric arc furnace) carbon steel due to difference of raw materials. It was found that in-use stock of chromium as stainless steel and other alloy steel were 3.4 Tg and 0.7 Tg in 2005, respectively. Other chromium stock as an alloying element in carbon steel was estimated as 0.7 Tg in 2005, which is dissipated into the carbon steel cycle. From the results of the dynamic model, rates of ferritic stainless steel and other alloy steel recovered as carbon steel were approximately 40% and 80% in 2005, respectively. Chromium accumulation in EAF carbon steel was dynamically analyzed from 1990 to 2030. Based on an assumption that future steel demand is same to the current demand, it was predicted that the average chromium content in EAF carbon steel would gradually increase and reach to 0.24% in the year 2030.
  • 岸田 壽夫, 浅野 重雄, 鵜飼 敦, 杉浦 三朗
    電気製鋼
    1983年 54 巻 1 号 31-42
    発行日: 1983/01/31
    公開日: 2009/06/16
    ジャーナル フリー
    Based on the test results with a miniature preheater of 0.25ton capacity and measurements of temperature and volume of exhaust gas from a 25 ton electric arc furnace, a commercial scale scrap preheater was designed and installed to utilize exhaust gas from a 25 ton arc furnace. In the commercial operation of the installed preheater the following operation results were achieved after several improvements;
    Item Reduction
    Tap to tap time 8 min/heat
    Power consumption 50kWh/ch·t
    Electrode consumption 0.7kg/ch·t
    Refractory consumption 17%
    Production cost 670yen/ch·t
  • 浅井 滋生, 鞭 巌
    鉄と鋼
    1970年 56 巻 5 号 546-557
    発行日: 1970/04/01
    公開日: 2010/10/12
    ジャーナル フリー
    A mathematical model for determining the variations of a temperature of molten steel, tm and a concentration of carbon in steel bath, Cm caused by the melting of scamp fed into LD converter is developed in this work.
    Experimental data obtained by others in the blowing process of LD converter were plotted on the figure of Cm vs. tm. It was noted from this figure that there were considerable differences between the data for the case where scrap had not been fed into converter and those with feed of scrap, and that the data obtained where all of scrap had not yet been molten indicated the variation of Cm with tm along a liquidus line of the iron-carbon phase diagram in accordance with the progress of the blowing time.
    Behaviors of Cm and tm accompanied by the fluctuations of these process variables caused by the changes of operating conditions were analysed in terms of the model mentioned above. And, on the basis of these behaviors, a method of a end-point dynamic control with the aid of a topological phase diagram was proposed in this paper.
  • 小澤 純夫, 月橋 文孝
    鉄と鋼
    2009年 95 巻 10 号 704-709
    発行日: 2009/10/01
    公開日: 2009/12/10
    ジャーナル オープンアクセス
    Steel is produced from either primary iron (iron ore), secondary iron (scrap) or a mixture of both. The Utility of Stock hypothesis, which assumes that the in-use stock of constructional material is a function of GDP, was formulated and the clear correlation between the world steel stock and the GDP led to the estimation that the world demand for primary iron (iron ore) depends not on the volume of GDP but on the variation of GDP, as already reported. In this study, the world consumption of scrap (secondary iron) is computed, and the relationship between the crude steel production and the flow of primary and secondary iron is analyzed. It becomes clear that the flow of primary iron has the controlling effect on the world production of crude steel.
  • 玉城 わかな, 五十嵐 佑馬, 藤巻 大輔, 林 誠一, 友田 陽, 松野 泰也, 長坂 徹也
    鉄と鋼
    2006年 92 巻 5 号 334-339
    発行日: 2006/05/01
    公開日: 2009/06/19
    ジャーナル フリー
    Quantitative data on development of steel production in China were collected and examined to estimate the scrap demand in 2010. Taking several influential factors into consideration, it is speculated the amount of scrap increase from 2003 is 15 million tons. This will be covered by in-house scrap, suggesting little increase of scrap import. Moreover, the scrap will used mainly for basic oxygen converter and hence high quality scrap will be requested.
  • 大久保 正男, 熊井 真次, 上田 健次
    Journal of MMIJ
    2007年 123 巻 12 号 850-854
    発行日: 2007/12/25
    公開日: 2010/12/17
    ジャーナル フリー
    Wrought aluminum alloys represent more than 50% of domestic use of aluminum, but their recycling system has not been established except for used beverage cans. This study shows that the current recycling ratio of wrought aluminum alloys scrap to wrought aluminum alloys is estimated to be 23.8%, and expected to be increased to 34%.
  • 殿谷 三郎, 植沢 吉恒, 長谷川 喜一, 高橋 秋水
    討論会講演要旨
    1974年 24 巻 37-40
    発行日: 1974年
    公開日: 2012/08/20
    ジャーナル フリー
  • 寺園 淳, 小口 正弘, 佐野 翔一, 不破 敦
    廃棄物資源循環学会研究発表会講演集
    2018年 29 巻 A9-2
    発行日: 2018年
    公開日: 2018/12/03
    会議録・要旨集 フリー
    有害性や資源性を有する廃棄物の越境移動に関して、国際的にバーゼル条約や各国の関連法で規制がなされてきた。近年は電気電子機器廃棄物の越境移動防止の取組みに関心が集まっていたことに加えて、循環資源の輸入大国であった中国において2017年以降に輸入規制の強化が相次いで発表されたことで世界に大きな影響を与えている。一方、国内においては、2017年における廃棄物処理法及びバーゼル法の改正によって、鉛バッテリーや雑品スクラップなどの不適正な輸出の防止ととともに、電子部品スクラップなどの循環資源の輸入手続き緩和が行われることになった。本事例研究では、鉛バッテリーを含む電池スクラップ、及び電子部品スクラップを事例として、国内や海外の現状を理解する基礎データを得るとともに、トレーサビリティの確保を含む国内対策の効果や課題を把握することを目的として、越境移動量の把握方法や管理のあり方を検討する。
  • 林 誠一, 玉城 わかな, 友田 陽
    鉄と鋼
    2005年 91 巻 1 号 147-149
    発行日: 2005/01/01
    公開日: 2009/06/19
    ジャーナル フリー
    In this study, sources of steel scraps for electric furnace steel products were investigated as fundamental data for studies aiming at improvement of recycling of steel.
    The amounts of steel scraps generated in 2001 were divided into heavy scrap processed by guillotine (58.7%), shredded scrap (7.2%), pressed scrap (3.4%), koudarai scrap (6.9%), shindachi scrap (17.6%) and others (6.2%). Then, the mixing ratios of various kinds of steel scrap and pig iron for raw materials of electric furnace (EF) were estimated. It was found that the mixing ratio of the steel scraps was dependent on steel products, and hence different in three groups ; family EF companies of blast furnace (BF) steel makers, mild steel EF makers and special steel EF makers. For example, the BF family companies produced mild steel (21.6%) and special steels (78.4%) by employing the mixing of 42.2% inhouse scrap, 15.3% heavy scrap, 19.8% shindachi scrap, 7.4% koudarai scrap and 1.3% pig iron for the raw material.
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