Construction Hoist (also called Building Hoist, Passenger Hoist, Construction Material Hoist, Construction Passenger Hoist) are an efficient and safe means of transporting people and materials on construction site. They help increase productivity and safety, thereby saving time and money.
Construction hoist is vertical transport machinery driving by pinion and rack, mainly used on construction site for transportation of personal and materials. As a permanent or sub-permanent external elevator, it also applies to store house, dock, high tower, high chimney, etc. There are single cage and double cages hoist. According to the need gets rid of one cage of double cages the hoist will be changed to single cage hoist. SC construction hoist is equipped with reliable electrical and mechanical safety device. It is efficient and safety vertical transporting equipment.
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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.
Overview of pre-selection of lead-zinc ore
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.