广西某金矿石选矿工艺试验

Processing Test on a Gold Ore from Guangxi

广西某含砷金矿石金品位4.20 g/t,含砷1.76%,金主要呈超显微金、胶态金的形态包裹于黄铁矿、毒砂及其次生矿物褐铁矿中,嵌布粒度细,较难选别。为回收该矿石中的金,分别采用直接浸出工艺和浮选—焙烧—浸出工艺进行选矿试验。结果表明:1堆浸直接浸出工艺金浸出率低,在入浸矿石粒度-5 mm时浸出率仅28.48%;2全泥氰化浸出工艺在磨矿细度-0.074 mm6.58%时,金浸出率34.03%,仍不理想;3浮选—焙烧—浸出工艺在磨矿细度-0.074 mm5.74%、焙烧温度550℃、氰化钠用量1 500 g/t时,可获得金浸出率90.43%的良好指标,可作为确定该金矿石选矿工艺的技术依据。

There is 4. 20 g / t gold,1. 76% arsenic in an arsenic bearing gold ore from Guangxi.Gold mainly in super micro or colloidal morphology packed in pyrite,arsenopyrite and secondary limonite. Gold is finely disseminated and difficult to be separated. To recovery the gold in ore,beneficiation test were conducted via direct leaching process and flotation-roasting-leaching process. The results showed that: 1gold leaching rate by direct heap leaching process is low,leaching rate was only 28. 48%at feeding granularity of- 5 mm; 2gold leaching rate by all slime cyanidation leaching process is only28. 48% at grinding fineness of- 0. 074 mm 6. 58%; 3gold leaching rate of 90. 43% was obtained by flotation-roasting-leaching process at grinding fineness of- 0. 074 mm 5. 74%,calcination temperature550 ℃,sodium cyanide dosage of 1 500 g / t. Test results can be the basis for determination of dressing process for the gold ore.