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.
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.
The fitness equipment for chest exercises has diverse characteristics and can meet different training needs and goals.
1. Barbell bench press is one of the most common training exercises for chest muscles, mainly training the pectoralis major, shoulders, and triceps. When using a barbell push, it is important to maintain a straight back and stable shoulder blades, avoid excessive use of shoulder and arm strength, and adjust the weight and frequency of the barbell to suit your level of ability.
2. Dumbbell bench press is another common exercise for training chest muscles, which places more emphasis on the stability and balance of the chest muscles compared to barbell bench press. When using dumbbell push, it is necessary to maintain the stability of the arms and try to keep the movements of both arms consistent. A smaller weight can be used for dumbbell push to improve stability and grip.
3. A chest stretcher is a device specifically designed to train chest muscles, which can be adjusted to different body shapes and training needs by adjusting the position of the seat and handle. The advantage of chest thrusters is that they can more effectively isolate and stimulate the pectoralis major muscle while reducing the impact on other muscle groups.
4. A fitness ball is a multifunctional equipment that can be used for various training exercises, including chest training. By performing exercises such as bench presses and push ups on the fitness ball, the challenge and stability requirements for the chest muscles can be increased.
5. The pull-up device is used to exercise upper body muscles, including chest muscles. By performing pull ups, the development of chest muscles can be effectively stimulated. When using the pull-up device, it is important to maintain correct posture and movements, avoid shaking and excessive use of arm strength.
In addition, other equipment such as butterfly machines, fitness ropes, barbells, and flying birds can also be used for chest exercises. No matter which equipment is chosen, the key is to maintain correct movements and postures, grasp appropriate weight and frequency to avoid injury and achieve the best training results
Incline Chest Press Equipment,Bench press chest Trainer,High pull&Low Pull Machine,Pectoral fly training,Olympic Bench
Xuzhou Hongxing Gym Equipment Co., Ltd , https://www.ailimeifitness.com