METHOD OF PROCESSING ELECTROPLATING SLUDGE Russian patent published in 2011 - IPC C22B7/00 C22B5/04 

FIELD: chemistry.

SUBSTANCE: method involves thermal processing of sludge in air and then obtaining a reaction mass using aluminium powder. Thermal processing of sludge is carried out in two steps, at the first step at 180-200°C for 1.5-2.0 hours, at the second step at 450-550°C for 15-30 minutes, and the reaction mass is obtained by mixing the sludge with thermite mixture. The thermite mixture contains 20-50 wt % aluminium and 50-80 wt % iron oxide and is added to the reaction mass in amount of 50-95 wt %. An aluminium-thermal reaction is then carried out to form an alloy and slag.

EFFECT: high efficiency of the process for aluminium-thermal reduction of electroplating sludge while widening the range of processed sludge and low power consumption of the method.

3 cl, 3 ex