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Difference of several kinds of solid-liquid separation equipment in sand washing


Solid-liquid separation is the removal of suspended solids from water or wastewater.  In theory, solid-liquid separation process can be divided into three categories of sedimentation, filtration, centrifugation, these three methods in aggregate processing system is widely used in wastewater treatment process equipment mainly include: spiral classifier, cyclone, filter press, plate and frame type and box type filter press), ceramic filter, rubber belt type vacuum filter, etc.

screw sand washing machine

1,Spiral classifier

The spiral classifier has the functions of sand washing, classification and dewatering. In general, the rotary speed of the spiral classifier is relatively low. The bottom end is equipped with stirring blade paddle, wide overflow port and long fuselage, which is conducive to dewatering.


Hydraulic cyclone is a type of classifier, which uses centrifugal force for classification and dewatering of fine materials.The overflow particle size range is generally used to concentrate slurry and recover fine sand, and the water content of the sand after dewatering by hydrocyclone is about 20-26%.

3,Filter press

The filter press is divided into plate and frame filter press, side filter press and vertical filter press.It is generally used as the end mechanical treatment mode of solid-liquid separation in the wastewater treatment of sand and gravel system.

Compared with other solid-liquid separation equipment, the mud cake filtered by the filter press has higher solids content and better separation effect. It can conduct the final dehydration treatment of sludge and stone powder, meet the requirements of loading and transportation, and the separated water can be directly discharged or recycled.

4,Ceramic filter

Ceramic filter is also the end mechanical treatment mode of sludge and stone powder in wastewater treatment. This type of equipment can not only conduct the final dehydration treatment of sludge and stone powder to meet the requirements of loading and transportation, but also can directly discharge or recycle the filtered water.Moreover, it has the advantages of large processing capacity, simple operation and continuous operation.



5,Rotary cylinder centrifuge

The rotary cylinder centrifuge uses the centrifugal enrichment method. Centrifugal enrichment uses the solids (i.e., sludge) in the sludge, and the density of the liquid (i.e., water) is very different. Therefore, the centrifuge with different centrifugal force in the high-speed rotation, so that the two can be separated.

6,Rubber belt filter vacuum machine

The rubber belt vacuum filter has the characteristics of continuous operation and continuous filtration.The filtration, washing, slag discharge and cloth cleaning of the production process can be completed successively with the operation of the belt, and the moisture content of the filtered solid particles can be controlled below 16%.


In a word, the selection of structures and equipment should be determined according to the specific characteristics of the sand and stone processing system. It is necessary to ensure the normal operation of the waste water treatment system and control the operating cost to achieve energy saving and emission reduction.




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