Converter oxide and nitrogen top-blown dephosphorizing method

A converter, oxygen and nitrogen technology, applied in the manufacture of converters, etc., can solve the problems of unfavorable decarburization furnace heat balance, reduced dephosphorization effect, low carbon content of molten iron, etc., to inhibit the decarburization reaction, improve the gas supply intensity, prevent The effect of slag overflow at the furnace mouth

Inactive Publication Date: 2004-12-08
BAOSHAN IRON & STEEL CO LTD
View PDF1 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) In the case of poor bottom tuyere, the dephosphorization effect is significantly reduced (the dephosphorization rate is less than 65%)
[0008] (2) The amount of decarburization in the dephosphorization process is too large, and the carbon content of the molten iron after dephosphorization is low, which is not conducive to the heat balance in the decarburization furnace

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
  • Converter oxide and nitrogen top-blown dephosphorizing method
  • Converter oxide and nitrogen top-blown dephosphorizing method
  • Converter oxide and nitrogen top-blown dephosphorizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] like figure 2 As shown, the converter oxygen nitrogen top-blowing dephosphorization method described in the present invention uses top-blowing oxygen nitrogen and bottom-blowing nitrogen in the top-bottom double-blowing converter to carry out dephosphorization treatment; wherein, the top-blowing oxygen lance A and the oxygen pipeline 1 and the oxygen branch pipeline 11 are connected; a nitrogen branch pipeline 22 is added at the main pipeline at the inlet of the top-blown oxygen lance A to communicate with the nitrogen pipeline 2, and the gas control valves FCV and 3NV (A ), check valve, etc., through the control circuit 12, the nitrogen branch pipeline 22 and the oxygen branch pipeline 11 are associated with the control, so that the top-blown oxygen lance A has two kinds of gas source control modes. The control and switching of pipeline 1 and nitrogen pipeline 2 are carried out with nitrogen and oxygen mixed blowing or oxygen / nitrogen intermittent blowing.

[0027] re...

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

No PUM Login to view more

Abstract

An oxygen-nitrogen top blowing converter process for desulfurization is carried out by blowing oxygen-nitrogen at its top while blowing nitrogen or inertial gases at its bottom to desulfurise. Its top blowpipe controls oxygen blowing to desulfurise in two modes, with mixed gases at some ratio or with pure oxygen switched with pure nitrogen, in order to inhibit sputtering and to enhance stirring in smelting pool when sputter occurs by excessive oxidation, so that balance of (P)/[P] in dynamics is improved. It desulfurises better when bottom blowing is weak, can inhibit decarbonise reaction effectively with >70% recovery of Mn in molten iron, also, strengthen blowing at top to stir strongly and shorten pre-treat time, increase rate of desulfurization, control slag elimination in procedure effectively to prevent sputtering, and increase stability and security.

Description

technical field [0001] The invention belongs to the technical field of converter metallurgy, and mainly relates to molten iron pretreatment. Background technique [0002] In recent years, the demand for high-grade steel, especially low-phosphorus steel, has greatly increased, which has strongly promoted the adoption and rapid development of the "three-stripping" pretreatment process for molten iron. The current development trend of the world's iron and steel industry is: on the basis of high continuous casting ratio, the steelmaking process technology focuses on the development of segmented steelmaking, that is, the formation of pre-desiliconization in the blast furnace casting house - pretreatment of molten iron to remove P, S - converter top and bottom combined blowing - outside the furnace Refining - the optimal process for continuous casting. [0003] According to the different containers used, dephosphorization of molten iron can be divided into two categories: one is ...

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 Applications(China)
IPC IPC(8): C21C5/28C21C7/064C21C7/072
Inventor 康复钟志敏沈志浩孙兴洪许春雷白松涛李存林吴亚明陈兆平
Owner BAOSHAN IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap