Pleonaste brick

A spinel brick and iron-aluminum spinel technology, applied in the field of magnesia-iron spinel brick, can solve environmental pollution and other problems, achieve the effect of ensuring comprehensive performance and reducing fuel consumption

Active Publication Date: 2012-10-03
郑州真金耐火材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a chromium-free magnesia-iron spinel brick that can replace directly bonded magnesia-chrome bricks. The brick body of this invention not only has the characteristics of high compressive stre

Method used

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Example Embodiment

[0013] The magnesia-iron spinel brick of the present invention is prepared by using high-purity magnesia or fused magnesia, and synthetic fused iron-aluminum spinel as main raw materials, according to the following weight ratio and method:

[0014] In the first step, weigh 45-65 parts of high-purity magnesia or fused magnesia particles, 8-12 parts of synthetic magnesium-iron-aluminum spinel particles with a particle size of less than 2mm, 0.5-2 parts of reduced iron powder of 200 mesh, 200 mesh 10-20 parts of fused magnesia fine powder, 15 parts of 325-400 mesh high-purity magnesia fine powder, plus 3-5 parts of calcium lignosulfonate solution; the particle size gradation of high-purity magnesia or fused magnesia particles is: 20-30 parts of granular material with 3mm

[0015] In the second step, the above raw materials are mixed evenly in a wet mil...

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Abstract

The invention discloses a pleonaste brick which is manufactured in the manner that high-purity magnesite or fused magnesite and synthetic fused hercynite are taken as main raw materials, reduced iron powder, and fine fused magnesite powder, fine high-purity magnesite powder and an additive (namely lignin liquor) are added, pressed into a green brick after being uniformly mixed, dried, and fired at a lower temperature under the weakly reducing atmosphere. The pleonaste brick has the advantages that through the manner that air holes are sealed through low temperature sintering and fine powder addition, divalent iron protoxide in a brick body in prevented from being converted into ferric iron at a high temperature, iron protoxide capable of prompting the coating of a rotary cement kiln to be stable in the brick body exits in a divalent state to the limit, and the brick body has better coating hanging performance and toughness. The pleonaste brick prepared by the invention breaks through the traditional method that alkaline refractory products have to depend on the high temperature firing in achieving the chrome free treatment of the brick body, ensures the comprehensive performance of the chrome free brick fired in rotary cement kiln, and reduces the fuel consumption of the refractory material in the production process.

Description

technical field [0001] The invention relates to refractory bricks, in particular to a magnesia-iron spinel brick which is safe and environment-friendly, has high compressive strength, good thermal shock stability, good thermal creep performance and high load softening temperature. Background technique [0002] Because part of the chromium in the directly bonded magnesia-chrome bricks used for a long time in the cement rotary kiln with high-temperature belt kiln lining will turn into highly toxic and carcinogenic substances when exposed to water, which will damage the environment and threaten people's health. Europe and the United States have banned it as early as the 1990s. Chromium-containing refractories are used in the cement industry. Affected by the restriction of my country's economic level and the late start of the development of cement industry and refractory material industry, my country's cement industry has been using a large number of directly combined magnesia-c...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 宋金标宋禄峰宋彩红宋马峰樊建令付鸿正赵章明詹帅锋崔潘娜
Owner 郑州真金耐火材料有限责任公司
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