云南某硫化铜银精矿火湿配合冶炼工艺研究

Silver and Copper Sulfide Concentrate Smelting Process by Pyrometallurgical and Hydrometallurgical

云南某铜银精矿铜、银、硫含量分别为5.63%、2 419 g/t和4.28%,-0.077 mm含量为79.50%。为了提高产品附加值,减少运输成本,为企业创造更好的业绩,对该精矿进行了火湿冶金工艺条件研究。结果表明,在工业食盐与试样质量比为1∶20,焙烧温度为850℃,焙烧时间为1.5 h情况下进行氯化焙烧,焙烧产物用浓度为2%的稀硫酸预处理后,再添加浓度为25%、体积为稀硫酸体积10%的氨水处理60 min,可获得96.60%和96.40%的铜、银浸出率。该方法是从铜银硫化矿精矿中高效回收铜、银的方法,具有工艺简单、回收率高、易操作等特点。

There are 5. 63% copper,2 419 g / t silver and 4. 28% sulfur in a Cu-Ag concentrate with particle size of79. 50%-0. 077 mm. In order to improve the additional value,reduce transport cost,gain the profits for enterprise,the pyrometallurgical and hydrometallurgical smelting research is conducted on the concentrate. The results show that with industrial salt to sample mass ratio of 1∶ 20 and chlorination roasting at 850 ℃ for 1. 5 h,roasted products were pretreated by 2% dilute sulfuric,and then leached for 60 min by adding 25% ammonia water,with volume equal to 10% sulfuric acid volume. Copper and silver leaching rate of 96. 60% and 96. 40% was achieved respectively. The smelting method is high efficient in recovering copper and silver from Cu-Ag sulfide concentrate,with characteristics of simple process,high recovery and easy to operation.