Abstract:

There exists many refractory gold deposites occuring in the clastic carbonaceous rocks richeniag organic compounds in sea facies、Gold exist as micrograaual inclusion in the loading-gold minerals：pyrites and carbons．Gold caa。t be leached by traditional leaching method with cyanides，and the leaching ratio is about 10 、Eliminating the inclusion of laoding-gold sulfides is a powerful measure to make gold dissolve，sodium hypochlorite is a oxidant adapting to oxidize and decompose sulfides to liminate inclusions to leach gold in carbonaceous pulp．The oxidation of pyrites is influenced by the concentrations of NaClO and NaCl，solution-solid ratio and pH．After the sulfides is decomposed by sodium hypochlorite，gold is exposed to be leach by sodium hypochlorite，the leaching ratio is up to 85%．

Key words: Sodium hypochlorite, Pyrite, Decompose, Oxidize