March 29, 2024

Bauxite mining

Practice of bauxite mining and production abroad, just as with the main open-pit mining, mining of proof, a single dump truck straight into the ditch to open up the majority of Bauxite is an effective way to open up transport, it has invested The advantages of province, infrastructure time, fast production, and strong adaptability. Therefore, it has been widely used in open-pit aluminum mining in China. However, compared with foreign countries, the mining stripping ratio is large, the mining loss rate and the ore depletion rate are high. To non-ferrous metal industry as an example, in 1986 the national average stripping ratio of 3.74t / t, 1990 Nian increased to 9.17t / t; mining ore loss rate and dilution rate in 1986 was 7.42% and 10.85%, respectively, 1990 The year was reduced to 4.73% and 7.25% respectively. Due to the general coating thickness of bauxite deposits in China, the stripping ratio specified by the industrial indicators of the deposits is 10-15 m 3 /m 3 , and some mining design boundaries are as high as 22-25 m3/m3. According to statistics, the amount of stripping accounts for 80% to 90% of the total amount of stripping, the cost of stripping accounts for 50% to 80% of the cost of ore, and the cost of stripping costs accounts for 40% to 70%. Therefore, the transportation process is open-pit of bauxite. The key to mining.
At present, there are not many underground mining mines in China, which are in the experimental stage. For example, Shandong generally adopts the longwall collapse method or the short wall subsidence method, while Guizhou adopts the stratified caving method or the retention method. The mining ratio is generally 200 to 300 m / 10,000 t. Since many of China's bauxite resources require underground mining and are mostly difficult to mine, research on strengthening underground mining methods is imperative.

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