METHOD FOR PRODUCING SILICA ABRASIVE GRAIN AND METHOD FOR PRODUCING GLASS SUBSTRATE FOR MAGNETIC DISK

摘要

PROBLEM TO BE SOLVED: To provide a method for producing silica abrasive grains free from the risk of damaging the object to be polished and also free from deterioration in a polishing speed.SOLUTION: Provided is a method for producing silica abrasive grains including: a treatment of subjecting silicic acid to polycondensation to produce the primary grains of silica; and a treatment of passing a solution including the primary grains through a capillary tube and fusion-growing the primary grains each other in the capillary tube while retaining the temperature of the capillary tube to the fixed one to produce the fused grains of silica.