Investigation of bivariate particle size-density classification and quality differentiation of coal gasification fine slag
Physical separation has inherent limitations in the carbon-ash separation of coal gasification fine slag(CGFS). Strengthening fundamental research on the composition and structural properties of CGFS can enhance separation efficiency. This study investigates the particle size-density classification...
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| Format: | Article |
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Editorial Department of Coal Science and Technology
2025-06-01
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| Series: | Meitan kexue jishu |
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| Online Access: | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2025-0337 |
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| author | Xu SHI Lili LIU Mo CHU Suqian GU Jianfei DONG Yanyu LIU |
| author_facet | Xu SHI Lili LIU Mo CHU Suqian GU Jianfei DONG Yanyu LIU |
| author_sort | Xu SHI |
| collection | DOAJ |
| description | Physical separation has inherent limitations in the carbon-ash separation of coal gasification fine slag(CGFS). Strengthening fundamental research on the composition and structural properties of CGFS can enhance separation efficiency. This study investigates the particle size-density classification characteristic of typical GSP entrained-flow coal gasification fine slag. The distribution patterns of residual carbon, macroscopic morphology of ash samples, micro-morphology of particles, and pore structure characteristics are systematically investigated by loss on ignition analysis, XRD mineral analysis, SEM morphology analysis, and N2 gas adsorption. The results indicate that residual carbon in the CGFS primarily exists as two forms:amorphous carbon and porous carbon. Amorphous carbon accounts for approximately 8-14% of the total fine slag, while porous carbon constitutes about 10%. A clear correlation is observed between the macroscopic morphology of ash samples and their mineral compositions: ash colors ranging from deep red to light red to black correspond to mineral assemblages of hematite/iron-bearing mica, anorthite/cristobalite, and wüstite, respectively. This finding provides a basis for mineral identification in CGFS using visual features. Combining residual carbon content, micro-morphology, and pore structure of classified fractions, we traced the formation pathways of CGFS particles and categorized them into three typical groups: “Amorphous carbon”: Primarily found in fine-sized (0.074-0.25 mm) and low-density (<1.9 g/cm3) fractions, featuring interwoven carbon-ash fusion and a moderate specific surface area. “Porous carbon”: Present in medium-coarse size fractions (0.074-0.25 mm) and medium-high density fractions (1.9-2.3 g/cm3), with well-developed internal pores and a large specific surface area. “Slag particles”: Predominantly in coarse size fractions (>0.25 mm) and high-density fractions (>2.5 g/cm3), possessing the smallest specific surface area. Separation and recovery methods should be tailored to the characteristics of the two residual carbon types.Recovered amorphous carbon can serve as a fuel supplement, porous carbon is suitable for adsorption applications, and slag particles can be purposed in construction materials. |
| format | Article |
| id | doaj-art-9f994cf2fa474d499de69d259f3259e2 |
| institution | Kabale University |
| issn | 0253-2336 |
| language | zho |
| publishDate | 2025-06-01 |
| publisher | Editorial Department of Coal Science and Technology |
| record_format | Article |
| series | Meitan kexue jishu |
| spelling | doaj-art-9f994cf2fa474d499de69d259f3259e22025-08-20T03:28:38ZzhoEditorial Department of Coal Science and TechnologyMeitan kexue jishu0253-23362025-06-0153620221010.12438/cst.2025-03372025-0337Investigation of bivariate particle size-density classification and quality differentiation of coal gasification fine slagXu SHI0Lili LIU1Mo CHU2Suqian GU3Jianfei DONG4Yanyu LIU5School of Environment, Tsinghua University, Beijing 100084, ChinaSchool of Environment, Tsinghua University, Beijing 100084, ChinaSchool of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaSchool of Rare Earth Industry, Inner Mongolia University of Science and Technology, Baotou 014060, ChinaSchool of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaSchool of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, ChinaPhysical separation has inherent limitations in the carbon-ash separation of coal gasification fine slag(CGFS). Strengthening fundamental research on the composition and structural properties of CGFS can enhance separation efficiency. This study investigates the particle size-density classification characteristic of typical GSP entrained-flow coal gasification fine slag. The distribution patterns of residual carbon, macroscopic morphology of ash samples, micro-morphology of particles, and pore structure characteristics are systematically investigated by loss on ignition analysis, XRD mineral analysis, SEM morphology analysis, and N2 gas adsorption. The results indicate that residual carbon in the CGFS primarily exists as two forms:amorphous carbon and porous carbon. Amorphous carbon accounts for approximately 8-14% of the total fine slag, while porous carbon constitutes about 10%. A clear correlation is observed between the macroscopic morphology of ash samples and their mineral compositions: ash colors ranging from deep red to light red to black correspond to mineral assemblages of hematite/iron-bearing mica, anorthite/cristobalite, and wüstite, respectively. This finding provides a basis for mineral identification in CGFS using visual features. Combining residual carbon content, micro-morphology, and pore structure of classified fractions, we traced the formation pathways of CGFS particles and categorized them into three typical groups: “Amorphous carbon”: Primarily found in fine-sized (0.074-0.25 mm) and low-density (<1.9 g/cm3) fractions, featuring interwoven carbon-ash fusion and a moderate specific surface area. “Porous carbon”: Present in medium-coarse size fractions (0.074-0.25 mm) and medium-high density fractions (1.9-2.3 g/cm3), with well-developed internal pores and a large specific surface area. “Slag particles”: Predominantly in coarse size fractions (>0.25 mm) and high-density fractions (>2.5 g/cm3), possessing the smallest specific surface area. Separation and recovery methods should be tailored to the characteristics of the two residual carbon types.Recovered amorphous carbon can serve as a fuel supplement, porous carbon is suitable for adsorption applications, and slag particles can be purposed in construction materials.http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2025-0337coal gasification fine slagparticle size classificationdensity classificationcarbon-ash distributionphysical characteristics |
| spellingShingle | Xu SHI Lili LIU Mo CHU Suqian GU Jianfei DONG Yanyu LIU Investigation of bivariate particle size-density classification and quality differentiation of coal gasification fine slag Meitan kexue jishu coal gasification fine slag particle size classification density classification carbon-ash distribution physical characteristics |
| title | Investigation of bivariate particle size-density classification and quality differentiation of coal gasification fine slag |
| title_full | Investigation of bivariate particle size-density classification and quality differentiation of coal gasification fine slag |
| title_fullStr | Investigation of bivariate particle size-density classification and quality differentiation of coal gasification fine slag |
| title_full_unstemmed | Investigation of bivariate particle size-density classification and quality differentiation of coal gasification fine slag |
| title_short | Investigation of bivariate particle size-density classification and quality differentiation of coal gasification fine slag |
| title_sort | investigation of bivariate particle size density classification and quality differentiation of coal gasification fine slag |
| topic | coal gasification fine slag particle size classification density classification carbon-ash distribution physical characteristics |
| url | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2025-0337 |
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