１．論文題名／要約

１．６．廃棄物

An Advanced Technique for Leaching Test of Mo and Sb in Polluted Soil

Laboratory leaching test which generate leachate from waste and soil have been used to evaluated leachability of hazardous constituents. The development of standardized leaching tests is needed to facilitate regulatory procedures, rout〜he waste analysis, and inter laboratory comparison of results. The purpose of this research is to present noble techniques in leaching method of items Requiring Surveillance in Japan in polluted soil, examining constituents of leachate, dilution effect of soil matrix, and effect of pH in leaching trace metal molybdenum (Mo), antimony (Sb) and nickel Ni) were studied. These results differ from those of heavy metals which were informed from variable leaching test. From these results, characteristics of soil and pH value in leaching extraction are very important in leaching test. And it is also important to select extracting condition and leaching test corresponding the purpose of leaching test.

Polymer Decomposition for Plastic Recycling

　ポリエチレン等汎用プラスチックの熱分解を行い、その速度論的評価を行った。連続分布速度論は分子量が広範囲に分布する混合物質の反応を速度論的に評価するための新しい実用的手法である。本発表では、ラジカルの生成、分解、再結合などの単純化した反応スキームに対して速度式を立て、分解反応時の分子量分布の経時変化から速度論パラメーターを求める新たな数学的手法を考案し、発表した。この方法は種々の反応装置で行う各種のプラスチックの分解反応の速度論的評価に適用でき、反応条件の最適化に利用できる｡

Resource recycling by particle shape separation

A suitable separation technique was applied for the various kinds of waste. However, it is sometimes difficult to crush and separate the waste, especially pulverize a composite waste and liberate individual materials.

In this paper, a size reducing technique for printed wiring boards and a particle shape separator for the size reduced mixture is diccussed. Using the same separator, it was possible to separate ceramic beads from waste foundry sands and the result are also shown.

Segregation or Demixing of Solid Particles on Inclined Vibrated Plates

Sometimes it is difficult to keep the position of vibrating conveyor having a transport surface being fixed horizontally or at a certain angle in respect to the horizon as desired. Even a slight inclination can cause a serious segregation of particulate solids forming heterodisperse medium, that may have negative effects on the subsequent processes. However this phenomenon, when used advantageously, can be applied to the separation according to the characteristics involved. In this study, for horizontal vibrational conveying process the optimal operating parameters have been estimated and deviated trajectories in the case of transport plane being inclines slightly rectangular to the transport direction have been simulated. Effects of the inclination angle as well as of frictional coefficient between the transported particle and the vibrated plate have been investigated. As the measure of segregation, characteristics of deviation cures have been chosen.

Using inclined vibrated plate, a separation of Al₂O₃ granule has been carried out, in order to investigate die correlation between 2D image of particles and their frictional properties.