Abstract:

Extraction gold from the complex silver anode slime is that points of gold liquid can be obtained by chloridizing the aqueous solution of the silver anode slime，and then qualified gold powders are obtained after reducing sodium nitrite.Because of the more outsourcing raw material，obtained the points of gold liquid contain platinum as well as palladium，the efficiency of sodium nitrite reduction of the liquid can only be controlled around 65%，thus sodium nitrite reduction for the second time is required.However，the content of palladium in the gold powders exceed standard，and the reword can lead to enrichment of circulation，which will go against the recycle of palladium.Extraction gold and palladium from the complex silver anode slime after sodium nitrite reduction for the first time.Firstly，on the basis of traditional technology of extraction in raffinate and small text on DBC extraction of gold，and we apply palladium black hydrazine hydrate to reduce two chlorine two ammino and palladium so as to get palladium black.And then Industry expanding test is carried out in order to identify the best condition during the process.Overall，technical indicators are all better，additionally，direct recovery efficiency of gold and palladium are 99.52% and 94.53%，respectively.

Key words: sodium nitrite reduction, DBC extraction of gold, hydrazine hydrate reduction, dichloro diamine collaterals and palladium