CONTINUOUS RECOVERY METHOD FOR FINE SILICA SAND OR THE LIKE CONTAINED IN SLURRY AND DEVICE THEREFOR

摘要

PURPOSE:To enable the efficient and continuous recovery of fine silica sand, etc., by adding a flocculating agent and pulp fibers to the slurry generated in a glass polishing stage, etc., and separating the fine silica sand, etc. CONSTITUTION:The flocculating agent is added to the slurry of a low concn. (about 0.5 to 5%) contg. the fine silica sand, etc., to settle the slurry in a settling chamber 1. The settled component of the slurry is taken out and the pulp fibers are added to the taken out slurry in a first mixing and stirring device 5 to flocculate the fine silica sand, etc. The flocculating agent is added to the flocks of the fine silica sand, etc., to accelerate the flocculation of the fine silica sand, etc., in a second mixing and stirring device 12. The slurry is separated to the water and the flocs using a sieving surface device 15. The flocs are heated in a steam heater 18. The flocks in a heated state are compressed to squeeze out the water in a compressing device 17. As a result, the fine silica sand, etc., are efficiently and continuously recovered from the slurry.