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1 According to the leaching kinetics curves of different amount of ammonium bicarbonate, it can be inferred that the slope of each straight line in Fig.5 represents the reaction rate v . Since v = k • Cn, taking the logarithm on both sides of the equation, the relationship between lgv and lgC is shown in Fig.6.

2 The slope of the straight line in Fig.7 is 0.0998 using linear regression method, indicating that the reaction order of the leaching process of RE2(CO3)3 is 0.0998.
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