酒钢镜铁山铁矿分级预选试验研究与产业化应用

Experimental Study and Industrial Application of Iron Mine Classification and Pre-selection in Jingtieshan of Jiugang

酒钢镜铁山桦树沟V矿体矿石品位低,脉石与铁矿物嵌布、连生关系密切,混杂有废石的矿石直接送至选厂处理存在生产成本高、破坏桦树沟不同采场采掘平衡等一系列问题。为了解决这些问题,采用分级分选工艺开展了大、小块矿预选抛废试验。结果表明:15~3 mm和30~15 mm粒级均采用2次强磁预选抛废,15~3 mm粒级抛废率24.50%、废石铁品位4.75%、精矿铁品位29.64%、精矿铁作业回收率95.06%,30~15 mm粒级抛废率20.88%、废石铁品位9.84%、精矿铁品位27.40%、精矿铁作业回收率92.61%,铁品位分别提高6.10和3.67个百分点;100~30 mm粒级采用X射线智能预选抛废,作业抛废率20.68%、废石铁品位12.55%、精矿铁作业回收率89.15%,铁品位提高了2.96个百分点。基于系统的试验,现场建成了年处理115万t矿石的组合预选生产线,较好地解决了现场的问题。该项目的成功对弱磁性难选铁矿石的高效预选抛废具有示范作用。

The ore grade of Huashugou V ore body in Jingtieshan of Jiugang is low,and the gangue is closely related to the dissemination and intergrowth of iron minerals.If the ore mixed with waste rock is directly sent to the beneficiation plant for treatment,it will produce a series of problems such as high production cost and damage to the mining balance of different stopes in Huashugou.In order to solve these problems,the classification separation process was used to carry out the pre-selection and discarding test of large and small ore blocks.The results show that both 15~3 mm and 30~15 mm size fractions are discarded by two times of high intensity magnetic pre-selection.The discarding rate of 15~3 mm size fraction is 24.50%,the iron grade of waste rock is 4.75%,the iron grade of concentrate is 29.64%,and the iron operation recovery rate of concentrate is 95.06%.The discarding rate of 30~15 mm size fraction is 20.88%,the iron grade of waste rock is 9.84%,the iron grade of concentrate is 27.40%,and the iron operation recovery rate of concentrate is 92.61%.The iron grade is raised by 6.10 and 3.67 percentage points respectively.The 100~30 mm particle size is discarded by X-ray intelligent pre-selection.The operation discarding rate is 20.68%,the iron grade of waste rock is 12.55%,the iron operation recovery rate of concentrate is 89.15%,and the iron grade is raised by 2.96 percentage points.Based on the system test,a pre-selection production line for processing 1.15 million tons of ore per year was built on site,which well solved the problem on site.The success of this project has an exemplary role in the efficient pre-selection and discarding of feebly magnetic refractory iron ore.