著者

三上 博史 周 伝久 高橋 千一郎 佐藤 忠夫 嶋影 和宜

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.110, no.4, pp.313-318, 1994

被引用文献数

2

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Vanadium diboride (VB<SUB>2</SUB>) film has been synthesized on mild steel and transparent quartz substrates by CVD method, which was carried out at the temperature range of 1073 to 1223K with the hydrogen reduction of VOCl<SUB>3</SUB>-BCl<SUB>3</SUB> mixture under the chemical erquivalent ratio regions of 10 to 40 for H<SUB>2</SUB>-VOCl<SUB>3</SUB> gases and of 40 to 120 for H<SUB>2</SUB>-BCl<SUB>3</SUB> gases. VB<SUB>2</SUB> film involving both Fe<SUB>2</SUB>B and FeB was synthesized on a mild steel substrate because a mild steel plate was borided with BCl<SUB>3</SUB> gas. On the other hand, pure VB<SUB>2</SUB> layer film was prepared on a transparent quartz substrate atthe temperature above 1173K. Futhermore, VB<SUB>2</SUB> film having high orientation and crystallization could not be prepared on a mild steel substrate. However, smooth surface VB<SUB>2</SUB> film having high crystallization and micro-vickers hardness of about 2800Hmv could be synthesized on a transparent quartz substrate at the temperature of 1173K under the conditions of chemical equivalent ratio of 40 for H<SUB>2</SUB>-VOCl<SUB>3</SUB> gases and of 80 for H<SUB>2</SUB>-BCl<SUB>3</SUB> gases.

著者

作田 庸一 嶋影 和宜

出版者

The Mining and Materials Processing Institute of Japan

雑誌

資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan (ISSN:09161740)

巻号頁・発行日

vol.120, no.2, pp.71-77, 2004-02-25

被引用文献数

1 2

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A large amount of marine organic residue is generated and wasted from scallop shell processing manufacture. Because the waste product of scallop, especially the mid-gut gland contains a large quantity of heavy metals such as cadmium and copper, it cannot be effectively used. Now, a large part of these wastes are treated in landfills. However, in recent, the landfill treatment runs into trouble because of an environmental pollution and a decrease in proposed landfill ground. Consequently, the development of a new treatment method of the scallop waste is really required. In order to recycle the organic residue of scallop mid-gut gland, a new technology has been developed for removing the harmful cadmium and using as fish meal and fertilizer.<BR>This treatment consists of a cadmium leaching process from the mid-gut gland in a sulfuric acid solution and a cadmium electro-deposition process. This new treatment technology corresponding to hydrometallurgical process can remove more than 95% of cadmium from the mid-gut gland. At first, influences of various factors on cadmium removal efficiency such as acid concentration, electrolytic voltage, anode materials and so on, were examined to decide the most suitable conditions of an electrochemical treatment method by using a small scale plant test.<BR>And secondarily, a demonstration plant to enable one batch treatment of about 100kg/day was designed on the basis of the results of a fundamental experiment, and a prototype plant was built. Finally, a demonstration test was conducted.<BR>The dried and crushed wastes products of scallop after the removal of cadmium were reused as a feed and fertilizer materials, and in the year 2000, two recycle plants of the scallop waste on the basis of this development research were constructed at Oshamanbe-cho and Sawara-cho in Hokkaido, and now under operating.

著者

作田 庸一 嶋影 和宜

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.120, no.2, pp.71-77, 2004 (Released:2006-04-13)

参考文献数

32

被引用文献数

2

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A large amount of marine organic residue is generated and wasted from scallop shell processing manufacture. Because the waste product of scallop, especially the mid-gut gland contains a large quantity of heavy metals such as cadmium and copper, it cannot be effectively used. Now, a large part of these wastes are treated in landfills. However, in recent, the landfill treatment runs into trouble because of an environmental pollution and a decrease in proposed landfill ground. Consequently, the development of a new treatment method of the scallop waste is really required. In order to recycle the organic residue of scallop mid-gut gland, a new technology has been developed for removing the harmful cadmium and using as fish meal and fertilizer.This treatment consists of a cadmium leaching process from the mid-gut gland in a sulfuric acid solution and a cadmium electro-deposition process. This new treatment technology corresponding to hydrometallurgical process can remove more than 95% of cadmium from the mid-gut gland. At first, influences of various factors on cadmium removal efficiency such as acid concentration, electrolytic voltage, anode materials and so on, were examined to decide the most suitable conditions of an electrochemical treatment method by using a small scale plant test.And secondarily, a demonstration plant to enable one batch treatment of about 100kg/day was designed on the basis of the results of a fundamental experiment, and a prototype plant was built. Finally, a demonstration test was conducted.The dried and crushed wastes products of scallop after the removal of cadmium were reused as a feed and fertilizer materials, and in the year 2000, two recycle plants of the scallop waste on the basis of this development research were constructed at Oshamanbe-cho and Sawara-cho in Hokkaido, and now under operating.