Non-burning permeable brick for steel ladle bottom argon bubbling and preparation process thereof

Abstract

The invention discloses a non-burning permeable brick for steel ladle bottom argon bubbling and a preparation process of the non-burning permeable brick. The non-burning permeable brick for steel ladle bottom argon bubbling comprises the following components by weight: 65-85 of tabular corundum, 6-14 of spinel, 5-10 of a-Al2O3, 4-8 of CMA cement, 0.3-0.8 of pore-forming agent and 0.3-0.8 of dispersing agent. According to the non-burning permeable brick, the problems that the strength at low temperature and moderate temperature is low, and the strength inflection point exists in the moderate temperature, the volume of each temperature section is not stable, and cracks can be generated easily in the use process can be solved; a novel composite binding agent is selected, so that the linear change rate of the permeable brick is reduced, the stable volume of each temperature section is realized, and the strength of the permeable brick at moderate temperature and the low temperature is improved; uniform micro pores are formed by adopting a pore forming technology, so that the heat-resistance and vibration-resistance stable performance and the anti-corrosion performance of the permeable brick are improved; and the non-burning permeable brick has the advantages that the using performances are equivalent to those of a sintered product, the sintering cost is lowered, the production cycle is shortened by more than four days, and the like.

Description

technical field [0001] The invention relates to the field of high-temperature ceramics, in particular to a non-fired ladle bottom-blown argon venting brick for external refining of a steel-making ladle and a preparation process thereof. Background technique [0002] At present, most of the ladle bottom blowing argon permeable bricks used at home and abroad have been treated at 1500 °C, which not only has high combustion costs, but also has a long production cycle, correspondingly, the production cost is relatively high. In order to shorten the production cycle, achieve energy saving, emission reduction, cost reduction and consumption reduction, some research institutions and enterprises at home and abroad have started the research on non-fired ladle bottom blowing argon ventilation bricks, but the progress and effect are not satisfactory. In foreign countries, a very small number of companies represented by Vesuvius have adopted the technology of non-fired ladle bottom b...

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Problems solved by technology

[0002] At present, most of the ladle bottom blowing argon ventilation bricks used at home and abroad are treated at 1500 °C, not only the combustion cost is high, but also the production cycle is long, correspondingly, the production cost is relatively high

In order to shorten the production cycle, achieve energy saving, emission reduction, cost reduction and consumption reduction, some research institutions and enterprises at home and abroad have started the research on non-burning ladle bottom blowing argon ventilation bricks, but the progress and effect are not satisfactory.

In foreign countries, a very small number of companies represented by Vesuvius have adopted the technology of non-fired ladle bottom blowing argon permeable bricks, but most of them have added steel fibers to the product formula to improve the quality stability of the product, but in this way As a result, the corrosion resistance of the product is reduced

At present, there are few institutions or companies in China that research on non-burning ladle bottom blowing argon permeable bricks.

In the prior art, there are the following problems that urgently need to be overcome in the non-fired ladle bottom blowing argon permeable brick: (1) The product has low strength at medium and low temperatures, and there is an inflection point of strength at medium temperature; (2) The volume of the product is unstable at each temperature range, and the use process (3) The use effect of unfired products is worse than that of fired products; (4) The cost of firing is high; (5) The production cycle is long

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