(福州大學紫金礦業(yè)學院，福州 350116)
摘 要: 在常規(guī)顎式破碎和高壓輥磨兩種不同破碎方式下進行細粒級金礦石的全泥氰化浸出試驗，探究兩種破碎方式對低品位金礦浸出效果的影響，并結(jié)合顆粒表面檢測結(jié)果及掃描電鏡技術(shù)，進一步研究高壓輥磨機在金礦石處理中的作用機理。結(jié)果表明：高壓輥磨機產(chǎn)品的粒度較常規(guī)顎式破碎機產(chǎn)品的更細，但分布不均勻；相同浸出條件下，粒徑小于0.15 mm的細粒級部分金浸出率提高3.7%~6.6%。兩種破碎方式產(chǎn)生的顆粒裂紋的數(shù)量和尺寸存在差異，高壓輥磨機能產(chǎn)生更加豐富的微裂紋，有助于浸出劑通過裂紋的滲透，增加顆粒的比表面積和孔隙度，有利于浸出劑與目的金礦物的接觸。同時，在理論上揭示破碎方式對金礦浸出效果影響的機制。
關(guān)鍵字: 高壓輥磨機；微裂紋；比表面積；孔隙度；全泥氰化；金礦石
（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
