Protecting slag of round blank continuous-casting crystallizer and production method thereof

Abstract

The invention discloses a protecting slag of a round blank continuous-casting crystallizer, comprising the chemical components in mass percent as follows (wt%): 25-35% of SiO2, 0.1-5% of MgO, 21-31% of CaO, 0.2-3% of Fe2O3, 3.5-11% of Al2O3, 2.5-9% of Na2O, 2.5-7% of F, 0-2% of Li, 0-4% of MnO, 1-10% of volatile matter and 8-22% of fixed C. By effectively adding a cheap electrolytic aluminium slag raw material into a formula of the protecting slag of the round blank continuous-casting crystallizer for use, chemical elements contained in the raw material, such as F, C, Na, Al etc., can replace or partially replace one or more kinds of raw materials of the chemical elements used in the formula of the protecting slag of the round blank continuous-casting crystallizer, and the quality performance of the product can reach and be up to the enterprise standard. In the practical production, a technical worker in the technical field manages to reduce the cost from various aspects; however, as the production field of the protecting slag is quite different from that of electrolytic aluminium, the electrolytic aluminium slag cannot be improved so as to turn waste electrolytic aluminium slag into wealth.

Description

technical field [0001] The invention belongs to the technical field of steelmaking auxiliary materials, and in particular relates to a round billet continuous casting mold mold slag and a production method thereof. technical background [0002] At present, although China's steel production and consumption have maintained a growth trend, the growth rate has slowed down, and the steel production capacity is severely oversupplied; the price of raw materials and fuels is running at a high level, coupled with the impact of the global economic situation, the benefits of the steel industry have been greatly reduced. All iron and steel manufacturers have lowered the cost of various raw materials, as one of the auxiliary materials for steelmaking in the iron and steel industry - continuous casting mold powder is also listed; in addition, the prices of various production raw materials for continuous casting mold powder have risen, and its The competition in the industry has been pushe...

AI Technical Summary

Problems solved by technology

[0007] The waste slag generated in the electrolytic aluminum production process is currently difficult to comprehensively utilize, except for the patent No. 200910064313.2, which is entitled "Method for recovering cryolite from electrolytic aluminum waste slag using fluorine-containing hydrochloric acid" which discloses a method of using fluorine-containing hydrochloric acid to extract cryolite from electrolytic aluminum waste slag. A method for recovering cryolite from aluminum waste slag, using electrolytic aluminum waste slag and fluorine-containing hydrochloric acid as raw materials to react to prepare cryolite products

The advantages of the method provided by the invention are: ① using cheap electrolytic aluminum waste slag and fluorine-containing hydrochloric acid as raw materials to recycle cryolite, and the production cost is low; The fluorine-containing hydrochloric acid solution after the treatment reaction is used to prepare calcium chloride; in theory, it provides a very good method for the treatment of electrolytic aluminum waste residue, but in specific operations, especially the fluorine-containing hydrochloric acid solution is used to prepare chlorine Calcium process also has pollution, and the purity is difficult to guarantee

For the vast majority of electrolytic aluminum waste, it is disposed of by landfill or stacking, which not only causes a serious waste of resources, but also poses a great hazard to safe production and environmental protection due to its high fluorine content.