What is the working principle of coal washing equipment?
Working principle of main equipment: pressureless three-product cyclone: cyclone is a device that uses fluid pressure to produce rotary motion. When the slurry enters the cyclone at a certain speed, it is forced to rotate when it meets the wall of the cyclone. Due to the different centrifugal forces, the solid coarse particles in the slurry are subjected to a larger centrifugal force, which can overcome the hydraulic resistance and move to the device wall, and under the same action of their own gravity, they move downward along the device wall, while the fine particles and most of the water rotate with the slurry because of the smaller centrifugal force. Driven by the subsequent feeding, the slurry continues to rotate downward, so the coarse particles continue to concentrate around, while the fine particles stay in the central area, and the particle size becomes larger and larger from the center to the wall, forming a layered arrangement. As the slurry flows from the cylindrical part of the cyclone to the conical part, the flow cross section becomes smaller and smaller. Under the compression of the external slurry, the internal slurry containing a large number of fine particles had to change its surface direction and move upward to form an internal cyclone, which was discharged from the overflow pipe and became an overflow, while the coarse particles continued to spiral downward along the wall to form an external cyclone, and finally discharged from the bottom outlet to become gravel. Working principle of TBS: Disturbance sedimentation is used for separation according to density, and no medium is needed. The water jets from hundreds of high-pressure nozzles at the bottom form turbulence, and the coal particles interfere with the settlement. The low-density object rises to overflow, while the high-density object falls to underflow, and the sorting density can reach 1.35- 1.8. Overflow products with Ep value of 0. 12-0. 16 can be mixed with clean coal, and underflow products can be mixed with middle coal or coal gangue. In the production process, the flow rate of turbulent nozzle is often adjusted by adjusting the flow rate of pump, so as to realize the adjustment of separation density. Flotation machine, also known as flotation thickener, is mainly composed of slurry carrying tank, stirring device, aerator, device for discharging mineralized bubbles, motor, etc. 1. Mud receiving tank: with mud inlet and gate device for adjusting mud level. It is mainly composed of a tank welded with steel plate and a gate welded with steel plate and round steel. 2. Stirring device: used to stir the pulp to prevent ore from settling in the tank. It is mainly composed of pulleys, impellers and vertical shafts. The impeller is made of wear rubber. 3. Aeration device: It consists of a duct and an air inlet pipe. When the impeller rotates, negative pressure is generated in the impeller cavity, and air is sucked through the hollow pump pipe and dispersed in the pulp to form a bubble group. This pulp containing a large number of bubbles is quickly thrown to the stator by the rotating force of the impeller, which further refines the bubbles in the pulp, eliminates the rotating motion of the pulp flow in the flotation tank, and produces a large number of vertically rising microbubbles, which provides the necessary conditions for the flotation process. 4. Device for removing mineralized bubbles: scraping bubbles floating on the tank surface, which mainly consists of a motor-driven reducer and a reducer-driven scraper. The working process and principle of the flotation machine: Coal slime and chemicals are fully mixed in the first chamber of the flotation machine and enter the bottom of the tank. After the impeller rotates, negative pressure is formed in the wheel cavity, so that the pulp at the bottom of the tank and in the tank respectively enters the mixing area from the lower suction port and the upper suction port of the impeller, and the air also enters the mixing area along the deflector, where the pulp, air and chemicals are mixed. Under the centrifugal force of the impeller, the mixed pulp enters the mineralized area, and the air forms bubbles and is crushed, and fully contacts with the coal particles to form mineralized bubbles. The mineralized bubbles are uniformly distributed in the cross section of the tank body under the action of the stator and the spoiler, and move upward into the separation area to enrich and form a foam layer, which is discharged by the foam scraping mechanism to form clean coal foam. Unmineralized coal particles at the bottom of the tank will be mixed, mineralized and separated again through the circulation hole and the upper suction port. Part of the pulp at the bottom of the tank that is not sucked by the impeller enters the bottom of the tank in the second room through the middle ore box buried in the pulp, and enters the third room after completing the whole process of the first room. The flotation machine keeps running, and the pulp enters the tailings box after passing through the last room to discharge the last tailings. Flotation machine (mine flotation machine) is driven by motor to rotate the impeller, which produces centrifugal effect to form negative pressure. On the one hand, enough air is inhaled to mix with the pulp, on the other hand, the pulp is stirred to mix with the medicine, and at the same time, the foam is refined, so that minerals attach to the foam and float to the surface of the pulp to form mineralized foam. Adjust the gate height, control the liquid level, and let the useful foam be scraped out by the scraper. Jiexiu Dongxin Coal Chemical Company has good equipment. You can go and have a look.