微波焙烧预处理难浸含金硫精矿

Pretreatment of refractory gold-bearing sulfur concentrates by microwave roasting

对难浸含金硫精矿进行微波焙烧,考察微波功率、矿量(即样品质量)和焙烧时间对样品质量损失率和浸出率的影响。结果表明:当微波功率为16 k W、焙烧时间为50 min、矿量为900 g时,样品质量损失率可达28.12%,浸出率可达71.56%,较原矿直接碘化浸出率(9.82%)有了大幅提高。利用XRD和SEM技术分析焙烧前后样品的成分和表面形貌,微波焙烧后的样品较原矿更为松散、多孔,更利于浸出。

After roasting refractory gold-bearing sulfur concentrates by microwave, the influences of microwave power, the ore mass and roasting time on sample mass loss rate and leaching rate were investigated. The results show that sample mass loosing rate is 28.12% and iodide leaching rate is 71.56% after 900 g raw ore is roasted for 50 min at power of 16 k W, and the leaching rate after microwave pretreatment increases greatly than that of raw ore rate（9.82%）. With the XRD and SEM technology analyzing mineral composition and surface morphology, roasted sample is more beneficial to leaching than raw ore because of ore inside becoming loose and generating plenty of pores.