ZONE MELTING PROCESS (VARIANTS) Russian patent published in 2004 - IPC

FIELD: processes for chemical-thermal-compression treatment of melts and refractory compounds, possibly production and purification of materials including high-purity matters and alloys on their base.

SUBSTANCE: process according to first variant of invention designed for removing toxic and radio-active components from melts comprises steps of zone melting in medium of helium-base gas composition due to moving melting zone at rate no more than 5 mm/min at increased pressure up to 500 MPa, temperature 2550°C and temperature gradient up to 1000°C relative to melting temperature of lightest component of charged material until impurity purification degree 10^-6 at%. According to second variant of invention zone melting of melts is realized for separating melt metals by components with melting temperature and atomic weights near to those of basic metal. Process comprises steps of zone melting in atmosphere of gas composition on base of argon in suspended state due to moving melting zone at rate no more than 5 mm/min at increased pressure up to 700Mpa. Temperature up to 2200°C and temperature gradient no more than 600°C until impurity purification degree 10^-5 at%. In third variant of invention realized for separation of melt by isotopes with different atomic weights and the same melting temperatures, zone melting is realized in atmosphere of gas composition on base of inert gases in suspended state due to moving melting zone at rate no more than 1 mm/min at increased pressure up to 1000 Mpa and temperature up to 2550 °C until impurity purification degree 10^-3 at% and at isotope content purification degree no less than 99.97 at%.

EFFECT: possibility for achieving high degree of separation and purification of materials.

6 cl, 4 ex