Table 2 Calculation of the penetration depth (m) for the roasting of the mixture columbite-sodium bicarbonate at 2470 MHz.

From: Towards sustainable processing of columbite group minerals: elucidating the relation between dielectric properties and physico-chemical transformations in the mineral phase

Temperature (°C)

ε′

ε″

δ (m)

20

3.82

0.008

4.723

100

3.84

0.010

3.788

200

3.10

0.011

3.094

300

3.18

0.024

1.436

400

3.29

0.052

0.674

500

3.44

0.104

0.345

600

3.66

0.177

0.209

700

4.07

0.355

0.110

800

4.72

0.612

0.069

900

8.66

4.263

0.014

1000

16.52

9.678

0.008

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