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A kind of preparation method of lightweight refractory material

A refractory material and lightweight technology, applied in the field of refractory material production, can solve the problems of low thermal conductivity, high corrosion resistance, etc., and achieve the effect of high strength and high temperature performance

Inactive Publication Date: 2019-01-22
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fabrication of lightweight refractory materials with gradient density by magnesia carbothermal reduction transport oxidation combined with reaction sintering to solve the contradiction between high erosion resistance and low thermal conductivity

Method used

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  • A kind of preparation method of lightweight refractory material
  • A kind of preparation method of lightweight refractory material
  • A kind of preparation method of lightweight refractory material

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preparation example Construction

[0024] This embodiment provides a kind of preparation method of lightweight refractory material, comprises the following steps:

[0025] Step 1: Select magnesia and carbon as the reaction raw materials, grind the raw materials to be less than 0.088mm, mix them evenly according to the molar ratio of MgO and C at 1:1, and use them as part of the fine powder part of the refractory ingredients.

[0026] Step 2, batching the refractory raw materials according to a certain particle size distribution. The aggregate part can be lightweight aggregate or dense aggregate. Generally, the ratio of aggregate to fine powder 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 Part of 20% to 70%. In order to improve the uniformity of product quality, the fine powder part needs to be blended for 30 minutes to 90 minutes, so that the components can be mixed evenly.

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Embodiment 1

[0035]Mix 180 mesh 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 to trap the materials for 2 hours. The trapped materials are semi-dry. Molded on a hydraulic press with a molding pressure of 150MPa. The formed sample is naturally cooled for half a day to 1 day, and then dried in the drying equipment with...

Embodiment 2

[0039] Mix 180-mesh magnesia and 180-mesh graphite according to the molar ratio of MgO and C at 1:1. The light-weight spinel particles of 1-3mm and 0.1-1mm 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 an airtight container or a plastic bag for 4 hours; mold them on a hydraulic press with a molding pressure of 150MPa. The good samples are naturally cooled for half a day to 1 day, and then dried in the drying equipment with staged heating and heat preservation methods, and finally ke...

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Abstract

The invention discloses a method for preparing a lightweight refractory material. The prepared lightweight refractory material improves its high-temperature service performance while maintaining low thermal conductivity. The preparation method is to select magnesia and carbon as the reaction raw materials, put 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, magnesium Carbothermal reduction reaction occurs between sand and carbon to generate Mg vapor. Mg vapor diffuses and reacts with the incoming O2, and the matrix part of the sample is combined by forming high-temperature refractory phases such as magnesium oxide or spinel. Density gradients and binding strength gradients of the matrix fraction are formed. The prepared lightweight refractory material is dense on the outside and porous on the inside, which can well balance low thermal conductivity and anti-infiltration performance. The method has the characteristics of low firing temperature, adjustable sample porosity and volume density, high compressive strength and load softening temperature.

Description

technical field [0001] The invention relates to the technical field of refractory material production, in particular to a preparation method of lightweight refractory material. Background technique [0002] The refractory materials used for the lining of high-temperature kilns are generally composed of dense aggregate and matrix (except for cast refractory materials). Therefore, the proper weight reduction of the heavy aggregate should not greatly reduce the strength and medium erosion resistance of the refractory material. For this reason, the concept of lightweight refractory materials is proposed in the refractory industry to distinguish them from light refractory materials and heavy refractory materials. By introducing aggregates with high porosity (especially closed porosity) instead of dense aggregates, dense aggregates are prepared. A type of refractory material whose density is higher than light weight but lower than heavy weight refractory is used in the working li...

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 尹洪峰辛亚楼高魁袁蝴蝶
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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