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Converter dephosphorization complex slag former and slagging technology

A composite slagging agent and slagging agent technology, applied in the manufacture of converters, etc., can solve the problems of being unable to be absorbed by crops, and achieve the effects of reducing the erosion of furnace lining refractory materials, high dephosphorization efficiency, and large phosphorus capacity

Inactive Publication Date: 2009-09-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in order to use the high-phosphorus slag produced in the smelting of high-phosphorus molten iron as steel slag phosphate fertilizer, fluorite cannot be added to the dephosphorization agent, because the phosphorus element in the slag will combine with fluorine to form calcium fluorophosphate, which cannot be absorbed by crops

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the components and weight percentages of the converter dephosphorization composite slagging agent are: 34% active lime, 34% rolled steel skin, 15% quartz sand, 11% soda, and 6% fluorite. According to the measured results, the binary alkalinity of the dephosphorization agent is about 1.8, and the hemispherical point temperature is 1231°C. When in use, put 2t of composite slagging agent into the scrap steel trough (accounting for about 1 / 2 of the total slag), and enter the 80t converter together with the scrap steel, and gradually add active lime and slagging agent during the blowing process, and the final slag The binary alkalinity is controlled at 2.5. Implementation effect: The composite slagging agent quickly forms liquid slag with good fluidity, and the subsequent slagging is in good condition, which is conducive to the dissolution of lime.

Embodiment 2

[0038] In this embodiment, the composition and weight percentage of the converter dephosphorization composite slagging agent are: active lime 36%, rolled steel sheet 36%, quartz sand 16%, soda 12%. Fluorite is not added to the dephosphorization agent. According to the measured results, the binary alkalinity of the dephosphorization agent is about 1.9, and the hemispherical point temperature is 1220°C. When in use, put 2t of composite slagging agent into the scrap steel trough (accounting for about 1 / 2 of the total slag), and enter the 80t converter together with the scrap steel, and gradually add active lime and slagging agent during the blowing process, and the final slag The binary alkalinity is controlled at 2.5. Implementation effect: The composite slagging agent quickly forms liquid slag with good fluidity, and the subsequent slagging is in good condition, which is conducive to the dissolution of lime.

Embodiment 3

[0040] In this embodiment, the components and weight percentages of the converter dephosphorization composite slagging agent are: 40% active lime, 30% rolled steel skin, 18% quartz sand, 11% soda, and 1% fluorite. Implementation effect: The composite slagging agent quickly forms liquid slag with good fluidity, and the subsequent slagging is in good condition, which is conducive to the dissolution of lime.

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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...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C5/36
Inventor 谢兵刁江王雨王谦何生平王永红郭戌李晓军
Owner CHONGQING UNIV
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