Development of the roller center rotating device of the rake thickener

 The rake thickener is the main concentration equipment of the beneficiation plant and an important link in the beneficiation system; it is used for the purpose of clarifying the muddy water after washing, and is used as circulating water for washing, and at the same time, it can recover the ore settlement. Therefore, the rake thickener is the key equipment to maintain the normal production of the washing plant. When the rake thickener fails, a part of the washing mud water cannot be clarified. For example, if this part of the washing water is recycled, the washing water concentration will gradually increase, and the washing production will be interrupted within a few hours.

The mud settling equipment originally used in the washing plant is a rake thickener with a peripheral drive caster type. The central column transmission bearing of the thickener often has the ball being squeezed away, which increases the running resistance of the rake frame and causes the production of beneficiation. Interruption; when dealing with faults and replacing the bearings, you need to drain the water in the rake thickener pool, and then lift the upper cage.

The structure of the original rake thickener center column transmission device is that a special pressure bearing is arranged between the upper rotating frame and the lower fixed frame. This kind of bearing structure is circular, the rolling ball is installed on the cage and placed between the upper and lower bearing rings, and the lower bearing ring is installed on the fixed bracket. The upper rotating bracket is fixedly connected with the rake frame and can be placed on the center column, and the rake thickener rotates along the center column. Because of this structure, the pressure bearing is in a relatively humid environment during long-term operation, and it is inconvenient to inject oil. It is also subject to the weight of the rake frame, the steady flow cylinder and the settled mud for a long time, but it is corroded and worn out. It can reduce the strength of the cage and increase the gap with the ball after wear. Long-term operation will cause serious deformation of the bearing cage. After being squeezed by the balls and the upper and lower frames, the bearing cage will also be broken. After the bearing cage is deformed and fractured, the movement gap between the upper and lower frames of the ball is increased, and the remaining body of the bearing cage causes the balls to squeeze each other, which will eventually cause the balls to be squeezed. After the bearing is damaged, the center transmission can only rely on the interactive friction between the upper and lower shaft rings. The increased friction and the squeeze between the balls increase the resistance distance of the rake frame. In this case, the rake thickener The applicable mud sedimentation thickness is reduced. When the mud volume in the pool is increased, long-term operation will cause the rake to be crushed or the motor to burn, which will interrupt production.

From the perspective of central transmission, the pressure bearing structure between the upper and lower frames of the original design frequently fails during actual production. The main problem is that the pressure bearing structure is not suitable for the transmission under the special working conditions of the rake thickener. Therefore, the original pressure bearing structure is transformed into a roller transmission.

According to the analysis of the effect: after the transformation is completed, because an oil injection pipe is connected to each roller oil injection hole, the oil can be injected on the rake platform, which is convenient for maintenance, low wear during operation, and low failure rate, making the maintenance cycle longer; After the replacement of the roller drive, the friction of the center column transmission is greatly reduced, and the running resistance moment of the rake frame is reduced, so that the thickness of the sedimentation mud adapted to the rake thickener is increased compared with the original bearing structure; You can observe the running status of the wheel on the top, so as to find all kinds of faults. When replacing the rollers, there is no need to drain the water from the rake thickener, nor to lift the upper cage, and the replacement can be completed on the cage.

After the center column bearing structure of the rake thickener was transformed into a roller structure, after several years of operation, the effect was good, and there was no failure. It not only increased the capacity of the mud water treatment system, but also reduced the impact of production, but also contributed to other mineral processing. The transformation of the rake thickener in the factory provides an effective attempt.

Reformation of Feeding Device of Deep Cone Thickener

Modern tailings water systems generally use closed loops. Thickeners are the key equipment of the tailings water treatment system. The concentration effect of the thickeners will directly affect the operation of the entire concentrator. The structure of the original feeding device mainly includes The defoaming barrel, the feed pipe, the upper straight section of the stabilizing barrel, the upper cone section of the stabilizing barrel, the middle straight section of the stabilizing barrel, the sieve plate and the lower cone section of the hidden barrel are composed of; The overflow weir of the thickener.

The structure of the defoaming cylinder is too simple, the mixing effect of the slurry and flocculant in the defoaming cylinder is poor, and the settling effect of the flocculant is poor; the straight section between the defoaming cylinder and the stabilizing barrel will be connected by a feed pipe, and the slurry will enter the stabilizer. The feed kinetic energy of the straight section between the barrels is large, which affects the sedimentation effect of the thickener, and the concentration efficiency is low; the upper end of the straight section on the stabilizer barrel is higher than the thickener overflow weir, and the clarified water at the upper part of the thickener cannot enter the original feed Inside the device, the flocs have not undergone the process of dilution, and the sedimentation speed of the flocs has slowed down.

The static flow stabilizer is composed of an inlet pipe, a cylinder, a baffle plate, a uniform cloth and a plate outlet pipe. After the flocculant is mixed with the slurry, the direction of the fluid is changed through the baffle plate and the uniform plate to make the flocculant and the slurry full The mixing of the kinetic energy of the mineral pulp at the same time can improve the flocculation effect.

The static steady flow mixer is equipped with two discharge pipes, which can further reduce the kinetic energy of the slurry.

The spiral material stabilization device is composed of an overflow cylinder, a cylinder, a spiral blade, a cloth plate, an inner cone and a lower cone; the upper end of the overflow cylinder is lower than the overflow weir of the thickener, and there are countless numbers on the upper part of the overflow cylinder A "rectangular" slot; the clarified water on the upper part of the thickener will flow through the upper end of the overflow cylinder and the "rectangular" slot into the spiral stabilizer, which realizes the self-dilution of the slurry, and the flocs are diluted to speed up the continuation The settlement rate.

The spiral blades on the inner wall of the spiral material stabilization device are distributed with multiple slots; the slurry entering the cylinder along the spiral blades gradually rises by its own kinetic energy, and a part of the slurry continues to rise along the spiral blades; The slurry flowing to the next spiral blade at the slot and the next spiral blade collides and mineralizes; the remaining part of the slurry flows to the center of the middle cylinder, and further collides and mineralizes with the falling slurry, making the flocculant and the slurry Fully mix to improve the flocculation effect.

Because the concentration of the slurry inside the spiral stabilizer is higher than the slurry injected onto the cone, part of the slurry passes through the small holes on the cone and collides with the spirally rising slurry in countercurrent; while reducing the kinetic energy of the slurry, it further improves Concentrated effect.

After the improvement, it has been running very well so far; the use of static steady flow mixer has improved the flocculant settlement effect of the flocculant; the kinetic energy of the slurry input is reduced through two-person feed pipes, and the purpose of mutual dilution is achieved; through the spiral The spiral blade in the material stabilization device consumes the kinetic energy of the slurry; the upper end of the spiral material stabilization device is lower than the overflow weir of the thickener, which realizes the self-dilution of the slurry and accelerates the sedimentation speed of the slurry; the final concentration of the overflow water of the thickener is small to ensure In order to improve the quality of the circulating water in the system, Xining and its consumption will be saved, reducing operating costs. After the transformation, it can be widely used in large-scale concentrators, and can replace ordinary rake thickeners to process mine tailings slurry.

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.

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