Efficient dephosphorization method of combined blown converter

A converter and high-efficiency technology, applied in the direction of manufacturing converters and improving process efficiency, can solve problems such as poor production organization, explosive splashing, and easy splashing, so as to improve the dephosphorization effect, improve production efficiency, The effect of shortening the smelting time

Active Publication Date: 2014-12-31
LAIWU STEEL YINSHAN SECTION CO LTD
View PDF3 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this operation: after the slag is left, safety problems such as splashing are likely to occur when the molten iron is lowered into the furnace, and accidents such as explosive splashing are prone to occur due to the large amount of slag after the blowing is started
The dephosphorization rate of this process is as high as 95%, but the production is not well organized, and improper operation will seriously corrode the furnace lining

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
  • Efficient dephosphorization method of combined blown converter
  • Efficient dephosphorization method of combined blown converter
  • Efficient dephosphorization method of combined blown converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The converter is a 150-ton top-bottom combined blowing converter.

[0050] A method for high-efficiency dephosphorization of a combined blowing converter, comprising the following steps:

[0051] Prepare slag-making materials, calculated per ton of molten steel: active lime, dolomite, sinter and slag adjustment agent;

[0052] The added amount of active lime is 46kg / t;

[0053] The dolomite addition is 15kg / t;

[0054] The sinter addition amount is 30kg / t;

[0055] The slag adjusting agent is granular steel, and the addition amount of granular steel is 5kg / t; wherein the main component of granular steel is iron-containing oxide, which is obtained by screening and magnetic separation of converter splash slag, and the granular steel contains iron oxide The rate is 27-30%;

[0056] The concrete steps of the method for the efficient dephosphorization of the reblown converter are as follows:

[0057] (1) According to the existing technology, according to the silicon conte...

Embodiment 2

[0081] According to the method of a kind of complex blowing converter high-efficiency dephosphorization described in Example 1, the difference is that in step (4) the position of the oxygen-reducing lance is fixed to 1550mm, all the remaining active lime is added, and the opening of the oxygen lance nozzle blows oxygen The pressure is controlled at 0.83-0.85 Mpa; after blowing for 7 minutes, the remaining sinter and granular steel will be added to molten iron in batches at intervals: the amount of sinter and granular steel added in each batch is 4.0kg / t and 3.2kg / t respectively , feeding interval 40 ~ 60s.

Embodiment 3

[0083] The converter is a 120-ton top-bottom combined blowing converter.

[0084] A method for high-efficiency dephosphorization of a combined blowing converter, comprising the following steps:

[0085] Prepare slag-making materials, calculated per ton of molten steel: active lime, dolomite, sinter and slag adjustment agent;

[0086] The active lime addition 55kg / t;

[0087] The dolomite addition is 17kg / t;

[0088] The sinter addition is 40kg / t;

[0089] The slag adjusting agent is granular steel, and the addition amount of granular steel is 10kg / t; wherein the main component of granular steel is iron-containing oxide, which is obtained by screening and magnetic separation of converter splash slag, and the granular steel contains iron oxide The rate is 27-30%;

[0090] The concrete steps of the method for the efficient dephosphorization of the reblown converter are as follows:

[0091] (1) According to the existing technology, according to the silicon content in the molt...

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

The invention relates to an efficient dephosphorization method of a combined blown converter. The method comprises the steps of: subjecting molten iron to desulphurization, and adding determined scrap steel cold material to the desulfurized molten iron; adjusting the position of an oxygen lance and open blowing parameters; adding a first batch of material, thoroughly melting, lowering the position of the oxygen lance by lowering the position of the spray nozzle of oxygen lance by 40-50 mm every 20-30 s, and adding 2.14-4.44 kg / t of active lime every time before lowering the position of the spray nozzle of the oxygen lance; lowering the position of the oxygen lance to 1500-1600 mm, fixing, adding all the residual active lime and controlling the open blowing oxygen pressure of the spray nozzle of the oxygen lance at 0.83-0.85 Mpa; converting 6-8 min, adding the remaining sinter and grain steel in molten iron by batches under addition amount of the sinter and grain steel of 3.0-6.22 kg / t respectively each batch and feeding interval of 35-60 s, adding all the sinter and grain steel; continuing converting for 3-5min, using a sublance TSC probe to measure temperature of the hot metal and sampling, after measurement of carbon temperature by the sublance TSC probe, adjusting the oxygen pressure of the oxygen lance to 0.83-0.85 Mpa, continuing lowering the position of the oxygen lance to 1200mm until the end of the blowing, and hoisting the oxygen lance; and tapping.

Description

technical field [0001] The invention relates to a method for high-efficiency dephosphorization of a reblowing converter, which belongs to the technical field of converter steelmaking in the iron and steel metallurgy industry. Background technique [0002] In recent years, with the low-phosphorus iron ore on the verge of depletion, the mining and smelting of high-phosphorus iron ore has gradually been put on the agenda. The use of high-phosphorus ore in blast furnaces results in high phosphorus content in molten iron. The traditional converter smelting method cannot meet production needs. , resulting in a large amount of molten steel with high phosphorus, which has a serious impact on the quality and cost of molten steel. [0003] At present, three methods are generally used for smelting high-phosphorus molten iron in converters: [0004] One is to adopt the slag-retaining operation. The slag-retaining operation of the converter is to leave all or part of the final slag form...

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): C21C5/35C21C5/36
CPCY02P10/20
Inventor 王忠刚郭伟达刘忠建张伟段朋朋朱天奇赵立峰
Owner LAIWU STEEL YINSHAN SECTION 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