| 研究実績の概要 |
In this study, we focused on the recovery of metals from incinerator ash. In order to evaluate the possibility of metal recovery, air-dried bottom ash samples were collected from three incinerators in Japan. Large non-combustibles (metals, glass, stones, etc.) were manually removed from the bottom ash samples, and the remaining residue was divided into five particle size fractions using 4mm, 2mm, 1mm, and 0.5mm sieves, and multiple analyses were performed on each fraction. The experimental techniques used were X-ray fluorescence (XRF) analysis, X-ray diffraction (XRF) analysis, optical microscopy, scanning electron microscopy, and standard leaching tests for each fraction to identify the various phases of the incinerator bottom ash in each fraction and understand its physical and chemical properties. Dust ash contains a higher percentage of lead, zinc, and copper than the main ash. Hence, it was considered advisable to separate and recover dust ash for the recovery of these three metals. However, given the small percentage of dust ash generated, it was considered more profitable to recover lead from the separated dust ash and recover zinc and copper from incinerated ash (dust ash and main ash) without separating and recovering the dust ash.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
At present, we are conducting the following experimental analysis:
1) Separation of a group of bottom ash samples recently collected from an incinerator using sieve analysis. 2) Bulk mineralogical and chemical characterization of the samples above using XRD and XRF techniques, respectively. 3) Analyzing the leaching behavior of each element using standard leaching experiments and ICP-OES analysis. 4) Microscopic observation and microanalytical characterization of metal-bearing phases in incarnation bottom ash products. 5) Using mineral processing techniques to separate phases that contain precious and rare metals.
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| 今後の研究の推進方策 |
Future issues include analysis of a larger number of samples, consideration of recovery methods, and economic feasibility of the recovery project. Therefore, more samples will be collected in larger quantity and analyzed based on the techniques initially mentioned in the research proposal. Several recovery methods will be studied, and the economics of the recovery project will be investigated in the future.
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