Extraction of impurities from a magma melt containing dissolved surfactants and gas bubbles is analyzed for the simplest hydrodynamic conditions in which impurity particles move to the surface of a bubble. Their flux is proportional to D1/5 (D is the diffusion coefficient of surfactants), and the characteristic time of extraction in these conditions is very short. In the case of a rapidly expanding bubble, the particle flux is low. In the case of a contracting bubble, the flux is likewise proportional to D1/5 but the particles are concentrated in a halo around the bubble rather than on its surface.
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