Advanced technology allows middle-low grade bauxite to change from "poor" to "rich"

The lack of high-grade bauxite or low-grade bauxite is a major bottleneck restricting the healthy and sustainable development of China's aluminum industry. Is there a "prescription" for making low-grade bauxite from "poor" to "rich" and successfully used it? After many years of technological research, the Institute of Mineral Resources of the Chinese Academy of Geological Sciences has finally turned this dream into a reality.

During its research and implementation of the low-grade ore utilization ore dressing technology research project, the organization conducted research on the low-grade bauxite ore in the Nanchuan and Wulong areas of Chongqing City and conducted a process mineralogy study on the properties of such refractory ores. And comprehensive utilization of process technology research. Through experimental research, the Institute of Comprehensive Utilization of Minerals of the Chinese Academy of Geological Sciences has developed a comprehensive utilization technology suitable for the characteristics of the ore, providing technical support for the development and utilization of such low-grade bauxite.

They conducted multi-process and multi-project screening tests and adopted selective grinding-coarse-grain grading-positive flotation process to achieve the best technical indicators. The small closed circuit test obtained a technical index that the ratio of aluminum to silicon in the concentrate was 8.23 ​​and the recovery rate was 91.42%.

The project recommended selective grinding - coarse-grain grading - positive flotation process is suitable for the process technology of low-grade bauxite beneficiation in Chongqing. The process realizes the pre-recovery of coarse-grained assemblages. Through the grading process after re-grinding, the intermediate and fine-grained target minerals are fully dissociated, and the positive flotation process is used to strengthen the recovery of fine-grained products and ensure the concentrate products. Recovery rate.

According to the technical personnel of the research group of the Institute, the technology is easy to implement, with the advantages of equipment investment, simple process structure, low ore processing cost, and environmental protection economy, which can be promoted and applied in the development and utilization of similar low-grade bauxite ore.