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Magnetic floating density separation measurement method based on general anti-magnetic properties of materials

A density separation and measurement method technology, applied in the direction of material analysis through observation of sunken objects, etc., to achieve the effects of extensive density-related detection, easy observation, and simple device operation

Inactive Publication Date: 2018-02-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] These known density measurement methods are simple in principle, but the disadvantage is that it is difficult to measure the density difference with high precision
In order to improve the accuracy of density measurement, it is usually necessary to use large-scale electrical equipment, which has brought great limitations to density-related research.

Method used

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  • Magnetic floating density separation measurement method based on general anti-magnetic properties of materials
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  • Magnetic floating density separation measurement method based on general anti-magnetic properties of materials

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Embodiment 1

[0047] Such as figure 1 Shown is a schematic diagram of the magnetic levitation device of the present invention, including a magnet, a medium solution, a test sample, and a transparent medium solution container. The floating height of the tested sample in the solution is z.

[0048] In this experimental example, the magnets are all long 100mm × 10mm × 10mm long magnets, and the magnetic induction intensity of the center surface in the direction of thickness magnetization is 0.3T.

[0049] The present invention is 0.3T magnet to long 100mm * wide 10mm * high 10mm surface magnetic induction intensity, the magnetic flux density flow of the xOz plane component that crosses the vertical center line is as follows figure 2 shown.

[0050] In the present invention, for a magnet whose surface magnetic induction intensity is 0.3T with a length of 100mm×width 10mm×a height of 10mm, the relationship between the magnetic flux density flow at the vertical center line and the height h is ...

Embodiment 2

[0066] Adopt this method to edible oil (density is about 0.7~0.9g / cm 3 ) oil droplets for density measurement, the medium solution is 1.2mol / L of MnCl 2 methanol solution.

[0067] After the sample was fully cleaned, it was placed in MnCl 2 In the methanol solution, place the transparent container holding the sample in the device and let it stand fully. When the position of the sample is stable, the height of the floating sample is obtained with a paper ruler or image collection, and the density of the sample is obtained after calculation. Through observation, the floating height of the oil droplet is read as 7.4mm, which is substituted into the formula, and the calculated density is 0.9320g / cm 3 .

[0068] The calculation formula of the suspension detection method for the above-mentioned density is as follows:

[0069]

[0070] In the formula, ρ s is the density of the tested sample, g / cm 3 ; ρ m is the density of the medium solution, g / cm 3 ; s is the magnetic s...

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Abstract

The invention discloses a magnetic floating density separation measurement method based on general anti-magnetic properties of materials. The method includes a step (1) of constructing a magnetic floating experimental device, and simulating a magnetic floating effect of a magnetic field on an object by physical modeling; a step (2) of determining the approximate density of a material of a to-be-tested sample, and then determining the density of a paramagnetic medium solution; a step (3) of placing a transparent container containing the to-be-tested sample and the paramagnetic solution in a magnetic flotation device and performing full standing, wherein the magnetic flotation device is provided with an adjustable number of strip-shaped magnets with like poles opposite; a step (4) of obtaining floating height information of the tested sample by means of visual observation and picture collection; and a step (5) of calculating sample density and performing density-related studies. Comparedwith the prior art, the magnetic floating density separation measurement method has the outstanding advantages that a device required by the method is simple and convenient to operate and low in cost, measurement results are easy to observe, measurement accuracy is high, and high-precision density-related test applications can be carried out under limited conditions.

Description

technical field [0001] The invention relates to a density detection method, in particular to a magnetic levitation density separation measurement method based on universal diamagnetism of substances. Background technique [0002] Density is one of the basic physical properties of matter, and different substances generally have different densities. Different microstructures of substances and differences in material composition will also be reflected in differences in density. Therefore, density measurement has important value and practical significance in life, production and scientific research. [0003] Density is defined as the mass of a substance per unit volume. It was first proposed and measured by Archimedes. Based on the measurement method proposed by him, hydrometers, density gradient columns, pycnometers, oscillating tube densitometers and other instruments have come out one after another. The definition of density Both are basic formulas: ρ=m / V. [0004] These c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/14G01N9/18
CPCG01N9/14G01N9/18
Inventor 于海东欧阳启然李林张承武刘志鹏刘金华黄维赖琼宇焦钰翠宗丽君朱成显
Owner NANJING UNIV OF TECH
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