含锑金精矿碱性湿法脱锑预处理试验研究

Experimental Study on Antimony Removal Pretreatment of Antimony-Containing Gold Concentrate by Alkaline

研究使用碱性硫化钠浸出法处理某含锑金精矿,将含锑金精矿中的锑脱除,回收锑的同时提高金的回收率。由于碱性硫化物体系的特殊性,在浸出过程中容易形成多硫化物将金浸出,造成部分金的分散。通过对浸出过程中热力学条件的控制,在保证Sb浸出的前提下,抑制或减少Au的浸出。在矿浆浓度40%,浸出温度95℃,硫化钠添加量60 kg/t矿,氢氧化钠添加量30 kg/t矿条件下,取得了Sb浸出率大于96%,Au浸出率为2%的结果。

In this study, gold concentrate containing antimony is treated by alkaline sodium sulfide to removal antimony and recover gold. However, due to the special nature of the alkaline sulfide system, polysulfide is formed easily in the leaching process resulting in gold leaching, thus part of the gold is dispersed. Based on the control of thermodynamic conditions of the leaching process, the aim is to ensure Sb leaching and inhibite or reduce Au leaching. Pulp density of 40%, leaching temperature 95℃, sodimn sulfide added amount 60 kg/t ore, the sodium hydroxide added amount 30 kg/t ore, under these conditions, leaching rate of Sb is more than 96%, leaching rate of Au is 2%.