Chromium-aluminum steel ladle drainage sand

Abstract

The invention discloses chromium-aluminum steel ladle drainage sand, which comprises 60-70 parts of chromium ore, 10-20 parts of high-aluminum ore, 10-20 parts of desert sand and 10-20 parts of performance modifier. In the chromium-aluminum steel ladle drainage sand, chromium ore and aluminum ore are main materials, an appropriate amount of the performance modifier is added to prepare a steel ladle diversion material, the automatic cast-on rate of steel ladle is improved; by improving the high-aluminum ore with fixed content, accurate control on the thickness of a sintering layer is realized, steel leakage is prevented, and the thickness of the sintering layer is between 6 and 8 millimeters; moreover, due to high smoothness of the high-aluminum ore, the chromium-aluminum steel ladle drainage sand has good drainage effect, and the automatic cast-on rate of the drainage sand is improved to a great extent.

Description

technical field [0001] The invention belongs to the technical field of continuous steel casting, and mainly relates to drainage sand for a chrome-aluminum ladle. Background technique [0002] Drainage sand is used as the filling material for the nozzle at the bottom of the ladle. On the one hand, it is required to be sintered at a lower temperature to avoid accidents caused by the drainage sand floating up when adding molten steel. thick, otherwise it will affect the automatic pouring rate, thereby affecting the normal smelting operation. [0003] At present, drainage sand made of chromium, silicon or magnesia is commonly used in China. The siliceous drainage sand is based on quartz sand and mixed with feldspar low-melting material as a sintering agent, but the silica in the quartz sand It will reduce the alkalinity of the tundish covering agent and erode the alkaline lining, which will have an adverse effect on the alkaline metallurgical environment of the tundish; the mag...

AI Technical Summary

Problems solved by technology

[0002] Drainage sand is used as the filling material for the nozzle at the bottom of the ladle. On the one hand, it is required to be sintered at a lower temperature to avoid accidents caused by the drainage sand floating up when adding molten steel. thick, otherwise it will affect the automatic pouring rate, thereby affecting the normal smelting operation

[0003] At present, drainage sand made of chromium, silicon or magnesia is commonly used in China. The siliceous drainage sand is based on quartz sand and mixed with feldspar low-melting material as a sintering agent, but the silica in the quartz sand It will reduce the alkalinity of the tundish covering agent and erode the alkaline lining, which will have an adverse effect on the alkaline metallurgical environment of the tundish; the magnesia drainage sand is made of forsterite and magnesia as the main raw materials, which is weakly alkaline, which is beneficial The tundish is formed in an alkaline environment, but its sintering performance is difficult to control; chrome drainage sand has a good drainage effect, but the sintered layer is unstable, and it is easy to see steel infiltration. When molten steel penetrates into the drainage sand, a mixed layer of steel and sand is formed, which is very difficult. It is difficult to realize self-opening, and in severe cases, it is even impossible to boil with an oxygen gun, causing a pouring interruption accident; in addition, whether it is silicon drainage sand or magnesia drainage sand, its automatic opening rate for continuous casting ladle is low, generally 85-90% %, it is difficult to meet the needs of automatic diversion under high temperature or long-term refining conditions