What is the method of producing silicon dioxide?

The diluted sodium silicate is filtered by ion exchange method to remove impurities, and then the silica sol is prepared by cation exchange, anion exchange, Ph adjustment, evaporation or ultrafiltration concentration. Silica powder method: add distilled water and sodium hydroxide (reagent grade) into the reaction tank, raise the temperature to 65℃, add a certain amount of ammonia to adjust the alkalinity, add silica powder in batches under stirring, control the temperature below 83℃, continue stirring for 2 ~ 3h after adding silica powder, sample and analyze when the Ph value drops to 9 ~ 10, and cool to 50℃ under stirring after the reaction is completed. Unreacted silicon powder can be recovered. ; Sulfuric acid method: mixing dilute sodium silicate and dilute sulfuric acid, reacting at 20-30℃ to prepare silica gel, aging for 4 hours, soaking in 2%-2.5% dilute sulfuric acid, washing with water at 40-50℃, dehydrating in a drum dryer until the water content is less than or equal to 80%, drying until the water content is less than or equal to10%, and placing at 500-550℃. Application fields of Guangzhou Jingyi New Materials Co., Ltd.: coating, paint, ink, battery, toner, food, plastic, paper making, cosmetics, silicone rubber, adhesive, various stone adhesives, sealant, defoamer, composite material, cable gel, cable insulation adhesive, colloidal storage battery, ceramic glaze, industrial lubricants, synthetic grease, unsaturated polyester resin, layered resin and gel coat.