Opening up and Innovation
Mineral resources are an irreplaceable material basis for Chinas sustainable economic and social development. Currently, China is still under a rapid development stage of industrialization and urbanization, when rigid demands for resources continue to stay at a high level. However, China is stuck in poor resource endowment and resource shortages and thus increasingly reliant on imports of bulk minerals, which has seriously threatened the nations economic security. In recent years, Chinas reliance on imports of iron ores has exceeded 80%, which has threatened the national strategic security and aroused wide concern among all quarters of society. In order to enhance Chinas self-supply capacity of iron ores, in recent years, the country has made every effort to develop and utilize a lot of low grade iron ore resources that are difficult to be processed, of which the ultra-poor iron ore resource is a very typical one.
From 2021 to 2022, the ores in the stripping direction of the mining area of the subsidiary Jindi Mining was continuous but with a low grade, with an average grade of 0.0507% throughout the year. In order to guarantee the economic benefits, the grade of withdrawal of ore has to be raised to 0.0597% and the cutoff grade has to be controlled at 0.040%. For this purpose, the low grade ores in the due east must be stripped, which has increased the mining cost. If the low grade ores are mined by the cutoff grade of 0.030%, the stripping ratio will be lowered and the mining cost will be reduced greatly. They must be removed as soon as possible in the beneficiation process to reduce the grinding-flotation cost. In sum, the cost of Jindis molybdenum concentrate is relatively high and its profitability is relatively low, with a weak risk resistance capacity. Therefore, the dry separation and removal process is introduced into the ore crushing process to concentrate the grade of crude ore and lower the mined ore grade.