Red mud is a polluting industrial waste residue produced by bauxite in the process of producing alumina. It is red, dark red or gray mud-like due to different iron oxide contents. It has high water content and contains harmful components such as alkali and heavy metals. become a chronic disease affecting the ecological environment. The main components of red mud are SiO2, Al2O3, CaO, Fe2O3, etc., and contain a large amount of alkaline chemicals. The pH value can reach above 11, which is strongly alkaline. As my country’s high-grade bauxite becomes less and less, the amount of red mud discharged from the production of 1 ton of alumina can reach 1.5-2 tons.
According to data from the National Bureau of Statistics, China’s alumina output in 2021 will be 77.475 million tons, a year-on-year increase of 5.0%. If calculated based on the emission of 1.5 tons of red mud per ton of alumina, the emission of red mud in 2021 alone will be as high as about 100 million tons, and the comprehensive utilization rate of red mud in my country is only 7%. The accumulation of red mud not only occupies land resources If it is not properly managed, it will also bring risks such as dam failure of the red mud reservoir, soil and water pollution, etc. Therefore, it is urgent to maximize the utilization of red mud.
Red mud often contains a variety of valuable metals, mainly including iron, aluminum, titanium, vanadium, etc., which can be recycled as potential resources. The mass fraction of Fe2O3 in Bayer process red mud is generally above 30%, which is the main chemical component of red mud.In recent years, Huate Company has been continuously conducting research and research on red mud separation, and has developed a complete set of technology for the separation of red mud iron and fine powder. , 40% to 50% of iron minerals in red mud can be recovered through a weak magnetic and two strong magnetic beneficiation process, and large-scale industrial applications have been carried out in Shandong, Guangxi, Guizhou, Yunnan and other regions. Indicators are good. The recovery of valuable metals in red mud can not only create economic benefits, but also save resources and reduce environmental pressure.
Oil-water composite cooling vertical ring high gradient magnetic separator
The “Implementation Plan for Accelerating the Promotion of Comprehensive Utilization of Industrial Resources” recently issued by eight departments including the Ministry of Industry and Information Technology and the Ministry of Ecology and Environment put forward clear requirements for the comprehensive utilization rate of bulk industrial solid waste during the “14th Five-Year Plan” period. However, for the comprehensive utilization of red mud, only “Effective improvement” is required. This is because the chemical alkali combined with red mud is difficult to remove and the content is large, and it also contains fluorine, aluminum and other impurities. The harmless utilization of red mud has always been difficult to carry out, so the comprehensive utilization of red mud is still a worldwide problem. . Call on relevant scientific research units to continue in-depth research in combination with the existing red mud comprehensive utilization technology to maximize the comprehensive utilization of red mud resources.
Wet drum magnetic separator
Cylindrical screen
Applications
A red mud iron separation project in Shandong – This project treats alumina red mud, using 22 LHGC-2000 vertical ring high gradient magnetic separators, which effectively solves the problem of red mud treatment and comprehensive utilization.
Vertical ring high gradient magnetic separator applied to a red mud iron separation project in Guangxi
Vertical ring high gradient magnetic separator applied to a red mud iron separation project in Shandong
Vertical ring high gradient magnetic separator applied to Yunnan red mud iron separation project
Vertical ring high gradient magnetic separator applied to a red mud iron separation project in Shanxi
Vertical ring high gradient magnetic separator applied to a red mud iron separation project in Guangxi
Post time: Mar-25-2022