Manufacturing method of eco-friendly glass using coal preparation

摘要

The present invention is a step of preparing a glass raw material by mixing 50 to 90% by weight of pumice stone, sodium carbonate (Na ₂ CO ₃ ) 3 to 30% by weight, and calcium carbonate (CaCO _{3 ) 3 to 30% by weight generated in the process of coal selection} And, melting the glass raw material at a temperature of 1150 ~ 1600 ℃, maintaining the molten result at a temperature of 550 ~ 700 ℃ for stress relief, and slowly cooling the resultant maintained at a temperature of 550 ~ 700 ℃ It relates to a method for manufacturing glass from recycled pumice stone, characterized in that it comprises the step of obtaining glass. According to the present invention, it is possible to manufacture glass at low process cost by recycling pumice stone, which is a waste generated in the process of coal selection.