China manufacturing industries are full of strong and consistent exporters. We are here to bring together China factories that supply manufacturing systems and machinery that are used by processing industries including but not limited to: gold concentrator, centrifugal concentrator, gold centrifugal concentrator. Here we are going to show you some of the process equipments for sale that featured by our reliable suppliers and manufacturers, such as Knelson Concentrator. We will do everything we can just to keep every buyer updated with this highly competitive industry & factory and its latest trends. Whether you are for group or individual sourcing, we will provide you with the latest technology and the comprehensive data of Chinese suppliers like Knelson Concentrator factory list to enhance your sourcing performance in the business line of manufacturing & processing machinery.
knelson-concentrator is one of high frequency used alluival gold separating machine . Compared with shaking table , it have higher processing capacity ,lower water consumption . Centrifugal concentrator is a batch machine that mean it can not unstopped working for long time . The gold ore after concentrated by gold centrifugal is recommended to separate by shaking table again to improve the grade .
Product Introduction knelson-concentrator is a gravity separation equipment that separates minerals with a large contrast in the centrifugal force field. It is one of the highly efficient gravity separation equipment and a new type of gravity concentration equipment for concentrating gold and other high density minerals. Its mainly used in the selection of placer gold, the preliminary enrichment of precious metal concentrates such as rock gold after grinding. So usually it is also called gold centrifugal concentrator or placer gold separator. Compared with other concentration machines, gold centrifugal concentrator has many competitive advantages that create high returns for the investors. So its popular in gold mining.
The knelson-concentrator is composed of feeding pipe, frame, tailing tank, drive motor, vertical shaft and beneficiation parts. The beneficiation parts are divided into inner and outer layers. The inner layer is a head-mounted cone. The inner cone is generally made of stainless steel with annular grid bars. There are many small holes on the cone wall. The outer layer is made of ordinary steel plate. The inner and outer layers form a closed water jacket. The middle drive shaft is a hollow shaft. The pressure water is fed into the water jacket formed by the inner and outer cones through the hollow shaft. The inner small holes continuously spray water into the grid bars to form backwash water. During the sorting process, the backwash water pressure level is 0.03-0.06MPa.is composed of feeding pipe, frame, tailing tank, drive motor, vertical shaft and beneficiation parts. The beneficiation parts are divided into inner and outer layers. The inner layer is a head-mounted cone. The inner cone is generally made of stainless steel with annular grid bars. There are many small holes on the cone wall. The outer layer is made of ordinary steel plate. The inner and outer layers form a closed water jacket. The middle drive shaft is a hollow shaft. The pressure water is fed into the water jacket formed by the inner and outer cones through the hollow shaft. The inner small holes continuously spray water into the grid bars to form backwash water. During the sorting process, the backwash water pressure level is 0.03-0.06MPa.
1. Common Used Models Non-automatic Mine Discharge: the gold centrifugal concentrator will be manually stopped after 4-6 hours of operation to clean the concentrate manually, then restart it to work. 2. Timing Automatic Discharge: We can custom according to customer needs. The cost is much higher, but the work efficiency is higher. It needs power distribution control cabinet.
With an electric control cabinet to control the switch of the pipeline gate valve, set the discharge time first (for example, 4 hours or 6 hours, it depends on the taste of the concentrate), install the electromagnetic gate valve on the sand pump pipe and the water pipe to switch automatically. The sand pump pipe with double. The main pipeline gate valve is automatically closed when it comes to the set time. And the side pipeline gate valve is automatically opened at the same time. The slurry is discharged from the side pipeline, and the recoil gate valve is automatically closed to stop feeding backwash water. The water pipe gate valve above the feed port automatically start to inject high pressure water to flush the concentrate inside the rotor. After a few minutes the concentrate is drained, it will automatically restart the equipment to work.
The rotor of the centrifugal concentrator rotates at a high speed at a certain number of revolutions. The slurry is sent to the inner wall of the drum by the ore separator through the ore nozzle in two places. The slurry rotates with the drum at high speed. Under the action of centrifugal force, heavy minerals are deposited on the inner wall of the drum and rotate with the drum. At the same time, it is necessary to continuously feed backwash water from the outside to the middle layer of the centrifugal rotor. A certain differential speed rotates with the drum. In the process of rotation, it rotates and flows along the slope of the drum from the feeding end with a certain helix angle, then to the discharge end, and later discharges through the discharge separator, which is the tailings. After working for about 4-6 hours, the inner wall of the rotor is enriched with a certain amount of concentrate, stop feeding the ore into the rotor. Wait the tailings are discharged, the ore discharging separator will automatically turn away from the original normal position and prepare to intercept the concentrate. Then the high-pressure flushing water valve is opened, and the high-pressure flushing water washes down the concentrate deposited on the inner wall of the rotor. After the concentrate is drained, the equipment is restarted and the cycle is repeated.
1.High Efficiency: Strong centrifugal force produced by high speed spin strengthens the process of gravity separation and effectively recover the fine ore particles. 2.High Recovery Rate: Application shows that the recovery can be higher than 98%. The concentrating ratio is up to 1,000 times. For different mines and particle size, the recovery rate is slightly different. Such as the gold recovery is 97% for 0.04mm in particle size, the gold is up to 98% in recovering the natural gold in lode ore with size -0. 074mm. 3.Small Footprint: only a small leveled place required. 4.Easy to Install: Only need connect the fluidization water and power. 5.Easy to Adjust: You can get the best recovery effect by giving proper water pressure and feeding size because just water pressure and feeding size will affect the recovery result. 6.Easy to Operate: Take the concentrate at the specified time. 7.100% Environment-friendly: chemical and mercury free, and use only recycled water. Reliable: Our Gold Centrifugal Concentrator gets a simple and tough structure. The main body is made by strong steel and the concentrate cone is made by stainless steel. It can run well by greased the bearing.
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Knelson concentrator cooperates with a gold shaker is a kind of advanced gravity beneficiation model with high efficiency and good environmental protection performance. The theory and examples of using a Nelson concentrator to recover gold and other precious metal with a gravity separation process are discussed in order to reduce the use of sodium cyanide and other chemical agents in gold mines.
The key problem to be solved by sorting fine particles is how to increase the sedimentation speed difference. For fine particles, due to the decrease of sedimentation velocity, the velocity difference in light and heavy ore particle is reduced. The classification of fine-grain carried out in the gravitational field is either very low efficiency or fail. On the contrary, the classification effect is enhanced in the centrifuge field.
The separation part of the Nelson gold concentrator is a double-wall cone with flushing holes on the inner wall, and a sealed water chamber is formed between the outer cone and the inner cone. On the inner wall of the inner cone( also called as concentration cone) has several circles of groove, and water inlet holes.
Knelson concentrator is a gravity concentrator based on centrifugation. In the high-intensity gravity field, the gravity difference between the mineral of high density and of low density will be amplified greatly, this gravity difference makes separating task in the high-intensity gravity field is easier than that of the normal gravity field. Under the interaction of fluidized water and hindered settlement, the mineral layer can keep losing condition continuously. Then the heavy mineral particles are settled, and the light minerals are discharged as tailings. When the machine at work, the ore pulp feeds into the bottom of the enrichment cone, the pulp is thrown to the inner wall because of the centrifugal force and moves up along the inner wall. At the same time, the water enters the chamber by through the inlet holes continuously, and make the mineral layer keep the state of flow. Under the interaction of centrifugal force and bounce-back force of water, the heavy mineral can bear the radial resistance, centrifugal settle in the concentrated layer. However, the gangue mineral cannot bear the bounce back force of water, discharge at the final.
A mining area in Africa has a rich gold reserve, the primary ore is sulfide gold ore, the oxidized ore is quartz vein type. Main metal minerals are iron pyrite, limonite, native gold, and few amounts of galena and sphalerite. The gangue minerals are mainly quartz, sericite, and pelite. The useful components are single and mainly natural gold, the content of harmful component is low, and the gold grade of original ore is AU 5. 3G / T. Crushing: three stages and one closed circuit Grinding: one closed circuit( -200 mesh takes 60%) Classification: FX-350 hydroclone(2 sets) Gravity separation: KC-CD20MS Knelson gold concentrator(2 sets) + 6S shaker(1 set) Tailings management: flotation Recovery rate: 94%
Knelson concentrator is an efficient centrifugal gravity separation equipment, suits for recovering precious metals such as gold, silver, platinum group and other heavy metal minerals, and has become one of the most used gravity separation machines. Advantages of Nelson concentrator:
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The Knelson Concentratorrelies on an enhanced gravitational force together with fluidization process to recover even very micron sized particles. First water is injected into the rotating concentrating cone through series of fluidization holes. Then feed slurry is introduced through a stationary feed tube. Once the slurry is filled in each cone, create a concentrating bed and high specific gravity particles are retained in the cone and then flushed into the concentrate launders. This procedure can be completed in less than one minute.
The Knelson concentrator (KC) is a vertical axis bowl-type centrifugal concentrator that uses a fluidized bed to perform its concentrating duty. It was first introduced as a semi-batch unit and has gone through several iterations of design leading to the development of a continuous discharge machine. It has now become almost an essential unit operation in any gold processing plant to assess the gravity recoverable gold content in the ore as well as to recover fine free gold from the grinding circuit.
Knelson Concentrator(KC) first introduced to the hard rock milling industry there-by providing gold recovery by handling a maximum feed size of 6 mm. More recently KC-XD30 is rated to process 60 t/h of feed solids.
The use of centrifugal force in a centrifugal concentrator enhances the relative settling velocity differential between the particles differing in size and density. Separation of particles even in finer size ranges is, therefore, possible in a centrifugal concentrator like a Knelson concentrator. Naturally, many attempts are being made to evaluate its performance treating various other minerals than gold. However, literature dealing with this machine is either case specific or towards the development of empirical models. Due to this reason the role of centrifugal force on the separation of fine minerals and the role of fluidization water are not clearly understood.
In any placer mineral, the density differential between the heavy minerals is marginal and hence, their separation using a gravity concentration technique requires thorough understanding of the physics of separation of particles inside it. However, the density differential between the heavy minerals and the quartz density minerals in a placer deposit is quite significant. Therefore, an attempt has been made to evaluate the performance of a laboratory scale Knelson concentrator while removing these two particle classes with an objective to understand the effects of G- force and the fluidization water pressure on the separation efficiency.
Essentially all the models consist of a conical inner shell, with a series of parallel vee shaped riffles, bolted to a rotating outer shell.Feed is introduced in the form of slurry at the bottom of the unit through a central tube. A theoretical centrifugal force of around 60G causes the feed solids to fill the inter-riffle spaces from bottom to top. Once these spaces are full of solids the introduction of further feed starts the sorting stages where heavy minerals displace the lighter minerals and as a result the heavy minerals are trapped in the inter-riffle spaces while the lighter minerals are carried by water to the top of the unit, hence a separation occurs. To keep the bed of heavy minerals thus formed fluidised. water is introduced through the multiple fluidisation holes in the inner shell. This fluidisation water force is expected to be strong enough to inhibit severe compaction of the heavy mineral bed due to the strong centrifugal force. The concentration mechanism in a Knelson concentrator may thus be linked to a hindered settling classifier. One of the major disadvantages of this unit is the large fresh water requirement (up to 2-3 times the feed flow) to fluidise the particle bed.
The Knelson Concentrator is a compact hatch centrifugal separator with an active fluidized bed to capture heavy minerals. A centrifugal force up to 60 times that of gravity acts on the particles, trapping denser particles in a series of rings (riffles) located in the machine, while the low-density particles are flushed out. Unit capacities range from laboratory scale to 150t/h for particles ranging in size from 10 pm to a maximum of 6 mm. It is generally used for feeds in which the dense component to be recovered is a very small fraction of the total material, less than 500 g t 1 (0.05% by weight).
Feed slurry is introduced through a stationary feed tube and into the concentrate cone. When the slurry reaches the bottom of the cone it is forced outward and up the cone wall under the influence of centrifugal force. Fluidization water is introduced into the concentrate cone through a series of fluidization holes. The slurry fills each ring to capacity to create a concentrating bed. with compaction of the bed prevented by the fluidization water. The flow of water that is injected into the rings is controlled to achieve optimum bed fluidization. High-specific gravity particles are captured and retained in the concentrating cone; the high-density material may also substitute for the low-densitymaterial that was previously in the rifflesmade possible by the fluidization of the bed. When the concentrate cycle is complete, concentrates are pushed from the cone into the concentrate launder. Under normal operating conditions, this automated procedure is achieved in less than 2 min in a secure environment.
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