Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore
The Nuclear Power Plant, which uses uranium as a fuel, is considered as a clean source of energy with low carbon footprint and less environmental damage. In processing the uranium ore, the filtration of alkaline leach slurry generated by oxidative pressure leaching is a challenge due to very fine gr...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Cleaner Chemical Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772782322000778 |
| _version_ | 1828268374046539776 |
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| author | Md Serajuddin Anand Rao K Sulekha Mukhopadhyay |
| author_facet | Md Serajuddin Anand Rao K Sulekha Mukhopadhyay |
| author_sort | Md Serajuddin |
| collection | DOAJ |
| description | The Nuclear Power Plant, which uses uranium as a fuel, is considered as a clean source of energy with low carbon footprint and less environmental damage. In processing the uranium ore, the filtration of alkaline leach slurry generated by oxidative pressure leaching is a challenge due to very fine grind size coupled with high total dissolved solutes (TDS). The present study aimed at improving and understanding the filtration of the leach slurry with the help of slurry rheology. The effect of solid concentration, temperature, particle size, and dosages of dewatering aids on the rheological behavior of the slurry and the filtration performance was investigated. The slurry rheology was delineated by the Herschel–Bulkley model, temperature effects were incorporated using the Arrhenius type model, and particle size distribution (PSD) was represented by the Rosin–Rammler PSD model. The dosages of dewatering aids were compared using rheological parameters. It was found that the filtration rate decreases as solid concentration increases (10 to 75%, w/w) due to an increase in the shear stress (9.93 to 757 Pa at 1400 s−1). The leach slurry showed shear thickening at ≤ 60% solids (w/w) and shear thinning at ≥ 70% solids. The maximum solid packing volume fraction was found to be 0.59 and 0.54 at 1300 and 441 s−1, respectively. Increase in filtration rate was observed at elevated temperatures as the apparent viscosity (at 1300 s−1) decreased from 0.0195 Pa.s at 20 °C to 0.0135 Pa.s at 70 °C. The fluid flow activation energy was determined to be 5.5 and 7.1 kJ/mol at 1110 s−1 for 50 and 73% solid concentration (w/w), respectively. When the particle size (d90) was changed from 66 to 42 µm, a decrease in filtration rate was observed due to an increase in apparent viscosity from 0.0120 to 0.0163 Pa.s at 1400 s−1. The high molecular weight polyacrylamide based non-ionic synthetic flocculant N 100 and non-ionic biodegradable polysaccharide surfactant guar gum formed flocs through the bridging mechanism and gave best flocculation results, and therefore selected. The present work helps the researchers in better understanding and improving the filtration process of ore slurries. |
| first_indexed | 2024-04-13T05:17:56Z |
| format | Article |
| id | doaj.art-e3c56bd17ced42638bf028ad587978c7 |
| institution | Directory Open Access Journal |
| issn | 2772-7823 |
| language | English |
| last_indexed | 2024-04-13T05:17:56Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
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| series | Cleaner Chemical Engineering |
| spelling | doaj.art-e3c56bd17ced42638bf028ad587978c72022-12-22T03:00:51ZengElsevierCleaner Chemical Engineering2772-78232022-12-014100079Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone oreMd Serajuddin0Anand Rao K1Sulekha Mukhopadhyay2Mineral Processing Division, Bhabha Atomic Research Centre (BARC), AMD Complex, Begumpet, Hyderabad 500016, India; Department of Engineering Sciences, Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, Maharashtra 400094, India; Corresponding author: Mineral Processing Division, Materials Group, Bhabha Atomic Research Centre, AMD Complex, Hyderabad, Telangana 500016, India.Mineral Processing Division, Bhabha Atomic Research Centre (BARC), AMD Complex, Begumpet, Hyderabad 500016, India; Department of Engineering Sciences, Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, Maharashtra 400094, IndiaDepartment of Engineering Sciences, Homi Bhabha National Institute (HBNI), Anushaktinagar, Mumbai, Maharashtra 400094, India; Chemical Engineering Division, Bhabha Atomic Research Centre (BARC), Mumbai, Maharashtra 400085, IndiaThe Nuclear Power Plant, which uses uranium as a fuel, is considered as a clean source of energy with low carbon footprint and less environmental damage. In processing the uranium ore, the filtration of alkaline leach slurry generated by oxidative pressure leaching is a challenge due to very fine grind size coupled with high total dissolved solutes (TDS). The present study aimed at improving and understanding the filtration of the leach slurry with the help of slurry rheology. The effect of solid concentration, temperature, particle size, and dosages of dewatering aids on the rheological behavior of the slurry and the filtration performance was investigated. The slurry rheology was delineated by the Herschel–Bulkley model, temperature effects were incorporated using the Arrhenius type model, and particle size distribution (PSD) was represented by the Rosin–Rammler PSD model. The dosages of dewatering aids were compared using rheological parameters. It was found that the filtration rate decreases as solid concentration increases (10 to 75%, w/w) due to an increase in the shear stress (9.93 to 757 Pa at 1400 s−1). The leach slurry showed shear thickening at ≤ 60% solids (w/w) and shear thinning at ≥ 70% solids. The maximum solid packing volume fraction was found to be 0.59 and 0.54 at 1300 and 441 s−1, respectively. Increase in filtration rate was observed at elevated temperatures as the apparent viscosity (at 1300 s−1) decreased from 0.0195 Pa.s at 20 °C to 0.0135 Pa.s at 70 °C. The fluid flow activation energy was determined to be 5.5 and 7.1 kJ/mol at 1110 s−1 for 50 and 73% solid concentration (w/w), respectively. When the particle size (d90) was changed from 66 to 42 µm, a decrease in filtration rate was observed due to an increase in apparent viscosity from 0.0120 to 0.0163 Pa.s at 1400 s−1. The high molecular weight polyacrylamide based non-ionic synthetic flocculant N 100 and non-ionic biodegradable polysaccharide surfactant guar gum formed flocs through the bridging mechanism and gave best flocculation results, and therefore selected. The present work helps the researchers in better understanding and improving the filtration process of ore slurries.http://www.sciencedirect.com/science/article/pii/S2772782322000778RheologyFiltrationSolid concentrationAlkaline pressure leachingLeach slurryDewatering aids |
| spellingShingle | Md Serajuddin Anand Rao K Sulekha Mukhopadhyay Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore Cleaner Chemical Engineering Rheology Filtration Solid concentration Alkaline pressure leaching Leach slurry Dewatering aids |
| title | Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore |
| title_full | Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore |
| title_fullStr | Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore |
| title_full_unstemmed | Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore |
| title_short | Influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore |
| title_sort | influence of rheology in the filtration of leach slurry generated by alkaline pressure leaching of a limestone ore |
| topic | Rheology Filtration Solid concentration Alkaline pressure leaching Leach slurry Dewatering aids |
| url | http://www.sciencedirect.com/science/article/pii/S2772782322000778 |
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