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Method for simultaneous desulfurization and dephosphorization of desulfurization and dephosphorization agent and semi-steel

A technology of sulfur dephosphorization agent and dephosphorization agent, applied in the field of desulfurization and dephosphorization agent, can solve the problems of small environmental pollution, short treatment time of molten iron, and large environmental pollution

Active Publication Date: 2016-07-13
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of the existing semi-steel desulfurization and dephosphorization technologies, such as long processing time of molten iron, high temperature, large environmental pollution and high cost, and to provide a short processing time for molten iron, A desulfurization and dephosphorization agent with low temperature, low environmental pollution and low cost, and a method for simultaneously desulfurizing and dephosphorizing semi-steel using the desulfurization and dephosphorization agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment is used to illustrate the desulfurization and dephosphorization agent provided by the present invention and the method for simultaneous desulfurization and dephosphorization of semi-steel.

[0039] The desulfurization and dephosphorization agent of the present invention of 7.5 kg / ton of semi-steel is blown into 140 tons of semi-steel 1 with an initial temperature of 1375° C. at a rate of 50 kg / min by means of semi-steel injection. The desulfurization and dephosphorization agent is composed of 100 parts by weight of lime (CaO content is 90% by weight), 18.8 parts by weight of sodium carbonate and 6.3 parts by weight of calcium carbonate. In addition, the particle size in the desulfurization and dephosphorization is not more than 1 mm, and the proportion of not less than 0.1 mm is 85% by weight.

[0040] The semi-steel was simultaneously desulfurized and dephosphorized at an initial temperature of 1375°C for 21 minutes. After the desulfurization and dephosphor...

Embodiment 2

[0042] This embodiment is used to illustrate the desulfurization and dephosphorization agent provided by the present invention and the method for simultaneous desulfurization and dephosphorization of semi-steel.

[0043] The desulfurization and dephosphorization agent of the present invention of 6.5 kg / ton of semi-steel is blown into 140 tons of semi-steel 2 with an initial temperature of 1355° C. at a rate of 40 kg / min by means of half-steel injection. The desulfurization and dephosphorization agent contains 100 parts by weight of lime (CaO content is 89% by weight), 11.5 parts by weight of sodium carbonate, and 5.5 parts by weight of calcium carbonate. In addition, the particle size in the desulfurization and dephosphorization is not more than 1 mm, and the proportion of not less than 0.1 mm is 88% by weight.

[0044] The semi-steel was subjected to simultaneous desulfurization and dephosphorization for 18.2 minutes at an initial temperature of 1350°C. After desulfurization and ...

Embodiment 3

[0046] This embodiment is used to illustrate the desulfurization and dephosphorization agent provided by the present invention and the method for simultaneous desulfurization and dephosphorization of semi-steel.

[0047] The desulfurization and dephosphorization agent of the present invention of 5.5 kg / ton of semi-steel is blown into 140 tons of semi-steel 3 with an initial temperature of 1315° C. at a rate of 60 kg / min by means of semi-steel injection. The desulfurization and dephosphorization agent contains 100 parts by weight of lime (CaO content is 92% by weight), 20 parts by weight of sodium carbonate, and 13.5 parts by weight of calcium carbonate. In addition, the particle size in the desulfurization and dephosphorization is not more than 1 mm, and the proportion of not less than 0.1 mm is 91% by weight.

[0048] The semi-steel was simultaneously desulfurized and dephosphorized for 15.4 minutes at an initial temperature of 1315°C. After the desulfurization and dephosphorizat...

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Abstract

The invention discloses a desulfurization and dephosphorization agent, wherein the desulfurization and dephosphorization agent contains lime and sodium salt; relative to 100 parts by weight of lime, the content of the sodium salt is 5-30 parts by weight. The invention also discloses a method for simultaneous desulfurization and dephosphorization of semi-steel, the method comprising: adding a desulfurization and dephosphorization agent to the molten semi-steel for desulfurization and dephosphorization, wherein the desulfurization and dephosphorization agent is the above-mentioned desulfurization and dephosphorization agent. Through the above technical proposal, the treatment time for desulfurization and dephosphorization of semi-steel is shortened, the temperature of semi-steel will be lower after the treatment, the total feeding amount is saved, and the pollution to the environment is reduced. In addition, since dephosphorization is carried out at the same time as desulfurization, additional equipment investment is no longer required, and operation steps and treatment costs are saved.

Description

Technical field [0001] The invention relates to a desulfurization and dephosphorization agent and a method for simultaneous desulfurization and dephosphorization of semi-steel. Background technique [0002] With the development of the steel industry, the quality requirements for steel are getting higher and higher. Sulfur and phosphorus are the most important harmful impurity elements in steel, which will greatly reduce the performance of steel. Therefore, the demand for low-sulfur and low-phosphorus steel is increasing. [0003] At present, in advanced iron and steel industry countries, especially Japan, a lot of research on hot metal pretreatment technology has been carried out, and the technology is mature. Advanced steel plants in my country, such as Baosteel and Wuhan Iron and Steel, have also applied hot metal pretreatment technology, and their desulfurization process has basically matured. [0004] Since 1980, various treatment methods have been developed to deal with the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C1/02C22C38/14
Inventor 曾建华梁新腾陈永李扬洲杨森祥戈文荪陈炼龚洪君喻林陈均陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP