Molten iron demanganizing agent for silicon steel and manufacturing method thereof

Abstract

The invention relates to a molten iron demanganizing agent for silicon steel and a manufacturing method thereof. The molten iron demanganizing agent for the silicon steel comprises the following chemical components in percentage by weight: 73.8 to 89.3 percent of Fe2O3, less than 1 percent of FeO, less than 5 percent of SiO2, 3.4 to 9.5 percent of CaO, 0.5 to 1 percent of fluidizer, and the balance of impurities. The method for manufacturing the molten iron demanganizing agent for the silicon steel comprises: in percentage by weight, mixing and grinding iron core powder, burnt lime and the fluidizer according to a proportion of 90-95:4-9.5:0.5-1, wherein the mean particle size of the mixture is less than 1 millimeter; the iron core powder contains 82 to 94 percent of the Fe2O3 and less than 1 percent of FeO; the burnt lime contains more than or equal to 85 percent of CaO; and the fluidizer is methyl silicone oil. The molten iron demanganizing agent for the silicon steel has the characteristics of high demanganizing efficiency, no impurity generated by molten iron, lower unit consumption, safe and convenient use, stable and reliable performance, and the like.

Description

A kind of molten iron manganese removal agent for silicon steel and its manufacturing method technical field The invention relates to a molten iron demanganese agent for silicon steel and a manufacturing method thereof. Background technique Smelting different types of steel has different requirements on the composition of molten iron. For the manganese content in molten iron, when smelting ordinary carbon steel, the manganese content in blast furnace hot metal is required to be greater than 0.25%, and when smelting oriented silicon steel (such as CGO), the manganese content in hot metal is required The content is less than 0.15%. At present, the manganese content of blast furnace molten iron is 0.30% to 0.40%. To reduce the manganese content of blast furnace molten iron, the manganese content of the furnace charge can be reduced by changing the ore mix structure. However, for large blast furnaces with high annual output, only a small part of molten iron needs low manganes...

AI Technical Summary

Problems solved by technology

At present, the desiliconization of hot metal in front of blast furnace is to use the blowing tank, with compressed air as the carrier, to spray the dust removal powder into the swing nozzle, and flow into the molten iron tank together with the molten iron. The state of the tank and the size of the iron flow are limited. The spray speed of the dust removal powder is 200kg / min~300kg / min, and the effective oxygen content is low. From the production data in recent years, the dust removal powder can meet the desiliconization requirements, and the qualified rate of desilication ( After desiliconization, the manganese content in molten iron is less than 0.20%) can reach 90%, and the desiliconization efficiency can reach more than 60%, but the demanganization efficiency is only about 30%, which is far from meeting the actual needs of silicon steel for manganese content in molten iron