2021 Fiscal Year Research-status Report
Mineralogical, geochemical, and petrological characterization of size-fractionated municipal solid waste incineration bottom ash (MSWIBA) from the perspective of precious and rare metal recovery
| Project/Area Number |
21K12312
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| Research Institution | Kyushu University |
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Principal Investigator |
サファルザデ アミルホマユン 九州大学, 工学研究院, 特任准教授 (00727381)
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| Co-Investigator(Kenkyū-buntansha) |
中山 裕文 九州大学, 工学研究院, 准教授 (60325511)
小宮 哲平 九州大学, 工学研究院, 助教 (20457451)
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| Project Period (FY) |
2021-04-01 – 2025-03-31
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| Keywords | Municipal Solid Waste / Incineration / Bottom ash residues / Dust Ash / Mineralogy / Metal recovery / Eco-friendly technology / Economic Assessment |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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| Causes of Carryover |
1) Purchasing chemicals
2) Preparing thin sections
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Research Products
(2 results)
