Preprocessing agent for molten iron and method for preparing same

Abstract

The invention relates to a production process using red mud as hot-metal preparation compound. The technical project is that mix equably the dried red mud with Fe2O3, CaO, Na2CO3, MnO2, CaCl2, SiO2 or other smeltery wastes that contain these compositions. The mass fraction of the mixture is: red mud being15 to 30 percent, Fe2O3 being 38 to 45 percent, CaO being 25 to 40 percent, Na2CO3 equal to or less than 5 percent, CaCl2 equal to or less than 5 percent, SiO2 equal to or less than 10 percent, and CaO / SiO2 being 3.0 to 7.0. The mass fraction of main chemical constituent in red mud is: SiO2 equal to or less than 25 percent, Fe2O3 equal to or more than 20 percent or CaO equal to or more than 40 percent. The invention with red mud as raw material has a characteristic of resource recovery, cleaning production, protecting environment, low cost, and no needing of changing the present equipment and operation.

Description

1. Technical Field [0001] The invention belongs to a production method of a hot metal pretreatment agent. In particular, it relates to a production method using red mud as a pretreatment agent for molten iron. 2. Background technology [0002] Red mud is the waste produced in the process of extracting alumina from bauxite ore. At present, the world produces more than 60 million tons of red mud every year. In 2003, the domestic alumina output was about 5.5 million tons, and the annual amount of red mud discharged should be more than 6 million tons. Together with the accumulated accumulation over the years, the amount is quite considerable. A large amount of red mud will not only occupy good land, but also free alkali and other harmful components will also pollute the environment. Alumina plants generally use flat ground to build platforms, river valley dams, recessed land filling and other methods to pile up red mud. Because no protective measures are taken, the red mud waste liqu...

AI Technical Summary

Problems solved by technology

At present, hot metal pretreatment is mainly carried out in torpedo cars or ladles, and the pretreatment agent used is artificially synthesized flux (Yang Yindong, Bi Xuegong, Hou Jian, etc. Utilize aluminum industry waste slag and by-products to produce steel industry refining synthetic slag. Steel, Vol .38, No.10, 2003, (Supplement), 208-212), but did not use red mud as raw material