Method and device for testing heating sintering characteristics of solid-state continuous casting covering slag

Abstract

The invention discloses a method and a device for testing heating and sintering characteristics of solid-state continuous casting covering slag. Volume strain data of the solid continuous casting covering slag in a heating state are detected in real time under the condition of constant pressure stress or regular change of the pressure stress, and the heating sintering characteristic of the solid continuous casting covering slag is obtained by analyzing a temperature-volume strain curve. The device comprises a vacuum chamber which is connected with a vacuum system through a vacuum pipe; a baseis arranged at the bottom in the vacuum chamber, a barrel-shaped graphite container is arranged on the base, a heater is arranged outside the barrel-shaped graphite container, a hard partition plate is arranged in the barrel-shaped graphite container, a hard pressing head is connected to the upper portion of the hard partition plate, and the upper end of the hard pressing head extends out of the vacuum chamber and then is connected with a telescopic cylinder with pressure and displacement detection. A temperature thermocouple is arranged at the bottom of the barrel-shaped graphite container, and the temperature thermocouple, the vacuum system and the telescopic cylinder are connected to a computer. The method has the characteristics of relatively accurate detection result and relatively small error.

Description

technical field [0001] The invention relates to a method and a device for testing the characteristics of solid continuous casting mold flux, in particular to a method and a device for testing the heating and sintering characteristics of solid continuous casting mold flux. Background technique [0002] Solid continuous casting mold flux is an important auxiliary material in continuous casting of iron and steel metallurgy, generally composed of various oxides and fluorides. In the process of continuous casting of steel, mold slag plays an important role in controlling the heat transfer from the billet shell to the mold, isolating air to prevent the oxidation of molten steel, keeping the liquid steel surface warm, lubricating the billet shell, and absorbing floating inclusions in molten steel. [0003] During the continuous casting process, the mold slag is evenly added to the surface of the molten steel in the mold. After being heated, the solid mold slag is sintered and melte...

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Problems solved by technology

[0005] Due to the complex environment in the mold and many factors affected, it is currently difficult to simulate the sintering atmosphere and process of mold slag in the mold, and to effectively evaluate the sintering tendency of different mold slags in the laboratory

At present, the air permeability characteristics of the mold flux are generally tested. By evaluating the air permeability characteristics of the mold flux after the temperature rises, the change of the density of the mold flux is reflected, and then the starting temperature of the sintering of the mold flux is qualitatively evaluated. Because this method needs to pass through the external gas to detect the real-time pressure on both sides of the slag column. Poor, the slag sample temperature is greatly affected by the external gas, the slag sample temperature deviation is large, and it is easy to be uneven, it is difficult to fully and accurately reflect the mold slag sintering process, and the error is large

There is also a method to evaluate the sintering tendency of different mold slags by using the density change of the slag sample after heating and cooling, but important data such as sintering start temperature and sintering rate cannot be detected

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