INSOLUBILIZATION METHOD OF THE FLUORINE IN WASTE FOUNDRY SAND AND THE PRODUCTION METHOD OF THE ROADBED MATERIAL

Abstract

 We have studied how the fluorine-insoluble in the waste foundry sand (chromite sand) and production method of the roadbed material with insolubilized waste foundry sand. And we got following knowledges.
 (1) We found a minimum mixing rate to insolubilize of fluorine in the waste foundry sand by the ingenuity of mixing procedure.
 (2) Now we can insolubilize the waste foundry sand including comparatively high concentration fluorine (elution concentration: 20-70mg/l) by the mixing time difference of MgO and blast furnace cement.
 (3) In the verification test the roadbed material made from the insolubilized waste foundry sand satisfied reference value of environment safety.