关键词: 难选金矿, 微波预处理, 边磨边浸, 非氰化

Abstract:

The analysis results of ore chemical composition at a certain refractory gold demonstrated that the gold grade was around 3.51×10-6，content of SiO2 was as high as 71.88%，harmful element was mainly with the presentation of organic carbon and sulfur.In addition，the content of organic of carbon even reached up to 2.51%，which hampered the following leaching procedure seriously.After analyzing the XRD and phase of gold，it was found that the ore main minerals were primary composed with quartz，calcite and sulfide ore，while sulfide ore was given priority to with pyrite.According to the characters of refractory gold ore，when employing the cyanide reagent TL to leaching directly，low leaching rate can be obtained.Therefore，we used microwave method for pretreatment with grinding and leaching simultaneously without cyaniding，and paid attention to the microwave roasting time，microwave roasting temperature，the amount of leaching agent TL，liquid-solid ratio，and the impact of mill leaching time on the gold leaching rate.The results showed under the conditions that microwave roasting temperature at 650 ℃，and microwave baking time of 45 min，the gold leaching rate of 71.64% was achieved when a non-cyanide leaching dosage was 6 kg/t，liquid to solid ratio was about 4∶1，and grinding time was 6 h.

Key words: refractory gold ore, microwave pretreatment, grinding and leaching, non-cyanide