Testing method for measuring physical properties of soft structure particles and application method of testing device

A test device and physical property technology, applied in the direction of measuring device, particle and sedimentation analysis, particle size analysis, etc., can solve the problems of multiple scattering, weak aggregate damage, inaccurate measurement results, etc., and achieve the effect of expanding the scope of application

Inactive Publication Date: 2017-01-18
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the aggregates (flocs) produced by the flocculation of low-concentration solutions can be continuously flocculated online, and at the same time, the conventional laser particle size analyzer is used to monitor the particle size distribution and fractal shape. Conditions or some high-concentration solutions (such as mud) cannot be monitore

Method used

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  • Testing method for measuring physical properties of soft structure particles and application method of testing device
  • Testing method for measuring physical properties of soft structure particles and application method of testing device
  • Testing method for measuring physical properties of soft structure particles and application method of testing device

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Embodiment 1

[0031]The conventional rigid particles are measured by using the present invention to verify whether the present invention can be first applied to the measurement of conventional particles. The rigid particles used are: a kind of Taihu Lake dredging silt particles, the silt particles are small, used to compare and verify whether there will be interfering air bubbles during the measurement process; a standard sandy soil, with a large specific gravity, used for comparison and verification Whether it will settle during the measurement process and cause measurement inaccuracy. In this embodiment, the parameters of the test device are set as follows: select a 1.5L Erlenmeyer flask with 750ml of distilled water inside, the speed of the orbital oscillator is set at 280rpm, the particle refraction index of the laser particle size analyzer is set at 1.555, and the absorption index is set at 1.555. 0.1, the refractive index of the dispersant is set to 1.330, the peristaltic pump is set ...

Embodiment 2

[0034] Two types of flocculated aggregates were measured using the present invention to illustrate the effect of the present invention on the measurement of physical properties of weak structures. The flocculation aggregates used are: the aggregates formed by adding 0.5% cationic polyacrylamide to the dredging sludge particles of Taihu Lake for 240s; In this embodiment, the parameters of the test device are set as follows: select a 1L Erlenmeyer flask with 800ml of distilled water inside, the speed of the orbital oscillator is set to 220rpm, the particle refraction index of the laser particle size analyzer is set to 1.555, and the absorption index is set to 0.1, the refractive index of the dispersant is set to 1.330, the peristaltic pump is set to 5ml / s, and the diameter of the wide-mouth straw is 5mm. Firstly, after the device is debugged and connected, the background value of the dispersion is measured first, and then the measurement is started by adding a sample to the Erle...

Embodiment 3

[0037] The present invention is compared with the stirring mode that replaces the orbital oscillator with a magnetic stirrer, and the measurement material is Taihu Lake dredging sludge particles. The present invention uses a 2L Erlenmeyer flask, and the magnetic stirrer stirring speed is set to 250rpm, and the orbital oscillator oscillation speed is 250rpm. Set to 250rpm, the rest of the measurement parameters are the same, the measurement results are as follows Figure 4 shown.

[0038] Depend on Figure 4 It can be seen that the particle size distribution will have a large deviation when the magnetic stirring method is used, which is caused by a large number of air bubbles generated during the magnetic stirring process.

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Abstract

The invention discloses a testing device for measuring physical properties of soft structure particles and an application method of the testing device. The testing device comprises a conical flask, a convolutional oscillator, a laser particle analyzer, a peristaltic pump, a widemouthed sucker, a plastic pipe and a computer. The conical flask serving as a sample chamber for uniformly mixing the soft structure particles is fixed on the convolutional oscillator; samples in the conical flask are uniformly mixed through oscillating stirring of the convolutional oscillator; the peristaltic pump is used for supplying pumping force to enable the samples in the conical flask to enter the laser particle analyzer to perform particle property monitoring; the widemouthed sucker serves as a sample taking and injecting tool; the computer is used for analyzing the data of the monitored soft structure particles. The testing device remedies the defects of conventional measurement methods, can obtain the physical properties, such as particle size distribution and fractal dimension of particles, of the soft structure particles in the condition that soft particle structures are not destroyed basically, and is particularly applicable to the measurement of the properties of aggregates (flocs) be divorced from the original flocculation conditions and aggregates (flocs) which cannot be directly subjected to on-line flocculation monitoring by the laser particle analyzer.

Description

technical field [0001] The invention relates to a test device for measuring the physical properties of granules and a method for using the same, which is especially suitable for measuring the physical properties of weak structure granules. Background technique [0002] In the field of solid-liquid separation, the physical properties of particles such as particle size distribution and fractal dimension will affect the effect of solid-liquid separation. For some muds that are difficult to dewater, such as sewage from sewage plants, dredging mud, etc., the fine particles are generally formed into aggregates (flocs) by adding flocculants to promote the separation of mud and water. Determining the size of aggregates formed by flocculation is of great significance for studying the process of mud-water separation, predicting the effect of mud-water separation, and optimizing flocculants and process parameters in the flocculation process. [0003] Because the aggregates (flocs) pro...

Claims

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Application Information

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IPC IPC(8): G01N15/02
CPCG01N15/0205
Inventor 朱伟吴思麟闵凡路范惜辉刘泉韩婷婷
Owner HOHAI UNIV
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