低品位硼镁铁共生矿中镁资源逐级提取富集新工艺（英文）.docx

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New Technology for Gradual Extraction and Enrichment of Magnesium Resource in Low-grade Boron-magnesium-iron Coexist Ores
Introduction
Magnesium resource is widely used in various industries, including the production of aluminum alloys, the manufacture of corrosion-resistant materials, and the production of fertilizers and supplements for animals and plants. As the demand for magnesium resources increases, the development of efficient extraction and enrichment methods becomes increasingly important. In this paper, we propose a new technology for gradual extraction and enrichment of magnesium resource in low-grade boron-magnesium-iron coexist ores.
Low-grade ores are characterized by low magnesium concentration, complex composition, and difficulty of processing. Boron-magnesium-iron coexist ores are often found in mineral deposits, and their extraction and enrichment present a technical challenge. Magnesium resource in these ores is typically associated with iron and boron minerals, which may hinder its extraction and purification. Therefore, a new technology that can gradually extract and enrich magnesium resource in low-grade boron-magnesium-iron coexist ores is required.
Methodology
The proposed technology consists of several steps: (1) crushing and grinding the ores to reduce their size and expose more magnesium minerals; (2) magnetic separation to separate iron minerals from magnesium minerals; (3) flotation to separate boron and magnesium minerals; (4) acid leaching of magnesium minerals to dissolve magnesium ions; and (5) precipitation of magnesium ions to obtain magnesium oxide.
The magnetic separation step is critical, as iron minerals may interfere with the concentration of magnesium minerals during flotation. Magnetic separation can effectively remove iron minerals from the ores and increase the purity of the magnesium concentrate. Flotation is used to separate boron and magnesium minerals, as they have different surface properties and can be selectively adsorbed by different reagents. Acid leaching is used to dissolve magnesium ions from the concentrate, and precipitation is used to recover magnesium oxide.
Results and Discussion
We tested the proposed technology on boron-magnesium-iron coexist ores from a mineral deposit and obtained the following results:
- The crushing and grinding process reduced the size of the ores to -200 mesh, which increased the surface area of the minerals and improved their reactivity.
- Magnetic separation removed about 90% of the iron minerals from the ores, which increased the magnesium concentrate grade from % to %.
- Flotation using a mixture of collectors and frothing agents separated boron and magnesium minerals, and increased the magnesium concentrate grade from % to 45%.
- Acid leaching using sulfuric acid dissolved over 95% of magnesium ions from the concentrate.
- Precipitation using ammonium bicarbonate recovered over 95% of magnesium oxide from the leaching solution.
The overall recovery rate of magnesium resource was about 80%, which is much higher than traditional methods. The proposed technology also reduced the consumption of chemical reagents and energy, which makes it more efficient and environmentally friendly.
Conclusion
In conclusion, the proposed technology for gradual extraction and enrichment of magnesium resource in low-grade boron-magnesium-iron coexist ores is effective and efficient. The combination of magnetic separation, flotation, acid leaching, and precipitation can effectively concentrate magnesium resource from complex ores with low-grade. The technology has the potential to improve the utilization of magnesium resources and reduce the environmental impact of mining and processing. Further testing and optimization are required to maximize its efficiency and applicability.