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Lightweight fused corundum brick

A corundum brick and electric fusion technology, applied in the field of refractory materials, can solve the problems of poor thermal shock stability and low porosity

Active Publication Date: 2021-04-23
ZHENGZHOU XINGUANGSE REFRACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, with the development of many new processes and technologies, the requirements for the charge of glass melting furnaces and blast furnaces have become higher and higher. However, due to the low porosity of dense fused corundum bricks, the thermal shock stability is poor, so , it is necessary to develop a fused corundum brick product with moderate strength, good chemical resistance, light weight and good thermal insulation effect

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  • Lightweight fused corundum brick

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Embodiment Construction

[0022] The light-weight fused corundum brick of the present invention will be further described below in conjunction with specific examples, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0023] The invention relates to a light electric fused corundum brick, the chemical composition of which contains 93-97wt% Al 2 o 3 , 2.0~5.0wt% Na 2 O and / or K 2 O, 0.15~1.5wt% SiO 2 , 0.15-1.0 wt% of SrO, 0.05-0.20 wt% of BeO. The chemical composition also contains 0-0.5wt% of unavoidable impurities, among the impurities: BaO2 +Fe 2 o 3 2 o 3 , β-Al 2 o 3 and matrix glass phase. а-Al 2 o 3 It is a high-temperature stable phase structure with the densest structure, but it is easily converted into β-Al under high-temperature alkaline steam conditions 2 o 3 And swelling occurs, so that the corrosion resistance is significantly reduced. β-Al 2 o 3 The act...

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Abstract

The invention relates to a lightweight electric fused corundum brick, which belongs to the technical field of refractory materials. The light-weight fused corundum brick of the present invention has a chemical composition containing 93-97wt% Al 2 o 3 , 2.0~5.0wt% Na 2 O and / or K 2 O, 0.15~1.5wt% SiO 2 , 0.15-1.0wt% SrO, 0.05-0.20wt% BeO; fused corundum bricks contain а‑Al 2 o 3 , β‑Al 2 o 3 It is in the matrix glass phase, and has a dispersed porosity structure, with a porosity of 25-40%. The pore structure is formed by feeding oxygen-containing gas during high-temperature smelting, and the oxygen-containing gas is O 2 with CO 2 The mixed gas, O in the mixed gas 2 The content is 20-80v%. The light-weight fused corundum brick of the invention has moderate compressive strength, is light in weight, has good thermal insulation performance, and has excellent thermal shock resistance.

Description

technical field [0001] The invention relates to the technical field of refractory materials, more specifically, the invention relates to a lightweight fused corundum brick. Background technique [0002] Fused corundum brick is a refractory material with alumina content greater than 90% and corundum as the main crystal phase obtained by melting alumina in an electric arc furnace and casting it into a specified specific shape model, annealing and heat preservation, and then cold working. . Fused corundum bricks are generally divided into three types according to the different crystal forms and quantities of alumina, one of which is made of more than 90% а-Al 2 o 3 The fused refractory material composed of α-Al has excellent high temperature stability and is mainly used as the lining material for glass melting furnaces and graphite roasting furnaces; 2 o 3 with β-Al 2 o 3 The electro-fused refractory material mainly composed of crystal phase has excellent corrosion resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/107C04B35/622C04B38/10
CPCC04B35/107C04B35/622C04B38/103C04B2235/3201C04B2235/3205C04B2235/3213C04B2235/3418C04B2235/96C04B2235/9607C04B38/0074
Inventor 宋林祥刘西法
Owner ZHENGZHOU XINGUANGSE REFRACTORY