高压辊磨超细碎在贫磁铁矿石预选中的应用

Application of Ultra-finely Crushing by High Pressure Grinding Rolls in Pre-concentration of Lean Magnetite Ore

从高压辊磨机的工作原理及粉碎产品特性出发,分析了高压辊磨超细碎在贫磁铁矿石预选工艺中的作用。高压辊磨机特有的层压粉碎方式使其粉碎产品具有细粒级含量高、微裂纹发育充分、解离特性好等特点。高压辊磨超细碎—预选工艺能够在贫磁铁矿石入磨前抛除大量合格尾矿,减少入磨量,提高入磨品位,降低矿石的Bond球磨功指数,提高选别效率,有利于实现节能降耗。指出今后应加强高压辊磨设备与矿石性质及生产工艺的适应性研究,发展高效、低耗的新型辊磨设备,高压辊磨机与先进的预选设备配合使用时效果更好,因此针对高压辊磨产品的特性,研发配套的先进预选设备,对提高高压辊磨超细碎—预选指标具有重要意义。

Based on the working principle and product characteristics of High Pressure Grinding Rolls(HPGR),the role of ultra-finely crushing by HPGR in the process of lean magnetite ore crushing were analyzed. The special laminating and crushing method of HPGR makes the crushed product have the characteristics of high content of fine-grained particles, sufficient development of micro-cracks and good dissociation characteristics. Ultra-finely crushing by HPGR-pre-concentration process can throw a large amount of tailings to improve the grade before lean magnetite ore enter into the mill. The efficiency of separation is improved by reducing the amount of grinding and reducing the Bond work index of ore, which is conducive to energy saving. In the future, the adaptability of HPGR equipment to ore properties and production process should be strengthened, a new type of HPGR equipment with high efficiency and low consumption should be developed. The process has better indicators when HPGR was used in conjunction with advanced pre-concentration equipment. The development of matching advanced pre-concentration equipment for the characteristics of HPGR products which have great significance for improving the index of ultra-finely crushing by HPGR-pre-concentration process.