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Leaching of rare earths Y,La and Ce by sulphuric acid from fine-grained zirconosilicate ore was investigated using Taguchi method of experimental design.An orthogonal array of L_8,2~7 which denotes 7 factors at 2 levels was chosen to consider the various factors relevant to the leaching process: baking time,baking temperature,acid dosage,leaching time,leaching temperature,grind size and dilution.Statistical analysis showed that sulphation baking was a significant step for the leaching of rare earths from the whole-of-ore and optimized leaching of rare earths involved the following condition: baking for 3 h at 320 °C at 3.2 g acid/g ore acid dosage followed by water leaching at 20 °C for 1 h and dilution of 20 mL water/g ore using 300 um grind size.The effect of each leaching factor was also discussed.
Leaching of rare earths Y, La and Ce by sulphuric acid from fine-grained zirconosilicate ore was investigated using Taguchi method of experimental design. An orthogonal array of L_8,2 ~ 7 which indicates 7 factors at 2 levels was chosen to consider the various factors relevant to the leaching process: baking time, baking temperature, acid dosage, leaching time, leaching temperature, grind size and dilution. Statistical analysis showed that sulphation baking was a significant step for the leaching of rare earths from the whole-of-ore and optimized leaching of rare earths involved the following conditions: baking for 3 h at 320 ° C at 3.2 g acid / g ore acid dosage followed by water leaching at 20 ° C for 1 h and dilution of 20 mL water / g ore using 300 um grind size.The effect of each leaching factor was also discussed.