Panzhihua Ilmenite Microwave-assisted Finely Ground Test Research

It is generally believed that the size reduction of ores is an energy-intensive and highly inefficient process. The researchers have done many works in order to reduce the energy consumption and improve the energy efficiency. Panzhihua ilmenite resources are rich in Ti and Fe, which contain many associated minerals such as Vanadium, chromium, nickel, cobalt and platinum and so on. Both of them are important to use value. However, it has great difficulty for the traditional process of crushing and grinding because of the complex mineral composition and structural characteristics. Therefore, in order to reduce the energy consumption of grinding process and improve the quality of grinding products, it is great significance to search for a new technical approach for the pretreatment of the Panzhihua ilmenite.In this study, in connection of the composition and structural characteristics and resource utilization status of Panzhihua ilmenite and under the premise of a wide range access to paper information at home and abroad, microwave heating has been application in ore's pretreatment. The efficiency of ore grinding and subsequent recovery of magnetite magnetic effects by microwave pretreatment was inspected. To a certain extent, the mechanism of microwave-assisted grinding and the main factors that affect the effects of microwave pretreatment have been researched. The research provides a new effective pretreatment technical for the utilization of the mineral resources in the region.In the first place, the paper analyzes the chemical composition of the selected ore. According to the testing, the main ore minerals magnetite and ilmenite have good microwave absorption properties. In the experiment, the SEM (EDS), XRD and particle size analysis are used of analyzing the test results. And the change in the -200 Mesh of mineral grinding and the recovery rate of magnetite magnetic separation are regarded as pretreatment evaluation index. So, the main factors that affect the ore's heated temperature and the grinding effects are determined, which contains microwave power, microwave heating time, the weight of ore samples, mineral sample size, etc. These factors also have a significant impact on the magnetic separation of magnetite and the quality of recycling product.Research indicates that, the ore can be heated to above 300℃on condition that Mine-like is 50g, the microwave power is 1kW and the heating time is 30s. And the heating rate increases with the microwave power level and heating time increased. However, in the rated microwave power 1kW and heating time 30s, the ore can achieve the maximum heating temperature when the mass load is arrange from 40g to 60g and particle size of sample is 20-30mm.By the microwave heating pretreatment, the mineral liberation efficiency is improved by creating intergranular fracture on the ore and gangue grain boundaries, and the composition of ore has not been changed in the pretreatment. This study found that, although the higher power level, the better pretreatment efficiency, the handling capacity should couple with the power level so as to satisfying the grinding requirements without increasing the energy consumption. Although the extension of microwave heating time can raise the ore's temperature, its grinding effect shows a declining trend. So this study identified the optimum heating time is 30s. On the conditions of rated microwave power level and heating time, when the mineral samples in the weight of 50g and particle size is 20-30mm, the highest heating temperature and the best grinding results would be achieved. Thus, on the optimum conditions that particle size is 20-30mm, mass load is 50g and heating time is 30s, the content of-200 Mesh can ascend to 94% when the power level is 1kW, compared with untreated ore increased 28%.According to the magnetic separation of magnetite, it is found that microwave pretreatment can significantly improve the recovery rate of magnetite. And the quality of recovery products also enhanced. When the microwave power level is 3kW, the recovery rate raise to 72%, compared with the untreated ore is 44%. On the conditions of the various power, the quality of recycling magnetite enhanced 6-8% than the untreated one (which quality is 50.2%).The result of this paper shows that, the efficiency of ore grinding can be significantly improved by utilizing microwave treated the Panzhihua ilmenite. And improve the magnetite recovery rate and the quality of recovery product effectively. To conclude, the main purpose of this research project and meaning is achieved. But also provides an effective new technique for the comprehensive utilization of mineral resources in Panzhihua region.