How to perform high-intensity work on filter thickener

By -

 The process adopted by the coal industry in my country is mainly based on wet coal preparation, and a large amount of slime water will be produced in the process of coal processing. Therefore, the treatment of slime water is a key link in the production of a coal preparation plant. The operation of the slime water system is related to whether the coal preparation plant can be normally produced. At the same time, it also involves the water of the coal preparation plant and the recovery of coal resources. Protect many aspects of the ecological environment. The thickening and clarification of slime water is an important link in the treatment of slime water. Under the current situation, we can use the rake thickener based on the principle of gravity sedimentation as the main equipment to apply, and then use the principle of gravity sedimentation to concentrate the slime water The equipment efficiency drops greatly, which will cause the overflow water concentration to exceed the standard, which will have a serious impact on the washing equipment. Therefore, further development of the new type of concentration equipment is very necessary.

The filter thickener is a new type of thickening equipment. Its working principle is different from the current thickening equipment in coal preparation plants. When the equipment is running, the filter slurry will be continuously pumped through the feed pipe by the internal filter and The filter room enclosed by an external static body. And to maintain a full state, use the pressure difference between both sides of the rotor to achieve filtration and concentration. The flow state of the slurry in the filter chamber is related to the speed of the rotor. When the speed of the rotor reaches a certain limit value, A kind of annular vortex called Taylor vortex will be generated. Adjacent Taylor vortices will be connected at a certain axial flow rate to prevent the axial reverse flow or short circuit of the liquid flow. Therefore, the liquid flow between the outer cylinders It is an ideal columnar flow. The slurry in the filter chamber undergoes a top-down rotational movement under the combined action of the resistance of the outer wall, gravity and centrifugal force. When flowing through the area, the pressure difference between the two sides of the filter medium will be used for the outer wall of the rotor. A filter cake is formed. When the filter rotor rotates, the filter cake on the medium will be subjected to the action of shearing and sweeping, thereby achieving filtration and concentration under the thin cake layer. Finally, the filtrate will pass through the filter medium and be discharged from the discharge port inside the drum to complete the filtering and concentration effect.

However, through the simulation of the filter thickener, it is found that the change of the internal flow field is related to the concentration of the feed, the speed of the drum, the pressure of the feed, and the opening of the concentrate outlet valve. Therefore, according to the simulation results, It is used to analyze the influence of the four factors of the concentration of the feed, the rotating speed of the drum, the pressure of the feed, and the opening of the concentration outlet valve on the concentration effect. The range analysis of the experimental results shows that: (1) The higher the feed pressure, the lower the concentration of the concentrate. This is because as the feed pressure increases, the driving force of the filtration process increases, and Wyeth is many small The particles penetrate the essence into the clarified liquid; (2) The smaller the opening of the concentrated liquid outlet valve, the greater the concentration of the concentrate. This is because the reduction of the valve opening makes the filtration time longer and the filtration pressure increases. Increase the filtration capacity of the clean water; (3) The feed concentration increases, and the concentrate concentration increases. This is because the thickness of the filter cake and the filtration resistance increase with the increase in the feed concentration, so that the ability to trap fine particles changes Strong; (4) If the rotating drum speed is too fast, the concentration of the clarified liquid will increase. This is because the rotating drum speed is too fast and the centrifugal force field will increase the filtration resistance.

https://www.fat-tonys-pizza.de/

Comments

Post a Comment

Popular posts from this blog

Selection of spodumene flotation reagents

By -
Image
At present, the  beneficiation methods of spodumene  mainly include: manual separation, thermal disintegration, magnetic separation, resuspension method,  flotation method  and combined beneficiation method. Among them, the flotation method of spodumene is the most studied in the laboratory and the most widely used mineral processing method in industry. 1. Cationic collectors The cationic collectors used in the flotation of spodumene ore are mainly amine collectors, which flotate gangue minerals such as quartz, feldspar and mica under acidic conditions, and leave the spodumene at the bottom of the tank. This method is often used in the roughing of spodumene, and cannot directly obtain spodumene concentrate with higher purity, and needs to be used in conjunction with other sorting methods. In production practice, Yan Gengsheng used  the process of flotation of spodumene  with mixed soap and diesel oil under alkaline conditions after flotation of mica with phylloylamine under acidic cond
Read more

How to use inclined plate thickener for tailings dry discharge

By -
Image
 Tailings treatment is an important part of mine production. Concentration in dry tailings discharge is an important link in achieving dry stacking. It not only directly affects the processing capacity of filter equipment, but also affects the resistance of filter cakes. The particle is resistive to the filter cake, so according to the characteristics of iron tailings, there is a new type of thickener . The flow of tailings slurry in the thickener is ideally slow. As soon as the solid particles leave the flow layer, they will be considered as sediment. This model is also called shallow sedimentation. The sedimentation occurs in the void between the inclined plates. Within the cavity, but due to the small spacing between the inclined plates, it creates favorable conditions for the formation of laminar flow. The clarified overflow water moves upward along the inclined plate space, and the solid particles settle between the two plates, and only need to settle to a small distance to fall o
Read more

A new type of coarse particle flotation machine for rough grinding and flotation in mines

By -
 Coarse ore flotation has always been one of the key technologies for mine coarse grinding and flotation to reduce energy consumption. An iron ore plant in Anhui Province has a very small content of mica in the iron ore of the first grinding product. Recovery value. However, there are generally two ways to recover mica at present: one is coarse-grained regrind and reselection; the other is to choose equipment suitable for coarse-grained mineral flotation. However, during the inspection of the production site, it was found that many of the mica minerals in the second-stage grinding products in this iron ore did not meet the particle size requirements of flotation, and the density of mica was small, and most of them showed flaky structure. The overflow of the cyclone ran out, causing the inspection and screening operation to be blocked first, so regrinding is not suitable for the recovery of coarse mica.     The design principle of coarse-grained flotation machine is that coarse-grained
Read more