METHOD OF NOBLE METAL EXTRACTION FROM LIQUID SLAG WHEN IT IS REMOVED FROM COAL BOILER AND DEVICE FOR IMPLEMENTATION OF THIS METHOD Russian patent published in 2012 - IPC C22B7/04 C22B11/00 F22B33/00 

FIELD: metallurgy.

SUBSTANCE: liquid slag tapped into the boiler slag tap is continuously purged with hot air supplied through the perforated tap bottom connected with the compressed air collector. Then, the slag is removed through the overflow slag valve and fed into a centrifuge where noble metals are separated from the slag. The slag separated from the metal is pulverised by means of the centrifugal forces and the slag drops are pre-cooled in the flow of a cooling medium moving in the opposite direction in the cooler. Then the solidified slag particles are collected in the separator, are kept in the slag intermediate storage unit and finally they are cooled with compressed air. Whereby the air heated in the slag cooler is used in the boiler burners and to purge the liquid slag. The cooling medium flow after it solidified the slag is cooled in a condenser. The condensate is used for pre-cooling of the pulverised slag. The metal separated from the slag is accumulated in the centrifuge, and periodically or continuously it is withdrawn from it for further processing.

EFFECT: no suctions of cold air into the boiler furnace through the tap hole, increased plasticity of the liquid slag removed from the boiler furnace and extraction of noble metals from it, oxidation of reduced iron particles, afterburning of carbon left unburned in the furnace and slag heat recovery for heating of the compressed air.

19 cl, 5 dwg