Granular heat-preserving covering flux for hot metal in steelmaking

Abstract

The invention discloses a granular heat-preserving covering flux for hot metal in steelmaking, and relates to a treatment agent added into a ladle for preserving heat on the surface of hot metal for steelmaking. The granular heat-preserving covering flux is characterized in that: the heat-preserving covering flux is prepared from expanded vermiculite, wollastonite, bauxite, iron ore concentrate and coke powder, and comprises the following components in percentage by weight: 30 to 35 percent of SiO2, 15 to 21 percent of (CaO+MgO), 7 to 12 percent of Al2O3, 3 to 5 percent of Fe2O3, 15 to 20 percent of C, and the balance of impurities; and the raw materials are ground, sieved, mixed, mixed and stirred, dried, cooled, and weighed and packaged at normal temperature and normal pressure. The granular heat-preserving covering flux has the advantages that: the granular heat-preserving covering flux has good slagability and spreadability, is conveniently adsorbed by inclusion, contains a heat-generating agent and an oxygen supplying agent so as to facilitate melting per se and reduce iron sticking and ladle sticking; the expanded vermiculite and the wollastonite regulate components of the heat-preserving covering flux, and have expanding and heat insulating functions, and good heat preservation property; the MgO regulates the alkalinity and reduces the adhesion of the heat-preserving covering flux with a ladle lining so as to facilitate cleaning slag in the ladle; and the heat-preserving covering flux is granular and greatly reduces dust pollution.

Description

technical field [0001] The invention belongs to the treatment of molten iron alloys, and in particular relates to a treatment agent added to the surface of molten steel in a ladle for heat preservation. Background technique [0002] During the process of transporting molten iron and steel from the iron factory to the steel factory and waiting to be released after arriving at the steel factory, the temperature drop is relatively significant, and the temperature of the molten iron fluctuates relatively greatly, which not only wastes a lot of heat energy, but also brings a certain influence. For this reason, attention has been paid to the research and development of thermal insulation agents for molten steelmaking. [0003] At present, carbonized rice husks are mainly used as thermal insulation agents for molten iron. The disadvantages of using carbonized rice husks for heat preservation are: a large amount of smoke pollutes the air during the production process of carbonized ...

AI Technical Summary

Problems solved by technology

[0003] At present, carbonized rice husks are mainly used as thermal insulation agents for molten iron. The disadvantages of using carbonized rice husks for heat preservation are: a large amount of smoke pollutes the air during the production process of carbonized rice husks; Liquid slag layer; poor spreadability, only 60% to 70% of the spreading surface, and 30% to 40% of the molten iron surface is exposed in the air, and the heat preservation effect is poor; it does not have the metallurgical function of absorbing floating inclusions in molten steel; use It is easy to generate flying dust when carbonizing rice husk

Therefore, carbonized rice husks cannot meet the requirements of modern steelmaking production processes with continuous improvement in variety quality

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