China's lead and zinc plants are mostly small and medium-sized enterprises. In all parts of the country, the ore dressing method is basically flotation, and its tailings have the following characteristics.
China's lead-zinc mines have lower grades of ore. According to statistics, the average grade of lead-zinc mines produced in China is about 1/3 lower than that of foreign countries. In recent years, due to the development of comprehensive recycling technology, the most useful recycling has been achieved. However, in general, due to the low grade of ore, the yield of tailings is relatively high. The statistics of more than 20 key lead and zinc plants in China indicate that the tailings of China's lead and zinc plant mainly account for 70% of the ore processing. the above.
The concentration of tailings in China's lead and zinc plant is generally 15 intestine - 25%, so such a low concentration of tailings transports or deposits the dam, resulting in high energy consumption.
The tailings discharged from China's lead and zinc plant are quite different and can be basically divided into the following categories:
1 fine ore tailings. This is the most common type of lead-zinc mine in China. The main feature is that the tailings are less than 0.02mm, accounting for 20%-50%, such as the factory dam lead and zinc.
2 sand tailings. Such tailings have a relatively coarse particle size (such as Panjiachong lead-zinc mine, etc.), tailings with a particle size of less than 0.02 mm account for about 20%, and less than 0.1 mm account for more than 75%.
3 slime tailings. This kind of tailings contains large mud, which is more common in lead-zinc mines, and the particle size is less than 0.02mm, accounting for more than 50%.
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