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Method for improving slag permeation resistance of refractory aluminum-chromium material

A refractory material and slag penetration technology, which is applied in the field of refractory materials, can solve the problems of high price of aluminum chromium materials, high maintenance and replacement costs, and long cycle, so as to improve the resistance to slag penetration, prolong the service life, and improve the service life Effect

Inactive Publication Date: 2016-02-17
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the aluminum-chromium refractory has a highly connected pore structure, the liquid slag will penetrate into the material along the pores after contacting the aluminum-chromium refractory, causing the dissolution, composition and microstructure changes of the refractory, cracks and peeling, etc., thus damage to the material
Due to the high price of aluminum-chromium refractory materials, especially those with high chromium content, and the high cost of repair and replacement after damage, the cycle is long, which seriously affects the production and operation of enterprises.

Method used

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  • Method for improving slag permeation resistance of refractory aluminum-chromium material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: The chemical composition of the industrial cinder analyzed in a certain area of ​​Anhui, my country is: 45.31wt%SiO 2 , 20.75wt%Al 2 o 3 , 10.41wt%Fe 2 o 3 , 19.51wt%CaO, 0.89wt%MgO, 1.31wt%Na 2 O, 1.05wt%K 2 O and 0.77wt%TiO 2 . Mechanically grind the above coal slag and select analytically pure MnO 2 The powder is used as an additive, and the cinder added with the additive is fully mixed and pre-melted, and the Mn content in the adjusted slag is 20.33wt%. Cr 2 o 3 Cr content about 50wt% 2 o 3 -Al 2 o 3 Bricks were prepared into crucible samples, and the slag of the above ratio was used to carry out the static crucible slag resistance test according to the national standard, and the test temperature was 1600 o C, the time is 5h. The sample after the experiment was analyzed, and the maximum penetration depth of the sample was 12mm.

Embodiment 2

[0014] Example 2: The industrial slag in Example 1 is mechanically ground, and the selected additive is analytically pure MnO 2 and Mn 3 o 4 powder, and Fe 2 o 3 and Fe 3 o 4 Powder, the cinder with additives is fully mixed and pre-melted, and the Mn content in the adjusted slag is 15.09wt%, and the Fe content is 15.05wt%. Cr 2 o 3 Cr content about 50wt% 2 o 3 -Al 2 o 3 Bricks were prepared into crucible samples, and the slag of the above ratio was used to carry out the static crucible slag resistance test according to the national standard, and the test temperature was 1600 o C, the time is 5h. The sample after the experiment was analyzed, and the maximum penetration depth of the sample was 10mm.

Embodiment 3

[0015] Embodiment 3: the industrial slag in embodiment 1 is carried out mechanical grinding, and the selected additive is analytically pure MnO 2 and Mn 2 o 3 Powder, Fe 2 o 3 Powder and MgO powder, the cinder added with additives is fully mixed and pre-melted. After adjustment, the Mn content in the slag is 15.01wt%, the Fe content is 15.02wt%, and the Mg content is 4.26wt%. Cr 2 o 3 Cr content about 50wt% 2 o 3 -Al 2 o 3 Bricks were prepared into crucible samples, and the slag of the above ratio was used to carry out the static crucible slag resistance test according to the national standard, and the test temperature was 1600 o C, the time is 5h. The sample after the experiment was analyzed, and the maximum penetration depth of the sample was 8mm.

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Abstract

The invention belongs to the technical field of refractory materials and particularly relates to a method for improving slag permeation resistance of a refractory aluminum-chromium material. The method for improving the slag permeation resistance of the refractory aluminum-chromium material comprises the steps that Mn oxide is added into slag in a high-temperature furnace, the slag is modified by Mn oxide under the high temperature, and the modified slag is made to react with Cr2O3 and Al2O3 in the aluminum-chromium material to form MnCrAl2O4 and MnAl2O4 spinel structure layers, wherein the content of Mn in the modified slag under the working temperature is at least 15wt%, the content of (Mn+Fe+Mg) in the modified slag under the working temperature is at least 25wt%, and Mn oxide is one or more of MnO, MnO2, Mn2O3 and Mn3O4. By means of the method, permeation of the slag is reduced; the slag permeation resistance of the refractory aluminum-chromium material is improved, and the service life of the refractory aluminum-chromium material is prolonged.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a method for improving the slag penetration resistance of aluminum-chromium refractory materials. Background technique [0002] Aluminum chromium refractories are widely used in high-temperature furnaces such as coal gasifiers, waste incinerators, and non-ferrous metal smelting furnaces. Among them, the aluminum-chromium material with high chromium content has become an irreplaceable lining material for coal-water slurry gasifier. [0003] The service environment of aluminum-chromium refractories in high-temperature furnaces is complex, and they are also subjected to high temperature and liquid slag erosion. The aggressive slag produced by the high temperature furnace at operating temperature mainly consists of SiO 2 、Al 2 o 3 , Fe 2 o 3 , MgO, CaO and other oxides. Since the aluminum-chromium refractory has a highly connected pore structure, the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 赵世贤蔡斌利鲁志强孙红刚李鹏涛王刚
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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