PDF
Full
Outline
Bauxite resources in China are predominantly sedimentary diasporic ores, characterized by well-developed clay minerals and the fine-grained intergrowth of aluminum-bearing minerals with siliceous gangue. These ores typically have high silica content and a low Al/Si ratio, making them unsuitable for direct processing by the Bayer method. With the depletion of high-grade resources, efficient desilication and beneficiation of low-grade bauxite have become essential for ensuring the security of the alumina industry. This paper systematically reviews desilication technologies for low-grade bauxite. It analyzes the distribution of bauxite resources and the characteristics of the ores, and further clarifies the constraints imposed by mineralogical features and mineral intergrowth on beneficiation performance. The review focuses on physical beneficiation methods, including gravity separation and flotation, as well as chemical methods, microwave activation, and the calcification-carbonation process. Their desilication efficiency, economic cost, and environmental impact are comparatively evaluated. Flotation remains the dominant technology, but its selectivity is significantly reduced by fine-grained mineral intergrowth. Chemical methods and energy-assisted techniques can help overcome the limitations of mineral liberation, but they are often associated with high energy consumption and complex process flows. The calcification-carbonation process integrates desilication with red mud valorization, representing a promising pathway for green metallurgy. Finally, desilication technologies should be tailored to differences in mineralogical characteristics. Process selection should move beyond a single-indicator criterion toward a comprehensive evaluation of energy efficiency, silica transformation pathways, and solid-waste properties. This approach will promote the efficient, green, and high-value utilization of high-silica bauxite.
PDF
75
27
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
