Rapid testing method for surface tension of molten slag based on heat wire method

A technology of surface tension and test method, applied in the direction of surface/boundary effect, measuring device, material thermal analysis, etc., can solve the problem of long heating time of high temperature furnace, and achieve the effect of fast heating speed and high precision

Active Publication Date: 2018-12-11
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of long heating time of high-temperature furnaces in the traditional surface te

Method used

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  • Rapid testing method for surface tension of molten slag based on heat wire method
  • Rapid testing method for surface tension of molten slag based on heat wire method
  • Rapid testing method for surface tension of molten slag based on heat wire method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0042] Example 1

[0043] 1# Test slag sample composition:

[0044] Table 1- 1# experimental residue sample composition (mass%)

[0045] Element

[0046] Use chemically pure reagents to prepare 1# slag sample components, melt and homogenize the prepared slag samples at 1400 ℃ for 40 minutes, then quench the homogenized slag samples with water, and finally quench the slag samples with water and grind them through a 200-mesh sieve , the slag sample for surface tension test was prepared.

[0047] The schematic diagram of the hot wire method is as follows: figure 1 shown. According to the above experimental steps, the slag sample was formed on a platinum-rhodium wire thermocouple at 1500 °C. figure 2 Droplet shape shown in 2. figure 2 1 is the positive electrode of the platinum-rhodium wire thermocouple, 2 is the molten droplet, and 3 is the negative electrode of the platinum-rhodium wire thermocouple. The process of droplet shape analysis is to adjust the size a...

Example Embodiment

[0050] Example 2

[0051] 2# Test slag sample composition:

[0052]Table 2- 2# experimental residue sample composition (mass%)

[0053] Element

[0054] The preparation method and operation process of the experimental slag samples are the same as those in Example 1. The contact angles on both sides of the 2# slag sample were 63.60° and 61.30°, respectively, with an average value of 62.45°. The interfacial tension value of 2# slag sample and platinum-rhodium wire thermocouple at 1600 ℃ is 2116.00mN / m, and the interfacial tension value of platinum-rhodium wire thermocouple is 2370.00mN / m.

[0055] Substitute the above known data into the Young'-s equation to obtain the surface tension value of 2# slag sample by hot wire method of 549.13mN / m. According to the surface tension data obtained experimentally in the literature, the surface tension value of the 2# slag sample is 543.30 mN / m (see "Slag Atlas 2nd Edition", Verlag Stahleisen GmbH, Düsseldorf, 1995, 448). Ther...

Example Embodiment

[0056] Example 3

[0057] 3# Test slag sample composition:

[0058] Table 3 3# experimental residue sample composition (mass%)

[0059] Element

[0060] The preparation method and operation process of the experimental slag samples are the same as those in Example 1. The contact angles on both sides of the 3# slag sample were 56.00° and 54.00°, respectively, with an average value of 55.00°. The interfacial tension value of 3# slag sample and platinum-rhodium wire thermocouple at 1500℃ is 2116.00mN / m, and the interfacial tension value of platinum-rhodium wire thermocouple is 2370.00mN / m.

[0061] Substitute the above known data into the Young'-s equation to obtain a surface tension value of 432.11mN / m measured by the hot wire method of the 3# slag sample. According to the surface tension data obtained experimentally in the literature, the surface tension value of the 3# slag sample is 418.70 mN / m (see "Slag Atlas 2nd Edition", Verlag Stahleisen GmbH, Düsseldorf, 199...

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Abstract

The invention discloses a rapid testing method for the surface tension of molten slag based on a heat wire method. The rapid testing method comprises the following steps: raising the temperature in aheat wire method device and enabling a slag sample with the granularity greater than 200 meshes to be in contact with a high-temperature thermocouple wire so as to smelt the slag sample; adjusting thesize of slag sample molten drops and enabling an observation surface to be parallel to a water level; photographing a contact picture of the slag sample molten drops and the thermocouple wire; processing the contact picture of the slag sample molten drops and the thermocouple wire to obtain a contact angle theta; calculating the surface tension of the slag sample molten drops by utilizing the following equation: gammas=gammasl+gammal costheta, wherein gammas represents surface free energy of the thermocouple wire, the gammasl represents the tension of a thermocouple wire and molten slag interface, gammal represents the surface tension of the molten slag and theta represents the contact angle. According to the rapid testing method, the surface tension of the molten slag can be rapidly obtained; surface tension data calculated by the method provided by the invention has a very high matching degree with an accepted surface tension experiment testing data value and has very high precision; and the temperature rising time is only about 1min and the temperature rising speed is rapid.

Description

technical field [0001] The invention belongs to the technical field of slag surface tension testing, and in particular relates to a rapid testing method for slag surface tension based on a hot wire device. Background technique [0002] The hot wire method (Single Hot Thermocouple Technique, SHTT) is a technology that measures temperature and heats through thermocouples. Combining hot wire technology with imaging technology and control technology, a hot wire device can be obtained. The typical structure is as follows: figure 1 shown. Because the hot wire method device has the characteristics of small sample size, fast heating and heating speed (30K / s), high heating temperature (1873K), fast cooling speed (150K / s) and simple operation, it is widely used in glass, ceramics and industrial Research on heating and melting in the field of slag, continuous cooling process crystallization and constant temperature crystallization. [0003] As an important parameter of slag, surface...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01N25/00
CPCG01N13/00G01N25/00
Inventor 文光华王哲唐萍侯自兵刘强
Owner CHONGQING UNIV
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