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.

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.

How to use large flotation machine to separate copper and molybdenum ore

 About 90% of non-ferrous metal recovery in the world will use flotation method, in order to realize mineral flotation flotation machine plays a great role. Large-scale flotation machine can significantly improve the processing capacity of beneficiation, reduce consumption, and obtain higher benefits.

The flotation machine is a motor that drives the rotating shaft to rotate the impeller. Under negative pressure, the pulp moves between the impeller and the stator, and the centrifugal blower is evenly dispersed in the air through a porous cylindrical air distributor for mineralization. After the stator is stabilized, it rises to form a stable foam layer, and enters the next operation through the upper foam tank. The remaining slurry will flow through the flow holes in the tank wall to the next tank for sorting, and finally become tailings.

The main characteristics of tooth decay of the super large flotation machine are:

(1) The pulp aeration and bubble mineralization effect is good.

The air coming in from the blower will directly enter the air inlet on the top of the flotation machine through the air duct. A regulating valve that controls the air volume is installed at the air inlet. The air can directly enter the hollow shaft to ensure that the slurry in the flotation machine is not fully affected by the equipment. Mineralization. And a good amount of aeration can effectively suspend the mineral particles in the entire flotation tank and evenly distribute the bubbles.

(2) Energy saving and loss of equipment.

Before the flotation machine, air was directly fed between the impeller and the stator by the blower. After the hollow shaft rotates, the equipment can make the air into the suspension state formed after stirring at low speed and enter the selection for selection. The stator adopts The form of low damping changes the direction of the slurry flow to the radial direction, which can reduce the resistance circulation and power consumption of the slurry.

(3) High efficiency of automatic liquid level control. The slurry level in the flotation machine can be detected by a slurry level gauge, which can realize automatic control of the slurry level. The tailings box and the middle box have a cone valve to control the flow of the slurry, which is controlled by a pneumatic actuator, so that it can be used for full adjustment of the slurry.

(4) Conducive to improving the selection effect. The deep cone structure can mineralize the pulp to provide a stable foam zone and a longer separation zone, so that low-pressure air can be fully dispersed in the solid, liquid, and gas three-phase strong turbulent mixing zone at the bottom of the flotation machine, which can generate bubbles If it is fully utilized, there is a large speed difference between the bubbles and the pulp. There are more opportunities for fine particles to contact the bubbles, and the fine particles will fully float out. The slurry will sink, increase the chance of collision of bubbles and increase the chance of flotation.

(5) Convenient operation and management of equipment.

Can drive the load to start; advanced slurry level control olefin; reduce short circuit circulation; spare parts wear light, low maintenance and repair costs; simple structure, easy maintenance; low energy consumption; good air dispersion; low chemical consumption, saving investment and so on.

Research on unit consumption and service life of ball mill liner

 The liner is a key easily damaged part for the ball mill. The unit consumption and service life of the liner are inseparable from the working efficiency of the ball mill.

     The factors that affect the wear rate of the liner mainly include the corresponding particle size and hardness of the material to be ground, how much electricity is needed to grind each ton of material, the diameter of the mill and its speed, the structure of the liner and the wear resistance of the liner material The percentage of the weight and volume of the original lining board and the original lining board. For the current process, the metal liner is mostly low-grade ore first-stage grinding, but for most low-grade ore, the content of silica and other hard grinding and corrosive minerals are very high, but in this case In the second-stage grinding process, many concentrators will choose ball mills to use rubber liners.

     The service life of the cylinder liner is four factors: macroscopically speaking, the resistance to impact failure damage; macroscopically speaking, the resistance to fatigue failure damage; the resistance to surface cutting or cutting wear; the surface microscopic resistance to impact fatigue and wear Kind of operating conditions.

How to throttle resources for ball mill

 Nowadays, with the continuous development of social productivity, green energy saving has become the theme of today's society, and various equipment has been continuously improved to save energy and reduce expenditure, especially in the heavy industry industry. It's easy to say, but for mining, power consumption is a big problem. Therefore, in response to similar problems, we propose two improvements, one is the equipment itself, and the other is to improve the operation of the process.

On the one hand, resource throttling of the ball mill is very important. First of all, when designing the ball mill, full consideration must be given to the accessories and devices to save power and reduce consumption. In the design of the ball mill, considering the purpose of energy saving and consumption reduction, a new type of transmission system is specially designed, and a planetary gear reducer is used for transmission, which changes the traditional transmission layout and greatly improves the working efficiency of the motor. This is one of them. Design advantages. In addition, when designing the ball mill, the bearing, drive mode, and liner of the ball mill also added innovations and played a great role.

Another aspect is the process operation. The process is continuously optimized. The three main aspects are the selection of the process flow, the topping method of the steel ball, and the stable and safe operation. Continuously optimize.

The above is what we need to improve. Starting from these aspects to improve equipment to save resources is also a direction we need to continue to develop.

The "hidden rules" of ball milling

 Corresponding proportioning of the ball mill, so that it can crush minerals to the greatest extent, and meet the requirements of mineral crushing and grinding. The quality of mineral crushing can directly affect the efficiency of milling, and ultimately affect the overflow output of the ball mill. The level of ball loading can directly affect the crushing effect. These parameters are mainly affected by the specifications of the ball mill, the internal structure of the ball mill, and the fineness of the product.

The ball must have sufficient impact force so that the ball has sufficient crushing capacity to handle the material, which is directly related to the diameter of the steel ball.

The number of impacts of loading the ball must be enough so that the ball can crush the material. The average ball diameter and filling rate are the main influencing factors. The amount of filling is fixed. In order to ensure sufficient impact force, the diameter of the sphere can be reduced and the number of spheres can be increased to increase the number of impacts on the mineral and improve the crushing efficiency.

To ensure sufficient time for the material to grind in the mill, the ball must have the ability to control the flow rate to ensure that the material is fully crushed.

The law of two-level ball allocation

The use of two spheres of different specifications for grading is called two-stage grading, but there is a requirement that the diameters of the two spheres differ greatly. Its main function is to improve the impact capacity and the number of impacts of the mill. In addition, the higher bulk density allows the material to be fully ground.

In the two-stage ball distribution rule, the large balls are mainly used to crush materials, and the small balls are mainly used to fill the gaps of the large balls to increase the bulk density of the balls, thereby controlling the flow rate of the flow, thereby increasing the grinding The second is the transfer of energy; the last is to squeeze the coarse-grained materials in the gap into the impact area of ​​the big ball.

See details：https://www.pizzerie-u-pepy.cz

What to do if the flotation effect is not good?

 In the flotation process, there are many processes that affect the flotation effect. There are not only non-adjustable factors of ore properties, but also adjustable factors such as pulp concentration, pulp temperature, pH, flotation time, grinding fineness, and reagents. Let's introduce them one by one below.

Ore properties refer to the chemical composition, mineral composition, structure, structure and element occurrence state of the ore. The oxidation degree of the ore has a great influence on the flotation effect, because oxidation will change the original mineral structure and make the mineral composition It is more complicated, thus changing the physical and chemical properties, and at the same time, oxidation will change the pH of the pulp, which will affect the use of chemicals.

There is a great relationship between pulp concentration and recovery rate. Generally speaking, there is a normal distribution between the slurry concentration and the recovery rate. Only when the optimal concentration is reached, the recovery rate also reaches its peak. In the flotation process, the slurry must maintain a certain concentration of reagent to obtain good results. When the slurry is thicker, the reagent concentration should be increased accordingly. When the slurry concentration increases, the flotation time and processing capacity of the flotation machine should also increase accordingly.

The temperature of the slurry is also an important factor affecting the flotation effect. Heating can accelerate the movement of molecules, accelerate the dispersion and hydrolysis of the reagent, and increase the interaction speed between the reagent and the mineral surface.

The pH of the pulp often affects the floatability of the mineral, but the critical pH will change with the change of flotation conditions. Under certain conditions, any mineral has a suitable pH value, and only under this value can a better flotation index be obtained.

Flotation time refers to the residence time of the slurry in the flotation tank. To determine the best flotation time, it should be determined in advance through the beneficiation test. When the floatability is good, the content of the minerals to be floated is low, the slurry concentration is small, the agent has a strong effect, and the flotation time is short. On the contrary, longer floating time is required.

The appropriate grinding fineness should be determined according to the particle size of the useful minerals, to dissociate the useful minerals from the gangue, and minimize the symbiosis between the minerals and the gangue. For single minerals, the fineness of grinding must be less than the upper limit of the floating particle size of the mineral.

However, it should be noted that the finely ground particle size of the ore will also have an adverse effect on the flotation effect, so the selection of the appropriate grinding particle size is of decisive significance for the final effect.

In the flotation process, the agent addition system is called the formula, which mainly refers to the type, quantity, order, addition point and preparation method of the agent. The type of medicament is mainly determined by the results of ore selectivity research, and the dosage of medicament is determined by the beneficiation test and practical experience. In the actual operation process, timely adjustments should be made according to changes in the situation. It is determined according to the dissolution rate and action time of the drug.

Every detail in the flotation process will affect the final flotation effect. It is recommended to conduct a beneficiation test before flotation, and determine the process parameters according to the beneficiation test results to achieve the best results.

How to determine the reasonable load of the grinding body of the ball mill

 The configuration of the grinding body of the ball mill will have a great influence on the output quality of the ball mill. If there is a gradation of the grinding body, then the conditions such as the load of the grinding body must be fully considered. The following briefly introduces the calculation method of the grinding body.

The first condition is the filling rate of the abrasive body. So what is the filling rate of the abrasive body? The percentage of the filling volume of the grinding body compared to the effective volume is called the filling rate of the grinding body. Generally speaking, if the filling rate of the grinding body is too high or too low, the grinding efficiency of the mill will be too low. For the grinding body filling rate greater than 32%, you can use the formula to calculate:

Φ0=113-126H/Di

Since there are many influencing factors of the grinding body, it is necessary to find a better filling rate in the production and adjust the equilibrium state according to the degree of change of the influencing factors.

Then we have to mention the loading capacity of the grinding body. What is the loading capacity of the grinding body? It is the quality of the grinding body loaded into the mill (or in the container), and the size of the load mainly depends on the filling rate of the mill. The calculation formula of the loading capacity of the grinding body:

G=VΦ0

                                                G=0.00785Di2LΦ0

It can be seen from the above that G——loading capacity (t), V——effective volume (m3), Di——effective diameter (m), L——effective length (m), Φ——filling rate (%), P ——Bulk density (t/m3)