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A kind of periclase-spinel lightweight refractory material and its preparation method

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: 2018-07-03
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 periclase-spinel lightweight refractory material and its preparation method
  • A kind of periclase-spinel lightweight refractory material and its preparation method
  • A kind of periclase-spinel lightweight refractory material and its preparation method

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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 an airtight container or a 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 an...

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Abstract

The invention discloses a periclase-spinel lightweight refractory material and a preparation method thereof. The prepared periclase-spinel lightweight refractory material has a density gradient from outside to inside, and the outside is a dense outer layer, while The interior is porous, the dense outer layer endows the material with anti-infiltration performance of the working medium, and the interior porosity endows the material with thermal insulation performance. The preparation method is to select magnesia and carbon as the reaction raw materials, place the pressed sample in the atmosphere sintering furnace, evacuate the controllable atmosphere furnace, then fill it with Ar as protection, heat the furnace body to a certain temperature and feed O2, magnesium Carbothermal reduction reaction occurs between sand and carbon to generate Mg vapor, Mg vapor diffuses and reacts with O2 to generate magnesium oxide, oxidizes to generate magnesium oxide or reacts 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 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 Patents(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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