A method for preparing magnesia whiskers from waste magnesia-carbon brick-based materials

Abstract

The invention relates to the technical field of refractory materials, in particular to magnesium oxide whiskers prepared from waste magnesia-carbon brick matrix materials and a preparation method thereof. The magnesia whisker is composed of the following raw material components in weight percentage: waste magnesia carbon brick base material 90-96%, metal aluminum powder 2-5%, nano-silica powder 2-5%, with the above raw material components The total is 100%, plus 3-5% phenolic resin as a binder. The invention uses waste magnesia-carbon brick base material, which belongs to secondary waste. The utilization of the raw material solves the problem of solid waste treatment, saves a lot of treatment costs, and reduces environmental pollution at the same time.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to magnesium oxide whiskers prepared from waste magnesia-carbon brick matrix materials and a preparation method thereof. Background technique [0002] Magnesia carbon bricks have been used as the main refractory material for working linings of converters and ladles due to their good high temperature performance and excellent slag resistance. After a certain number of furnaces are used, the residual thickness of the magnesia-carbon brick becomes thinner, and the performance declines, so it will be dismantled. It belongs to steelmaking consumables. Nearly one million tons of magnesia-carbon bricks are scrapped every year in my country. Developed countries such as the United States and Japan have started research on the reuse of waste magnesia carbon bricks earlier, and the utilization rate of waste materials has increased year by year. In recent years, many scientific re...

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Problems solved by technology

The advantage of this method is that it prepares magnesium oxide whiskers with good performance. The disadvantage is that the raw materials need to go through a series of operations such as sorting and crushing, and the process is complicated; the preparation of magnesium oxide whiskers needs to be sintered in a vacuum atmosphere protection furnace, and the preparation process is complicated and industrialized. production difficulties

[0007] Among the four methods for the utilization of waste magnesia carbon bricks, due to the complicated process of ③ and ④ two methods, the application is greatly limited. Although the recycling of method ② is relatively simple, the performance of the recycled material is seriously reduced, so it can only be used in downshifts. At present, method ① is a more commonly used recycling method. Many refractory companies have established a complete waste magnesia carbon brick recycling production line. However, this method only recycles the granular materials in waste magnesia carbon bricks, and the matrix material in magnesia carbon bricks accounts for as high as 30~40%. After this part of powder is treated by method ①, it still cannot be effectively utilized , is regarded as non-recyclable material and becomes secondary waste, which can only be disposed of as garbage, which not only increases processing costs, wastes resources, but also brings environmental pollution

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