SILICA-BASED SOLS, PREPARATION AND USE OF THE SOLS

摘要

Silica-based sols containing silica-based anionic particles having a high specific surface area and silica-based anionic particles having a low specific surface area. The sols can be prepared by mixing a sol containing silica-based anionic particles having a high specific surface area with a sol containing silica-based anionic particles having a low specific surface area. The sols are used as flocculating agents, in combination with amphoteric or cationic polymers, particularly in the production of paper and pulp but also for water purification.