落重试验测定矿石粉碎特性参数

为了科学、准确地进行碎磨设备选型,并确定合理的碎磨工艺流程,对国际上较盛行的自磨/半自磨工艺中物料粉碎特性参数的测定方法——JKTech落重试验法进行了系统介绍,在此基础上,采用JK落重试验仪和磨蚀粉碎试验设备,测定了承德某铁矿3个矿样的冲击粉碎参数A和b以及磨蚀粉碎参数Ta。将试验结果与数据库数据比较,可以得出:13个矿样的粉碎特性十分接近,都属于软-中软矿石。2矿样在破碎能为2.5、1.0 kWh/t时,颗粒的抗冲击破碎能力随颗粒粒度的增大而下降,且破碎能越大颗粒抗冲击破碎的能力下降越显著;当比破碎能为0.25kWh/t时,颗粒的抗冲击破碎能力随颗粒粒度的增大而上升,即随比破碎能下降,颗粒粒度-t10关系曲线的斜率变小。3试验结果可以成功用于磨机与破碎机处理量和能耗的计算以及自磨/半自磨流程设计和模拟计算。因此,JKTech落重试验所测得的粉碎特性参数不仅可以判断矿石性质,也可作为设备选型和流程确定的依据。

Comminution Parameters Detection of the Ore by Drop-weight Tests

In order to make the selection of comminution equipments and process more accurately and reasonably，the popular material comminution properties measured methods in AG/SAG operation at abroad：the JKTech Drop-weight Test method was introduced systemically.The comminution properties that are the impact parameter A and b as well as abrasion parameter T_a in Chengde Iron Ore are determined by using JK Drop-weight Tester and abrasive grinding testing device.By comparing the test results with the data in database，it can be seen that ①the three samples' comminution properties are similar with each other，which meant all the sample belong to the soft and middle-soft ore.②with the crushing energy of 2.5，1.0 kWh/t，the impact resistance decrease with the increase of the particle size.The more the crushing energy is，the more significant the impact resistance decreases.With the specific crushing energy of 0.25 kWh/h，the impact resistance increase with the increase of the particle size.It means that the impact resistance decrease with the specific crushing energy，and the curve slope of t₁₀ & particle size becomes less.③The test results can be successfully applied into calculation of throughput and energy consumption，as well as AG/SAG flow-sheet design and simulation.It indicated that comminution properties by JKTech Drop-Weight Test could not only measure the ore properties，but also lay the foundation for equipment selection and flow-sheet determination.