Ladle filler sand for continuous-casting high aluminum steel and use method thereof

Abstract

The invention discloses ladle filler sand for continuous-casting high aluminum steel. The sand is formed by evenly mixing, by weight, 29-37% of quartz sand used as skeleton materials, 52-60% of chromium ore used as base materials, 9-12% of carbon powder used as addition agents, and 0.5-2% of phenolic resin used as binding agents. The invention further discloses a use method of the ladle filler sand for the continuous-casting high aluminum steel. The method comprises the steps of firstly conducting roasting pretreatment on the ladle filler sand, then adding the ladle filler sand into a water opening, and enabling the ladle filler sand to exceed5-15mm relative to the plane of a well block of the water opening. By the adoption of the ladle filler sand and the use method, the steel ladle self-opening rate is effectively improved, efficiency is improved, operation is convenient, labor intensity is reduced, the sand is free of pollution and meets the process requirement, in the sand discharging process, the ladle filler sand can smoothly flow out along with molten steel, and slag inclusion in a steel ingot is reduced.

Description

technical field [0001] The invention relates to drainage sand, more particularly, to a drainage sand for continuous casting of high-alumina steel and a method for using the same. Background technique [0002] In the steelmaking operation, the ladle carrying molten steel passes through the sliding nozzle at the bottom to exhaust the molten steel. Before the molten steel is poured into the ladle, powdered refractory materials must be poured into the sliding nozzle. Its purpose is to avoid direct contact between the high-temperature molten steel and the nozzle, and to avoid the melting loss of the sliding nozzle and cause production accidents. [0003] The traditional drainage sand is easy to form a thick sintered layer under the action of molten steel to block the sliding nozzle, and the molten steel cannot flow out of the sliding nozzle normally due to such blockage. Operators sometimes have to use oxygen cutting to cut through the blocked material. This is extremely danger...

AI Technical Summary

Problems solved by technology

And because the elements Al and O 2 It has a great affinity, and it is easy to react with oxygen and combine with other compounds to produce many flocs, which adhere to the periphery of the nozzle, affecting the quality of molten steel and normal pouring;

[0007] 2. The steel receiving time of this type of steel is too long, and the current average receiving time of steel is more than 200 minutes, which is far longer than that of similar steel plants, resulting in a long-term contact between the high-temperature molten steel and the drainage sand, resulting in an excessively thick sintered layer. As a result, the ladle cannot be opened or poured normally;

[0008] 3. Since the ladle is elongated, the flow field in the ladle is not very uniform, especially when there is only a single air-permeable brick, because the bubbles at the bottom cannot be distributed in a large area in the molten pool during the rising process, but are in an offset state, that is, argon The stirring effect is not uniform, and the molten steel cannot effectively form a circulation loop, resulting in a dead zone near the nozzle, and the temperature is low, and finally the ladle nozzle cannot be opened normally due to the uneven temperature in the ladle;

[0010] According to the current situation, high chromium drainage sand has a better self-opening effect on general steel grades, but it is still unsuitable for steel grades containing high aluminum and steel grades that have been exposed to steel for a long time. Can not effectively improve the ladle self-opening rate

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