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Spiral classifier


Kobesh machine’s classifiers manufacturing with 3 types: Spiral classifiers, Bucket and rake classifiers.

Coarse material washers
Coarse Material Washers are used to wash coarse sand or crushed stone and gravel to dewater the cleaned material sufficiently so it can be conveyed to storage. They are also used, in some installations to assist with the removal of lignite, mica, bark, leaves and trash. They are manufactured in single and double spiral configurations with various sizes of spiral diameters and tank lengths.

Fine material washers
Fine Material Washers are used to separate water and silt from sand while dewatering the sand. Sand discharged from a Fine Material Washer is dry enough to carry on a belt conveyor to storage. These units are built in single and twin screw units with a large settling area for best salvage of fine sands. Available in various size of spiral diameters and spiral lengths. .


Spiral classifier properties:


Spiral classifier



Technical data are approximates and should be used as guide only. Capacity and power requirements depend on the type and characteristic of the feed material.

The hydrasander is used for dewatering and removing the slit content from wash sand. The large diameter bucket wheel, long fines recovery spiral and low power requirements enables these units to be both efficient and cost-effective.
Each hydrasander has a contra-flow screw recovery spiral fitted in the claim are of the tank. This spiral plays a very important role when the product to be processed contains a high percentage of fine or lower density particles. Depending on the waterfowl rate a certain percentage of bottom fines can escape first pass recovery and they are then influenced by the water flow along the settlement tank towards the weir system at the opposite end. As these fine particles move along they gravitate towards the tank bottom and into contact with the spiral blades. These influence a contra-flow system nudging the escaping fines back into the recovery buckets. In general the contra-flow spiral system maximizes efficiency of particle recovery and overall output.

Hydrosander properties: