Composite desulfurizer

Abstract

The invention discloses a high-efficiency compound desulfurizing agent, relating to the ladle desulphurization accessory field. In the existing ladle desulphurization, the uniserial desulfurizing agent is uniformly adopted, with narrower function, and non-agreeable desulphurization effect. Aiming at the condition that small and medium-sized steel mills do not have liquid iron pretreatment systemsor desulphurization stations, and do not have powder spraying desulphurization devices, the desulfurizing agent of the invention adopts ingredient with multi-components, namely, the compound desulfurizing agent consisting of limestone, calcined soda, fluorite, calcium carbide, magnesium powder and caustic-calcined magnesite, with the weight proportion of 40 to 50, 10 to 20, 5 to 15, 10 to 20, 4 to6 and 5 to 15 sequentially. The desulfurizing agent has the following advantages that: 1. the integral desulphurization capability is strong, and the sulfur content can be reduced to 20ppm; 2. sulfursubstance can be contained, and resulfurization phenomenon can not be generated; 3. the desulfurizing agent can be directly poured, and equipment and investment are not needed to be increased; and 4.the desulphurization speed is high.

Description

technical field [0001] The invention relates to the field of metallurgical auxiliary materials, in particular to auxiliary materials for desulfurization of steel bins. Background technique [0002] Sulfur is a harmful element in steel. It can cause brittleness of steel. Different types of steel have certain requirements for sulfur content. Desulfurization must be carried out if the content exceeds the standard. Otherwise, steel products with excessive sulfur content are defective and waste products. Therefore , steelmaking process desulfurization is an important process step. Desulfurization in the steelmaking process is divided into hot metal pretreatment desulfurization, ladle desulfurization and refining deep desulfurization. As a desulfurizer, there are lime series, calcium carbide series, magnesium powder series and so on. According to the different original content and the expected content of final desulfurization, determine which desulfurizer to use and what process...

AI Technical Summary

Problems solved by technology

From the point of view of the use effect, the single series of desulfurizers have relatively narrow functions, especially in ladles and refining furnaces. In the case of deep desulfurization and smelting of special steel, due to the certain amount of sulfur contained in metallurgical auxiliary materials and slag, the slag liquid and steel The balance of sulfur in the water moves to the molten steel, resulting in the phenomenon of increasing sulfur instead of desulfurization. In this way, the use of general desulfurizers during desulfurization cannot meet the needs of desulfurization. The process cost of using magnesium powder series is relatively high, and more auxiliary equipment is required.