Slab continuous casting mold covering slag and production method thereof

Abstract

The invention discloses slab continuous casting mold covering slag, which comprises the following chemical components in percentage by mass (wt percent): 25-40 percent of SiO2, 0.1-10 percent of MgO, 21-41 percent of CaO, 0.2-2.5 percent of Fe2O3, 2.5-14 percent of Al2O3, 3-14 percent of Na2O, 2.5-10 percent of F, 0-1.5 percent of Li2O, 0-6 percent of MnO, 0.5-10 percent of volatile matter and 1-11 percent of Cfixed. A cheap electrolytic aluminum waste residue raw material is effectively added into the slab continuous casting mold covering slag formula for use, wherein the chemical elements of fluorine, carbon, sodium, aluminum and the like can be used for substituting or partially substituting one or more of raw materials of the chemical elements used in the continuous casting mold covering slag formula, and the quality performance of a product can reach and meet enterprise standard. In actual production, the skilled worker in the art tries to reduce the cost in various aspects; but since the covering slag production field is far different from the electrolytic aluminum production field, improvement cannot be performed in the electrolytic aluminum waste residue and the electrolytic aluminum waste residue cannot be changed into things of value.

Description

technical field [0001] The invention belongs to the technical field of steelmaking auxiliary materials, and in particular relates to a slab continuous casting mold mold powder 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 pushed to a...

AI Technical Summary

Problems solved by technology

[0004] The waste slag produced 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.