Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pretreatment method of molten iron

A technology of pretreatment and molten iron, applied in the direction of manufacturing converters, etc., can solve the problems of low microwave reflectivity, inability to detect slag level, difficult to measure, etc., to achieve the effect of suppressing bump outflow

Active Publication Date: 2017-09-22
JFE STEEL CORP
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for desiliconization slag with low electrical conductivity, the reflectivity of microwaves is very small and most of them pass through, so there are also reflected waves from the molten iron bath surface and multiple reflected waves on the molten iron bath surface and the slag surface, so The method of Patent Document 4 cannot detect the slag level
[0013] In addition, in Patent Document 5, an antenna for transmission and reception is inserted into a furnace, and in a refining furnace exposed to high-temperature slag and molten iron droplets, these droplets adhere to and solidify on the On the antenna, it is difficult to measure continuously during the refining period

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pretreatment method of molten iron
  • Pretreatment method of molten iron
  • Pretreatment method of molten iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0125] use figure 1 The shown converter-type refining furnace with a capacity of 330 tons has implemented the molten iron pretreatment of the present invention (Examples 1 to 3 of the present invention) and the molten iron of the conventional method of measuring the slag height through the slag level of the microwave oven but not controlling the slag height Pretreatment (Comparative Example 1, Comparative Example 2) was performed 20 times each. The target value of phosphorus concentration in molten iron at the end of the pretreatment was all set to 0.030% by mass.

[0126] In Example 1 of the present invention, a microwave oven slag level gauge is used to measure the slag height in oxygen blowing in the desiliconization treatment, and at least one of the oxygen feeding speed from the top blowing lance, the height of the lance, and the gas flow rate for stirring is measured. Adjust the ratio of the measured slag height to the height of the melting chamber in the furnace so tha...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The present invention relates to a method for pretreatment of molten iron, which uses a single converter type refining furnace to continuously perform desiliconization and dephosphorization of molten iron with an intermediate slagging process, in which a sufficient amount of The slag is quickly discharged out of the furnace, and sufficient dephosphorization treatment can be performed in terms of cost and quality. The pretreatment method of the present invention includes: a desiliconization treatment process, supplying a gaseous oxygen source to the molten iron (5) in the converter type refining furnace (1) from a top blowing lance (2) to desiliconize the molten iron; a slagging process, At least a part of the slag generated in the desiliconization process is discharged from the converter type refining furnace; in the dephosphorization process, after the slagging process, a CaO-based flux is added to the converter type refining furnace, and a gaseous oxygen source is supplied from the top blowing lance , dephosphorize the remaining molten iron, wherein, in the desiliconization process, the slag height in the furnace is measured, and the measured slag height is defined by the distance from the molten iron bath surface in the furnace to the furnace mouth The desiliconization process is completed in a state where the height ratio of the melting chamber in the furnace is in a predetermined range.

Description

technical field [0001] The present invention relates to a pretreatment method of molten iron in which desiliconization and dephosphorization of molten iron are continuously performed using a converter type refining furnace, and an intermediate slagging process is interposed between the desiliconization and dephosphorization. Background technique [0002] In recent years, the development of pretreatment technology for molten iron using a converter-type refining furnace has progressed, and the following pretreatment methods have been developed. That is, a refining method has been developed in which, after desiliconization of molten iron in a converter-type refining furnace, the converter-type refining furnace is tilted and the slag in the furnace (the slag generated by the desiliconization process is referred to as "desiliconization slag") has been developed. ") at least part of it is discharged, and then CaO-based flux is thrown into the furnace to dephosphorize the remaining...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/04C21C1/02C21C5/28C21C5/46
CPCC21C1/02C21C1/04C21C5/28C21C5/35
Inventor 小笠原泰志内田佑一三木佑司伊藤友彦手塚浩一田中高太郎根岸秀光川畑涼山本和人奥山悟郎
Owner JFE STEEL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products