Process for wet regeneration of granular bulk materials charged with impurities and pollutants

摘要

Disclosed is a process for treatment of bulk materials which are loaded with impurities and pollutants. Preferably the process treats bulk material from the category of clay-bonded used foundry sand. Depending on the provenance of the sand, composition of the sand, and the type of binders employed, this sand is subjected to a regeneration process including dry mechanical pretreatment and wet attrition treatment to produce regenerated sand and fine grain-containing waste water. The fine grain-containing waste water is subjected to a multiple-stage waste water treatment based on agglomeration processes after adjustment of the pH level of the waste water.