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Chlorination roasting-coupled water leaching process for potash recovery from waste mica scrap using dry marble sludge powder and sodium chloride
- Source :
- International Journal of Minerals, Metallurgy and Materials. 27:1203-1215
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- The present paper reports the effective utilization of marble sludge powder (MSP) for the recovery of potash values from waste mica scrap using chlorination roasting-water leaching method. Characterization studies indicated the presence of dolomite as the major mineral phase in MSP, whereas muscovite and quartz were observed in the mica sample. The acid leaching studies suggest a maximum of 22% potash recovery under conditions: 4 M H2SO4 acid, particle size of ∼100 µm, stirring speed of 600 r/min, leaching temperature of 75°C, and leaching time of 90 min. The chlorination roasting-water leaching process was adopted to achieve the lowest level of 80%–90% potash recovery. The optimum conditions for the recovery of ∼93% potash from mica (∼8.6wt% K2O) requires 900°C roasting temperature, 30 min roasting time, and 1:1:0.75 mass ratio of mica: MSP: NaCl. The roasting temperature and amount of NaCl are found to be the most important factors for the recovery process. The reaction mechanism suggests the formation of different mineral phases, including sylvite (KCl), wollastonite, kyanite, and enstatite, during roasting, which were confirmed by X-ray diffraction (XRD) analyses and scanning electron microscopy (SEM) morphologies. The MSP-blended NaCl additive is more effective for potash recovery compared with the other reported commercial roasting additives.
- Subjects :
- Sylvite
Chemistry
Mechanical Engineering
Muscovite
Potash
Dolomite
0211 other engineering and technologies
Metals and Alloys
02 engineering and technology
engineering.material
021001 nanoscience & nanotechnology
Wollastonite
Geochemistry and Petrology
Mechanics of Materials
Materials Chemistry
engineering
Leaching (metallurgy)
Mica
0210 nano-technology
021102 mining & metallurgy
Roasting
Nuclear chemistry
Subjects
Details
- ISSN :
- 1869103X and 16744799
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- International Journal of Minerals, Metallurgy and Materials
- Accession number :
- edsair.doi...........f32b494abb43a19fb0052e5d7cf294a6