Sand hydraulic classification method and device

Abstract

The invention relates to a sand hydraulic classification device comprising a plurality of hydraulic classification chambers. The lower part of each hydraulic classification chamber is provided with a discharge port, the upper portion of each hydraulic classification chamber is provided with a liquid injection port and an overflow port, and several spray pipes are arranged in each hydraulic classification chamber; and each of the spray pipes is provided with a flow control device. When the sand hydraulic classification device is used, sand suspension liquid is introduced through the liquid injection port of the first-stage hydraulic classification chamber, water flows are poured into the spray pipes in each hydraulic classification chamber, and the water flows are adjusted to be at a predetermined flow velocity by the flow control devices. Because the flow rates of the injected water flows are different, the buoyancy force applied to sands in suspension liquid in each hydraulic classification chamber is different, the particle grades of sands which are settled and overflowed are different, and by controlling the flow velocity of the injected water flow in each hydraulic classification device, sands in different particle grades can be obtained. The sand hydraulic classification device is simple in structure, good in classification effect and low in cost, and is energy-saving and environmentally-friendly.

Description

technical field [0001] The invention relates to a hydraulic grading method for sand, in particular to a hydraulic grading method and device for making sand from construction waste. Background technique [0002] At present, sand is mostly classified by screens. On the one hand, this method wears out the screens and needs to be replaced frequently, which increases costs. On the other hand, it will cause secondary pollution of dust. In addition, the sieve mesh has a relatively poor classification effect on sand below 2mm, and it is difficult to meet the requirements of high-quality aggregate production. Contents of the invention [0003] The object of the present invention is to overcome the above disadvantages and provide a sand hydraulic grading method and device with simple structure, good grading effect, low cost, energy saving and environmental protection. [0004] The object of the present invention is achieved in the following way: a hydraulic classification device fo...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the sand is classified by screens. On the one hand, this method wears out the screens and needs to be replaced frequently, which increases the cost. On the other hand, it will cause secondary pollution of dust.

In addition, the sieve screen is also relatively poor in grading sand below 2mm, and it is difficult to meet the requirements of high-quality aggregate production

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