THERMAL PLASMA PROCESS FOR THE RECLAIMING OF CeO_(2)-BASED GLASS POLISHING POWDERS

摘要

The method for reclaiming of ceria-based glass polishing powders from the rare earth (RE) containing industrial wastes using thermal plasma processing of dispersed RE salts and solutions was developed. The most advantageous variant on plasma stage efficiency and on reclaiming schematic simplicity is observed to be the spray electric arc plasma processing of the concentrate nitrate solutions with surfactant. It result in as-prepared influorated powders (< 55percent ceria in solid solution) with good polishing for some optical silicate glasses (polishing rate 40-51 mg / 30 min) and for hard mineral crystals.