含砷金精矿焙烧氧化预处理工艺研究

Study on the Roasting Oxidation Pretreatment Process of Arsenic Bearing Gold Concentrate

以某含砷金精矿为实验原料,对比研究了一段焙烧与两段焙烧两种焙烧氧化预处理方式对原料中砷的脱除与有价金属回收效果的影响。实验结果表明:1)两段焙烧的脱砷效果优于一段焙烧;2)对两种焙烧方式获得的焙砂进行酸浸提铜,铜的浸出率均较高,实现了铜的回收;3)酸浸提铜后再进行氰化浸出提金银,两段焙烧的提金效果明显优于一段焙烧,金含量由最初的34 g/t降至4.4 g/t。

Taking an arsenic bearing gold concentrate as experimental material,the effects of the pretreatment methods of one-stage roasting and two-stage roasting on arsenic removal and valuable metal recovery were compared.The experimental results had shown that:1)the arsenic removal effect of the two-stage roasting was better than the one-stage roasting;2)the leaching rate of copper from calcine obtained by two roasting methods was high,with realizing the recovery of copper;3)After copper extraction by acid leaching and extraction gold and silver by cyanide leaching,the leaching effect of the gold of two-stage roasting was obviously better than that of one-stage roasting,and the gold content was reduced from the initial 34 g/t to 4.4 g/t.