不同破碎方式下磨矿技术效率

Grinding technical efficiencies in various comminution modes

对高压辊磨机（HPGR）产品和圆锥破碎机（CC）产品的磨矿技术效率进行对比研究,评价不同破碎方式后的磨矿效果。相对于圆锥产品,辊压产品个别粒级分布的“双峰”特征更加明显,平均粒度较小,分布更加不均匀。辊压产品所需要的磨矿时间短、可磨性好。对于粒径小于2.0 mm全粒级给矿和粒径小于0.5 mm给矿,辊压产品的磨矿技术效率低,降低的幅度随着磨矿细度的增加而降低直至两者的磨矿技术效率相当;对于粒径在0.5～2.0mm范围给矿,辊压产品的磨矿技术效率与圆锥产品的相当甚至略高。基于此,提出一种高压辊磨机超细碎-分级磨矿新工艺,该工艺既可大幅降低一段磨机的入磨量,又可提高磨矿技术效率,减弱整体磨矿过程中的过粉碎。

In consideration of overgrinding in grinding process, the grinding technical efficiency （Et） of comminuted hematite products using a high-pressure grinding roller （HPGR） and a conventional cone crasher （CC） were comparatively studied. Compared with CC products, individual size distributions （ISDs） in HPGR product show a more significant ＂double-peak＂ characteristic. The results show that HPGR products are finer and have a wider full-size distribution because of the greater proportion of fines. HPGR products need a shorter grinding time and have a lower relative grindability. HPGR products have a lower Et at a decreasing rate than the CC product for feeds of 〈2.0 mm and 〈0.5mm size fractions, and then show a slightly higher Et for the feed of 0.5-2.0 mm size fraction. Based on the above research, a new process of ultra-crushing in HPGR - classified grinding is advanced. The new comminuting process is adopted to reduce ores tonnage into first stage ball mill significantly, improve grinding efficient and weaken overgrinding in the whole grinding process.