Periclase-spinel light-weight 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 effects of high strength, high temperature service performance and low thermal conductivity.

Inactive Publication Date: 2016-08-10
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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  • Periclase-spinel light-weight refractory material and preparation method thereof
  • Periclase-spinel light-weight refractory material and preparation method thereof
  • Periclase-spinel light-weight refractory material and preparation method thereof

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preparation example Construction

[0020] This embodiment provides a method for preparing a periclase-spinel lightweight refractory material. The preparation process includes the following steps:

[0021] 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.

[0022] Step 2, batching the refractory raw materials according to a certain particle size distribution. The ratio of the aggregate part to the fine powder part is 50-80:20-50, wherein the fine powder part is spinel fine powder and MgO and C powder mixed in step 1. According to the product requirements, the MgO and C powder account for 20% to 70% of the fine powder part; in order to improve the uniformity and stability of product quality, the fine powder part needs to be blended for 30 minutes to 90 minutes, so that the components ca...

Embodiment 1

[0033] Mix 180 mesh fused magnesia and 180 mesh graphite evenly according to the molar ratio of MgO and C at 1:1. The spinel particles of 1-3 mm and 0.1-1 mm are used as coarse particles and medium particles respectively. Magnesia fine powder, graphite fine powder and spinel 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 spinel fine powder 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, they are placed in an airtight container or a plastic bag to trap the materials for 2 hours; Form the sample on the hydraulic press, the forming pressure is 150MPa, and the formed sample is naturally cooled for half a day to 1 day, and then dried in the drying equipment by means of stage heating ...

Embodiment 2

[0037] Mix 180 mesh sintered magnesia and 180 mesh graphite evenly according to the molar ratio of MgO and C at 1:1. 1mm~3mm and 0.1~1mm lightweight spinel are used as coarse 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, they are placed in a closed container or plastic bag to trap the material for 2 hours; the trapped material is formed on a hydraulic press. The molding pressure is 150MPa, and the molded samples are naturally cooled for half a day to 1 day, and then dried in the drying equipment with staged heating and hea...

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Abstract

The invention discloses a periclase-spinel light-weight refractory material and a preparation method thereof. The refractory material has gradient density from the exterior to the interior, wherein the exterior is a compact external layer and the interior is porous. The compact external layer enables the material to have a performance of resisting work medium infiltration and the inner porous material enables the material to have a heat insulation performance. The preparation method includes the steps of: 1) with magnesite and carbon as reaction raw materials, pressing a test sample and placing the test sample in an atmosphere sintering furnace; 2) vacuumizing the atmosphere-controllable furnace, feeding air for protection, heating the furnace to certain temperature and feeding oxygen so that the magnesite and carbon are subjected to carbon thermal reduction to generate magnesium vapor; and 3) generating magnesium oxide by diffusing the magnesium vapor to contact with the oxygen, wherein the magnesium oxide generated through oxidization or the spinal generated through the reaction enables a matrix part of the sample to be combined. The material is low in sintering temperature, is adjustable in sample porosity and volume density, and is high in compression strength and refractoriness under load.

Description

technical field [0001] The invention relates to the technical field of refractory production, in particular to a periclase-spinel lightweight refractory and a preparation method thereof. Background technique [0002] Periclase-spinel refractories have advantages in thermal equipment such as RH refining furnaces, cement rotary kilns, and glass kiln lattices due to their advantages such as high service temperature, good slag corrosion resistance, thermal shock resistance, and easy availability of raw materials. Wide range of applications. As the energy crisis has become one of the most concerned issues in the world, energy conservation and consumption reduction have become the main control and assessment indicators for governments and enterprises. With the in-depth research on refractory materials, scientific and technological workers have proposed the concept of lightweight refractory materials. The volume density of this type of refractory materials is between light refract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/66C04B35/622
CPCC04B35/622C04B35/66C04B38/0022
Inventor 尹洪峰高魁辛亚楼袁蝴蝶
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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