Purity clear sealed quartz tube

A method for producing a large-diameter quartz glass tube is to put quartz sand raw material into a crucible of a melting furnace, reduce the crucible to a minimum through the upper cover, and melt the molten material into a liquid, and the liquid is discharged at a high temperature and then discharged through a vent hole. Gas impurities and liquid impurities, the crucible is lifted through the upper cover, and the liquid enters the molding machine table for molding, and the raw materials are continuously added to the crucible, and the quartz glass tube mother tube is pulled down by the tractor to make the quartz glass tube main tube Input into the secondary molding machine for walking and expanding, and expand into a large-diameter glass quartz glass tube with a wall thickness of 5 mm or more when Φ520 ±0.1 mm. Finally,the expanded quartz glass tube is sequentially cut off at both ends, acid Wash, ultrasonic cleaning, annealing.