Converter dephosphorization complex slag former and slagging technology

Abstract

The present invention discloses a converter dephosphorization complex slag former that includes constituents with percentages by weight below: 30 to 40% of active lime; 30 to 40% of rolled steel sheet iron; 13 to 18% of quartz sand; 11 to 13% of soda; and 0 to 6% of fluorite; said raw materials are smashed into powder, mixed uniformly, sieved and palletized to obtain the complex slag former. The complex slag former is advanced with low melting point, fast slag forming, uniform constituent, stable property, big phosphorus capacity and high dephophorization efficiency of a dephosphorizer, for application in converter dephosphorization with hot metal with higher phosphorus content; the complex slag former is provided with good slagging situation, low alkalinity of final slag after dephosphorization, low content of free calcium oxide; the complex slag former has low content of fluorite, to thereby reduce lining refractory material erosion; the fluorine-free high phosphorus slag can be used as a steel slag phosphate fertilizer when smelting high phosphorus liquid iron.

Description

technical field

[0001] The invention relates to a dephosphorization agent for pretreatment of molten iron in the iron and steel metallurgy industry, in particular to a composite slagging agent and a slagging process for dephosphorization in double-connected converter or MURC smelting and medium-high phosphorus molten iron smelting. Background technique

[0002] Since the early 1980s, when Japan successfully developed ladle and torpedo car pretreatment dephosphorization technology and was quickly adopted by major iron and steel enterprises, the traditional steelmaking process has undergone significant changes. Dephosphorization is carried out in the molten iron pretreatment stage that can provide better reaction conditions, and the main function of the converter evolves to the direction of simple heating and decarburization reactors, resulting in increased production efficiency, reduced consumption, and reduced slag. And make it possible to produce clean steel with high effic...