Pleonaste brick

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...

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 strength, but also has the advantage of being easier to stick to the kiln than directly bonded magnesia-chrome bricks. The characteristics of the skin effectively solve the problem of environmental pollution caused by traditional magnesia-chrome bricks

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