With the development of a large number of the world's mineral resources, increasing the amount of ore mining, ore
metal content declining. In order to ensure the stable production of metal production and meet the needs of the national economy in non-ferrous metals, intensive mining has been carried out to mix a large number of surrounding rocks and gangue minerals into the ore, thereby depleting the raw ore out of the ore. In order to reduce the
beneficiation ratio and beneficiation cost, and reduce the cost of grinding and ore dressing, the ore must be pre-enriched before it enters the grinding operation, and some of the waste rock is discarded.
In recent years, due to the lack of mining methods for some difficult mining beds in China, the loss of resources is serious, the mining loss rate is as high as 30%, and the depletion rate is as high as 30%. According to the current amount of ore mined and the level of depletion rate reached in history, the number of waste rock is 2 to 3 million tons, and the amount of metal is 1 to 15,000 tons. The cost of mineral processing is more than 20 million yuan.
As the demand for mineral raw materials in the national economy continues to grow, it is necessary to develop low-grade lean ore, mechanization of mine work and high mining production systems, which further lead to the depletion of ore. It is inevitable to reduce the content of useful components in the ore. To solve the above problems, there are two directions:
First, the technically selected plants use high-capacity, large-scale equipment to replace existing equipment.
Second, the process is perfected and the beneficiation process adapted to low grade ore is adopted. First of all, try to reduce the most difficult part of the plant selection - the amount of grinding. The use of ore pre-selection can improve the preparation of ore and prevent a large amount of surrounding rock and waste rock from entering the crushing, grinding and sorting operations, thus saving energy.
Lead Zinc Ore abroad most widely used method is preselected heavy medium beneficiation, followed jig; other preselected methods (e.g., fluorescence γ- dressing, etc.) are being investigated. However, China's pre-selection is rarely applied, and it is a weak link.
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