Silver- containing sulfides can be decomposed by cyanide solutions, but the rate of decomposition is slow. If the concentrate is calcined with salt to convert silver into silver chloride, it is easily decomposed by the cyanide solution. The calcined salt is usually added in an amount of 5% to 15% by weight of the concentrate, and the concentrate is required to have a sulfur content of 2% to 3% to satisfy the conditions of the self-heating roasting. The sulfur-containing low amounts may be added in an amount calculated pyrite. Since the base metal and the presence of impurities in the many complex reactions occur during firing chloride. But in the case of silver, it produces silver chloride by the following reaction:
Ag 2 S+2NaCl+2O 2 
2AgCl+Na 2 SO 4
The chlorination roasting of the silver concentrate is usually carried out at about 600 ° C in a multi-hearth roaster.
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