METHOD FOR PRODUCING SILVER FROM SILVER CHLORIDES AT REDUCING WITH USE OF GASEOUS HYDROGEN Russian patent published in 2007 - IPC C22B11/02 

FIELD: metallurgy, namely processes and equipment for extracting silver from its chlorides by means of gaseous hydrogen at elevated temperature.

SUBSTANCE: method comprises steps of reducing silver chloride by heating it and soaking in gaseous hydrogen flow heated up to temperature exceeding 400°C. Gas leaving reaction chamber is subjected to bubbling through water for producing and aqueous solution of HCl. Reduction is realized while increasing temperature at intermediate soaking: at temperature 450°C±5°C for 15 - 25 min and then after increasing temperature at rate 2 - 4°C /min till temperature 460°C±5°C for time period 7 - 15 min. Then temperature is increased at rate 3 - 7°C/min till temperature 560°C±10°C. Metal extraction from silver chloride exceeds 99% of silver content in silver chloride for time period of performing process during 80 - 90 min.

EFFECT: enhanced efficiency of silver extraction process due to increased reducing rate.

4 cl, 1 dwg, 1 ex