English name ion-absorbingtyperare earthsore Ion-adsorbed rare earth ores are mainly distributed in Jiangxi, Guangdong, Hunan, Guangxi, Fujian and other places in China. At present, there are two extraction methods for ionic rare earth ore. (1) Extraction of rare earth from ion-adsorbed ore with NaCl The use of NaCl is currently one of the main chemical beneficiation methods for the treatment of this type of ore. The ore from the mining site is fed into a rectangular cement pond for immersion, and the leachate is discharged from the discharge port through the filtration layer at the bottom of the tank. After removal, the leachate is precipitated in a saturated oxalic acid solution, filtered, and the filtrate is neutralized by lime and added with salt to be returned for reuse; the filter cake is a rare earth oxalate, which is burned, washed with water, and then calcined to obtain a mixed rare earth oxide. . The main problem currently existing in this process is that the leaching residue contains high NaCl and causes soil salinization. (2) Ammonium sulfate method The extraction of rare earth from ion-adsorbed ore with (NH4)2SO4 is a successful method in recent years. The difference from the NaCl method is that the ore is obtained by soaking the ore with 1%~2% of (N H4) 2 SO, followed by precipitation with oxalic acid, and then obtaining REO>90% by one burning. The mixed rare earth oxides are returned to the filtrate by adding sulfuric acid. Compared with the NaCl method, the leaching residue does not cause the problem of salinization in the upper soil. Chin Assist Machine,Lateral Row Trainer,Back Muscle Exercise Fitness Equipment,Back Tensile Machine,Dumbbell Stand Xuzhou Hongxing Gym Equipment Co., Ltd , https://www.hxygym.com
Detailed extraction method of ionic rare earth ore
Ion-adsorbed rare earth ores, also known as weathering crust-leaved rare earth ores, were first discovered in Longnan Foot Cave in Jiangxi Province in the late 1960s, and later found in Nanling areas such as Fujian, Hunan, Guangdong, and Guangxi, but in Jiangxi. More concentrated and large. Ion-adsorbed rare earth ore is a unique new type of rare earth deposit in China that has not been reported abroad. After several decades of research, it has been found that this type of mine has a wide distribution of ground, large reserves, low radioactivity, easy mining, simple process of extracting rare earth, low cost and good product quality.
There are various types of back muscle fitness equipment, including but not limited to back tension machines, rowing machines, dumbbells and barbells, back stretchers, etc. These devices each have their own characteristics and can be used to exercise different muscle groups in the back, such as latissimus dorsi, trapezius, shoulder and back muscles, thereby comprehensively improving the strength and stability of the back.
1. Back tension machine: It can exercise different muscle groups on the back, such as latissimus dorsi, trapezius, etc. By adjusting the seat and handle, diversified tension training can be carried out at different angles and postures, effectively exercising the width and thickness of the back.
2. Rowing machine: It has a good training effect on the muscles of the back, shoulders, and arms. By adjusting the gear and posture, it can simulate rowing movements, strengthen the strength and endurance of the back and core muscles, and improve cardiovascular function.
3. Dumbbell and barbell exercises: Through different dumbbell and barbell movements, targeted exercises can be performed on the back muscles, such as dumbbell rowing, hard pulling, and flat rowing, to help enhance the strength and stability of the latissimus dorsi and trapezius muscles.
4. Back Stretcher: In addition to exercising the strength of the back muscles, stretching is also an important part of maintaining back health and maintaining correct posture. By doing stretching exercises, one can stretch the back muscles, relieve tension, and promote blood circulation, which helps prevent back pain and injuries.
When using these devices, it is important to maintain the correct posture and movements, and gradually increase the weight and difficulty to gradually improve the strength and endurance of the back muscles. By implementing a reasonable training plan and using it correctly, the strength, definition, and flexibility of the back can be effectively improved.