high frequency dewatering screen, efficient multi frequency dewatering screen, professional manufacturer of dewatering screen - xinhai
[Improvement]: The high-frequency dewatering screen adopts a method of drilling holes on the side of the sieve plate, allowing part of the water to flow out of the hole quickly, speeding up the dehydration speed, and also avoiding the damage caused by water splashing on the motor.
The product adopts a double vibration motor as a power supply: The two motors that rotate synchronously and reversely and centrifugal force is produced by two groups of eccentric block. This makes the screen body periodical to-and-fro moving along the direction of a straight line, which is for dehydration. The screen frame is connected by high-intensity bolts, so the structure is stable and durable.
dewatering screens | mclanahan
Dewatering Screens have a wide variety of applications, including dewatering, desliming, degritting, rinsing, scrubbing, sizing and washing. They are designed to produce a consistent drip-free product and handlematerials such as sand, gravel, crushed aggregates, frac sand, industrial sands, mineral sands, hard rock, precious metals ore, coal, iron ore, salt and other granular materials.
Surface moisture as low as 7% has been achieved with McLanahanDewatering Screens; however, final moisture is dependent on surface area, surface morphology, and contact angle. Finer materials, such as those processed in fines recovery systems where the material is 100% passing 100 mesh (150 m), will dewater to a drip-free consistency, which conveys and stacks, but may have a surface moisture content of more than20%.
McLanahan Dewatering Screens are based on the original Velco Dewatering Screens that were developed for use in mineral processing plants in the mid-1970s and are now the predominant dewatering device for granular materials. McLanahan enhanced this design using a crossbeam structure that makes the machine more robust and easier to maintain. McLanahan Dewatering Screens are designed for minimal maintenance, with no cutting or welding required. They require little operator training when installed and produce minimal noise.
Another improvement from the original design, McLanahan engineered its screen media for heavy-duty applications. This media features longitudinal stringers for full-length support. Tight tolerance, full-length urethane-to-urethane engagement virtually eliminates the entry of the process material at screen section interfaces, preventing troublesome wear points that can occur when using pin-and-sleeve and multi-point supported media.
McLanahan pioneered the use of longitudinal dividers to allow as many as three products to be dewatered on one screen. Many applications feature a two-stream process, but McLanahan Dewatering Screens allow up to one fine stream and two coarse streams to be kept separate or blended to create specialty products.
When compared with the typical Fine Material Screw Washer, the final product will generally be at least 10% drier with a McLanahan Dewatering Screen. Because of the wide range of equipment within McLanahan, the Dewatering Screen can be combined to complement other process equipment, such as Screw Washers, Hydrocyclones and Separators. Certain types of washing processes (e.g. double wash) can benefit from a Screw Washer as a primary washing device supplemented by the Dewatering Screen for a drier product.
To dewater material effectively, slurry is fed onto a steep, downward inclined screen surface at the feed end of the Dewatering Screen to achieve rapid drainage. A pool of water begin forms in the valley as material builds up on the slightly upward inclined surface. Counter-rotating vibratory motors (or mechanical exciters on the largest of Dewatering Screens) create a linear motion at an angle to the screen surface that accelerates the solids upward and forward at 5 G. This, along with a generous stroke length, moves water through the countless openingsbetween the particles to promote droplet formation.
The abrupt reversal of motion detaches water from the material, and the water droplets pass through the screen media. The solids are conveyed up the screen by this linear motion. The uphill slope of the screen, along with a discharge weir, creates a deep bed that acts as a filter medium, allowing retention of material much finer than the screen openings.A thick bed of material promotes fine retention while allowing the water to migrate through.
Where cleaner materials are required, cross dams and spray bars can be included to assist with the washing process, liberating fines that pass through the media. Using a dilute feed and additional spray water, these screens can effect some limited sizing.
Dewatering Screens can beused to dewater -4 mesh (5 mm) particles of sand, coal, iron ore, salt, etc. They can also be used to dewaterfines in fines recovery circuits, typically +400 mesh (+38 m), as well as to rinse and dewater jig discharge nominally -2 (50 mm). Dewatering Screens can be used for limited efficiency fine sizing at or above 10 mesh (2 mm) to create differential products, for stone washing and rinsing <2 (-50 mm) aggregates prior to loadout, desliming, and for trash/organics dewatering/screening.
Some applications have experienced a moisture content as low as 7% with McLanahan Dewatering Screens, but final moisture content is dependent on both surface moisture and inherent moisture. When reporting moisture by weight (kg water/kg pulp), the specific gravity of the soilds also plays a factor, with higher specific gravity materials showing lower moisture contents.
If you remove all the water from the gaps between the particles, the only water left is that which is adsorbed as a thin film on the outside surface or as inherent moisture within the material itself (some brown coals can contain up to 20% inherent moisture). Therefore, the finer the materials being handled and the more irregular the surface, the higher the moisture content.
Certain materials are also more hydrophobic or hydrophilic,which also affects the residual water. It is also important to understand that a Dewatering Screens action is critical to creating droplet formation on the underside of the bed of material. This combination of amplitude and frequency was studied by the University of Karlsruhe, whichdeveloped recommendations for this action.
In the early days of Dewatering Screens, urethane pin and sleeve design media was common. Since then, parallel developments occurred, rated capacities increased (doubling in some cases) and more robust media designs came about. Today, pin and sleeve style designs are perfectly adequate and appropriate for sizing screen applications; however, with the heavy loads and aggressive action on Dewatering Screens, few media manufacturers can match the mechanical integrity required for the application.
McLanahan spent a long time researching and working on designs to match the need and the result is a longitudinal rail style system with urethane-to-urethane connections between the media and the stringers --this type of interface doesnt fail. The frequency of replacement of media in Dewatering Screens is such that no manufacturer or representative is going to lose much downstream revenue, but the end user always benefits from a better system.
Several factors need to be taken into consideration when designing a support structure for a Dewatering Screen, includingforces, natural frequencies andmultiple unit installations. McLanahan can provide design criteria and assistance; call our offices for support or contact us now.
As a quick guide, Dewatering Screens should never be underestimated in their ability to shake a structure with their mass and the 900 rpm and 10 mm amplitude. Multiple Dewatering Screen installations can be a challenge with harmonics; occasionally a beat will be experienced. In some cases, vibration transference through the ground can be experienced in other structures.
Good design practices include placing columns directly under the support points and substantial foundations to provide mass. Always allow 3 (75 mm) of clearance to other components in the direction of action (longitudinal to the screen) so no impact occurs when the vibratory motors or exciters go out of phase during shut down. Electric cables should always be supported/suspended from above directly to the junction box and neverdraped over vibrating components. McLanahans Dewatering Screen motors come with sealed junction boxes with long extended cablesto connect into the electrical circuit.
McLanahans personnel pioneered the use of deck-dividers to allow two or even three products to be dewatered at one time. Producing a fine product on one side and a coarse product on the other with the facility to blend is part of the standard offering from McLanahan. Process engineers will assist with the application to ensure all factors are considered. Extensive out-of-balance loading (one or more of the products not being fed for long periods of time) can decrease the lifespan of the equipment.
The smallest aperture on a Dewatering Screen is typically 50 mesh (0.3mm), so you will expect to see some of that size fraction and finer in the underflow of the screen. Not all of that fraction will pass through due to the very nature of caking style screens; fines are captured in the bed formed on top of the media. The usable fraction that does pass through the screen can be handled in several ways. The easiest is to recycle back to the device feeding the screen. In cases of greater flows, a dedicated scavenger circuit could be used.
Designed to produce a consistent, drip-free product that other types of equipment cannot provide, Dewatering Screens dewater, deslime, degrit, rinse, scrub and wash a variety of materials. McLanahan Dewatering Screens are designed for minimal maintenance, with no cutting or welding required. They require little operator training when installed along and produce minimal noise. With the highest capacities available in the industry, McLanahan Dewatering Screens can process up to 400 tph of coarse sand on a single machine.
mine tailings, tailings in mining, gold tailings reprocessing, tailings re-processing line - xinhai
[Introduction]: Xinhai tailings re-processing line, with the thought of protecting ecosystem and fully using resources, provide a re-processing for those valuable metal or non-metal tailings. According different property of all kinds of ore tailings, Xinhai can design reasonable process and fully find the value in the tailings.
[Application]: Xinhai tailings re-processing line applies to re-processing of various metal or non-metal tailings, including iron, gold, lead-zinc, copper, fluorite, wolfram, phosphate, graphite, bauxite, etc.
The iron tailings discharge from iron ore plant is in large amount, fine size and different types, and complex property, so Xinhai use the process of magnetic separation, flotation, acid leaching and flocculation to recover iron.
Xinhai usually use all-slime cyanide process and carbon-in-pulp process to recover the gold from gold tailings. As for the gold tailings cyaniding, xinhai will apply the method of dry-tailing stacking. That is, though the process of classifying and dewatering, at the same recycling the water recourses to remove the cyanide in it. Moreover, xinhai will use magnetic separation and gravity separation to remove the iron.
The main component of the lead-zinc tailings are quartz and suicide sericite. Except the methods of stockpiling in tailings pool, dry-tailing stacking and mine filling, Xinhai will also apply gravity separation, flotation separation, magnetic separation, gravity - flotation separation, and other process to recycle the valuable elements.
If the copper with high heavy metals content, the separation will be easier and apply the process of flotation. If there exist magnetite in the copper tailings, it will firstly using acid leaching to precipitate the copper, then use magnetic separation accordingly.
Xinhai will apply gravity separation, magnetic separation and flotation separation to recycle the wolfram. The gravity separation is commonly used. Wolfram tailing re-selection process is mainly used spiral chute and centrifugal ore separator to roughing, shaking table and flotation to cleaning.
Xinhai will use the process of stage grinding and screening to recover the graphite from tailings. In the process of separation, flotation and shaking table is always used. If we want to achieve comprehensive recovery of several kinds of minerals from graphite tailings, we should combine several separation methods.
30tph rock lead zinc process plant in morocco - jxsc machine
Material: rock type lead zinc ore Capacity: 30TPH Country: Morocco Feeding size: 0-400mm Raw mineral description: 1. Mineral composition: lead 6%, zinc 5% Customers requirements: 1. Target concentrate: lead >45%, zinc >45% 2. Gravity separator to process 0-2mm ore
JXSC has been focusing on mining equipment manufacturing since 1985. Products: rock crushers, gravity separator, electrostatic separator, flotation machine, washing equipment, ore feeder, screen & sieve, etc. Application: metallurgical, mineral processing, sand making, aggregate processing, etc. Contact us for quotation
Notes: 1. Services (installation, test run, training) : the supplier can provide basic drawings and schematic drawings of equipment installation. The domestic technicians will be provided for free to guide installation and debugging, and the buyer will provide technicians with room and board. The buyer shall prepare necessary auxiliary materials for installation. 2. Quality guarantee: the equipment is guaranteed for one year. In the warranty period, due to the quality of the product manufacturing, manufacturers free warranty (except wearing parts).
copper lead zinc ore flotation plant - pineer mining machinery
Flotation is a benefication method based on the hydrophobicity difference of the mineral surface. While the copper mineral is usually in the form of sulfuration exiting in the mineral. Its natural floatability is good, so flotation is the main method of extracting the copper ore. According to the processing order of the useful mineral, the copper ore processing/mining can be divided into precedence flotation, equivalent flotation, mixed flotation and partial flotation. The process choice of copper ore flotation is determined by the raw ore properties.
Meanwhile, there are many determined factors for copper ore flotation process, like the mineral disseminated particle size, the associated relationship with quartz rock and the gangue mineral types. Only taking full consideration of the factors and using the proper process, it can efficiently recycle the useful copper mineral from the raw ore.