... self-hardening sand is mixed of natural silica sand, resin and hardener. The whole line compose of sand reclamation system and molding ... separation, Used-sand temperature adjustment, New&used sand conveying, Add resin or sodium silicate, etc, Mix sand, Making core, Molding, ... reclamation and reuse,thus can reduce the amount of resin to reduce the cost of resin-bonded sand,but also to reduce the ...