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Method for inhibiting desolvation of zirconia metering nozzle stabilizing agent

A technology for sizing nozzles and stabilizers, which is applied in the field of inhibiting desolvation of zirconia sizing nozzles and stabilizers, and can solve the problems of increasing amount of chromium-containing industrial waste, complex production process, complex equipment structure and operation, etc.

Inactive Publication Date: 2014-07-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The problems caused by the quick change mechanism of the sizing nozzle of the tundish are the complex production process, complex equipment structure and operation, the increase in the amount of chromium-containing industrial waste, and the increase in production costs

Method used

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  • Method for inhibiting desolvation of zirconia metering nozzle stabilizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1, prepare ZrO by weight percentage 2 :Al 2 o 3 : MgO=50:40:10 The first gel, the second gel and the third gel are mixed and stirred to prepare a mixed gel. The mixed gel was aged for 15 hours, vacuum suction filtered at -0.095MPa, washed with deionized water until silver nitrate could not detect Cl - Then react at 500°C for 1h, the temperature rises to 700°C, react for 5h for degumming, and after the reaction is completed, ball mill for 10h to obtain ZrO with an average particle size of 1.24μm 2 -Al 2 o 3 - MgO composite powder;

[0039] Step 2, according to the mass ratio of 50:50, take 5 kg each of magnesia partially stabilized zirconia particles and magnesia partially stabilized zirconia fine powder, and add ZrO 2 -Al 2 o 3 - 0.45 kg of MgO composite powder. Partially stabilized zirconia fine powder with magnesia and ZrO 2 -Al 2 o 3 -MgO composite powder mixed and co-milled for 36 hours to ensure ZrO 2 -Al 2 o 3 - Uniform distribution of MgO comp...

Embodiment 2

[0042] The difference between this embodiment and embodiment 1 is: the ZrO in the step one 2 -Al 2 o 3 -ZrO of MgO composite powder 2 :Al 2 o 3 : MgO=40:45:15, even ZrO 2 -Al 2 o 3 -Al in MgO composite powder 2 o 3 / MgO ratio is closer to the theoretical composition of magnesium aluminum spinel; the addition of ZrO in step two 2 -Al 2 o 3 -MgO composite powder is 4.0%, that is to ensure that the amount of alumina introduced remains unchanged. The modified zirconia composite sizing nozzle composite inner layer is prepared, and its service life can reach 37h.

Embodiment 3

[0044] The difference between this example and Example 1 is that the sintering temperature in step 3 is adjusted to 1720° C. to obtain a composite inner layer of modified zirconia composite sizing nozzle, and its service life can reach 34 hours.

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Abstract

The invention discloses a method for inhibiting the desolvation of a zirconia metering nozzle stabilizing agent. The method comprises the following steps: preparing a ZrO2-Al2O3-MgO composite powder by a gel-sol method; controlling the proportion and granularity of the ZrO2-Al2O3-MgO composite powder, mixing magnesium oxide stabilized zirconia particles and the ZrO2-Al2O3-MgO composite powder in a certain ratio, jointly grinding for 24-28 hours, mixing the jointly-grinded powder, the magnesium oxide stabilized zirconia particles and a proper amount of binding agent, isostatically pressing for molding, drying for 24 hours at 105+ / -5 DEG C, and calcining at 1,700-1,720 DEG C to prepare a composite inner layer of the modified zirconia composite metering nozzle, wherein the service life of the composite inner layer can be 33 hours. Residual sample microscopic structure analysis indicates that the number of desolvation of the stabilizing agent is extremely small, and the zirconia particles hardly have phase-change cracking.

Description

technical field [0001] The invention relates to a process for preparing a material modification for a device for controlling molten steel flow in a continuous casting tundish in the iron and steel metallurgy industry, in particular to a method for inhibiting the desolvation of a zirconia-based sizing nozzle stabilizer. Background technique [0002] The sizing nozzle refers to a functional device made of high-temperature structural ceramics installed at the bottom of the continuous casting tundish. Its main function is that the static pressure of the molten steel in the tundish remains basically unchanged, the molten steel flows into the crystallizer through the sizing nozzle, and the crystallizer is cooled by a large flow of water to take away the heat released when the molten steel solidifies, so that the molten steel solidifies into a billet. Since the heat taken away by the water cooling of the mold is limited, the amount of molten steel flowing into the mold per unit tim...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 薛群虎赵亮武志红李翔
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY