(福州大学紫金矿业学院，福州 350116)
摘 要: 在常规颚式破碎和高压辊磨两种不同破碎方式下进行细粒级金矿石的全泥氰化浸出试验，探究两种破碎方式对低品位金矿浸出效果的影响，并结合颗粒表面检测结果及扫描电镜技术，进一步研究高压辊磨机在金矿石处理中的作用机理。结果表明：高压辊磨机产品的粒度较常规颚式破碎机产品的更细，但分布不均匀；相同浸出条件下，粒径小于0.15 mm的细粒级部分金浸出率提高3.7%~6.6%。两种破碎方式产生的颗粒裂纹的数量和尺寸存在差异，高压辊磨机能产生更加丰富的微裂纹，有助于浸出剂通过裂纹的渗透，增加颗粒的比表面积和孔隙度，有利于浸出剂与目的金矿物的接触。同时，在理论上揭示破碎方式对金矿浸出效果影响的机制。
关键字: 高压辊磨机；微裂纹；比表面积；孔隙度；全泥氰化；金矿石
（College of Zijin Mining, Fuzhou University, Fuzhou 350116, China）
Abstract:The full-slime cyaniding leaching experiments of fine particles products crushed by conventional jaw crusher and high pressure grinding rolls (HPGR) were conducted, the influences of two different comminuting processes on the leaching rate of low grade gold ore processed were studied. Combined with the particle surface test results and scanning electron microscopy, the mechanism of HPGR in the treatment process of gold ore was studied furthermore. The result shows that the products of HPGR are finer but not more uniform than that of conventional jaw crusher. The gold leaching rate of less than 0.15 mm part under the same conditions can be increased by 3.7%-6.6%. The number and size of micro-cracks from this two comminuting process become obvious difference. HPGR can produce richer micro-cracks through the quasi-static pressure, which contributes to the penetration of leaching reagents through the cracks. On the other hand, the specific surface area and porosity of particles increase, which will be beneficial to the contact of gold and leaching reagents. So the mechanism of influences on the gold leaching rate of different comminuting process in theory can be revealed.
Key words: high pressure grinding rolls; micro-cracks; specific surface area; porosity; full-slime cyaniding; gold ores
