FIELD: metallurgy.
SUBSTANCE: method involves preliminary installation in lower part of a melting pot of fuse providing crystallisation of end product, charging of the cavity of the melting pot with raw material consisting of sand grains so that there provided is continuous supply to the cavity of the melting pot of new additional portions of raw materials from the volume of the additional tank, which is interconnected with it and isolation of the melting pot cavity with monocrystal being formed in it from outside environment, and treatment of raw material with artificially created physical field at constant rotation of the melting pot with the crystal being formed in its cavity about its longitudinal axis, at the pressure, the value of which does not correspond to the value of atmospheric one. Besides, silicon oxide particles are used as initial raw material, which are obtained by crushing of sand grains to the size of 1-8 mcm, which are contained in the air suspension formed in the melting pot cavity in the volume of 40-60%, and as artificially created physical field - rotating alternating magnetic field, the intensity of which in conversion zone of initial raw material is 1×105÷1×107 A/m, and frequency is 40-70 Hz, treatment of raw material is performed in the melting pot consisting of three independent parts: upper detachable part being a raw material tank; a serviceable melting pot that is immediately intended for growth of monocrystals, the cavity of which is interconnected with the tank volume; and lower detachable part attached to lower part of the serviceable melting pot, which is intended for collection of wastes formed in it during treatment, and namely slags and granules of silicon, which is interconnected with its inner volume through calibrated orifices made in a detachable partition wall. Besides, to the cavity of the serviceable melting pot there constantly supplied are compressed air jets under excess pressure of 0.1-0.6 kgf/cm2, and rotation of the melting pot is performed during 54-72 minutes at two stages, at the first one of which the rotation axis constantly keeps vertical orientation; and at the second stage the above axis changes its initial position from time to time by being diverted from it through the earlier specified angle of 5-15°. The melting pot performs the function of a closing connecting link for the system generating alternating magnetic fields.
EFFECT: invention allows obtaining monocrystals of columnar shape from common sand that requires no additional preparatory operations related to its cleaning or benefication.
2 cl, 2 dwg
