Abstract A comparative study was carried out to investigate the effect of high-pressure grinding rolls (HPGR) comminution on agitation leaching of gold ore in comparison with the conventional jaw crusher (JC) comminution. The HPGR comminution products were evaluated in terms of particle size distribution, specific surface area and average pore volume, and the origin and density of micro-cracks. HPGR comminution produced finer particles with larger specific surface area and average pore volume, more surficial and internal micro-cracks. It was found that intragranular micro-cracks were dominant in JC products while intergranular micro-cracks were favored by HPGR products. Under optimum HPGR conditions (medium pressure of 5.5 N/mm2), gold metal recovery during agitation leaching was increased 6.79%–10.93% while cyanide consumption was reduced 5.82%–11.11%. These results suggest that more and narrower micro-cracks included in HPGR products may enhance contact between the leach solution and gold grains which contribute to the enhancement of gold agitation leaching. However, excessive grinding of HPGR products will moderate the advantage of HPGR comminution.

中文翻译：

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通过金矿石颗粒的微结构改性通过 HPGR 粉碎增强金搅拌浸出

摘要 对比研究了高压磨辊（HPGR）粉碎与常规颚式破碎机（JC）粉碎对金矿石搅拌浸出的影响。根据粒度分布、比表面积和平均孔体积以及微裂纹的起源和密度对 HPGR 粉碎产品进行了评估。HPGR 粉碎产生更细的颗粒，具有更大的比表面积和平均孔体积，更多的表面和内部微裂纹。结果表明，JC产品以晶内微裂纹为主，HPGR产品以晶间微裂纹为主。在最佳 HPGR 条件下（介质压力为 5.5 N/mm2），搅拌浸出过程中金金属回收率提高 6.79%–10.93%，而氰化物消耗量减少 5。82%–11.11%。这些结果表明，HPGR 产品中包含的更多和更窄的微裂纹可能会增强浸出液与金颗粒之间的接触，从而促进金搅拌浸出。但是，HPGR 产品的过度研磨会削弱 HPGR 粉碎的优势。