| 摘要 |
When a waste wax composition containing a filler is treated so that the filler is recovered and thus reclaimed, almost all the impurities coming from the lost wax casting mold may be removed, thereby recovering and thus refining at a high purity, a filler of a lost wax composition. Crude reclaimed filler is first produced by dissolving and dispersing a waste wax composition in an organic solvent, and separating a dissolved wax phase from a solids/wax-containing fraction. The crude reclaimed filler is then dispersed in an aqueous alkaline solution, so as to dissolve and thus remove alkali-soluble impurities, followed (or preceded) by dispersion in an acidic aqueous solution so as to dissolve and thus remove acid-soluble impurities. <IMAGE> |
