Clarifying liberation mechanism of electrical disintegration by electromagnetic field analysis

Rintaro Hayashi*, Shuji Owada

*この研究の対応する著者

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

The enrichment of useful components from ores and/or wastes has become important with increasing recent worldwide resources demand and the amount of wastes generated from the urban mines, in order to establish real "sound resource-cycle society" including the activity of resource exploitation. The first stage of the treatment in the process must be comminution and it is important to make good liberation among compositional phases in the targeted resources. Electrical disintegration (ED) is well known to make a selective breakage at phase boundary. However, the detailed mechanism of the phenomena is not clarified yet, in especial, on the influence of electrical properties of compositional materials on the liberation. This paper made a comparison between the liberation degrees of ED products and the results of electromagnetic field analysis using finite element method (FEM). In the experiments, we used several synthetic cement paste based samples in which mineral particles were dispersed to apply the ED, and in the electromagnetic field analysis, we calculated the charge density accumulated and the Maxwell stress at phase boundary. It was found, for highly insulating mineral samples, that higher breakdown voltage was necessary because electric charge was not easily accumulated at phase boundary but that higher liberation degree was obtained after the breakdown (ED). It was also found the tendency that higher liberation was observed for the samples which had higher maximum Maxwell stress calculated by the electromagnetic field analysis. From the results, the electrical charge and Maxwell stress induced at phase boundary could be driving forces of selective breakage. In addition, we also applied the ED to the printed circuit boards (PCBs) in order to concentrate miner rare metals, which were essential for producing electronic devices. It could be demonstrated that the devices installed on the PCB were easily detached from the board and that most of metal elements in the devices was exposed and liberated from the insulating plastic covers, which were broken in the ED, then, it is considered that the subsequent solid phase separation could be effective for concentrating such metal elements.

本文言語English
ホスト出版物のタイトル26th International Mineral Processing Congress, IMPC 2012
ホスト出版物のサブタイトルInnovative Processing for Sustainable Growth - Conference Proceedings
ページ1951-1961
ページ数11
出版ステータスPublished - 2012 12 1
イベント26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - New Delhi, India
継続期間: 2012 9 242012 9 28

出版物シリーズ

名前26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings

Conference

Conference26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth
国/地域India
CityNew Delhi
Period12/9/2412/9/28

ASJC Scopus subject areas

  • 地球化学および岩石学
  • 地盤工学および土木地質学

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