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A kind of corundum-spinel lightweight refractory material and preparation method thereof

A refractory material and spinel technology, which is applied in the field of refractory material production, can solve the problems of affecting the service life and reducing the anti-slag infiltration ability of the castable, and achieve the effect of high strength and high temperature service performance.

Inactive Publication Date: 2018-05-04
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have confirmed that the introduction of lightweight aggregates reduces the bulk density of the castable refractory and improves the thermal insulation performance, but at the same time reduces the ability of the castable to resist slag infiltration and affects its service life

Method used

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  • A kind of corundum-spinel lightweight refractory material and preparation method thereof
  • A kind of corundum-spinel lightweight refractory material and preparation method thereof
  • A kind of corundum-spinel lightweight refractory material and preparation method thereof

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preparation example Construction

[0021] This embodiment provides a method for preparing a corundum-spinel lightweight refractory material. The specific process includes the following steps:

[0022] Step 1: Select magnesia and carbon as the reaction raw materials, grind the raw materials to 180 mesh or below, mix them evenly according to the molar ratio of MgO and C at 1:1, and use them as pore-forming and reaction components in the fine powder in the refractory ingredients.

[0023] Step 2, batching the refractory raw materials according to a certain particle size distribution. The aggregate part can be tabular alumina, corundum lightweight aggregate or high alumina lightweight aggregate, or dense aggregate. The ratio of the aggregate part to the fine powder part is between 50-80:20-50, wherein the fine powder part contains MgO and C powder mixed in step 1. According to product requirements, the MgO and C powder account for the fine powder 20% to 70% of the powder part. In order to improve the uniformity a...

Embodiment 1

[0032] Mix 180 mesh fused magnesia and 180 mesh graphite evenly according to the molar ratio of MgO and C at 1:1. The tabular alumina of 1-3mm and the tabular grains of 0.1-1mm are used as coarse grains and medium grains respectively. Magnesia fine powder, graphite fine powder and alumina fine powder are used as the matrix part, and the ratio of coarse particles: medium particles: fine powder is 40:20:40. Among them, the ratio of the fine powder part of the alumina micropowder to the mixed powder of magnesium oxide and graphite is 2:1. Use phenolic resin ethylene glycol solution as a binder, and the addition amount is 8% of the total weight of the ingredients. After the ingredients are fully mixed, put them in an airtight container or plastic bag for 2 hours and then shape them on a hydraulic press. The molding pressure is 150MPa. The pressed sample is naturally cooled for half a day to 1 day, and then dried in the drying equipment with staged heating and heat preservation, a...

Embodiment 2

[0036]Mix 180 mesh sintered magnesia and 180 mesh graphite evenly according to the molar ratio of MgO and C at 1:1. 1-3mm and 0.1-1mm lightweight high-alumina particles are used as coarse particles and medium particles respectively. Magnesia fine powder, graphite fine powder and alumina fine powder are used as the matrix part, and the ratio of coarse particles: medium particles: fine powder is 40:20:40. Among them, the ratio of the fine powder part of the alumina micropowder to the mixed powder of magnesium oxide and graphite is 2:1. Use phenolic resin ethylene glycol solution as a binder, and the addition amount is 8% of the total weight of the ingredients. After the ingredients are fully mixed, put them in a closed container or plastic bag for 3 hours and then mold them on a hydraulic press. The molding pressure is 150MPa. The pressed sample is naturally cooled for half a day to 1 day, and then dried in the drying equipment with staged heating and heat preservation, and fin...

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Abstract

The invention discloses a corundum-spinel lightweight refractory material and a preparation method thereof. The prepared corundum-spinel lightweight refractory material can form the density gradient and bonding strength of the matrix part while maintaining low thermal conductivity Gradient, improving high temperature performance. The preparation method is to select magnesia and carbon as the reaction raw materials, place the pressed sample in the atmosphere sintering furnace, vacuumize the controllable atmosphere furnace, then fill it with Ar as protection, heat the furnace body to a certain temperature and pass O2, Magnesia and carbon undergo carbothermal reduction reaction to generate Mg vapor, Mg vapor diffuses and reacts with the incoming O2 to generate magnesia, and magnesia reacts with alumina micropowder to generate spinel to combine the sample matrix. It has the characteristics of low firing temperature, adjustable sample porosity and bulk density, high compressive strength and load softening temperature.

Description

technical field [0001] The invention relates to the technical field of refractory production, in particular to a corundum-spinel lightweight refractory and a preparation method thereof. Background technique [0002] Corundum-spinel refractories are widely used in ladle refining furnaces, RH refining furnaces, cement and lime calcining rotary kiln firing belts, and non-ferrous metal smelting due to their advantages such as high service temperature, good slag corrosion resistance, and easy availability of raw materials. The equipment has a wide range of applications. In the past, people mainly focused on the service life of high-temperature kiln lining and the consumption of refractory materials per ton of product. For this reason, high-temperature kiln lining has long relied on heavy refractory materials, which have good corrosion resistance and high service life. As the energy crisis has become one of the most concerned issues in the world, energy conservation and consumpti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B38/02C04B35/65
CPCC04B35/10C04B35/65C04B38/02C04B2235/3206C04B2235/60C04B2235/606C04B2235/6585C04B2235/77C04B2235/96
Inventor 尹洪峰高魁辛亚楼袁蝴蝶
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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