Dewatering Screens
Dewatering Screens can be used to dewater -4 mesh (5 mm) particles of sand, coal, iron ore, salt, etc., as well as for limited efficiency fine sizing, washing and rinsing, desliming and organics screening.
Applications
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 handle materials 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 McLanahan Dewatering Screens; however, final moisture is dependent on surface area, surface morphology, and contact angle. Finer materials, 例如在物料100%通过100目(150微米)的细粒回收系统中处理的那些, will dewater to a drip-free consistency, which conveys and stacks, but may have a surface moisture content of more than 20%.
How Dewatering Screens Work
To dewater material effectively, slurry is fed onto a steep, 脱水筛进料端筛面向下倾斜，实现快速排水. 当物质在稍微向上倾斜的表面上积聚时，山谷中开始形成一池水. 反向旋转振动马达(或最大脱水筛上的机械激振器)产生与筛面成一定角度的直线运动，使固体以5g的速度向上和向前加速. This, along with a generous stroke length, moves water through the countless openings between 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. 脱水筛可用于有限效率细尺寸在10目或以上(2毫米)，以创建不同的菠菜网最稳定正规平台_最全菠菜网大全, for stone washing and rinsing <2” (-50 mm) aggregates prior to loadout, desliming, and for trash/organics dewatering/screening.
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Why McLanahan Dewatering Screens
McLanahan Dewatering Screens are based on the original Velco Dewatering Screens 它是在1970年代中期为矿物加工厂使用而开发的，现在是颗粒物料的主要脱水装置. McLanahan使用横梁结构增强了这种设计，使机器更坚固，更容易维护. McLanahan Dewatering Screens are designed for minimal maintenance. The bolt-together design allows for component replacement without cutting or welding. 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, 全长聚氨酯-聚氨酯接合几乎消除了工艺材料在筛管截面界面的进入, 防止在使用针套和多点支撑介质时出现麻烦的磨损点.
McLanahan率先使用纵向分隔器，允许多达三种菠菜网最稳定正规平台_最全菠菜网大全在一个屏幕上脱水. Many applications feature a two-stream process, 但麦克菠菜网最稳定正规平台_最全菠菜网大全脱水筛允许一个细流和两个粗流保持分离或混合，以创造特殊菠菜网最稳定正规平台_最全菠菜网大全.
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. 双重洗涤)可以受益于螺旋洗衣机作为主要洗涤设备，辅以脱水筛为干燥菠菜网最稳定正规平台_最全菠菜网大全.
UltraDRY Modular Dewatering Screen
Learn MoreMcLanahan的UltraDRY是一种滑板式脱水筛，可安装在任何品牌的砂螺杆下，以提高最终菠菜网最稳定正规平台_最全菠菜网大全的干燥度. 它也可以安装在倾斜方向上，使用间隔块将水力旋流器或分离器™的底流脱水到可堆叠的无滴稠度, conveyable and ready for immediate sale. The compact, modular design makes it quick and easy to set up and move from site to site as needs change.
Frequently Asked Questions About Dewatering Screens
Ask An ExpertSome 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 solids 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, 唯一剩下的水是作为薄膜吸附在外表面或作为材料本身固有的水分(一些褐煤可以含有高达20%的固有水分)。. Therefore, the finer the materials being handled and the more irregular the surface, the higher the moisture content. 某些材料也更疏水或亲水，这也影响残留水. 同样重要的是要了解脱水筛的作用对于在物料床底形成液滴至关重要. This combination of amplitude and frequency was studied by the University of Karlsruhe, which developed 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花了很长时间研究和设计，以满足需求，结果是一个纵向轨道式系统，在介质和stringers之间采用聚氨酯对聚氨酯连接——这种类型的界面不会失败. 脱水筛中介质的更换频率是这样的，没有制造商或代表会损失很多下游收入, but the end user always benefits from a better system.
在设计脱水筛的支撑结构时，需要考虑几个因素, including forces, natural frequencies and multiple unit installations. McLanahan can provide design criteria and assistance; call our offices for support or contact us now. As a quick guide, 脱水筛不应低估其以900转/分和10毫米振幅的质量动摇结构的能力. 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. 良好的设计实践包括在支撑点和坚实的基础下直接放置柱子以提供质量. 在动作方向(与筛管纵向)上，与其他部件保持3英寸(75毫米)的间隙，这样当振动电机或激振器在关闭过程中失相时，不会产生冲击. 电缆应始终从上方直接支撑/悬挂在接线盒上，不得悬挂在振动部件上. McLanahan的脱水筛电机配有密封的接线盒，带有长电缆连接到电路中.
McLanahan’s personnel pioneered the use of deck-dividers to allow two or even three products to be dewatered at one time. 一边生产优质菠菜网最稳定正规平台_最全菠菜网大全，另一边生产粗劣菠菜网最稳定正规平台_最全菠菜网大全，并配有混合设备，这是麦克菠菜网最稳定正规平台_最全菠菜网大全标准菠菜网最稳定正规平台_最全菠菜网大全的一部分. Process engineers will assist with the application to ensure all factors are considered. 大量的不平衡负载(一个或多个菠菜网最稳定正规平台_最全菠菜网大全长时间不喂料)会降低设备的使用寿命.
The smallest aperture on a Dewatering Screen is typically 50 mesh (0.3毫米)，因此您将期望在屏幕的下流中看到一些该尺寸的碎片和更细的碎片. 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.
McLanahan Dewatering Screens produce a consistent, drip-free product with as low as 7% moisture content.
Features & Benefits
- Cleaner operating environment with less conveyor spillage to clean up
- Easier belt cleaning and lower conveyor maintenance costs
- Consistent drip-free discharge
- Steeper stacking angles with a drier product
- Better stockpile management with shorter inventory cycle
- Less water around stockpiles for reduced wear on mobile equipment
- Rinse and dewater on the same screen
- Dewater multiple products on one machine using divided deck design
- Upward inclination for consistent dewatering and feed surge capacity
- Less water lost to waste and improved housekeeping
- Control of gradation with Hydrocyclone or sieve bend based recycle system
- Huck bolted, crossbeam construction for rigidity and ease of maintenance
- Heavy-duty urethane screen media and attachment system