Complex deoxidizer for steelmaking and preparation method thereof

Abstract

The invention discloses a complex deoxidizer for steelmaking, which comprises the following components in percentage by weight: 5 to 9 percent of calcium (Ca), 10 to 24 percent of silicon (Si), 12 to 19 percent of manganese (Mn) and the balance of Fe, accompanying elements of Al and Mg, and inevitable impurities. The invention also discloses a method for preparing the complex deoxidizer for steelmaking, and the complex deoxidizer is prepared from the following raw materials in proportion (in percentage by weight): 60 to 70 percent of raw manganese ore in which Mn accounts for more than or equal to 32 percent, 12 to 16 percent of silica with the silicon content more than or equal to 98 percent, 10 to 16 percent of lime with the CaO content more than or equal to 90 percent and 5 to 8 percent of iron scale with Fe oxide content more than or equal to 75 percent. The complex deoxidizer and the preparation method have the advantages of low cost of the raw materials, low energy consumption of unit product, reasonable proportion of alloying elements, no segregation, strong substitution and high strength of product, high density and low smelting point of alloy, easy absorption for alloyingelements in molten steel, good deoxidation, desulfurization and dephosphorization effects, and high metal yield.

Description

technical field [0001] The invention relates to a deoxidizer and a preparation method thereof, in particular to a composite deoxidizer for steelmaking and a preparation method thereof, belonging to the field of iron and steel smelting. Background technique [0002] Ferroalloy is one of the indispensable raw materials for the steel industry and machinery industry. With the continuous development of my country's iron and steel industry, the increase of steel varieties and the improvement of steel quality have put forward higher requirements for ferroalloy production, and ferroalloy production technology has increasingly become a related technology and supporting project for the iron and steel industry. [0003] Although my country's ferroalloy industry has experienced 50 years of rapid development and has achieved world-renowned achievements, it is known as a major producer of ferroalloys, but this is only in terms of my country's "production scale". If compared with the worl...

AI Technical Summary

Problems solved by technology

[0006] (3) The production process of refined products such as manganese series and chromium series is still dominated by the traditional "electric silicothermal method", and the thermal mixing method (Pollen method) and out-of-furnace refining technology are not yet common

[0007] (4) The application of electronic computers in production process control is still in its infancy

[0008] (5) High energy consumption per unit product: In 2007, the national average energy consumption of ferroalloys was 3.46 tons of standard coal, of which national key enterprises consumed 2.56 tons of standard coal, and local enterprises consumed 4.22 tons of standard coal

[0009] (6) The product structure is unreasonable and there are few high-end products: At present, although the bulk varieties of silicon, manganese, and chromium series of ferroalloys in my country are basically similar to those in foreign countries, the purity products, nitriding products, and refined products outside the furnace are used as composite deoxidizers. There are few high-efficiency brands such as desulfurization agent, dephosphorization agent, inoculant, multi-component alloy agent, and granulated powder products, which do not meet market demand.

[0010] (7) At present, in some domestic multi-component composite alloy products, such as silicon-calcium-manganese alloy produced by a certain factory, due to problems in the production process, the element segregation of the product is serious, which affects its use effect

[0014] C: Lower the tapping temperature, cause temperature drop, and easily cause nodulation of continuous casting molten steel;

[0015] D: Increase the labor intensity of workers at the post