How To Deal With The Serious Loss Of Fine Sand

Date: Mar. 13, 2021

In the sand washing industry, the sand washing machine is one of the necessary equipment in the sand production line. In the wastewater of wet sand washing, fine sand and surface sand will inevitably be lost with the flow of water, and each production line will probably lose 5%-25% of the content. If these lost parts are collected, it will bring considerable profits to the business again. This article shares four methods of fine sand recovery for your reference.

However, no matter what kind of sand washing machine, in the process of stirring the water source, most of the sand will inevitably be taken up, and the separation will not be clear while flowing away along with the water tank. Then inevitably caused most of the loss.

Four methods of fine sand recovery

1. Establish a multi-stage sedimentation tank

 multi-stage sedimentation tank

The sand washing wastewater flows into the sedimentation tank, preferably equipped with 3 layers, which settle layer by layer over time. Because the proportion of sand and mud is heavier, they can be separated after a long time of precipitation. Of course, this method also has drawbacks. The long-term sedimentation process takes up a large area of the sedimentation tank, and the latter requires manual excavation of sedimentation sand and sedimentation mud, which is time-consuming and labor-intensive.

2. Equipped with dewatering screen equipment

dewatering screen equipment

The sand washing wastewater is directly discharged to the surface of the linear dewatering screen to recover the lost fine sand.
The disadvantage is that there is little or no mud in the raw material, there will be no problem, but if there is too much mud, the last link will be useless, and it will not be able to recycle at all. What is recycled is still a mixture of mud and sand.

3. Configure fine sand recovery machine

fine sand recovery machine

The wastewater from sand washing is directly discharged to the lower water tank part of the fine sand collector, and the mixed sand and muddy water is pumped to the cyclone separator and discharged onto the screen surface by the slurry pump. The fine sand part is discharged along the screen surface, and the mud and water are discharged. It flows back to the lower water tank to form a cycle, continuously extracting sand from the wastewater.

4. Add chemical agents

chemical agents

Discharge the lost sand and water into the sink, and add a chemical agent that can cause the mud and sand to quickly condense into flocs, to achieve the rapid separation of sand and water. However, this method is mostly used in the coal slime industry to recover and use refined coal and fine coal. The use in sand and gravel yards has certain limitations and cannot be popularized for the time being.

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