METHOD FOR UTILIZING OF SEWAGE PRECIPITATES OF ELECTROPLATING PROCESSES Russian patent published in 1998 - IPC

FIELD: utilization of precipitates of industrial sewage. SUBSTANCE: precipitate of sewage of electroplating processes is affected by drying, grinding, undersizing through sieve and by dosing. Then mixing with silicate-containing component and with alkali-containing component followed by heat treatment is carried out. Thus prepared glass mass is mold by compressing or by rolling and is processed to prepare devitrified glass such as Pyroceram. The latter process is carried out either by single-step regime at 800-1100 C within 30-120 min or by double-step regime which involves sustaining at 720-750 C within 30-60 min and sustaining at 820-1000 C within 30-60 min. Additives, namely, crystallization agents may be additionally used, their quantities being 0.2-10 %. EFFECT: improved efficiency of the method. 3 cl, 1 tbl