Method for using red mud as ladle or tundish covering agent

Abstract

The invention discloses a method for using red mud as a ladle covering agent, which obtains a ladle or a tundish coating agent by carrying out magnetic separation to the red mud to remove the Fe2O3 and TiO2 in the red mud. The invention proposes a completely new concept for using the red mud, which namely removes ineffective components at first, and then fully uses all the rest effective components; the effective operating factor can achieve more than 85 percent. The method for using red mud as the ladle covering agent solves the application of the waste-red mud generated during the process of an alumina production enterprise to extract the alumina by bauxite mines, uses the waste as the ladle covering agent, not only has low cost, but also solves the pollution discharge problem of an alumina factory; more important, the method for using red mud as the ladle covering agent protects the environment and saves resources.

Description

technical field

[0001] The invention belongs to refractory materials, and in particular relates to a covering agent for a ladle or a tundish in the steelmaking process. Background technique

[0002] At present, the covering agents for ladles and tundishes are prepared by pre-melting ore or raw meal and clinker. As disclosed in the patent 02111900, the tundish covering agent for pure steel and its manufacturing method is to utilize pre-melted clinker and raw materials to mix and form. The consumption of raw material and clinker is large and the cost is high.

[0003] Red mud is the waste produced during the extraction of alumina from bauxite ore. According to statistics, the production of 1 ton of aluminum requires about 2 tons of alumina, and the production of 1 ton of alumina requires 1 to 1.8 tons of red mud. In 2006, the national alumina output was about 10 million tons, and the annual discharge of red mud should be more than 15 million tons. Adding the cumulative accu...