不同破碎方式对鞍山式赤铁矿石磨矿特性的影响

高压辊磨破碎是基于料层粉碎的一种新型破碎方式，不仅本作业破碎效率高、能耗低、粉矿量大，而且破碎产品颗粒内部丰富的微裂纹也有利于后续磨矿作业节能。为了定量评价高压辊磨破碎对后续磨矿的影响，以鞍山式某赤铁矿石为试样，进行了磨矿技术效率和Bond球磨功指数试验。结果表明：由于高压辊磨产品中小于指定粒度（-0.074 mm）的物料产率明显较高，因而在较粗磨矿细度下，高压辊磨产品的磨矿技术效率均略低于颚式破碎产品，但随着磨矿细度的提高，二者的差距越来越小，当-0.074 mm占85%时，二者的磨矿技术效率相当，超过该磨矿细度，则磨矿效率开始小幅反超；目标粒度为280、150、105、74 μm时，高压辊磨产品的Bond球磨功指数比颚式破碎产品分别低9.41%、7.70%、4.97%和4.28%，降低的幅度随目标粒度的降低而减小，表明高压辊磨破碎对一段磨矿有显著的节能效果。

Effect of Different Broken Way on Grinding Characteristics of Anshan-type Hematite

High pressure grinding roll (HPGR) is a new crushing method designed on the laminated grinding.It has characteristics of high crushing efficiency，low energy consumption，more amount of fine grains，and the subsequent micro-crack within the crushed product is benefit for save energy during the followed grinding operation.Taking an Anshan type hematite ore as the sample，experiments on grinding technology efficiency and bond work index of ball mill were conducted in order to quantitatively evaluate the energy saving effect of HPGR crushing on subsequent grinding operation.The results showed that in the coarse grinding fineness range，the grinding technology efficiency of HPGR products was slightly lower than that of the jaw crusher (JC)，which resulted from HPGR products have a slightly higher yield rate of specified size (-0.074 mm).However，the gap decreased as the grinding fineness increases，and the two grinding technology efficiency was quite the same at the grinding fineness of 85% passing 0.074 mm,as the grinding finess getting finer,the grinding technodogy efficiency began to come back slightly.When the target size of 280，150，105，74 μm，the Bond work index of HPGR products lowered by 9.41%，7.70%，4.97% and 4.28% than that of JC，thus the decrease range is lowered with the target size decreased.It is indicated that HPGR crushing has significant energy saving effect on primary grinding operation.