Fine sediment grading device and method

Abstract

The invention discloses a fine sediment grading device and method. The fine sediment grading device sequentially comprises a sediment adding barrel (4), a sedimentation transition barrel (3), a sediment grading barrel (2) and a base (1) which are sleeved with one another from top to bottom, wherein the sediment grading barrel (2) is composed of an upper barrel (5) and a lower barrel (6); control valves are arranged in a position, close the top, of the upper barrel (5) and a position below the middle of the lower barrel (6); a rotary switch is arranged at the bottom of the sediment adding barrel (4); a rod body (9) is arranged on the rotary switch. According to the fine sediment grading method, sediment particles in a certain particle size range can be separated by opening and closing the control valves. The device is simple in structure, convenient to clean, suitable for batch processing of sand samples, high in grading precision and good in flexibility, can separate sediment particles with the fine particle range of 2-62 microns; the method is easy to operate and high in applicability. If the device is long enough, the device can be used for separating sediment particles with the particle size range of 62-2000 microns; the particle size of the separated sediment is the settling particle size, and conversion between two particle sizes is avoided.

Description

technical field [0001] The invention belongs to the field of particle size classification of fine-grained sand, and relates to a fine-grained sand classification device and method, in particular to a device for classifying fine-grained sand using the principle of different sedimentation velocities in still water for fine-grained sand and methods. Background technique [0002] The physical, chemical and movement characteristics of suspended sediment are one of the core issues in the study of river dynamics. Suspended matter is the main part of sediment transport, and most of them are fine-grained sediment; at the same time, the finer the sediment particle size, the stronger the adsorption and desorption capacity of river pollutants, so the physical and chemical effects of fine-grained sediment in river sediment The research on the characteristics and movement rules of the sediment has become particularly important, and it is necessary to propose an efficient fine-grained sed...

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Problems solved by technology

[0009] The invention provides a fine particle sediment classification device and method, which solves the following technical problems in the prior art: fine sieve holes and filter membrane holes are easily blocked; filter membrane area, and the sediment suitable for water elutriation Concentration and centrifuge tube volume are limited, sand samples cannot be processed in batches; in the natural sedimentation method, the sand samples are poured directly into the measuring cylinder, and the sediment sedimentation has an initial velocity; and the existing classification methods cannot directly obtain the sediment of a certain particle size. repeatedly

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