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.
Animals Puzzle Mat is a educational puzzle mat, a learning tool, and a cushioned play area all rolled into one. The different animals shapes pop out to teach basic animal and color recognition; and the cushioned pieces provide a soft play area, making it perfect for playrooms, nurseries, classrooms, gyms, and more. Made of easy-to-clean EVA foam, the squares stack nicely together for easy transport.
Interchangeable pieces allow kids to develop gross motor skills, hand-eye coordination, and visual sensory growth, large, cushioned, and colorful puzzle pieces are very safe, not only for your children but they also protect your floors against damage.
Animals Puzzle Mat,Eva Puzzle Animal Mat,Baby Animal Puzzle Mat,Puzzle Mat For Kids,Multi Coloured Puzzle Mat,Puzzle Animal Play Mat
Huizhou City Melors Plastic Products Co., Limited , https://www.melorsfloor.com