The type of the flotation machine and the specification selection have something to do with the nature of the raw ores, equipment performance, concentrator scale, the structure of the process and other factors. When choosing the flotation machine, the users should pay attention to the following problems:
1, the nature of the ore and the requirements of sorting operations: generally, as for the coarse-grained and large ores, it will use the flotation method with high concentrations to reduce the sedimentation rate of mineral particles and to reduce the deposition of the mineral particles. Therefore, it is better to use the high-energy mechanical flotation machine. This flotation machine transfers the slurry fast and the stirring ability is strong and it is also easy to start after the shutdown. In the flotation process of low grade sulphide, low-speed air inflation is more favorable for the sorting effect. The ores that are prone to generate sticky foam should choose the flotation machine with large air inflation in the flotation process. Selection operation is to improve the concentrate grade and the foam layer should be thin to create better conditions for the separation of the gangue. Therefore, the selection of flotation-cell.html">flotation separator in the selection operation should be different from that in the scavenging operation.
2, the slurry flow rate: a reasonable choice of the specifications of the flotation machine should be based on the slurry flow rate. To ensure the sorting effect, it should ensure that the slurry should has some residence time in each flotation tank. Too long or too short will cause the loss of useful minerals. Therefore, the specifications of the flotation machine should comply with the scale of the dressing plant.
3, to determine specifications and quantity of the flotation machine through the comparison of technical and economic indicators: in the comparison of the programs, the comprehensive comparison of sorting indicators, operating expenses, operating management, maintenance and overhaul should be conducted. The sorting indicators should be the dominant factor.
4, to pay attention to the availability and manufacturing quality of the equipment and the supply of the spare parts.
Original link: http://www.mine-crusher.com/news_147.htm
When it comes to the screening operation of the wet materials, the normal production of the vibrating screens is often affected because of the blockage of the mesh of the vibrating sieve. The wet and fine-grained materials are easy to bond into the block because of the stickiness, which is difficult to loosen; or the materials will adhere to the sieve of the vibrating screen to block the mesh, reducing the effective screening area of the sieve and leading to the decline in screening efficiency. If the material group is not loose, non-hierarchical and does the mass motion, it is difficult to complete the screening process. Therefore, the screening of the wet and sticky materials is a major issue that needs urgent address in the screening operations as well as in the various production lines (stone production line, sand production line).
Since the advent, the vibration screening equipment has continued to make progress and development and the scope of the screening material is constantly expanding. There was no solutions to the screening of the wet materials and the materials that are difficult to screen before, but after the continue efforts of our company's technology personnel, the dry screening equipment has been already developed for the screening of the wet and sticky materials and the materials that are difficult to screen. It is the large-scale screening equipment.
The large size of the vibrating screen refers to the large-scale of the motion parameters and large scale of the screening area. The large size of the motion parameters mainly solves the screening problems of the materials that are difficult to screen; the large-scale of the screening sieve area is mainly to solve the processing ability of the sieve. The large-scale of the vibrating screen requires higher requirements of the structural strength. The law of motion of materials: to obtain a good screening effect and a large processing capacity, sufficiently large amplitude and vibration intensity are necessary.
Original link: http://www.hxjqcrusher.com/155.htm
Flotation machine is suitable for the sorting of non-ferrous metal and ferrous metal as well as the sorting of non-metal such as: coal fluorite and talc. Driven by the motor and v-belt, the impeller of the mechanical flotation machine rotates, which will generate the centrifugal effect, forming the negative pressure. On the one hand, the adequate air will be sucked into to mix with the slurry, on the one hand, it will stir the slurry to mix with the reagents and refine the foam to make the minerals adhere to the bubble. The flotation rate of the flotation machine means the required flotation time when the flotation machine achieves a certain recovery rate (or the unit production capacity of the flotation machine). To increase the recovery rate and shorten the time of flotation is to improve the flotation rate. The following is the major measures to improve the flotation rate:
1, the reasonable adjustment of the prescriptions and the amount of the foaming agent should be paid particular attention to. In general, a slight increase of the foaming agent will promote the flotation speed. It must be noted that the excessive foaming agent will reduce the selectivity. Therefore, in the case of selection and that the dosage of the collectors is large; the operator should pay more attention to the amount of the foaming agent. It should be not excessive.
2, the pulp should go through the flotation-cell.html">flotation cell as soon as possible. The slot in series is faster than the tank in parallel and it is also conducive to enhance the flotation rate.
3, within the appropriate range, the operator should increase the impeller speed and reduce the trough depth so that the air gap between the impeller and a cover becomes narrow to promote the flotation rate.
4, to control the pulp density, which helps to get the maximum speed of the flotation.
5, the size of the groove must be appropriate. Generally, the slot size can not be too large. If it is too large, the slurry will stay too long in the groove, which will not only make the concentrate foam depleted, but also reduce the flotation rate.
Original link: http://www.hxjqcrusher.com/153.htm
To maintain the best condition of ball mill is an important means to realize the energy saving and consumption reduction in the pulverizing system. The coal storage in the drum is one of the key factors of influencing the operation of ball mill, but its detection and control has been the difficulty to control of the ball mill. With the rapid development of advanced control theory and detection technology, the control theory of the multi-variable control and adaptive control have been applied to the control of the pulverizing system of the ball mill, having achieved some theoretical and practical application results.
As the significant mineral resources are gradually depleted and the ball mill shows a large-scale trend, Henan Hongxing Heavy Industry pays more attention to the expansion of the production scale of ball mill, lowers production costs and improves the technical and economic indicators, and thus the development of the ball mill has attracted more attention. In recent years, due to the application of the enlarged simulation technology and innovative technology of ball mill as well as the usage of gearless ring motor, ball mill constantly develops to the large and innovative trend.
With the change of the times, the ball mill is widely used in metallurgy, mining, building materials and other fields. It is featured with simple structure, reliable operability and strong adaptability to materials. However, the effective utilization of the energy of the ball mill is low and it belongs to high energy-consuming equipment. In the metallurgical beneficiation industry, the power consumption of the crushing section accounts for 50% -65% of the total electricity and accounts for 60% -70% in the cement production enterprises. In order to reduce the power consumption in the ball mill grinding, the experts and technicians have made constant improvements in technology and innovation, hoping to make more new breakthroughs.
Rotary kiln : http://www.hxjqcrusher.com/Rotary-kiln.html
flotation separation process : http://www.ore-mills.com/flotation-concentrator.html
In the production, the excellent flotation machine should meet the following basic requirements:
(1) it should have large inflatable volume and it is easy to adjust. Bubbles are the means of delivery of hydrophobic particles, the number of bubbles directly affects the flotation rate, its importance is obvious. When processing the coal, the productivity of the clean coal is large, therefore, the main factor that determines the production capacity of the flotation machine is inflated amount. In addition, the different ores and different flotation operations (roughing, scavenging, selection) have their own appropriate inflated volume, which requires that the amount of air is easy to adjust.
(2) stir intensity should be sufficient to guarantee that the distribution of the pulp density and particle size in the slot is uniform and it is easy to restart directly after the stopping of the flotation machine with full load. The large slurry circulation in the tank can ensure the more contact opportunities between the mineral particles and air bubbles.
(3) the capacity should be large to adapt to the higher amount of processing.
(4) it should be able to discharge the foam concentrate timely and stably. The stability of the pulp liquid level in a flotation tank is the guarantee of the stability of the foam layer. If the liquid level appears fluctuations or the formation of waves and whirlpools would undermine the stable discharging of the foam concentrate.
(5) simple structure, easy maintenance, low power consumption and long service life of the wear parts.
(6) it should adapt to the need for automation. In the dressing plant that uses the automatical control systems, in addition to the above requirements, it should meet the additional requirements: it should be able to adjust the discharge rate od the concentrate flexibly to quickly; it reduce the number of instrumentation and implementing agencies; it can realize the long-term and safe operation.
The cement mill is also known as the cement ball mill, which is usually used to manufacture the cement. The cement ball mill in this industry is mainly the large machine. The small cement ball mill can be found in the laboratory of researching the quality of the sample material in the grinding. The cement ball mill is the ideal grinding equipment with low volume. It can be applied to the grinding of mixing or dispersing material such as paint pigments or the shape processing and surface treatment of air conditioning materials. It can handle the materials quickly, easy and economical.
1, to add the crusher that is used for the fine crushing in front of the cement ball mill. The fine crushing before the grinding can greatly reduce the granularity of the materials to be grinded, thereby reducing the load of the grinding system.
2, to improve the grinding system of the cement ball mill to improve grinding efficiency. The most direct benefit of the improvement grinding efficiency is that the finished fine powder can be selected timely to the maximize to reduce the re-grinding possibility of the cement products and reduce the load of cement mill. The transformation of the body of the cement mill, namely, the improvement of the grinding system, is the most fundamental solution.
3, to add the high efficiency separator. If the particle size of the materials to be grinded is reduced, the efficiency of the separator will be increased. If the efficiency of the grinding system is low, it will not only affect the cement mill's production, but also affect the quality of the cement. The cement ball mill is characterized by the small (relatively) diameter and the longer length.
raymond mill : http://www.crusher-export.com/raymond-grinder.html
Driven by the deceleration devices, the cylinder of the ball mill rotates. The crushed ore and steel ball in the cylinder body are lifted to a certain height by the liner under the role of the friction and centrifugal force when the cylinder rotates and then the ores fall off. The ores gradually are crushed under the role of impact and grinding. The ore that has been crushed is discharged through the discharge tube. The discharged will be sorted by the mineral classifier5.html">spiral classifier and after the classification of qualified products, the grit will be sent back to the ball mill for another grinding. The continuous and uniform feeding of the feeder guarantees that the materials are fed to the ball mill continuously and evenly.
The precautions that need attention in the routine operation of the ball mill:
Before the power is turned on, the operator should check the indenter whether it is pressed, before the, should detect whether the programming is correct and the protective cover is in good position.
The rotational speed of the ball mill should be less than 400 revolutions / minute and the continuous running time generally should not be more than 12 hours.
The operator should check the machine every 1-2 hours time when it is in operation to ensure the normal operation of the ball mill. When encountering the power failure, the operator should shut down the machine immediately. After the voltage is normal, the ball mill can be restarted. If there were any failures in the operation of the ball mill, the operator should immediately turn off the power, and immediately report to the person in charge.
During the dry grinding, the total amount of the powder and the steel balls should not exceed 2/3 of the volume of the milling pot; in the wet grinding, the volume of the powder and the alcohol should not exceed 1/2 of the total volume of the milling pot.
If the ball mill had abnormal sound, the operator should immediately turn off the power and find the cause in a timely manner.
After the operation of the ball mill, the operator should clean it up and shut off the main power switch.
Ore beneficiation : http://www.hxjqcrusher.com/crusher/Ore-beneficiation.html
With the constantly increasing demand for the rotary kiln, the traditional rotary kiln cannot meet the demand at this stage. If the enterprises want to make the rotary kiln realize the continuous development and growth, the only way is the constant technological upgrading and innovation. Hongxing Heavy Industry has already made considerable progress on the basis of understanding the needs of customers, summarizing the successful experience of the rotary kiln industry and combining with the actual situation of the rotary kiln production at home and abroad. After years of research of rotary kiln, a variety of new products have been developed such as the ceramic sand rotary kiln, bauxite rotary kiln, cement rotary kiln, metallurgy rotary kiln, hematite rotary kiln, limonite rotary kiln, rotary kiln of zinc oxide, magnesium metal rotary kiln. When they are put into production, the energy-efficient hematite rotary kiln equipment is popular with the majority of customers. Hematite rotary kiln reduces the weight of the kiln shell and further protect the kiln shell plate for better insulation. Now, it is coated the ZS-1 high-temperature thermal insulation coatings and the construction methods are as follows:
1, the tile temperature or oil pool temperature of the rotary kiln should not exceed 45 ° C, and the users should also pay attention to the high temperature radiant heat of the tile and the oil pool and other parts to prevent the excessive temperature or the oil pool. The coating of the high-temperature thermal insulation coatings can prevent the high-temperature thermal from influencing the tile and the oil pool.
2, as for the existing rotary kiln, to coat the ZS-1 high-temperature thermal insulation coatings on the metal casing of the kiln shell, only a few millimeters can be able to reduce the temperature of the metal casing of the kiln shell to prevent heat loss and save energy as well as to realize the better protection of the metal casing of the kiln shell from the air corrosion to be rusty. And the weight of the increased insulation material is light, but it has the high hardness, which can withstand the external shocks.
Among the machanical equipment, the grinding equipment (ball mill, rod mill) recurs to the role of impact and grinding of the media (steel balls, steel bars, gravel) and ores to make the particle size of the ore further smaller to grind them into powder. The aim is to realize the maximum dissociation of the useful minerals of the ores and the gangue minerals in order to provide granularity that is in line with the requirements of next beneficiation process.
The following is the development status and characteristics of the mineral processing equipment and grinding equipment:
In order to achieve the arget of better crushing and less grinding, the domestic enterprises in this field begin to introduce more and more advanced international crushing engineering equipment as well as the introduction of more and more large-scale equipment.
The advanced equipment of internationally famous brand constantly optimize the structure and the performance of the grinding equipment. The development direction is the adoption of new design ideas, the introduction of modern science and technology and the development of large-scale.
The crushing principle of the material layer has had a tremendous impact on the research and development of the crushing engineering equipment. As for the development of new equipment and the transformation of the old equipment, they will usually adopt this principle.
With the development of crushing theory and test technology, catastrophe theory, fractal theory, discrete teaching and other methods are introduced to the study of crushing theory. The theoretical study of the milling process and the research of the crushing and grinding work index are still in the constant development. The test techniques of crushing tend to use small laboratory. Tests and computer simulations have the trend to replace the semi-industrial tests.
rotary kiln : http://www.ore-mills.com/rotary-kiln.html
The driving power of the bucket elevator is small and it adopts inflowing feeding and the revulsive discharging and the large capacity hopper intensive layout. In the operation of the bucket elevator, there is almost no material back and excavating material, therefore, the invalid power is small.
The application range is wide. Such kind of bucket elevator has few requirements of the types and features of materials. It can not only lift the general powdery and granular materials, but also can lift the materials with larger abrasiveness. It has good sealing and less environmental pollution.
It has good operational reliability. The advanced design principles and processing methods ensure the reliability of operation of bucket elevator. The trouble free time is more than 20,000 hours. Lifting height is high and the running is smooth so that the machine can achieve high lifting height.
The service life of the bucket elevator is long. The inflowing feeding way makes it unnecessary to use the bucket to dig the material. The extrusion and collision phenomenon rarely occurs between the materials. This machine is designed to ensure the rare sprinking in the feeding and discharging process of materials, reducing mechanical wear.
The working principle of bucket elevator: the hopper scoops up the material from the storage at the lower part and the materials will be conveyed to the top by the belt conveyor, flip down after bypassing the top wheel so that the material is poured into the receiving slot. The bucket elevator with driving transmission generally use a rubber band, which is attached to the lower or above following bend pulley. The chain-driven bucket elevator is generally equipped with two parallel transmission chains and a pair of drive sprockets. Bucket elevators are generally equipped with a chassis to prevent dust flying of the bucket elevator.
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