Bauxite environmental protection

Because if the bauxite mine open pit mining, and more occupied land, the impact is large, and therefore, how to reduce mine land reclamation by protecting the environment is a very prominent problem. Let's take the example of the Xiaoyan aluminum mine in Shanxi, the largest open-pit aluminum mine in China, to illustrate the progress of bauxite mining in the recovery and reclamation.
Shanxi Xiaoyi Aluminum Mine Design Scale: The total annual output of bauxite ore is 2.15 million tons, and the total amount of stripping and stripping reaches 173,000 tons. Design covers an area of 1158.2 hm ^2, as of 1995, has a total land 721hm ^2, the future mine production and construction stages to be acquired land there 433.3hm ^2. Due to the sharp decline in the land adjacent to the village in recent years, and the sharp increase in land acquisition fees, it has brought unbearable pressure and heavy burden to mine production and the neighboring village life.
In order to solve this problem, Xiaoyi Aluminum Mine adopts a new technology of reclamation-mining-recycling integration to realize side mining, reclamation, minimizing re-transport with minimum investment, and obtaining a virtuous cycle of mine land reclamation. . Through two years of practice, the Xihedi mining area of ​​the mine can be reclaimed in the early stages of mining. According to the overall scale of land reclamation that has been examined and approved, it is expected that the mining area will be completed, and the reclamation rate will reach 75%, totaling 543.3 hm ² of reclaimed land, of which 471 hm ^{2 is} reclaimed cultivated land.
In order to effectively save cultivated land and effectively protect cultivated land, and give full play to the effectiveness of reclamation of cultivated land, the relevant departments have implemented the policy of “land exchange for land” and temporary land use. At present, the mine has reached the same level with the Xia Zhuang and Kezhe Village Committees to exchange the same amount of mine land with 2.67 hm ^{2 of} reclaimed arable land. This not only effectively inhibits the reduction of cultivated land in the mining area, but also the fragmented pieces of the villagers in the mining area. The land can be effectively turned into a “small plain” in the mountains through the reclamation of the mine, and the quality of cultivated land and water and soil conditions can be fundamentally improved. The mining enterprises can save a total of 57.76 million yuan in land costs by using the reclaimed cultivated land and the mine production land interchange.
The social benefits, environmental benefits and economic benefits of Xiaoyi Aluminum Mine through the integration of stripping-mining-recovering are very huge. The promotion of this technology has opened up a new new project for saving farmland and protecting the ecological environment in bauxite mining in China. Road, providing valuable experience.
In the process of electrolytic aluminum production, some fluoride is produced, which pollutes the environment and is also an urgent problem to be solved in the aluminum industry. At present, more than 70% of China's aluminum electrolysis cells are self-baked anode electrolyzers. Most of these self-baking tanks are not equipped with environmental protection facilities to eliminate harmful gases such as fluoride. The chimneys are used for high-altitude emissions, and some small aluminum plants even have high-altitude emission measures. Not used, the aluminum factory workers work in the harsh environment filled with fluoride and asphalt smoke, and a large amount of fluoride is discharged into the air, which pollutes the surrounding environment. In order to change this situation, we should first promote the dry anode paste technology, vigorously carry out the research and popularization and application of dry purification of flue gas, and at the same time, we must pay close attention to environmental protection facilities and strengthen the "three wastes" treatment to reduce environmental pollution.

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