焙烧氧化处理对含金硫精矿工艺矿物学特性的影响研究

基于矿物解离分析仪,结合X射线全自动衍射仪、扫描电子显微镜和激光粒度分析仪,对湖南某矿山浮选铅锌矿后的难处理含金硫精矿焙烧氧化处理前后的矿物性质、粒度、裂纹和孔隙及金矿物解离度和连生情况进行了测试分析。结果显示:焙烧氧化处理使该含金硫精矿中毒砂和黄铁矿氧化转变为赤铁矿,氧化过程会导致矿物碎裂,颗粒粒度变细,颗粒表面疏松多孔;金矿物单体解离度由原来的34.66%提高到83.79%,提高约2.4倍。焙烧氧化处理使矿物颗粒碎裂、裂纹和孔隙增多,金矿物单体解离度提高,有效增加了浸出剂在矿物颗粒中的渗透率和与金矿物的接触面积,有利于金的浸出。该结果对研究难处理含金硫精矿在焙烧氧化处理前后工艺矿物学特性的变化具有重要参考意义,可为此类矿物中金的提取提供指导。

Effect of roasting oxidation treatment on process mineralogical characteristics of gold-bearing sulfur concentrate

The mineral properties,particle size,crack and pore size,gold mineral liberation degree and continuity of the refractory gold-bearing sulfur concentrate from Hunan Province before and after roasting oxidation treatment were tested and characterized based on mineral liberation analyzer(MLA)with the help of X-ray diffraction(XRD),scanning electron microscopy(SEM)and laser particle size analyzer.The results showed that the roasting oxidation treatment could oxidize and convert the arsenopyrite and pyrite in the gold-bearing concentrate into hematite,and in the process the minerals were fragmented to form fine particles with loose and porous surface.The roasting oxidation treatment increased the monomer liberation degree of the gold mineral from the original 34.66%to 83.79%,2.4 times higher.The roasting oxidation treatment could cause the increase of fragmentation,cracks,pores and monomer liberation of gold minerals,and could effectively improve the permeability of leaching solution in mineral particles and its contact area with gold minerals,which is conducive to the leaching of gold in gold-bearing minerals.This study has major reference significance in studying the variation of the mineralogical characteristics of refractory gold-bearing sulfur concentrate before and after roasting oxidation treatment,and provides guidance for gold extraction from this kind of minerals.