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Optimization of recovering cerium from the waste polishing powder using response surface methodology
| Content Provider | Scilit |
|---|---|
| Author | Lu, Shuaidan Sun, Shuchen Huang, Xiaoxiao Tu, Ganfeng Zhu, Xiaoping Kong, Xianghui |
| Copyright Year | 2017 |
| Abstract | Recovery of rare earth from the waste rare earth polishing powder is of great importance to improve the process economics. The current recovery methods result in the generation of large quantities of polluted discharge necessitating waste treatment systems. The present work attempts to extract cerium from rare earth slurry waste by thiourea reducing and hydrochloric acid leaching, towards which central composite technique of the response surface methodology is adopted to design the experiments and to optimize the process conditions to maximize the recovery rate. The effects of four major parameters such as temperature, duration of leaching, dosage of thiourea, and the concentration of HCl were assessed, and the optimal process conditions were identified. Analysis of variance (ANOVA) was utilized to identify the suitable model and to eliminate the insignificant model parameters. The optimized process conditions for maximizing the recovery rate are identified to be a leaching temperature of 90°C, duration of 150 min, thiourea dosage of 0.2 g/g, and HCl concentration of 3.5 mol/l. A recovery of 91.23% could be achieved and validated through repeat experimental runs at the optimized process conditions. The optimized process samples are characterized utilizing XRD to validate the recovery. |
| Related Links | http://www.degruyter.com/downloadpdf/j/gps.ahead-of-print/gps-2016-0030/gps-2016-0030.xml |
| ISSN | 21919542 |
| e-ISSN | 21919550 |
| DOI | 10.1515/gps-2016-0030 |
| Journal | Green Processing and Synthesis |
| Issue Number | 2 |
| Volume Number | 6 |
| Language | English |
| Publisher | Walter de Gruyter GmbH |
| Publisher Date | 2017-01-01 |
| Access Restriction | Open |
| Subject Keyword | Green Processing and Synthesis Applied Chemistry Cerium Leaching Recovery Thiourea Waste Rare Earth Polishing Powder Journal: Green Processing and Synthesis, Issue- 7 |
| Content Type | Text |
| Resource Type | Article |
| Subject | Industrial and Manufacturing Engineering Environmental Chemistry Health, Toxicology and Mutagenesis Fuel Technology Renewable Energy, Sustainability and the Environment Chemical Engineering |
