Showing posts with label flotation machine. Show all posts
Showing posts with label flotation machine. Show all posts

Monday, December 7, 2020

Innovative microbubble flotation of flotation machine

 The dual-flow microbubble flotation method is a compressed air flotation method that realizes the pulping process and the separation process. The unique microbubble mineralizer and slurry release head design of the trough-type dual-flow flotation machine increases the precipitation of bubbles. The surface area increases the contact area between the concentrate and the microbubbles, and the mineralization efficiency is correspondingly improved. In the flotation process of the trough-type dual-flow microbubble flotation machine, the coal slurry will be pumped out of the mixing tank by a pump and then pumped into the slurry distribution header of the trough-type microbubble flotation machine, and then distributed evenly to multiple groups of minerals The mineralization unit of the carburetor passes through the mineralizer, the inverted U-shaped mineralization tube, and finally is sprayed out of the tube by the nozzle. The air will be pressed into the mineralization unit under a certain pressure, and a large number of tiny bubbles will be formed through the microporous tube in the mineralizer. The bubbles and coal slurry complete the mineralization process in the mineralization tube, and finally sprayed to In the sorting tank, at this time, the pressure drops sharply, and a large number of bubbles merged into the coal slurry are formed and precipitated quickly. The coal particles float up to the surface of the flotation tank, overflow naturally along the periphery and enter the clean coal collection tank. A small amount of fine bubbles and A large amount of intermediate density materials enter the medium coal tank, and the tailings will enter the tailings tank through the U-shaped tube, which plays a role in adjusting the liquid level.

It adopts a multi-tank structure similar to the traditional mechanical agitation flotation machine. The upper part of the tank body is a rectangular connected structure, and there is an overflow tank on the periphery to discharge the clean coal. A rectangular diversion tank is opened on the overflow to increase the overflow. The perimeter is convenient to allow the clean coal to flow out smoothly. There are multiple pyramids of the same size in the lower part of the tank, and the lower part of each pyramid has an underflow outlet and a circulation outlet.

In order to further reduce the total height of the flotation machine body, so as to facilitate the disassembly, inspection and maintenance of the flotation machine related accessories, the mineralized coal slurry will enter the inverted U-shaped mineralization tube at a high speed and be in a state of high turbulence in the tube. Continuously fold back and collide for secondary mineralization, and eventually it will be ejected from the lower end release head.

The complete flotation process of the trough-type dual-flow microbubble flotation machine is a set of two flotation processes with main washing. The underflow of the main washing tank body enters the rewashing buffer barrel, and is pumped into the rewashing tank body. The overflow of the main washing flotation body is used as the final clean coal. The main washing buffer barrel is arranged in the rewashing material buffer barrel, and the rewashing buffer barrel and the rewashing tank body are integratedly arranged, which saves space to the greatest extent.

On the basis of the integration of the previous flotation machine, the trough type dual-flow microbubble flotation machine further increases the processing capacity of the flotation machine, reduces the height of the flotation machine body, and optimizes the entire process. It is a dual-flow microbubble flotation machine. A breakthrough in the serialization of the separator product will further enhance the technical advantages and market competitiveness of the dual-fluid microbubble flotation machine.

https://www.hotelterracentro.cl/dec9/

Monday, November 30, 2020

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

 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 minerals are prone to sinking grooves and poor selection indicators during the flotation process. On the basis of conventional flotation machines, the following principles will be followed for design (1 ) U-shaped groove bottom is used to reduce dead angles and avoid mineral sinks; (2) Large impellers and low speed drive are used to reduce the turbulence intensity of the slurry, which is conducive to the floating of coarse particles; (3) Equipped with larger At best, relatively many bubbles are formed, which can help attach and carry large particles to float; (4) Reduce the overflow strength of the bottom of the tank, shorten the rising distance of mineralized bubbles, reduce the interference of external forces and the roughness of the bubbles (5) Stabilize the separation zone and the surface of the slurry to ensure that the foam adsorbing minerals flows smoothly into the foam tank.

The structure design of the coarse particle flotation machine:

(1) Impeller and stator.

According to the fluid dynamics design theory, the impeller design of the flotation machine adopts a shape that is relatively similar to the impeller of a high specific speed pump. The tangentially rotating ore flow it produces is conducive to the suspension of minerals, the dispersion of air, and the selection index. improve. The stator must be able to convert the tangentially rotating slurry flow generated by the impeller into a radial slurry flow, and lift the coarse materials and dense minerals to the upper part of the tank, so that the mineral particles can be effectively suspended in the flotation tank. The contact probability of large mineral particles with bubbles increases the possibility of separation of coarse minerals and heavy particles.

(2) Impeller height

The height of the impeller from the bottom of the tank is related to the structural parameters of the flotation machine, the concentration of the slurry, and the composition of the particles. The greater the height, the easier it is to start the flotation machine, but it is easy to cause the sinking tank of the ore particles in the tank and the fluctuation of the slurry surface. Lower the height, the mineral particles are not easy to sink, but the suspended state is easily destroyed, the phenomenon of stratification occurs, and the flotation conditions are deteriorated. The appropriate height of the impeller from the bottom of the groove can be determined through experiments.

(3) Regulating device at best

The aeration volume of the flotation machine varies with the different minerals, and the selection index of some minerals is very sensitive at best. Therefore, we have designed a stepless speed regulation device at best to realize the fine adjustment of the aeration volume, so that the right amount of low-pressure air is evenly dispersed in the entire flotation tank to ensure that the non-floating mineral particles and mineralized bubbles in the upper separation zone of the tank body Separate.

According to the hydrogeological conditions of the wellbore project, the freezing method can be adopted for construction, short-section digging and building, rolling shift operation system, implementation of mechanized comprehensive supporting operation lines, multi-process parallel and intersecting operations, reducing auxiliary operation time, improving work efficiency, and fully Mobilizing the enthusiasm of employees has enabled the wellbore to break through the 100-meter mark for several consecutive months, achieving the goal of high-quality and efficient work.

Tuesday, October 27, 2020

What factors can cause the flotation machine to not work normally?

 The flotation machine is a full-grain flotation machine, suitable for both coarse and fine particle separation. After the Chinese pulp of the GLF flotation machine is processed, the flotation machine must be agitated and aerated, so that the mineral particles can be fixed on the bubble and float to the surface to form a foam product, and the rest will be stored in the pulp for separation . The GLF flotation machine is not only a stirring device, but also capable of forcibly blowing in air under the external special action. The mechanical stirring device is used to agitate the slurry to distribute the air flow, and the aeration and stirring of the slurry work separately. The GLF type aerated stirring flotation machine can be adjusted according to its own needs at best. Only in this way can it be helpful to improve the sorting capacity and processing capacity of the flotation machine. However, due to the larger processing capacity and the shallower flotation cell, the required power consumption is lower. GLF flotation opportunities because the impeller speed is low, the concentration of the slurry when passing through the impeller will also be lower, and the ore particles will become finer, which will correspondingly reduce the efficiency of flotation. In this case, the impeller and stator will reduce wear. There is a grid plate in the flotation tank, which will cause a suspended layer of coarse particles, which can make the surface of the slurry more stable and make the technical performance better. In this case, it is beneficial to the coarse particle flotation.

flotation machine


There are several common faults of GLF:

(1) The cover plate or stator screw of the flotation machine is off.

During the entire operation of the flotation machine, the cover plate and screws will easily fall off due to the rotating impact and vibration of the flotation machine itself. This situation will affect the normal operation of the flotation machine. Therefore, the flotation machine is carefully checked before each work.

(2) The bottom of the flotation machine is worn.

If the flotation machine runs for a long time and rotates strongly, the bottom of the tank will be worn and thinned, and the surrounding guard plate will be worn and deformed, and under the action of the flotation agent, the bottom of the tank will also be worn and deformed. Therefore, when wear occurs, It is necessary to repair welding in time.

(3) Pry up the bottom guard plate of the groove.

During the flotation process, the tank bottom guard plate protects the bottom of the tank. When the impeller rotates strongly, the circulation of the ore in the flotation tank will be accelerated. In severe cases, the charge will increase and the guard plate will be pryed. It will cause an accident.

(4) Wear and corrosion of impeller and cover plate.

The impeller and cover plate are the core components of the flotation machine, and it is also a position that is easy to wear. It is directly related to the degree of aeration of the slurry during the flotation process. The degree of agitation in the sea area, but because the flotation machine is in the process of long-term work, it will The impeller also damages the cover plate, so the impeller and cover plate need to be repaired and replaced for a long time.

(5) The spindle is worn out.

When the spindle is in use, the rubber sheath of the spindle should be protected. After the rubber sheath is worn, the spindle wears quickly under the action of the internal circulation of the slurry, and it is very easy to break the shaft. Therefore, it should be updated frequently during the inspection. Rubber sheath.

(6) The bearing clearance becomes larger.

When the main shaft of the flotation machine is running at high speed, the bearing gap will easily become larger, which will damage the bearing. At this time, only the tightness of the inner and outer gaskets of the bearing needs to be adjusted.

(7) The motor generates heat.

During the operation of the flotation machine, too much sand accumulates in the flotation cell, the cover plate and the ore tube fall off, and the circulation of the ore tube is too large, which will cause the electric heater to heat up. In this case, the cover plate and the ore tube should be provided. Tighten it in time when it is loose, and replace it in time when the circulation volume of the ore pipe is too large.

    As mentioned above, during the use of the GLF flotation machine, due to the harsh environment and poor maintenance during use, various problems will occur. Therefore, timely attention and regular maintenance should be carried out to prevent the work process from being blocked. Off.