METHOD OF SILICON- CALCIUM-CONTAING CONCENTRATE PURIFICATION FROM ADMIXTURES Russian patent published in 2009 - IPC C22B34/12 C22B1/11 

FIELD: chemistry.

SUBSTANCE: invention relates to method of purifying natural and technological silicon- calcium-containing concentrate from admixtures of sulfur, phosphorus and carbon and can be applied in production of materials used in coating of welding electrodes. Method includes crashing of concentrate into fractions not more than 100 mcm. Milled concentrate is distributed in layer not more than 1mm on working surface, which has coefficient of light flow reflection not less than 0.6. Then concentrate is processed by influencing on it by movable laser ray with density of irradiation power 10²-10⁶ wt/cm² at rate of laser ray axis movement 0.3-2.0 cm/s relative to processed concentrate, admixtures being removed as gaseous products from zone, located at distance 2-4 mm from laser ray axis.

EFFECT: increasing degree of concentrate purification from ensuring high degree of purification from sulfur and phosphorus, as well as increasing ecological compatibility of method.

2 cl, 6 ex, 1 tbl