Method for measuring real density of double-density bottle powder

A pycnometer and true density technology, which is applied in the direction of specific gravity measurement, measuring devices, instruments, etc., can solve the problems of unstable temperature of pycnometer, many steps in the measurement process, and short time required, so as to save working time and improve reliability. Operability and accuracy remain unchanged

Inactive Publication Date: 2005-09-07
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0013] However, in actual operation, the following situation often occurs: it takes a long time for the temperature of the pycnometer to stabilize after it is placed in the thermostat, but the time required for the liquid level in the capillary of the pycnometer to drop to the scale is relatively

Method used

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Examples

Experimental program
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Effect test

example

[0037] Apparatus: Pycnometer A is a pycnometer with a capacity of 50ml, and pycnometer B is a pycnometer with a capacity of 5ml. Distilled water is used to measure the volume of the pycnometer, xylene is used as the medium liquid, and the room temperature is 20°C.

[0038] Determine the volume of bottle A:

[0039] The mass of the large bottle m a

23.8552g

Mass after being filled with distilled water m 1

(Temperature 20°C)

71.5426g

71.5422g

71.5417g

[0040] Find the volume V of the pycnometer A according to the formula (1) a = 47.7730ml.

[0041] The mass of the vial m b

10.4202g

Mass after filling with distilled water m 4

15.1048g

15.1048g

(Temperature 20°C)

15.1046g

[0042] Calculate the volume V of bottle B according to formula (2) b = 4.7406ml.

[0043] After loading the quartz powder

B bottle mass m 3

A bottle...

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PUM

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Abstract

The invention relates to a method of measuring the real density of the powder using double density bottles, which including the following steps: 1) weighing the quality of the density bottle A and B with the mass of ma and mb accurately, filling the bottle with agent fluid and weighing the quality m1, m2, checking the dielectric fluid density Rho0 corresponding to the temperature, compute the volume of the two bottle va, vb; 2) filling the bottle B with the powder to be measured, weighing the quality m3, and m[sample]=m3-mb; then filling the agent fluid to the surface of the powder 4.8-5.2mm, putting it to the vacuum chamber and pumping to the critical boiling point, keeping 28-32 minutes until the air bubble in the powder space output completely; 3) filling the agent fluid to bottle A,B at the same time, measuring the quality of bottle A m4, bottle B m5; 4) computing the sample's mass density according to the following formula: rho[sample]=m[sample]/v[sample]=(m3-mb)(m4-ma)/[(m4-ma)vb-(m5-m3)va].

Description

technical field [0001] The invention relates to a method for measuring the true density of powder. Background technique [0002] True density is an important indicator of the physical properties of materials. The true density value can be used to identify minerals, and it also has an auxiliary effect on the composition and structure analysis of artificial synthetic materials. [0003] The traditional method of measuring the true density of powder is the pycnometer method, the principle of which is to use the drainage method to measure the true volume V of the powder, and then calculate the true density according to the mass of the powder. The operation steps are briefly introduced as follows: [0004] 1. Accurately weigh the mass m of the pycnometer 0 , fill the pycnometer with mercury (or pure water), put it into a constant temperature box with a prefabricated temperature, and when the liquid column in the capillary drops to the scale, take it out quickly and weigh its m...

Claims

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Application Information

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IPC IPC(8): G01N9/02G01N9/36
Inventor 刘昊何涌
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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