The McLanahan Lites-Out™ Flat Bottom Classifier is a variation of a hindered settling classifier. It was developed, 将低比重物料从高比重物料中分离出来. The lighter and smaller particles report to the overflow launder, 而较粗和较重的物料则通过底部的阀门排出.
在卸料上缺乏脱水锥是平底分级机得名的地方. 分类器的平底性质允许植物的进料高度低于地面, taking up less room. Some areas have height restrictions on industrial installations, 而life Out™可以提供满足这些限制的途径. 此外，较低的扬程高度降低了所需的泵送马力和结构要求.
平底分类器与其他阻碍沉降分类器有何不同
life Out™的操作方式与许多受阻的分类器不同.
On/off underflow valve
The first is the on/off action of the underflow valve. 开/关特性处理饲料吞吐量的突然波动, especially when the unit is underfed. Many hindered settling classifiers use a modulating valve, 哪一种可能很难在沮丧的情况下保持稳定的控制. 开/关设置引起脉冲型放电，以诱导摇摆床的跳汰作用. 这种方法有助于稀释河床，释放出较粗的有机物, like lignite, through the fluidized bed.
Level sensor
Secondly, the dart valves or plungers are controlled by a sensor, which monitors the overflow of the unit. 传感器对溢流比重进行间接测量. By looking at the overflow, 由于存在任何更高比重的材料而导致浆体比重增加时，阀门可以打开.
更传统的方法是用一个量规来测量摇晃床的高度. 这样就可以将摆床高度用作工艺控制点, 而平底分级机保持较深的床深，以促进比重分离.
Diffusion plate and plenum chamber
Finally, instead of teeter bars, 该Lites Out™注入水通过扩散板从静压室. 在扩散板上不同的摇摆喷嘴之间，水压通常更均匀. The amount of teeter nozzles is also significantly increased. This can create a particularly stable teeter bed. The outlet ports extend down through the plenum chamber, and for the large units, there are multiple ports to prevent rat-holing.
Applications for Flat Bottom Classifiers
一个阻碍沉降分级器提供了所有湿重分离设备中最尖锐的分离, 平底分类器的方法略有不同. 虽然它的工作原理与所有阻碍分类器相同, 上面描述的差异适用于几个应用程序.
Organics removal
life - out™分类器利用率最高的应用是有机物去除, such as in soils washing or lignite removal.
砂粒和有机物之间比重的显著差异使粗粒的分离成为可能, 轻颗粒进入溢流带细砂(当量重量颗粒).
For example, when trying to remove lignite from a C33 concrete sand, the lignite may have a specific gravity between 1.4 and 1.7, while the typical specific gravity for concrete sand is 2.65 or 2.7. The difference between the two minerals can be as great as 1.3.
If contaminated by lignite, the C33 sand is not accepted for use in several markets, 由于混凝土中褐煤的存在会产生空隙，从而降低混凝土的强度. 不同的地区使用相似的标准，这有时被称为颜色测试. The test gauges the visible amount of lignite in the sand.在褐煤普遍存在的地区，平底分级机的使用对褐煤影响砂的市场价值产生了重大影响.
摇摇晃晃的水带着细沙，褐煤向上燃烧，越过堤坝, 而清洗后的沙子则从机组底部排出. The overflow can be run over a sieve bend (static, (弧形筛)分离较大的有机物，保留较小的砂粒.
In most cases, 去除较大的有机物就足以满足要求, 但第二阶段处理筛子弯曲底流可以进一步从沙子中去除较轻的有机物质. The second stage can be approached a number of ways, including the use of a second Flat Bottom Classifier. 由于该流的粒度级配窄得多，因此分离更为明确.
Mineral separation
同时对从砂土中去除褐煤的实例进行了详细的评述, 任何时候，矿物之间的比重都有显著差异, a Lites-Out™ Classifier can perform a separation. The rule of thumb is if there is at least a 0.7矿物之间的差异，一个有效的分离可以发生使用平底分级机. 矿物之间的差异越大，分离越干净.
In the mineral sands industry, 平底分级机与螺旋分级机一起用于将砂从高比重矿砂中分离出来. The higher density or coarser solids, which discharge from the underflow, can be gravity fed to the next process stage, or sent directly to Dewatering Screen(s) for final dewatering and conveying to stockpiles.
When dealing with some iron ore deposits, 平底分级机可以将脉石物料送入溢流，大大提高铁矿的选矿浓度，使铁矿进一步加工.
平底分级机是一组设备的一部分，专门用于分离不同比重的物料. 在许多应用中，它们与各种夹具和螺旋一起工作. 因为他们每个人都以自己的方式攻击相同的过程, when put together, they can achieve improved results. Whether alone or combined with other equipment, 平底分类器可以在湿应用中发挥所需的作用.
