Leaching time,

min

Extraction rate %

La

Ce

Y

TiO₂

SiO₂

P₂O₅

60

81.8

73.0

19.9

17.6

3.3

96.5

120

89.3

77.8

19.9

17.1

0.0

93.7

180

89.3

79.8

25.2

18.0

0.0

91.4