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High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer

A desulfurizer and high basicity technology, applied in the field of steelmaking, can solve the problems of inability to achieve rapid melting of the desulfurizer, reduce the optical basicity of the desulfurizer, and intensify the erosion of refractory materials, so as to improve the reaction kinetic conditions and improve the optical alkalinity. degree, the effect of promoting rapid melting

Inactive Publication Date: 2011-05-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the desulfurization process, fluoride does not directly participate in the desulfurization reaction, but only acts as a flux to reduce the viscosity of the desulfurizer, improve its fluidity, increase the interface reaction speed between slag and steel, but the fluoride content increases , the erosion of refractory materials by desulfurizers is intensified, and problems such as environmental pollution
[0004] CaO-Al 2 o 3 -SiO 2 The slag system is the most researched fluorine-free RH desulfurizer slag system, which can effectively reduce the melting point of the desulfurizer. However, due to Al 2 o 3 The addition of the desulfurizer reduces the optical basicity of the desulfurizer, and the modified slag system cannot realize the rapid melting of the desulfurizer, so it is necessary to add other components on the basis of this slag system to meet the thermodynamic and kinetic conditions of the desulfurizer for RH

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0016] 55 grams of CaO, 16 grams of Al 2 o 3 , 10 g BaO, 7 g MgO, 4 g B 2 o 3 , 4 g SiO 2 . After mixing evenly with a mixer, put it into a graphite crucible, heat it up to 1550°C in an induction furnace and keep it warm for 30 minutes, and stir it with a molybdenum rod when keeping it warm for 10 minutes, 18 minutes and 25 minutes respectively, so that the components are melted and mixed evenly. After the molten desulfurizer is cooled, mash it, which is the high-alkalinity fluorine-free RH desulfurizer invented in this experiment.

[0017] The melting point of the desulfurizer measured by the hemispherical point method is 1380°C, and the optical basicity is 0.83.

Embodiment example 2

[0022] In a large-scale iron and steel enterprise, the electric light steel was used as the experimental steel type, the RH desulfurizer of the present invention was used, and the vacuum chamber of the desulfurizer was put into the process. The amount of desulfurizer added was 3Kg / t steel, and the desulfurization test was carried out. The data obtained from the test shows that: using the RH desulfurizer of the present invention, the RH desulfurization process can reach a reaction equilibrium in 8 minutes; the average RH desulfurization rate can reach 38%; the average service life of the RH immersion tube is 86 furnaces.

comparative example 2

[0024] The same RH equipment is used in the same enterprise as in Case 2, and the pipeline steel is also used as the test steel. The traditional RH desulfurizer with a mass percentage of CaO of 60% and a mass percentage of fluoride of 40% is used. The room is put into the process, and the amount of desulfurizer added is 3Kg / t steel, and the desulfurization test is carried out. The data obtained from the test show that the reaction equilibrium can be reached in 12 minutes by using the traditional desulfurizer RH desulfurization process; the temperature drop of molten steel RH desulfurization treatment is 29°C; the average RH desulfurization rate can reach 27%; the average life of the RH immersion tube is 42 furnaces.

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Abstract

The invention discloses a high basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer, belonging to the technical field of steelmaking. The high basicity fluorine-free RH desulfurizer is characterized in that with a CaO-Al2O3-SiO2 slag system as a basic slag system, BaO is added to lower a melting point of the desulfurizer and enhance the optical basicity of the desulfurizer to reach 0.83; B2O3 is added to lower the melting point of the desulfurizer and enhance the melting speed of the desulfurizer, and therefore, under the flurorine-free condition, the desulfurizer can be rapidly molten without lowering the optical basicity of the RH desulfurizer; and fluoride which seriously influence the environment and seriously erodes equipment is not contained in a formula, thereby the corrosivity of the desulfurizer is reduced and the service life of the RH equipment is prolonged without the addition of the fluoride. Accordingly, the contradiction among high optical basicity, low melting point and rapid melting speed of the RH desulfurizer under the fluorine-free condition is solved and the efficiency of RH refinement to feeble deoxidized steel desulfurization treatment is enhanced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and is a high-alkalinity fluorine-free RH desulfurizer. Background technique [0002] In the RH desulfurization process, it is necessary for the desulfurizer to have a high optical basicity to ensure that the desulfurizer has a good desulfurization ability under thermodynamic conditions. At the same time, it is required that the desulfurizer has a low melting point and can melt quickly to meet the dynamic conditions for achieving a better desulfurization effect. At present, the desulfurizers used in the RH refining process are mostly CaO-fluoride desulfurizers, which have the advantages of high sulfur capacity and good desulfurization thermodynamic conditions. However, in actual production, using the input method, the desulfurization effect is poor when using this desulfurizer to desulfurize weakly deoxidized steel; and the desulfurizer seriously corrodes the dip tube, reducing the service li...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 王华孟华王建军
Owner KUNMING UNIV OF SCI & TECH
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